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Author Topic:   KB pistons
PBR
Member
posted January 29, 2001 10:43 PM
Is their any thing I should know about building with and running them.What about the new light weight pins are they really worth the 60 or so grams in reduction


iaracer
Member
posted January 30, 2001 07:57 PM
Pay attention to the timing specs. Some KB's don't like alot of timing....


fury
Member
posted January 31, 2001 01:04 AM
I have a new set of SIL KB195. How much is to much timing? Using a Davis Unified Ignition-suggested plug gap of .050"-.055". Thanks Bob


Racer 111
Member
posted February 03, 2001 06:19 PM
Had them in a engine for 3 years.No problems.Engine builder use's them alot.Good pistons.The lighter pins will help you rev faster.It only takes a few grams of weight to make a big difference.


MOD RACER#93
Member
posted February 03, 2001 08:07 PM
THANKS Mod RAcer #93 Told the compression would be about 13.25:1, 55cc Combustion chambers. Starting with 51 sparkplugs. Thanks again


RangeRover
Member
posted February 07, 2001 09:27 PM
The #1 thing to remember when using these pistons is that the high silicon content of the hypereutectic alloy will cause more than usual amount of heat to remain on top of piston, thus larger ring end gaps are required on the top two rings or the heat will cause them to **** together and cause alot of nasty damage. A top engine builder on the west coast told us .030 on top and .020 on second rings in a 355 ci street stock motor turning 6700 rpm. These type of pistons have a bad reputation with some folks, but it's only because they don't understand their characteristics and are unwilling to deviate from conventional engine-building practices. We use them, and we like them.


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