232 crank vs 258 crank

[nick]

Much like 1bolt, I am entertaining the idea of using the 232 crankshaft with 3.500" stroke vs the 258 crankshaft with 3.895" stroke in my stroker because 1. I am building a race motor that will need fast response and 2. the engine will have turbos so I am not worried about making a big displacement motor.

I also have not decided whether I will use 4.0 (6.125"), 4.2 (5.875") or Eagle rods (6.150"). I'd like the Eagle rods for strength with boosting, but not sure I want the long rods.

I will be using forged pistons with 28-32 cc dish and possibly O ring block and head

I am basically writing this here to entertain ideas and thoughts from fellow experts

[YJason]

I think by using the 232 crank your only getting .087 more stroke and defeating the purpose of building a stroker. For fast revving I'd go with the 4 counterweight 258 crank. Mine revs really quick and has excellent throttle response. Well it did until I broke the timing chain but thats a whole nutter story.

[nick]

I think by using the 232 crank your only getting .087 more stroke and defeating the purpose of building a stroker. For fast revving I'd go with the 4 counterweight 258 crank. Mine revs really quick and has excellent throttle response. Well it did until I broke the timing chain but thats a whole nutter story.

Thanks. Yea I know it doesn't add much to the stroke, but it is a lighter crank than the 4.0. I am very aware of how well the 4.6L preforms as I helped Gradon build his and have driven it. It is insane! That sucks about the timing chain.

I was just thinking of Barney Navarro and destroking the motor with O-ring plus lots of boost. I am looking for 450-500 to the wheels.

[Plechtan]

Look at what Turbo Tom has done, 450HP on E85.

[gradon]

I've been telling him we need to go w/ the 3727 because it's lighter and I want to use the Eagles, so I say the next step is to price the Diamonds. . .
He does want it to spin up to 6K, so avoiding those cam harmonics is gonna be a chore. He's trying to chase Navarro #s, but I say 400hp/450lb-ft at the wheels ought to be w/in reach on 93 octane with a 10# boosted 4.6 and more than enough for a 2500# 'manche on 275s to be able to put down.

[Plechtan]

He's trying to chase Navarro #s, but I say 400hp/450lb-ft at the wheels ought to be w/in reach on 93 octane with a 10# boosted 4.6 and more than enough for a 2500# 'manche on 275s to be able to put down.

Comanche curb weight for the swb is around 3,100 lbs (2wd) and 3400 for the LWB. To put that kind of power to the ground it would be a good idea to use a the 4wd. I don't think a 231 t case would hold up.

[nick]

He's trying to chase Navarro #s, but I say 400hp/450lb-ft at the wheels ought to be w/in reach on 93 octane with a 10# boosted 4.6 and more than enough for a 2500# 'manche on 275s to be able to put down.

Comanche curb weight for the swb is around 3,100 lbs (2wd) and 3400 for the LWB. To put that kind of power to the ground it would be a good idea to use a the 4wd. I don't think a 231 t case would hold up.

Getting the weight down to 2700 should be easy, but lower will be tougher. I have the 2wd. The 4wd would only be beneficial for me during drags. I have a 242 on hand, but I will probably be selling that soon though.

As far as the Engine and crank specs go. I have decided to get a chromoly fabbed offset crank made that will compliment the custom rods, pistons and roller cam I will be using to make it a 5.0L with .060 overbore. Details and project will all be listed in my project thread.

[Plechtan]

A fabbed crank? You mean a bunch of pieces of metal welded togather? I don't think i ever saw that. Do you have any links? Or are you just talking about a Billet crank? A billet crank will probably run $3,500 or more.

It's hard to get to 5.0 without going to a 4" bore. ( .120 over) The later blocks have thicker cylinder walls and are better if you are going way oversize.

I had a custom solid roller cam made for the Bonneville truck, and that cost me to ton as well. You may end up with 10K or more into this motor.

[1bolt]

I think by using the 232 crank your only getting .087 more stroke and defeating the purpose of building a stroker. For fast revving I'd go with the 4 counterweight 258 crank. Mine revs really quick and has excellent throttle response. Well it did until I broke the timing chain but thats a whole nutter story.

The basic reason a 232 might be interesting really doesn't have anything to do with increasing the displacement of the engine. The 232 crank puts a stock sized 4.0 rod and replacement piston into super tight quench territory and elevates the compression ratio. Doing this any other way probably requires custom pistons and more machine work. I say probably because you never know what oddball combo might pop up, the 232 crank stroker is just such an "oddball" and is a product of the "imagineering" that goes on here.

IMO the 232 is an "elegant" performance build but not something that going to be interesting to the average Jeeper. It is extremely interesting to someone who is considering high octane pump gas or E85. With a deeply dished forged piston (or race gas) it is also a very interesting build for forced induction.