Deciding on a displacement..

[Absit]

I know it's been covered, and I've been reading a lot, but the forums are notorious for half finished threads that don't get resolved so here's what I'm looking at.

I want to run a max of 600 AWHP on my 98 auto with a 6/7 blade HX(super)40 on E85 tuned with ECUFlash. I did the math and found out I need 1600cc injectors and 2 fuel pumps and all that good stuff. I'll have a seperate tune for gasoline in case I can't find E85 at some point. I will be sticking with 7 bolt until I have a reason not to.

My initial plan was to build a 2.3 stroker with a 4G64 crank, but since I'll be replacing the rods and pistons anyway, why not just go with a straight 4G64 w/4G63 head? It's only a little more expensive but gives you better angles and whatnot.

I love torque, the car's going to be a daily driver and cone killer, not much into the drag racing. I guess my main curiousity is how does a 4G64 with forged rods/pistons (purpose built for 4G63 head) hold up versus a 4G63 with 4G64 crank with rods/pistons (stroker of course)? At that point the only thing really different is the block. Assuming equal builds, which one holds up to the test of time and daily use?

 

[TunaTalon]

The difference between a stock 4G64 and a 2.3L stroker is the location of the wrist pin in the piston. All of the angles and velocity profiles are the same.

If you go to the trouble of putting a 4G64 block in you can use stroker pistons and longer rods to improve the rod ratio.

 

[Absit]

If I use a 64 block I wouldn't be stroking it, just sticking with 2.4L. Isn't the rod ratio already better in the 2.4 than the 2.3?

edit: I should ad, in case anyone doesn't know, to hit my numbers I'll be between 30 and 40 pounds of boost.

 

[TunaTalon]

The 2.3L stroker has a 100mm stroke and 150mm rods.
The 2.4 stock has a 100mm stroke and 150mm rods.


The rod lengths and the stroke are the same. The rod ratios are the same.

However if you use pistons intended for a 2.3L stroker and 156mm rods in the 4G64 block you will have a slightly improved rod ratio. See the chart at http://www.dsmtuners.com/forums/str...acement-various-combinations-bore-stroke.html.

The RPM value at the right of that chart is the RPM where the engine has the same peak piston acceleration as the stock 2.0L at 8000 RPM.

 

[Absit]

Ah, I'm tracking now. Either way I planned to use stock length rods with the 64 or stroked 63. I'm not looking for high revs, just the opposite actually.

 

[dsmike1]

I'm in the same boat as you, only im planning on the 7 blade hx35 and shooting for 500hp. I've done a bunch of research and I have decided on the srtroked 4g63. Seems to be very reliable and will definatly suit your needs.

 

[Absit]

I'm leaning more toward the 4G64. When searching, this site seems to say I can only use one from a 93-98 Galant or DSM, but it seems like the following vehicles also came with the 4G64, why can't I use any of these?
93-98 Galant
95-99 DSM
93-94 Colt
93-96 Summit
97-99 Montero
93-96 Expo