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Author Topic:   cast pistons
gould
Member
posted September 05, 2004 03:33 PM
how much compression and horsepower can a cast piston take?

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racer17j
Member
posted September 05, 2004 09:22 PM
i wouldn't run um in a stock car motor 9-1is the max i'd push um think you'd be better off with a set of hypers for the money


outlawstock17
Member
posted September 05, 2004 09:28 PM
hypereutectics are cast.


mavrik82
Member
posted September 06, 2004 03:31 AM
just my opinion, but I wouldn't run cast or hypereutectic pistons in a race motor. I have seen alot of IMCA Mod motor go away with piston failures and when the piston goes away the rod does a heck of a job taking out the motor. A set of forged pistons for a small block is not very expensive and can even be had cheap used on the internet. If I was on a budget with a small block I would sooner use a cast crank or reworked stock rods and buy forged pistons. A friend destroyed 3 motors in 2 years using the hyper pistons. 2 were overheating, but that led to piston failure. I talked him in to forged and he has 2 HARD years on the new motor.


gould
Member
posted September 06, 2004 08:20 AM
im not asking which one to use, i wanna know what they can handle.

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Ego Racing
Member
posted September 06, 2004 08:42 AM
I have a friend who builds motors runs hyors in a drag motor with 200hp shot of nos and runs 11's in the Quarter mile. The biggest thing is get the bore done for the pistions. I know he uses more clearence than I do on my forged motors.


outlawstock17
Member
posted September 06, 2004 09:46 AM
i use hypereutectics in a 550 hp engine. 25 shows and counting...

oh yeah, it's 11:1...

[This message has been edited by outlawstock17 (edited September 06, 2004).]

gould
Member
posted September 06, 2004 10:53 AM
with the heads that i got, and the pistons that im asking about, i would be around 13 to 1. they are flat tops and have the steel reinforcements in the for the pins. i will probably be around 6500 rpm

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Wildside17
Member
posted September 06, 2004 11:42 AM
I would say you would be alright if using hypereutectics but may have to freshen a little more frequently. The hypers have come a long way in recent years.


dgb
Member
posted September 06, 2004 12:23 PM
I run a set of glass,i mean cast pistons,they are ohio brand and .400 dome comes out to 11.5-1,i never let it spin above 6500 and it's always fat on the jetting and a little conservative on the timing..bottom line they are fine they just leave no margin for error.


gould
Member
posted September 06, 2004 01:17 PM
now where talkin' thanks guys.

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Raz_900
Member
posted September 09, 2004 09:32 PM
I've seen 2 - 351W Fords and 1 - 350 Chevy that have pulled the pins out of cast (non-hyper) pistons in the 6000-6200 range. I wouldn't run a plain cast piston over 5500 for any length of time. Sealed Power/Federal Mogul hypers are a huge improvement for less than $100 extra.

Personally, I run KBs in everything I can. The only problems I've had are the ONLY 2 days I've every bought track fuel. Blew a hole through a piston each time (one time in 2001 and once in 2002) I haven't bought track fuel since and both cars have been fine.

iowatoolman
Member
posted September 09, 2004 11:06 PM
hypers will be ok if you watch your timing and are not pinging
but 13 to 1 is awfully high for hypers i wouldn's go over 11 to 1 with them
i would think about forged if it fits into your budget

drive hard or drive home

racerman707
Member
posted September 10, 2004 05:24 AM
Check out Probe pistons. They are very good.


Ego Racing
Member
posted September 10, 2004 09:56 AM
We had a 406 that we used Keith Blacks in when building it we put the wrong heads on the block, The car ran and was bad fast. After three weeks the crank flange broke/twisted off. We put the other motor we built in and it was SLOW!! when we pulled everything apart we found the large chamber heads on the flat top motor and out smalls on the pop up. We figured the KB's were running in the area of 16-16.5=1 with racing fuel and turning 6800rpm. The block was bored and honed with the extra clearence needed for them. I have seen several with the tops pulled off and almost all were bored .030 and they just put the pistons in or they were running forged and used KB's on a freshen.


Scoot
Member
posted September 10, 2004 07:12 PM
Raz what do you run for fuel if your not running track gas?

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Scoot
Smith Racing Team
870-365-5989


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