Quote:
Originally Posted by gmanelan
Thanks for your feedback Henry - I have a lot to learn, and your comments have raised more questions for me.
The bible I jokingly referred to is Wayne Dempsey's book.
I did read on this forum of somebody who successfully bored out to 86mm with no problems but I have also read a lot of folks like you who say not to, so I'll take that as a warning. Sounds like you recommend the biral anyway as they will cool better so might just bite the bullet and replace.
Out of interest - why don't iron cylinders need the squirters? I appreciate they didn't have them originally but wouldn't it be a good idea to have them if I am splitting the case anyway to help cool the pistons?
The Je pistons I was looking at are 9.2:1 with my crank and are actually advertised as low compression which is a bit weird given your comment that 9:1 would be a better target. I live in UK and 98/9 octane is readily available here.
Is the SC pump something you think necessary? Appreciate everything helps, but I am working to a budget and wonder whether the original pump will suffice if its in good condition.
So here are my take aways:
- Go with new birals over original iron cyls
- Add a front oil cooler
Thanks again for your help
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If you're on budget and hoping to go with JE pistons and Biral barrels you should check out AA Performance Products. The cylinders are Chinese but reasonable quality and they offer a JE piston option. I've sold a few sets over the years and except for some ring gap issues with the 86mm, no complaints.