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Author Topic:   hypereutectic piston
Dusty5
Dirt Roller

Total posts: 22
posted November 27, 2005 03:40 PM  
Are hypereutectic piston a good piston for dirt track motors. i want to run 11 to 1 compression and 6500 to 7000 rpm.

i am looking at a kit with hyper. pistions at 9.3 with 64 cc heads.

johder
Dirt Maniac

Total posts: 125
posted November 27, 2005 04:20 PM  
not to be a smartallic here or whatnot...but you said you wanted to run 11:1 compression, and your looking at 9:1 pistons???? Anyhow yes. hypers are fine for a low budget motor. Dont spend 5 grand on a motor and put hypers on it no go forged.

b4racing
Dirt Forum Champ
Total posts: 639
posted November 27, 2005 07:09 PM  
just remember you get what you paid for. And hypers go kaboom!

johder
Dirt Maniac

Total posts: 125
posted November 28, 2005 04:26 AM  
not all hypers go kaboom

DJR22
Dirt Maniac

Total posts: 126
posted November 28, 2005 08:00 AM  
Anything can go kaboom! Keeping it under 7 grand, I'd go with the hypers.

------------------
-stand on it-

J3
Dirt Freak

Total posts: 201
posted November 28, 2005 11:46 AM  
quote:
Originally posted by b4racing:
just remember you get what you paid for. And hypers go kaboom!

Forged can go Kaboom too!! (Just not as easy)

rob66
Dirt Roller

Total posts: 13
posted November 29, 2005 09:17 AM  
i used a set of speed-pro h104cp pistons in my mod motor this year and turned it 7800 for 20+ hits and it held together fine but if you can afford it a set of srp pistons would be a little extra insurance. most engine problems are the result of not being put together properly,poor maintenance,and not tuned properly in my experience.

brabbit75
Dirt Full Roller

Total posts: 51
posted November 29, 2005 06:15 PM  
Double check all your clearances, make sure they are all within spec, make sure the motor is super clean when assembled, and I would try keeping hypers under 6500 RPMs, just for my own sake. If you don't let them fail, they should work fine for you.

jhswords
Dirt Roller

Total posts: 9
posted November 30, 2005 06:17 PM  
quote:
Originally posted by Dusty5:
Are hypereutectic piston a good piston for dirt track motors. i want to run 11 to 1 compression and 6500 to 7000 rpm.

i am looking at a kit with hyper. pistions at 9.3 with 64 cc heads.



they will hold up to the rpms but do not get the eng hot or they will come apart on you they just coast me a block rods pistons and cam shaft

PEwaste
Dirt Full Roller

Total posts: 43
posted December 01, 2005 11:14 AM  
Me and a friend ran Speed Pro's last year in our B-Mod Engines.

Both motors were 6" Rod motors, and the same piston in both motors. He has bounced off 7300 many nights, he ran a consistent 7000 all year, I ran a consistent 6800 all year. I had no problems, nor did he.

I have another motor that is 5.7" Rod with the cheaper Speed Pro Hyperutectic's in it, and ran it up to 6900 a few times in 04, mainly kept it in the 6300-6700 and never had a problem with them.

My Suggestion, They are a decent piston, but can break at any time. Don't drop a valve or they'll shatter. If you've got an extra $150 to spend on pistons, but don't want to dish out $500 plus, Keith Black makes a Forged Piston for around $399 I beleive. A friend ran them all year and burned one down at the very last race he ran this year. If you plan on keeping the motor for a few years, spend the extra on Forged, because a Hyperutectic in anything over 450HP Will only last a year to a year and a half.

JMO

"Xtreme12x"

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