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Author Topic:   keith black pistons
bryanb30
Dirt Freak

Total posts: 243
posted January 28, 2005 02:30 PM  
is it ok to run total seal gapless rings with keith black pistons?

J3
Dirt Maniac

Total posts: 188
posted January 28, 2005 10:13 PM  
quote:
Originally posted by bryanb30:
is it ok to run total seal gapless rings with keith black pistons?

Nope, tried that and blew the top off of the pistons, ruined a brand new motor. I had more pistons, cam, and valves in the oil pan than were they were suppose to be.

Todchester
Dirt Roller

Total posts: 23
posted February 01, 2005 10:25 PM  
I have run total seal gapless rings in a 6" rod 383 with KB 123 pistons for years. You MUST make sure ring end gaps are correct. But this is true regardless of ring type.

brownstone
Dirt Freak

Total posts: 284
posted February 02, 2005 07:04 AM  
putting gapless rings on a kb (not forged piston is asking for trouble. If you read most of the posts in here you will see that lots of racers are pulling the pins out of the cast pistons, hypertech or not.

So now if you put gapless rings your are asking the same piston that has been failing to hold up with gapless rings.

If you have to have gapless then prevent yourself from catastrophic engine failure and get forged pistons

Flanndad
Dirt Freak

Total posts: 255
posted February 03, 2005 05:06 AM  
Just got the new Speedway Motors catalog.
And inside it they have a section on the top ring gap for Keith Black piston, they have 9 different application factor's you can use depending on what motor you have.
For example a circle track unrestricted motor has .0080 factor that you have to multiply by the bore size
4.125 x .0080 = .033 top ring end gap.

You really tneed to get this right with Keith Black Piston, because it will blow the motor up.

hobby10k
Dirt Freak

Total posts: 226
posted February 03, 2005 05:43 AM  
what is the best piston for the buck? forged? and Hyper?

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mekomod51
Dirt Full Roller

Total posts: 42
posted February 03, 2005 07:07 AM  
IMO if buy the forged you will spend more but you will have very little problems at all. Also they are stronger and much more forgiving for detonation.

right now for a race motor I would not buy hyper or cast. too many racers are telling me that they are pulling the pins out of the piston.

With that being said IF you get the end gap right, which is vital to use cast or Hyper pistons and keep the RPM's in a resonable range you can run the hypers.

If you can afford it get the forged and forget about it.

[This message has been edited by mekomod51 (edited February 03, 2005).]

stockcar5
Dirt Forum Champ
Total posts: 578
posted February 03, 2005 07:49 AM  
best piston for the money i would say is a flat top wiseco pro tru. 400 bucks on e bay and that includes rings. by the time you buy the kb's and the gapless rings (which cost horsepower anyway) you'll be up in the 400$ range

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ss99
Dirt Maniac

Total posts: 120
posted February 03, 2005 10:06 AM  
Best value = Manley platinum series. Very light and $450 with manley rings from cnc motorsports.


[This message has been edited by ss99 (edited February 03, 2005).]

[This message has been edited by ss99 (edited February 03, 2005).]

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