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Author Topic:   Hyper Pistons?
Eljojo
Dirt Forum Champ
Total posts: 1005
posted December 18, 2005 03:44 PM  
Kieth Black
or
Speed-Pro?

DCI racing
Dirt Roller

Total posts: 14
posted December 18, 2005 06:29 PM  
get the weight,and use the thinner rings, don't pay any mind to the coat on the speed pro it dosen't last long. kb the chose of the two. imop a set of srps for 30% more will last for 2-3 years in a clamer motor, use file fit or total seal has a gapless top ring they clame 20hp.

leapinlizard
Dirt Freak

Total posts: 438
posted December 19, 2005 07:33 AM  
Not much difference between the two makes.

I have found the Speed pro is a little lighter than the KB. But a few grams doesn't mean anything.

Pay attention to the KB ring gap instructions.

dirttrackin94
Dirt Maniac

Total posts: 135
posted December 19, 2005 08:08 AM  
i have had ALOT better luck out of the speed pro..i use the coated skirt dome pistons,i always stay at 12:1 compression,and i have never had the coating go away.our last motor had over 2000 laps on it total,coating is still on the pistons and that motor is still together and used as a spare(383ci)....good luck!

PEwaste
Dirt Full Roller

Total posts: 73
posted December 19, 2005 11:18 AM  
I have ran Hypers for the last 2 years with no failures. I have seen people put brand new Hypers in and break them in Hotlaps. If your racing a class that has strict rules or has a claim rule which is used, not a claim rule that is there... then you can run hypers up to 550 HP without a whole lot of problems.

For the extra $200, or even $100 if you shop at the right times, the Forged pistons are much better. Hypers are very brittle when warm and will shatter wtih the first hint of a valve dropping.

Forged will be in the motor for years to come. Check E-Bay for good deals on forged Pro-Trus and Mahles.

brabbit75
Dirt Full Roller

Total posts: 66
posted December 21, 2005 09:47 PM  
I have never used kb pistons, but i must say i do like the speed pros with the coated skirts. they seem to be the piston a lot of people around here are using in their race motors.

ss99
Dirt Maniac

Total posts: 130
posted December 22, 2005 06:10 AM  
I've used he kb231 from Keith Black with no piston-related problems. It's a lightweight (485g) piston with the thin ring package. CNC stocks them for around 225 a set.

Speedracer92
Dirt Forum Racer

Total posts: 81
posted December 22, 2005 06:50 AM  
I ran the coated speed pros in a hobby motor for 2 seasons without freshening it. The pistons and cylinder walls look great yet and I didn't have any issues. I plan on keeping that motor as a back up now.

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