Does anyone here have any good resources related to piston prep before assembly? I'd like to educate myself about deburring, polished vs. roughed, coatings, etc.

I'm running shelf CP's and would like to add any insurance to them now that I can, before I assemble the block.

THANKS.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HybridKOOP &raquo;</TD></TR><TR><TD CLASS="quote">Does anyone here have any good resources related to piston prep before assembly? I'd like to educate myself about deburring, polished vs. roughed, coatings, etc.

I'm running shelf CP's and would like to add any insurance to them now that I can, before I assemble the block.

THANKS.</TD></TR></TABLE>


Theres a Chinese guy on this Forum that is very knowledgeable on that BUT he doesn't speak English. Louis you better get your English to Chinese Translator out! lol

 

Terry, you're worse than my fiance!

 

Cp's are pretty clean off the shelf.... at least mine were. I touched them up a bit just for added insurance though.

It's tough to see in the pics, but you get the idea. I went around all the corners and edges.

 

Chris, your motor is 81MM?!

 

No.

 

Well it's under 83.0, correct?

 

My vote is 81.5

But, yes, vTAK for sure.

 

those sleeves looks monstrous.. Looks like a Benson (Darton) sleeve..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TheWickedOne &raquo;</TD></TR><TR><TD CLASS="quote">those sleeves looks monstrous.. Looks like a Benson (Darton) sleeve..</TD></TR></TABLE>

Hey man, how is the rebuild going? Spoke to Tom a few nights ago... hit me up on PM.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HybridKOOP &raquo;</TD></TR><TR><TD CLASS="quote">

Hey man, how is the rebuild going? Spoke to Tom a few nights ago... hit me up on PM.</TD></TR></TABLE>


Good man, some odds and ends .. Like brakes.. etc.. Just need to find some time.

-G

 

Correct. 81.5mm.

They are Benson sleeves as well.

All CP pistons 81.00 through 83.00 have the reliefs cut now.

 

83MM doesn't have them clipped out.

I think it's 82.5MM and down.

 

Nope.... 83's and down....

Trust me on this one. You must have an older version if you still have reliefs.

 

Incorrect. Never made an 83MM with trimmed reliefs. Only 82MM and smaller.

CP: (949) 567-9000

 

oooohhhh, take that! lol

 

LOL. He figured out that they were a custom set thru CP.

 

Right. They were a modified shelf piston. I didn't relize that. Oops.
Hahaha

 

Who modified the reliefs of those 83mm pistons? Also I wonder why the do not make reliefs on the larger MM bores??

Maybe some of you engineers can lead me to an answer or give me answer.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BLK JDM &raquo;</TD></TR><TR><TD CLASS="quote">Who modified the reliefs of those 83mm pistons? Also I wonder why the do not make reliefs on the larger MM bores??

Maybe some of you engineers can lead me to an answer or give me answer.</TD></TR></TABLE>


I know I just got some Custom Wiseco Pistons through RLZ Engineering and my valve reliefs are cut. I was curious when I saw this.

 

CP modified them.

It's not necessary on the larger bores because there is plenty of meat on outter edge of the valve relief.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tepid1 &raquo;</TD></TR><TR><TD CLASS="quote">CP modified them.

It's not necessary on the larger bores because there is plenty of meat on outter edge of the valve relief.</TD></TR></TABLE>

 

I took a forged piston that was damaged and went around with my tig welder and just started seeing how much heat it took to make things melt. The EASIEST place to get flow (melt) was right where the valve relief met the cylinder wall