Stroker compression?

[x2ryder]

Had a change of plans. Decided to go from a 5mm stroker 83mm bore to a 5mm stroker with 85.5 bore (Northwest sleeves). I am running a Speedwerx race pipe and ADA head girdled with a set of 48 Novi's. Also a MSD enhancer with a TBM aluminum flywheel. I want to run 93 octane fuel. So I talked to Speedwerx and they said run 150psi. What do you guys think? I was thinking more like 170-175psi? Do you really think you are going to see a difference between 150 and 170-175? I want this motor to live.

 

[Speedfreak]

What does your engine builder suggest. LOL Have you talked to any of them. I think 150 seems kinda low when you put that much into a motor. And a motor running 200 Psi can have along healthy life also it is just how it is built.

 

[2XLR8]

150 will make your engine last longer. There should be a big noticeable gain with the 175 psi. If you wont hold it wide open for long periods even 185 should be OK. If you do then 150 sounds better.

 

[x2ryder]

My engine builder says no more than 175 on 93 octane.

 

[njfl]

When I first got my Jetworks motor running 150psi (Art wanted to be conservative to ensure there wasn't too much heat buildup with the 90mm pistons) it ran nice, but after I ran it a while, it looked safe to increase compression. In going to 185 I felt a huge difference. I pushed it even further to 205psi. I have to say that the difference from 150 to 185 was much more promounced than 185 to 205. I would definitely suggest running around 180 to have a good blend of reliability and power.

To answer your initial question, yes, I think you will see a noticesble difference between 150 and 175.