RPM's/Cast pistons

**MERCing** · 03-08-2006, 07:57 AM

What's the max rpms that cast pistons can safely handle ????

**chad202** · 03-08-2006, 08:12 AM

**pyro** · 03-08-2006, 08:39 AM

6500 for sure, but most say up to 7000.

**allyfreak2** · 03-08-2006, 08:41 AM

this is a controversial subject. you will hear responses from 7000-8500+ depending on your application. if it's for a fishing motor then 7-7200 would be safe. just my opinion.

**T-REX** · 03-08-2006, 09:32 AM

this is a controversial subject.

I know several DSRA SS'rz that ain't even broke open thier motors in a yeer ov turn'in 9k, and river play'in on tha weekendz...I run a 2.5 for 3 yeerz, 8K+ before it broke a piston and ruined tha block.....I used cast pistyons in one ov my 2.0's, 10K+...2 races, it broke a skirt, punched a hole on tha motor!!!....Quess it reely dependz on how lucky a person U are!!

**MERCing** · 03-08-2006, 01:27 PM

interesting.....is there a particular brand that has a better track record than the others ????

**Chummy** · 03-08-2006, 01:57 PM

Depends on whose cast pistons you are refering to, I've turned mine quite higher than 6500 once or twice

**Dave S** · 03-08-2006, 06:40 PM

Chheeep but buy good slugs and sleep at nignt.

**David Borg** · 03-08-2006, 06:46 PM

Vertex pistons are quite good imo

**Ted Stryker** · 03-08-2006, 06:49 PM

Mercury warranties them to 6800..

I'm with some of these other guy's, I'd push them to 7-7200 if my tune was sharp... Anything over that and I'd by forged...

**us1** · 03-08-2006, 07:21 PM

Cryoed or not I wouldn't turn a 2.5 cast piston over 7000 very many times. 2.0L can go higher, the piston is much lighter. I have see 100s of cast pistons fall apart at high RPM. Either the shirt collapse or the wristpin rips out.

Cp · 03-08-2006, 08:16 PM

Originally Posted by Chummy

......I've turned mine quite higher than 6500 once or twice

Me too, Chummy. Point of fact, mine's not UNDER 6500 much. But these ain't Merc cast pistons either.

Hasn't this been beat silly already?

**Chummy** · 03-09-2006, 07:34 AM

Originally Posted by Cp

Me too, Chummy. Point of fact, mine's not UNDER 6500 much. But these ain't Merc cast pistons either.

Hasn't this been beat silly already?

Yep sure has, MERCing give me a ring if you like or pm, there are two motors with these "junky" pistons in them at my house.

**Tony Brucato** · 03-09-2006, 08:15 AM

Five out of six cast pistons will handle 9500 RPM for the life of the engine.

**T-REX** · 03-09-2006, 08:27 AM

Five out of six cast pistons will handle 9500 RPM for the life of the engine.

I bet Linda toll U that one

.....

Put cast pistons in a motor, turn it over 8K, and take bets on which one gives up first, and how big tha hole will be!!!!....wit 6 cyls, U could make enuff money ta buy anuther block, and sum good forged pistons!!!

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