I have a 2.4 stroker (4G64 block underneath a 4G63 head) and I'm wondering as to whether or not a 2.3 stroker would have been a better choice. I accquired my evo with this engine so it wasn't exaclty left up to me to decide. I'm just wondering if it's an even better alternative than a 2.3 stroker... Some input would be highly valued thanks...

EDIT: The reason why I am asking this question is because I know a 2.3 stroker is tried and true but I have personally never heard of anyone doing this to an evo.

 

Ive heard many great things about the 2.4. Gobs of TQ. The only downfall from info i've read is that the cly walls are a little thinner

 

that, and it obviously redlines sooner

 

the 4g64 doesn't have oil squirter's unless they were machined on

 

IIRC, the 4g64 block has a taller deck height than the 4g63 so the timing marks are off on the 4g63 valve cover

 

the 2.4 has its positives and negatives, positives : alot more torque, spools faster & makes a great daily driver with a "big" turbo, negatives : lower redline, needs machine work(oil squirters), water pump bracket needed, 4g64 timing belt required or adjustable cam gears, additional shift into 5th in the 1/4 mile due to redline restriction. I know im forgeting other stuff but you get the idea.

Edit: you already have a 2.4 its not worth it to go 2.3. See if you can hit your goals on the strocker setup if not i would go 2.1 or 2.0

 

If you go .040 overbore (unless I did my math wrong) and 100mm stroke, you'll get 2.324 liters of displacement oout of the 4G63 which is close to the 4G64. THen you won't have to mess with adaptor plates, cam gears not lining up, and all the other minor annoyances that come with putting a 4G64 in your Evo. Not to mention, from what I've heard/read, the headgasket is known to be an issue with the 4G64 + 4G63 head.

 

People have made excellent power on the 4G64. It's been somewhat popular with DSMs for awhile. Search here and on the DSM forums to learn more about your engine. It's a perfectly good and popular setup, except the water pump bracket and timing marks issues already mentioned. Your accessory belts also much be 4G64 IIRC.
I assume it's a stock 4G64, not built?

 

It has to be built, the stock 4g64 on the 4g63 head would produce a compression ratio in the 11s

 

Thanks for that info! All the better then for the OP. You're in a good spot IMO.

 

Lol the 64 block is very, very built. The comp ratio is 8.1 if I remember correctly. The motor was built without cutting any corners and things were performed that really weren't required of for the accertained power to be made but the guy had the money and alot of the work was free because it was to be a promotional car for a company.

All of you guy's info has been helpful to me, so that I can figure out what I have going on under my hood. It's just a pain in the *** searching for info on this. You wouldn't believe how many posts there are to do with a 2.4 that are just people saying how cool it would be lol. Nobody that actually has one or any info on 2.4 builds.

EDIT: So my motor revving to 7800 is a bit excessive aye? Lol.

 

Please take this as food for thought.

You already have a 'big block' under the hood. Ok, so it doesn't rev to 10k, big deal. Take advantage of the torque and use a turbo set-up that is most potent in your rpm range of choice. ( fp red, twin scroll hta 35r, 3065-- stick with a cast manifold for sure ). Make sure you use an intake manifold/tb that will give you some life, an AMS VSR/75mm would be nice. And MOST importantly, modify the final drive!!

I've been in contact with TRE and they have gearing that would suit you perfectly. The gearing will keep your revs down through the traps.

Gobs of torque and traction = quick et's and a great street car. ( If you don't break )

Spend the money on TC and axle upgrades, if you get your combo right you will need them. Wouldn't hurt if you put the car on a nice diet either since light cars are more reliable. Ultimately, you should be aiming for 550awhp/525awtq on pump gas.

 

Road Race Engineering builds 2.4's (technically not a stroker, since it comes with a 100mm crank) all the time.

The AMS 2.3RR is a 4G64 block.

 

i agree, i would love to see some hard info and techs on how to build it