2.2 over bore or 2.3 stroker

[trackrat]

I've been on here awhile never posted really just lurked

First thing this car is track only, for road courses


So i' deciding to go 2.2 or 2.3 stroker for my engine build. Stock engine has about 12K miles 8K of them are track miles. Trying to get more torque out of the engine , but pretty sure it won't survive much further on the stock bottom end. IE this is where we stand ...

I believe the 2.2 is going to make much better top end without giving up the RPMs but the 2.3 might seem like a better idea longer term since the engine might have less issues due to keeping the stock bore although i would loose top end , i would have a slightly quicker spool/ response not to mention potentially a quieter/smoother engine . Goal is for about 500 - 550 whp on track ( equates to about 600-625 full out )


I'm looking at reliable power without heat soak concerns ect. Any recommendations between the 2 are greatly appreciated ..


Also i'm curious what people think of the darton 2.2 sleeves ? Looks like possibility for
the engine running hotter along with all kinds of temp issues due to metallurgy differences ? Or even possibility of oil starvation on multiple hard turns ?

[David Buschur]

We will be releasing a 2.3 engine very shortly. I would recommend that over a 2.2 build. The 4B11 has great RPM ability already, For road racing I can't imagine you needing much more. We also offer Darton sleeved blocks, I have ready to be built at the shop now. For a build like yours Id recommend it, the cylinder walls in the 4B11 are the weakest point.

[trackrat]

Is that a 2.3 stroker or 2.3 overbore ? Also any feedback on the new darton sleeves in regards to higher engine temps, ect more prone to heat soak ?

[David Buschur]

That's a stroked engine, I'd never overbore one that far, it would be retarded to attempt it. No feedback on the sleeves other than they are strong enough to not push apart like the stock bores do.

[trackrat]

Thanks for the feedback, will try to give you a ring this week .

[evox2nr]

That's a stroked engine, I'd never overbore one that far, it would be retarded to attempt it. No feedback on the sleeves other than they are strong enough to not push apart like the stock bores do.

Just curious about when you started to see this, and at what power level. I was kind of hesitant on how far to take things with my motor because your new view, though things are holding fine for the time being. BTW, your built motor description still says the stock sleeves are fine(might need an update).

[David Buschur]

The EVOX engine section is going through some changes actually. It will be edited. There is no set power level. I've got quite a few EVOX engines out there making well over 500 whp. This isn't something you see as an actual failure, so it kind of goes unnoticed. The ring seal at the top of the cylinder just gets worse and worse.

[evox2nr]

I guess I will keep an eye on things then... thanks for explaining a little further