Author Topic: What does everyone use as lappping compund?  (Read 1964 times)

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Offline sandman540

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What does everyone use as lappping compund?
« on: September 29, 2009, 12:04:24 AM »
Just to pick everyones mind a bit.....What does everyone use as lapping compound for lapping a head??.  Clover, the valve lapping compound??. Lap on a surface plate or a piece of glass???.  Any thoughts would be  appreciated.

Offline jfabmotorsports.com

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Re: What does everyone use as lappping compund?
« Reply #1 on: September 29, 2009, 01:43:15 AM »
I use 320 wet/dry sandpaper on a cast-iron surface plate. That grit works real good after a fresh machine job. I go a little more aggressive if its a used head.   

JFAB
Don't just float through life, make waves!

Offline barryadam

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Re: What does everyone use as lappping compund?
« Reply #2 on: September 29, 2009, 02:59:51 AM »
Just to pick everyones mind a bit.....What does everyone use as lapping compound for lapping a head??.  Clover, the valve lapping compound??. Lap on a surface plate or a piece of glass???.  Any thoughts would be  appreciated.

Lapping is done part-to-part for mating parts.
Surfacing is done on a plate.
Clover is good choice for lapping compound.  I use several grades.
Surfacing is just as JFAB says.  I usually go 320/600 on a calibrated granite plate.  Be sure to use a good spray adhesive on the paper, not tape.

Some more info here:

http://www.kxriders.com/forums/index.php/topic,6105.0.html

"I hate heli-coils. They are like hospice for motorcycle parts."- BDI