Riley's CE Coupe 4G94 2.1L Build
- Thread starter Starke02
- Start date
Starke02
Active Member
My dad and I will be working out all the clearances. And by God I have but there's no off the shelf baffled sumps and it'll be another grand at the very least. I dont want to be spending that much more anytime soon so not even gonna be thinking of that until the car is abt to go on track. This engine has already cost me 13k this yr alone...
On stock ecu for now, also I know 9k is definetly possible with a very well built engine, which mine hopefully should be
just some thoughts
I’d personally recommend getting the crankshaft/rotating assembly balanced. Particularly if the rods are no-name. It’s one thing to do a static balance (ensuring all the rods weigh the same) but even trying to keep the weight of the rod even over the crank can be really difficult without the right gear.
With dynamic balance, it’ll account for discrepancies in the crank AND the rods AND the flywheel/clutch. All the vibrations are going to stack up at 9k rpm, might as well give it the best chance you can. Even if it means you ditch the billet flywheel to afford it, I reckon it’ll save the motor long term. It’d be a shame to see all this money sunk and then the poor motor rattles itself another bearing.
Bearing clearance, absolutely can be done it home. Check out JafroMobile on youtube if you havent already, some sweet vids of his 4g63 getting all this kind of work done. (I’m sure there’s technically better videos, but i find him entertaining)
Traditionally you de-stroke a motor to chase a higher rpm limit, so I’m real curious to see how a g94 plays out for you. Like real curious. Pls keep the updates coming haha.
I’d personally recommend getting the crankshaft/rotating assembly balanced. Particularly if the rods are no-name. It’s one thing to do a static balance (ensuring all the rods weigh the same) but even trying to keep the weight of the rod even over the crank can be really difficult without the right gear.
With dynamic balance, it’ll account for discrepancies in the crank AND the rods AND the flywheel/clutch. All the vibrations are going to stack up at 9k rpm, might as well give it the best chance you can. Even if it means you ditch the billet flywheel to afford it, I reckon it’ll save the motor long term. It’d be a shame to see all this money sunk and then the poor motor rattles itself another bearing.
Bearing clearance, absolutely can be done it home. Check out JafroMobile on youtube if you havent already, some sweet vids of his 4g63 getting all this kind of work done. (I’m sure there’s technically better videos, but i find him entertaining)
Traditionally you de-stroke a motor to chase a higher rpm limit, so I’m real curious to see how a g94 plays out for you. Like real curious. Pls keep the updates coming haha.
Starke02
Active Member
Yeah 100% bro, no point wasting money or skimping out on this type of important crap. Nah im already going to get the entire rotating assembly balanced at my local machine shop, but yeah will be doing all the clearmeces at home cause that's one thing I can do I guess. No way in hell am I gonna push high rpms without it all balanced man.
Once I can get a hold of a 94 block and sent to the shop I'll update this thread bc not many have pushed the rpms I want with a 94. 93s r easy to push that high so should be mad to see one reving to the moon
Cleanmin
Active Member
Our prayers have been answered. *poo* to hear about the bearings and cam gear, but the new setup sounds like it will be a true screamer. Hopefully considering you have thrown down the dosh RPW will be quick with their turn around for you man. It's a nice collection of parts, especially fond of the cam and final drive. Super keen bro
Starke02
Active Member
Cheers bro, hopefully these parts can actually handle whatevers given to it
Starke02
Active Member
Gotten a little more done over the last month, and slowly but surely getting closer to it being finished. The build so far is almost 50% done, consisting of removing the head, replacing the old radiator with the new evo one, taking apart the entire 4g94 wrecker engine, sending off the block to be decked and cleaned and bored out for the larger pistons, removing the cam and sending it off to be regrinded into the 284/284 spec, painting the brake calipers and replacing all the rubber boots, painting and heat wrapping the headers.
I bought a 4g94 wrecker engine with unknown kms for $350 which was an absolute steal. I didn't really care about the condition as long as it ran before it was removed then that was fine by me since I would completely restore it.
I sent crank off to be lightened, balanced, possibly knife edged, checking the journals to see what bearings i can use, possible cross drilling the oil gallery's, refacing the main and big end of the crank.
The block i sent off to be cleaned, crack tested, decked, cylinder boring and possibly tunnel bored if it isn't true enough.
I'm about 80% finished with my headlight intake and cai box. Still got to cut a hole into the box for the pipe to go thru for cool air, and finalised how the pipe pertrudes from the headlight. Still, for a diy project I think it looks sick af.
Im also in the middle of painting my rims white and am currently sanding everything down.
The remaining 50% consists of getting everything back, and getting all my parts I've bought and then putting it all back together!
I bought a 4g94 wrecker engine with unknown kms for $350 which was an absolute steal. I didn't really care about the condition as long as it ran before it was removed then that was fine by me since I would completely restore it.
I sent crank off to be lightened, balanced, possibly knife edged, checking the journals to see what bearings i can use, possible cross drilling the oil gallery's, refacing the main and big end of the crank.
The block i sent off to be cleaned, crack tested, decked, cylinder boring and possibly tunnel bored if it isn't true enough.
I'm about 80% finished with my headlight intake and cai box. Still got to cut a hole into the box for the pipe to go thru for cool air, and finalised how the pipe pertrudes from the headlight. Still, for a diy project I think it looks sick af.
Im also in the middle of painting my rims white and am currently sanding everything down.
The remaining 50% consists of getting everything back, and getting all my parts I've bought and then putting it all back together!
Attachments
-
Screenshot_20221223-231506_Gallery.jpg -
Screenshot_20221223-231230_Gallery.jpg -
Screenshot_20221223-231250_Gallery.jpg -
Screenshot_20221223-231259_Gallery.jpg -
Screenshot_20221223-231311_Gallery.jpg -
Screenshot_20221223-231406_Gallery.jpg -
Screenshot_20221223-231414_Gallery.jpg -
Screenshot_20221223-231419_Gallery.jpg -
Screenshot_20221223-231438_Gallery.jpg -
Screenshot_20221223-231449_Gallery.jpg
Starke02
Active Member
Cheers big man!
Starke02
Active Member
Farout, i haven't been on here in over 5 months, not much has changed tho sadly
I finally got all my parts i ordered from rpw a few weeks ago. They forgot to send my flywheel tho so that will arrive in the mail in the next week.
Once the flywheel comes, I can drop it off at the machine shop to be balanced with the pistons, rods, crank and pressure plate.
My crank is almost finished being knife edged and polished, and so is my block which is being bored and having the whole works done to that, which is very exciting news!!
Rlly the last thing I've gotta do now is send off my cam to Vic to be reground to the custom spec I want and order the injectors in and then it'll just be a case of waiting for the final stuff to arrive so I can FINALLY get on to actually building the engine.
I kid u not when I say I've thought abt this car every single day since it went kaput late November last yr. Im lucky I have all my other cars but farout they just won't, and don't, compare to my lancer. Even my mx5 just doesn't feel special when I compare it to this even tho its just abt to have a widebody fitted lol.
In the meantime tho while I have some spare time, ill finish off getting the 2 rear rims painted white (the front 2 i finished last yr), and ill finish the headlight intake which just needs the pipe cut back nice n flush so cops can't have a poo over it. And then once the car is running ill get a high-flown cat fabbed up before I send it over to the dyno for a run in tune.
I might also do some painting on the bumpers so it won't just be a fast *poo* box, itll be a sexy *poo*box too.
Anyway, im extremely excited for the cam, which should lope like crazy, super excited for all the lightweight internals incl the flywheel, rods, pistons and crank. This thing should rev bloody fast, and with the cam it should help make the 4g94 a high rpm NA monster. Coupled with the 4.63 final drive, I just can't wait to feel and hear how quick this thing goes thru the gears. This should be one hell of a snappy motor. I just wish that people wouldve done this to their cars so I can actually see what sort of power and acceleration I'd be getting. I mean I lt feels damn cool to think that what im doing to this car is almost like a one off thing, feels like its the only one in the world with my setup. People have done similar but from all my research it feels like I've just gone 3 steps further than most with pure NA build
Ill list the entire mod list for this car 1 more time incase its lost within my other 6 pages hehe:
Bolt ons
- 70mm tb
- Custom short runner intake manifold w/ velocity stacks
- Diy cold air headlight intake w/ 3 inch piping
- Roughly 2 inch headers, bought used
- 2 inch exhaust w/ stock cat. Will get a higflow cat fabricated before the car gets tuned
- Pink 575cc injectors, a bit overkill for now but will run flex fuel in the distant future
- Evo 4/5/6 aluminium radiator (2.8x larger than stock!)
- Stock ecu for now, will go haltech next yr to run flex fuel
- I will change to a 2.5 inch exhaust/ high flow cat once im off my p's (I dont wanna attract anymore attention than it already gets)
Head (sohc)
- Decked 35 thou
- 3 angle valve job on both the intake and exhaust valves
- Larger intake valves, either 1 or 2mm bigger
- Intake ports have been insanely ported to match the intake manifolds ports, and then also polished
- Exhaust ports have been mildly ported and polished
- Custom 284/284 billet cam with 10mm lift
- Stiffer valve springs
- Adjustable cam gear
Block (4g94)
- 12.5 cr 1mm oversized forged cp super-light-weight racing pistons w/ Hastings rings
- Forged steel conrods
- Knife edged and lightened crank
- Block bored out to 2.1L
- Billet oil pump gears
- Arp main studs
- Arp conrod bolts
- Crank, rods, pistons, flywheel and pressure plate balanced
- Stock crank pulley to absorb some extra vibrations (superdampers dont exist for these engines sadly)
- Total static compression should be around the 13:1 ratio. Im hoping it can be tuned well enoigh to not ping or knock being on 98 but we'll have to see
Gearbox
- 4.4kg chromoly flywheel
- HD Exedy performance clutch and pressure plate
- 4.63 final drive (stock is 3.7)
Anything else important
- Will probably go with some re003's for a sticky but inexpensive set of tires. These will go on another set of rims for the track. Currently on 15 inch rims with some amazing Dunlop wet weather/ street tires for daily driving
- Slotted DBA front rotors with street pads but will go for some 2 piston calipers and 255mm 4 stud rotors in the future
- Car has been severely lightened by around 120kg, with it currently weighing in at 840kg, will eventually get it down to 799 with some sneaky cutting and srsly lightweight 5kg each seats (stock seats are 15kg)
- Stock suspension for now, will get lowering springs and good shocks as I dont wanna spend too much more on this car and coilovers r hella expensive
- Once the car is tuned and safely running, I will get the engine engineered, just like I did when making it a 2 seater, so cops can't defect me
Power goals
- Hoping this car can make between 180-200whp and atleast 210nm with this setup. I've seen a few dohc 4g94s make this sort of power but they've had mostly stock heads with forged pistons and rods but are still 2.0L's compared with my 2.1L
- I'm also hoping to get it to rev between 9-10k rpm which is mostly unheard of for sohc 4g94s unless you're in Puerto Rico but it is theoretically possible to make power towards those rpms with my setup
- This engine coupled with the super short fd ratio should allow it to get to 100 in the very low 5s or high 4s considering the cars weight. For example, the 2zz lotus elise weighs abt 20kgs more than my car and maybe about 180-190hp to the crank and goes to 100 in the mid to high 4s. My car should make atleast 200hp to the crank and will make a crap tonne more torque, especially down low thanks to its larger displacement, to help aid in acceleration, which the 1.8 2zz struggles with below vvtli
Soon enough ill have this thing back on the road chopping ss's, golfs and Honda's within low to medium speed accleration
Ill post again once I finish getting my parts and start building the engine and gearbox
I finally got all my parts i ordered from rpw a few weeks ago. They forgot to send my flywheel tho so that will arrive in the mail in the next week.
Once the flywheel comes, I can drop it off at the machine shop to be balanced with the pistons, rods, crank and pressure plate.
My crank is almost finished being knife edged and polished, and so is my block which is being bored and having the whole works done to that, which is very exciting news!!
Rlly the last thing I've gotta do now is send off my cam to Vic to be reground to the custom spec I want and order the injectors in and then it'll just be a case of waiting for the final stuff to arrive so I can FINALLY get on to actually building the engine.
I kid u not when I say I've thought abt this car every single day since it went kaput late November last yr. Im lucky I have all my other cars but farout they just won't, and don't, compare to my lancer. Even my mx5 just doesn't feel special when I compare it to this even tho its just abt to have a widebody fitted lol.
In the meantime tho while I have some spare time, ill finish off getting the 2 rear rims painted white (the front 2 i finished last yr), and ill finish the headlight intake which just needs the pipe cut back nice n flush so cops can't have a poo over it. And then once the car is running ill get a high-flown cat fabbed up before I send it over to the dyno for a run in tune.
I might also do some painting on the bumpers so it won't just be a fast *poo* box, itll be a sexy *poo*box too.
Anyway, im extremely excited for the cam, which should lope like crazy, super excited for all the lightweight internals incl the flywheel, rods, pistons and crank. This thing should rev bloody fast, and with the cam it should help make the 4g94 a high rpm NA monster. Coupled with the 4.63 final drive, I just can't wait to feel and hear how quick this thing goes thru the gears. This should be one hell of a snappy motor. I just wish that people wouldve done this to their cars so I can actually see what sort of power and acceleration I'd be getting. I mean I lt feels damn cool to think that what im doing to this car is almost like a one off thing, feels like its the only one in the world with my setup. People have done similar but from all my research it feels like I've just gone 3 steps further than most with pure NA build
Ill list the entire mod list for this car 1 more time incase its lost within my other 6 pages hehe:
Bolt ons
- 70mm tb
- Custom short runner intake manifold w/ velocity stacks
- Diy cold air headlight intake w/ 3 inch piping
- Roughly 2 inch headers, bought used
- 2 inch exhaust w/ stock cat. Will get a higflow cat fabricated before the car gets tuned
- Pink 575cc injectors, a bit overkill for now but will run flex fuel in the distant future
- Evo 4/5/6 aluminium radiator (2.8x larger than stock!)
- Stock ecu for now, will go haltech next yr to run flex fuel
- I will change to a 2.5 inch exhaust/ high flow cat once im off my p's (I dont wanna attract anymore attention than it already gets)
Head (sohc)
- Decked 35 thou
- 3 angle valve job on both the intake and exhaust valves
- Larger intake valves, either 1 or 2mm bigger
- Intake ports have been insanely ported to match the intake manifolds ports, and then also polished
- Exhaust ports have been mildly ported and polished
- Custom 284/284 billet cam with 10mm lift
- Stiffer valve springs
- Adjustable cam gear
Block (4g94)
- 12.5 cr 1mm oversized forged cp super-light-weight racing pistons w/ Hastings rings
- Forged steel conrods
- Knife edged and lightened crank
- Block bored out to 2.1L
- Billet oil pump gears
- Arp main studs
- Arp conrod bolts
- Crank, rods, pistons, flywheel and pressure plate balanced
- Stock crank pulley to absorb some extra vibrations (superdampers dont exist for these engines sadly)
- Total static compression should be around the 13:1 ratio. Im hoping it can be tuned well enoigh to not ping or knock being on 98 but we'll have to see
Gearbox
- 4.4kg chromoly flywheel
- HD Exedy performance clutch and pressure plate
- 4.63 final drive (stock is 3.7)
Anything else important
- Will probably go with some re003's for a sticky but inexpensive set of tires. These will go on another set of rims for the track. Currently on 15 inch rims with some amazing Dunlop wet weather/ street tires for daily driving
- Slotted DBA front rotors with street pads but will go for some 2 piston calipers and 255mm 4 stud rotors in the future
- Car has been severely lightened by around 120kg, with it currently weighing in at 840kg, will eventually get it down to 799 with some sneaky cutting and srsly lightweight 5kg each seats (stock seats are 15kg)
- Stock suspension for now, will get lowering springs and good shocks as I dont wanna spend too much more on this car and coilovers r hella expensive
- Once the car is tuned and safely running, I will get the engine engineered, just like I did when making it a 2 seater, so cops can't defect me
Power goals
- Hoping this car can make between 180-200whp and atleast 210nm with this setup. I've seen a few dohc 4g94s make this sort of power but they've had mostly stock heads with forged pistons and rods but are still 2.0L's compared with my 2.1L
- I'm also hoping to get it to rev between 9-10k rpm which is mostly unheard of for sohc 4g94s unless you're in Puerto Rico but it is theoretically possible to make power towards those rpms with my setup
- This engine coupled with the super short fd ratio should allow it to get to 100 in the very low 5s or high 4s considering the cars weight. For example, the 2zz lotus elise weighs abt 20kgs more than my car and maybe about 180-190hp to the crank and goes to 100 in the mid to high 4s. My car should make atleast 200hp to the crank and will make a crap tonne more torque, especially down low thanks to its larger displacement, to help aid in acceleration, which the 1.8 2zz struggles with below vvtli
Soon enough ill have this thing back on the road chopping ss's, golfs and Honda's within low to medium speed accleration
Ill post again once I finish getting my parts and start building the engine and gearbox
Attachments
Last edited:
Cleanmin
Active Member
Jesus christ on a *fudge*ing bike, you have been one bloody busy boy! That is absolutely phenomenal mate. I can't begin to imagine just how much this is going to want to fly up the rev range, and the cam should make for a really impressive powerband. Good thing you have upgraded the brakes! I can pretty confidently say that you will need something better than 003's for daily driving, will probably blow them off the rims in a 205 profile lmao Amazing work man, keep us all updates, can't wait to see it in action.
Amazing work man, keep us all updates, can't wait to see it in action.
Starke02
Active Member
Well right now the brakes r still quite *poo* so I def won't be pushing it hard when its back on the road, but I'm 1000% excited to see what the rev range will be like heheJesus christ on a *fudge*ing bike, you have been one bloody busy boy! That is absolutely phenomenal mate. I can't begin to imagine just how much this is going to want to fly up the rev range, and the cam should make for a really impressive powerband. Good thing you have upgraded the brakes! I can pretty confidently say that you will need something better than 003's for daily driving, will probably blow them off the rims in a 205 profile lmao
Im only on 195s too lol
Thanks man
)
Starke02
Active Member
Well I got around to painting the head yesterday. Came out rlly damn good, should last a long time too since its primed twice, 3 base coats and clear coated. Once I get the block back from the machine shop I'll clean it up and paint that, along with the gearbox when I take it out of the car
Ill also polish up the coolant pipes and sensors n crap to get it looking freshh
Should end up being a rlly clean engine bay when im done with it!
Ill also polish up the coolant pipes and sensors n crap to get it looking freshh
Should end up being a rlly clean engine bay when im done with it!
Attachments
Starke02
Active Member
Well that's exactly what im building the engine for, for high rpm range power, bc it will be used quite frequently on the track
I may not see it get to 10k, but I do think it'll get to atleast 9k. I mean I know honda engines aren't exactly comparable to our mistu engines and Honda's heads r vastly better but the k24 has a much larger stroke and people can get it to rev quite high pretty easily, even k24s stroked to q.7 or 2.8 I've seen rev pretty damn high so I think of its built right it can handle those rpms, its just whether or not my engine will make power there.
Well I'm still waiting back on a reply from 2 companies so idk yet
Sorry I thought you wanted/expected low end torque when comparing to the Toyota 1.8.
The engine may rev that high, but it just won't last for very long.
I think around 8krpm is probably about the limit for longevity.
K24s rev but also do not last long at that rpm.
I have a project DC5R and doing my research on a K20/24 build I am planing, and even with forged internals I will only be chasing about 8,000rpm. That is with streetability and longevity in mind.
The pistons and cylinders would get scored pretty quickly at extensive high rpm use
The engine may rev that high, but it just won't last for very long.
I think around 8krpm is probably about the limit for longevity.
K24s rev but also do not last long at that rpm.
I have a project DC5R and doing my research on a K20/24 build I am planing, and even with forged internals I will only be chasing about 8,000rpm. That is with streetability and longevity in mind.
The pistons and cylinders would get scored pretty quickly at extensive high rpm use
re your 10k rpm goal....you might need to do some reprioritizing. Below is table of some important data for you to digest.
4g93 vs 4g94 vs your spec vs K20A vs 4G69 vs Manley Long rod destroker 4g63 (which can rev to 10k rpm all day)
4g93 vs 4g94 vs your spec vs K20A vs 4G69 vs Manley Long rod destroker 4g63 (which can rev to 10k rpm all day)
Starke02
Active Member
Yeah longevity is definetly a big question with this setup, I guess luckily it wont be seeing high revs 24/7 cause ill only track it once a month and drive it on the road every so often, so that might help it last longer. Im not even sure if it'll hit 10k, if it were a G93 then I'd have no doubts, but I do think it'll get to 9k no problem. I think we'll just have to see what the engine does once its done
Starke02
Active Member
Yeah I've definetly been comparing my setup to many different high powered 4cyls. Im just building it to rev as high as it can and make power there, and hoping it'll get close to 10k for pure coolness. If it doesn't reach there, and only gets to 9k or close too, ill still be happy cause I guess there's less wear n tear which is always a bonus
If this doesn't make it to 10k or or close to then ill try my luck with my next car being a RB20det r32 gtst