Re: a6/zc pistons in d15 block
 

you sir are wrong.

207mm vs. 212mm

My first post stands as truth, do the research, do the math.

Just remember, I'm building a D15 with the longer 137 mm rods and P29's, 13.7:1 compression

They stick up a little, .052" with the extra 3mm (.118") rod length. on stock rods they'd be .066", about 1.7mm below deck.

Attachment 23189

Re: a6/zc pistons in d15 block
 

you guys want compression kids with the d15. welded chambers.

Re: a6/zc pistons in d15 block
 

i stand corrected!!..

Re: a6/zc pistons in d15 block
 

isnt the dohc zc block the same as the single cam for the most part? except the gead stud holes right?

Re: a6/zc pistons in d15 block
 

zc block is identicle to the a6 block deck height wise and the fact of the head bolt oreintation and other slight differances..

Re: a6/zc pistons in d15 block
 

Yes you can run d16a1 or zc pistons in a d15 with no issues, a couple of my friends and I used to run a couple motors like that years ago. I've also run regular flat-top d15 pistons in a d16a6 block on stock a6 rods and a welded up z6 head. Only slight issue I ran into with that one was I had to round off the edges of the piston to get it to seat correctly into the head, seeing that the actual piston itself sat above the deck by quite a few thousandths.

Re: a6/zc pistons in d15 block
 

didn't I say you can run the pistons in my first post?

not worth .2 gain in compression......but you can run them.

Re: a6/zc pistons in d15 block
 

what is a 137mm rod out of ?

Re: a6/zc pistons in d15 block
 

in the hole is going to run like a slug


no bueno

Re: a6/zc pistons in d15 block
 

Z1

You could try A6 slugs, but the extra .020" height will hit the head and not even be 10.9:1 compression. I'm having to edge bevel the pistons slightly.

It's a really tight fit with the P29's once you factor in rod stretch. I've had ALOT of help from Tony Bischoff @ BES, you might have heard of them. They have one the Jeg's Enginemasters buildoff the past two years. HAd to go over mass vs. rpms and piston speed to gauge rod stretch. Even one Z1 rod was "tested" for stretch and came in UNDER his predictions, which means a little extra safety.

2006 winners.......by one point over Jon Kasse

http://www.besracing.com/jegsengine.html

2007 winner by 5 points over Jon Kasse