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  #46 (permalink)  
Old 02-13-2013, 05:02 PM
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Well, bottlefed55gasser, if you want another opinion from somebody who's been there and done it, just sit back for a bit, I'm doing pretty much the same plan as you, KB hypers, 10.5:1 compression, 355, twin 58 mm T3/T4s, 8~10 psi, blow through, on E85. I'll let y'all know how it goes......

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  #47 (permalink)  
Old 02-13-2013, 07:53 PM
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Originally Posted by hcompton View Post
most turbo v8's with good compression and cam hardly have any lag. I mean before your foot touches carpet you got boost. My little honda civic will smoke the tires from a dead stop without reving the engine. as soon as the turbo gets a load its making boost. Older cars had lag issues from very low compression engines. With a 300 v8 and a turbo to push it above the 500 mark you will still get the 300 hp and all the idle and off idle power you had before the turbo. The same is not really true for the superchanger. the supercharger kills all your low end power so you get less to begin with and less over all. now the low end is working good by 1500 rpm but so are properly sized turbos. But with SC there is a big fat section in the middle where most cars live that is great. I feel you are both right.
my wife had a Saturn Sky Redline, I have a Ram 2500 Cummins and a buddy had a 03 EVO making 350 hp to the ground each and every one of them had HUGE lag compared to the 03 Cobra I traded in on the Ram with it's positive displacement supercharger.. On the Cobra, since I was over spinning the OEM Eaton to about 15 psi of boost, as soon as I hit the throttle, there was all that glorious torque available at any RPM below about 5500 (it started tapering off above that, because the Eaton being a roots blower isn't that efficient at high rpm)
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  #48 (permalink)  
Old 02-13-2013, 11:56 PM
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The lifted ring lands are telling you something.
You guys can make up all the BS theory you want and blame the piston.
The rings butted. The only way the ring lands lift like that is from the top rings locking against the cylinder wall.. A clear effect of detonation. Lack of octane. User abuse.

plus KB's need bigger top ring gaps.
I can tell from the failure the ring end gaps were too small.
Its obvious you did not read or believe the directions on ring end gap.
and the fuel was crap.

Nothing wrong wth the pistons. Its the fool behind the wheel.

The forged pistons will fail too. Just takes longer and fails differently
(Severe ring /cylinder bore scuffing or the piston brakes. Th result is the same.

Put good gas in the tank that will not knock and you won't hurt pistons.

Thats what happens when yopu run12.5:1cr on pump gas.

If you 're going to build a engine and operate it on crap gas with your head up your *&^^ don't blame the piston.

Last edited by F-BIRD'88; 02-14-2013 at 12:23 AM.
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Old 02-15-2013, 12:54 AM
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I agree with F-bird. At the shop we have built some very high hp turbo 4cyl's with hyper pistons and never had one fail,but we tune very on the safe side. Go alittle rich on the a/f and back timing off a few degrees from optimum and give it a chance just in case you get a bad run of fuel.

I personally don't like the kb hyper's. any time we set up an engine for a customer who just HAS to have them we run the ring gaps 0.004-0.005 over what kb says to set them at just for extra insurance. those pistons are know for having rings problems if not just right.
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Old 02-15-2013, 07:46 AM
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even if you run the good gas if the mixture is too lean you still burn the pistons , i seen one where a injector malfunctioned it looked like they burned it down with a blowtorch down the side all the rings and the skirt melted clean in half

turbo's are a little more forgiving as they come intoo boost later at a higher rev , the NA high compression motor runs on the edge of detonation all the time
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