1. If a 100mm crank using a 4G63 block nets you a 2.25ltr, then what will a 92mm crank net you?

2. Also, going with a 92mm crank, will you get a very noticable loss in tourqe\spool going down from a 2.25ltr to a possible 2.1ltr.

3. One more question. I've been reading here and there about the brian crower 2.4ltr stroker kit using a 4G63 block. Does anyone know of the RPM limit of this kit? It runs a billet crank, so I'm guessing it has a higher safe rev limit than 7500-8000, but since I don't know anyone tha has this kit, I was wondering.

I'm looking to step up alittle here, and wondering which way I should go if anywhere. I'm presently on the 2.3 (via 100mm 4G64 crank), but would like to spin it higher. Just wondering. 7500 comes up way fast. Who knows maybe all I have to do is get a billet crank, and spin that higher. I don't know.

 

Brian crower also makes a 2.6L

 

I have a 4G64 block sitting at a friends place I can use today, but how realistic is a 2.6 ltr. I guess you could spin it to 7500, I don't have the cash to trailblaze.

 

It's not the crank material that effects rev limit. It's the piston speeds. If you use a longer stroke crank then for every revolution of the crank the piston travels a longer distance. Therefore piston speeds are higher for a given RPM versus a shorter stroke crank.

If you are wanting to rev higher, maybe as an idea, you could post your dyno chart and ask people to give you an idea of optimal place to shift? Maybe shifting at 7k is ideal and you don't need the extra revs?

Apart from that, I think most people agree 4G64 block with 100mm crank and stroker pistons and longer rods is a great choice. Or something like AMS 2.3RR which I think is 4G64 block with a custom crank with a shorter stroker than 100mm so you get 2.3 litre and even more revs than the usual 2.4.

Problem is the 2.3RR is expensive, and not many shops do 2.4's....

 

If I recall correctly you are on a 2.3 and HTA?

Which probably means you make full boost around 4500 rpm in 4th gear?

That means you get good power already around 4k... then massive torque around 4500 rpm, then goot power for another 3000 revs to 7.5k and shift. That sounds pretty good to me.

Someone on a 2 litre and HTA I suspect will make full boost around 5000 rpm or so, then they can spin to 8k, which gives them a 3k power band, but less overall torque.

Now a 2.2 would be a compromise somewhere between the two but I'm not sure it's naturally better or worse just a compromise.