Well, after some costly mistakes at the machine shop, I had to purchase some 81.5 JE 11.5:1 pistons for my "poor man's type-r." The final CR should be close to 12:1 after decking and milling.
Hopefully I will get my pistons tomorrow and start the assembling. I would like to know if I should sand down the sharp edges of the pistons before putting them in?

Also, what do most guys run for ring gaps for the JE pistons? I have seen from doing searches that they should be = bore * .0045" to .0060" = .014 to .019. This is going to be an NA car, but it may see some N2O at some point.

Since the pistons have low silicon content, I know they will expand. That allows for greater piston to wall clearance as well. I have heard .003"-.004", what do you guys recommend? Thanks for any input.

 

bump

 

usualy .004 per in. of bore

 

Fnkned, where is your shop located at? I'm guessing from the title that you build and prep racing heads. I never heard of Collingdales, so what is that near.

 

about 5 mins. south of phila right off of I95. will be glad to help u .

 

do not sand down anything on your pistons