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Author
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Topic: Blown Cleveland Pistons?
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32valveGT350
Gearhead Posts: 137
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 09-12-2004 09:47 PM
  
What pistons are people using in Blown Clevos? I've been looking and I can't find anything off the shelf with more than 13cc dish... This only gets me 8.2sh comp if i use a 0.078" felpro gasket and OC heads... I'm not particularly thrilled about using such a thick gasket.. I don't want forgies cos of the piston slap when cold, I intend to use this thing for close to daily driver and 12psi, 98 octane... Any Ideas? can I modify the KB Hyper dished pistons so they're more of a bowl than a cutout (if you know what I mean... tapered instead of stepped bowl)Thanks Guys!
Ben
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clevelandstyle
Gearhead Posts: 1189
From: Connersville, IN
Registered: Jul 2001
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posted 09-12-2004 10:45 PM
Let me get this straight.
You want to run 12 psi and 98 octain in a daily driver and you don't want to run forged pistons because of piston slap?  ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 408C 4V, best time to date is 10.50 best MPH 127
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32valveGT350
Gearhead Posts: 137
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 09-13-2004 02:30 AM
Yep. Basically.
98 Octane is available from about 2/3rds of the service stations here....
The other point is cost... Forgies down here = big$$
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kid vishus
Gearhead Posts: 6405
From: middle of NC
Registered: Oct 2000
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posted 09-13-2004 07:45 AM
12 psi + hyper pistons 
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Mpcoluv
Gearhead Posts: 1333
From: Charlotte NC usa
Registered: Apr 2001
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posted 09-13-2004 10:46 AM
Remember that the 98 octane you have down there is not the same as 98 octane here in the States.
I think your 98 octane = about 93 octane using the US (RON + MON)/2 method.
Look into water injection to control detonation.
You will need CUSTOM FORGED piston in my totally biased opinion.
Hypers are not so great in any power adder application.
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32valveGT350
Gearhead Posts: 137
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 09-13-2004 06:24 PM
I don't see what the problem is with running 12 psi on Hyper Pistons with 8:1 compression and a fairly mild 351? I mean, the riceboys all run waaay more boost and way more compression on cast pistons...
I'm only talking about a fairly mild setup, with EFI to keep the mixtures & spark under control. Yes, Water injection is on the list, but mainly for when I get on it....
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Mooney
Gearhead Posts: 1943
From: Marietta, Ga
Registered: Oct 2003
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posted 09-13-2004 06:32 PM
I'm no expert, but I've read many times that Hyper pistons don't like boost in excess of 4-5+ lbs. One guy said they shatter like glass after that
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clevelandstyle
Gearhead Posts: 1189
From: Connersville, IN
Registered: Jul 2001
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posted 09-13-2004 07:49 PM
There is nothing mild about 12psi boost. The horse power potential could easily be around 550-600hp on a "mild" 351. That's not to mention all the extra cylinder pressure and heat. Not the kind of environment for cast pistons.I won't even go into what the ricers are doing.  ------------------
Ben
Grabber Green '70 Mach I 351C 4V
Robbin Egg Blue '79 Fairmont 408C 4V, best time to date is 10.50 best MPH 127
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32valveGT350
Gearhead Posts: 137
From: Briz Vegas, QLD, Australia
Registered: May 2003
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posted 09-13-2004 08:48 PM
Yep, 500 rwhp is the target... it only works out to 100hp/litre, which is mild... and really, in terms of forced induction, 10-12 psi is mild...
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Fordwiser
Gearhead Posts: 429
From: Metamora, Illinois
Registered: Dec 2000
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posted 09-13-2004 10:35 PM
My opinion, I wouldn't use cast hypers in any performance engine, normally aspirated much less forced induction. If you're not getting the answers here that you want, maybe you should ask the ricers.
Roger
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grandestang
Gearhead Posts: 375
From: Lake Bluff, Illinois USA
Registered: Jan 2003
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posted 09-14-2004 09:36 PM
Hyper pistons will last forever (up to a certain boost level) until you get even the slightest hint of detonation. Once you get some detonation say goodbye to your pistons. If you run real low boost with hypers (no more than 8lbs) with a real rich tune to ward off any potential detonation than I think you could get a way with it for a while. But you will still have a ticking timebomb on your hands that will eventually blow.Paul ------------------
1970 Grande
H code 351W FMX 1998 SVT Mustang Cobra
Bright Atlantic Blue
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73STANG
Journeyman Posts: 82
From: Lincoln, NE
Registered: Apr 2000
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posted 09-15-2004 02:48 PM
I don't think I would push my luck with hyper pistons with 12 pounds of boost. I run the TRW off the shelf forged dished pistons with open chamber 4V heads. I run between 12 and 14 pounds of boost.
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