Other More squish and squash questions

[Freakrider]

I've read through this post and did I miss the part where the domes themselves were checked? Just because someone made them doesn't mean something slipped through the QA process. Why would pistons be the first thing or the rods? Move the domes around then look elsewhere. If you have .005 on piston and .005 on a dome or .002 on a rod it could be a matter of several small variences. Cranking pressure and squish do not corralate directly. What really matters is not psi but ratio.

he said " I had the .010" difference with 38cc domes and the 33's I just bought" in post # 17.

From my understanding MSV (maximum squish velocity) and ratio is what matters...

 

[RoTAxGreNade]

2 different sets of domes - both brand new.

I'm not really concerned about what my end compression will be - I know it's gonna be up there, it's the squish relief I was checking during build up and the fact the two are off.
The head was purchased new and never used ( say 2009?) and the 33cc domes right from ADA last week so it might be safe to say the domes are from a different production run.
Never had this issue on any motor I have built nor heard of ...

 

[2XLR8]

I guess you can reposition the pistons with the arrows pointing towards the intake this will verify if the pistons were machined correctly and since they are wiseco the tops should be concentric due to the fact that the tops are machined where as the cast pistons are not. If you reposition the pistons and the squish is the same as it was before then its the rods. If the squish changes 180 degrees then its the piston pin bore alignment.

 

[waterfreak]

Dre, did you check your squish with a piece of solder on all 4 corners of your cylinders? .045 is reasonable for pump gas but .035 is way too tight! If so, I probably would use 2 base gaskets to solve the problem

have you called x-scream to discuss the issue?...what did chucky say?

 

[CARBONX2]

Dre, did you check your squish with a piece of solder on all 4 corners of your cylinders? .045 is reasonable for pump gas but .035 is way too tight! If so, I probably would use 2 base gaskets to solve the problem

have you called x-scream to discuss the issue?...what did chucky say?

Just need 2 pieces per cylinder, in-line with gudgeon pin for accurate squish

 

[Freakrider]

find out anything ?