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Author Topic:   kb hyper pistons?
the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 04-19-2002 04:22 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
has anybody ever broken a hyper piston in a 347? is this common? cause it looks like i have 1 broken,$$$$$$$$$$$$$$$$$$$$$$very unhappy

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67Coupster
Gearhead

Posts: 189
From: Fortson, GA, USA
Registered: Oct 2001

posted 04-19-2002 06:06 AM     Click Here to See the Profile for 67Coupster   Click Here to Email 67Coupster     Edit/Delete Message   Reply w/Quote
Where did it break at? I run them in my 393W and so far so good. I have no intentions on using nitrous so I hope they will be ok. Only bad rap I've heard is when the top ring is not gapped per KB instructions.

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James
67 Coupe
393W, AFR 185, 4 Speed, 4.11 9 inch
7.09 @ 97MPH 1/8
1.55 60'

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bluestreek
Gearhead

Posts: 1724
From: Athens,GA
Registered: Jul 2001

posted 04-19-2002 09:38 AM     Click Here to See the Profile for bluestreek   Click Here to Email bluestreek     Edit/Delete Message   Reply w/Quote
I have seen them break at the ring lands very rarely if the rings aren't gapped enough. The KB pistons don't absorb as much heat and don't expand like other pistons and the top rings tend to heat up more and need a little more gap . If this was the cause, you will need to add about .010" to your current top ring gap on all pistons.

BS

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 04-19-2002 09:45 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
They are also said to shatter like glass under heavy detonation.

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'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

MCA Member # 47773

My wife says I don't pay enough attention to her... or something like that...

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Butch Jennings
Gearhead

Posts: 633
From: No. California
Registered: Apr 2000

posted 04-19-2002 12:29 PM     Click Here to See the Profile for Butch Jennings   Click Here to Email Butch Jennings     Edit/Delete Message   Reply w/Quote

I've seen quite a few of them come apart in hard running street/strip cars, I've learned to think of them as an expensive cast piston. I won't use them at all, in a mild street/tow application I'll use a good cast piston and in any type of hot rod application I'll go forged. But then, I feel the same way about the cast steel cranks. I'll either go with a "quality ground" iron or jump up to forged steel....Just my 2-cents.

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Butch
460 powered 1967 Comet Cyclone
10.271 @ 130.069
Butcher's Home Page
"Friends don't let friends drive Chevys"

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