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Author Topic:   speed pro piston top ring gap?
Istock66
unregistered
posted November 26, 2004 03:20 PM           
What does speed pro say to gap the top ring at? I have allways used Kb pistons numbers to do it.

Thanks, Ill search for it online and see if I can find the answer.

istock59
Member
posted November 26, 2004 04:53 PM
Speedpro hypers, I assume.

Standard ring gaps, is what they say. I had better luck opening mine up to KB dimensions.



Istock66
unregistered
posted November 26, 2004 05:51 PM           
hypers,

My rings in the hole are at .015 now, unfiled.

Kb specs call for .033 quite a diff.


Eljojo
Member
posted November 27, 2004 06:44 AM
Jeff, stay with what SP reccomends. The KB pistons are engeneered differently to allow the top ring to absorb more heat. I've never used the KB's---when their hypers came out I had several buds who didn't file the rings properly and jerked the top off the pistons..just got a bad taste for them right off the bat. I have three motors with Speed Pors in them ---all filled to .015/.018
Jojo


istock59
Member
posted November 27, 2004 07:11 AM
ANother thing I thought of with the Speedpros. If you're using them with floated rods, pitch the cheap wire-ring locks, and replace them with a good set of spirolocs.



donslink1
Member
posted November 27, 2004 05:34 PM
that must be the same motor builderr that says you cant put valve seats in double humps.

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Istock66
unregistered
posted November 27, 2004 07:51 PM           
I knew that was coming.

The guy who doesnt want to put seats in my hump heads is Roger Haden, his son raced a mod last year, won 22 races sold 11 motors and claimed back none I believe.

Hes only built all his own race motors for many years since he used to own a machine shop, maybe his tolerances arent good enough for them to stay in, which is very possible.

Since **** do a whole set of heads for me cheaper than anyone else will do a valve job and replace the 2 seats I am not complaining.