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Fried! ls/vtec

Old 09-20-2009, 07:28 PM
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Default Fried! ls/vtec

Well i built this ls vtec for a customer about 2 months ago. Car ran very strong.

b18b block
itr pistons
b16 head (stock)
gsr cams
arp studs
cometics hg

Anyways it ran great, had strong top end. He still wanted more just b/c i built a high compression b20/vtec that stomped him, it belonged to his bestfriend. He got msd ignition put on and then took it to the dyno. They ran the car about 10 times on the dyno and got 190whp before it made a giant hole in a piston. They tell him the HG was on backwards and thats why it blew up. Bunch of BS. Well he got it to me and i took it apart today. HG looks brand new, no leaks. #3 cylinder has a giant hole and there is pieces of head on all the other pistons. If you ask me i think he took the timing way to high for pump 93 gas.

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it also broke the retainer for that valve.
This was "Intense Motorsports" in Charlotte NC.
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Old 09-20-2009, 08:29 PM
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im no tuning expert but i would say that would be from valve float or too much timing niether would be your fault. def not the head gasket. do you know how high he was revving it and or if he had adjustable cam gears that they were ------- with.
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Old 09-20-2009, 08:30 PM
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he said 8200
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Old 09-20-2009, 09:01 PM
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is the head stock. that broken retainer was probably the cause for all that. which still isnt your fault becuase its impossible to install those wrong
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Old 09-20-2009, 09:24 PM
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but that still dont explain all the pits in the other combustion chabers.
head was stock
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Old 09-20-2009, 10:05 PM
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hmm thats odd, maybe something broke off and flew throught the thb?
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Old 09-21-2009, 04:11 AM
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ok that to me looks like pits from detonation alot of detonation. the pictures are kinda blury and the parts are oily but those marking loook just like these from what i can tell
http://autospeed.com/cms/gallery/art...0&a=107970&i=3
http://autospeed.com/cms/gallery/art...0&a=107970&i=2
to me your picture look similar to these does it look close to that in in person if so then that is detonation from elevated engine operating temperature, preignition, overadvanced ignition timing (spark knock), lean fuel mixture, spark plugs that have too hot a heat range for the application, low octane fuel, and even bad driving habits such as lugging the engine excessively with a manual transmission.

Last edited by turbof22a; 09-21-2009 at 04:14 AM.
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Old 09-21-2009, 07:11 AM
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Originally Posted by turbof22a View Post
ok that to me looks like pits from detonation alot of detonation. the pictures are kinda blury and the parts are oily but those marking loook just like these from what i can tell
http://autospeed.com/cms/gallery/art...0&a=107970&i=3
http://autospeed.com/cms/gallery/art...0&a=107970&i=2
to me your picture look similar to these does it look close to that in in person if so then that is detonation from elevated engine operating temperature, preignition, overadvanced ignition timing (spark knock), lean fuel mixture, spark plugs that have too hot a heat range for the application, low octane fuel, and even bad driving habits such as lugging the engine excessively with a manual transmission.
I have seen this before,so many times ..and you're right it's all the things you have side. i could'nt agree more. it's the dyno *** hole fault.
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Old 09-21-2009, 07:56 AM
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exactly what i thought. because the owner of the car even said that the dyno guy had to put colder plugs so he new he was detonating big time. no need for colder plugs unless he was spraying the ***** of that motor which he wasn't. detonating enough to make a whole in a piston though? possible? cause it looks like there a piece of the piston behind the mangled valve like the valve got caught in the whole.
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Old 09-21-2009, 08:09 AM
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forgot to mention the guy on the dyno was tuning the car.
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