4G64 destroker

[stealthx32]

Hey all. I hail over from Ziptied...some of you might have seen my thread about looking into a 4G63 w/ a B2600 bellhousing into an FD. Sorry if some of these questions are repeated, I just found you guys. I'm pickin' up an FD this weekend, and hopefully I'll be finding a B2600 bellhousing soon.

So, 4G64 with a 4G63 crank, 162 mm rods, and 9.0:1 Wiseco pistons to make a 2.1L destroked block. I heard it revs to 11k. Is that true? Piston speeds would be above 6000 feet/min...

There's a bunch of 7-bolts wideblocks on car-part.com, but is there any benefit? I've read the smaller port 2G head has better midrange, while the 1G has better top end. The cam angle sensor on the 2G located on the front might be worth making the swap though...but then again you can bore the 2G head stud holes 1 mm larger to be put on a 1G block?

I don't know my Mitsubishi turbos at all...do they make manifolds that have a T3 or T4 flange on them? Then again, I don't even know where to start to find a turbo that'll keep up to 11k if I go that route. 288/288 cams probably? What other supporting modifications will I need? Oil pump will probably get cavitation and I'll need to go dry sump... The OEM crank should perform adequately hopefully?

If I remove the balance shafts, would it be a good idea to balance the crank? And if I'm balancing the crank, do I need to send in the whole rotating assembly or just the crank itself?

Can someone provide a little more detail about the unbridged main caps?



Are these the unbridged ones?

[Bill Hincher]

sounds like a cool project, I like the destroke train of thought, I like the longer rods you could run,using the 4G64 tall block with the first gen 6 bolt crank is a great combination,but I wonder, what fuel would you run at 11000 RPM? where is your useful horsepower/torque curve and how would you develop your drive train to match the engines output?
the first gen heads are going to out flow the second gens hands down, dry sump is and excellent chioce, the CAS is not a problem, bellhousings are no problem

where do we start? and where the hell is 'Ziptied'?

[Matt Arruda]

Sounds like a cool project your in the right place, stay away from the 2G bottom end, as far as the head Ive read mixxed reveiws, I dont have flow data proof so take this for what its worth. Stock for stock I say the 1G head will make more power but the Ideal combo would be a ported 2G head. The 2 G head has a less drastic intake angle but the ports substantially smaller hence with porting I beleave it will make more power. This is the combo I have I will keep you posted on my findings once its dynoed.

As far as Bell housings go the above poster "Bill" has you covered visit his web site in his signature and soke it all in hes taken all the hard work outa doing this type of swap.

As fas as billet mains go I dont have much experience with them but I can tell you ive personally seen 650 WHP on stock mains although this wasnt spinning the motor to 11K so maybe someone else can chime in as to when they are neccessary.

good luck in your build and keep up posted on the progress

[89coltgt]

It sounds like you are on the right track. I would look into a Kiggly girdle if you are revving that far, Go with a 6 bolt 2.4 block also, then simply use the 1g head. You will need some large cams, 288's will work good, but you will need to run a good set of springs/retainers to spin em that fast.




http://www.kigglyracing.com/parts/Main_Girdle.htm

[citrus3000psi]

I'd be more concerned about what tranny you'll be using..

High reving motors are a blast to drive. My ITR fuel cuts at 10k. And with shortened gearing (5th gear is 1:1) its just awesome. However running on the interstate around 80mph im sitting at over 5k.

[jeffball610]

Talk to some builders about 2.1L options for the oil supply and such. I know Magnus and Slow Boy Racing both run destroked motors.

Everyone says stay away from the 7-bolts, but I like them. If built properly, they are actually better than a 6-bolt. Stronger crank and built in main girdle. But everyone has an opinion. I don't know if you could find a wide block 2.4L though. And you'd need one to run that B2600 bellhousing.

The Mazda transmission might do alright with high revs. They were built with 8k+ rotorys in mind.

Turbos you might be hit or miss with. Anyone running a high rev motor like that will be using huge turbos for drag. I've always wanted to see a NA build, but that's just me. To get those high revs, you will need some support mods in the head. (duh)

Spend some time on here and other forums just reading what people have done, or what they have talked about. Bench racing isn't always BS. Sometimes people chime in with good info.