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Old 11-23-2004, 04:07   #1 (permalink)
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I've broken my motor on n2o (Long)

This comes as no suprise to anyone I'm sure. .060 over stock bottem end running n2o what was I thinking?!

I was trying really hard to make the ff heathcote day. My new trans had a few gremlins and had to be rebuilt again. Left me short of time but I managed to fit the new fuel setup for the n2o. Even managed to get a last minute dyno run on the Saturday morning to check everything was safe.

Ran it up several times it was making more and more power and still rich! I had to go so we left it there. On the last run the dip stick popped up and gave a little puff of smoke. Just blow by we thought, but I must have broken rings in number 8.

I had shut the bottle off so on the freeway I emptied the n2o in the line.(Read pressed the button) The van took off then made some unfamiliar noises then started blowing smoke. I pulled over check under the hood and oil out every orifice. So closed the hood and drove home on 7. I was calm, I knew this day would come, but it would have been nice to get one run down the quater man it felt strong.

Well I've pulled it down and I have not cracked the bore! I didn't even hole the piston! Ok there is a fair section of the ringlands in the sump and some broken chrome moly rings.

Gentlemen we can rebuild it! It's .060 up on it's second set of rings, what have I got to lose? I can get another piston the same. And I actually know how much n2o will hurt it, I'll just back it off a little and I'm sweet? Right?

Addicted to n2o me, pufft I could give it up anytime, honest. lol

Side bar, while checking the compression I'm up around 200psi ( except number 8, 0 psi) does this seem a little high to anyone?
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Old 11-23-2004, 04:37   #2 (permalink)
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Re: I've broken my motor on n2o (Long)

Thanks for the honest account Work Horse, I guess the writing was on the wall so to speak...

Good luck with the rebuild mate.

What do you reckon in HP is then a safe max for your set-up?
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Old 11-23-2004, 09:57   #3 (permalink)
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Re: I've broken my motor on n2o (Long)

Quote:
Originally Posted by Work Horse
This comes as no suprise to anyone I'm sure. .060 over stock bottem end running n2o what was I thinking?!
Ahhh, the power of positive thinking! They didn't split but I bet there was a bit of bellowing! Go you good thing.
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Old 11-23-2004, 17:33   #4 (permalink)
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Re: I've broken my motor on n2o (Long)

200psi is high but it aint a bad thing.

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Old 11-23-2004, 17:41   #5 (permalink)
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Re: I've broken my motor on n2o (Long)

just wonder how much n2o steve from redcliffe dyno was using in his 8.3 sec run on the weekend, not bad for a single carb clevo.
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Old 11-23-2004, 17:44   #6 (permalink)
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Re: I've broken my motor on n2o (Long)

Quote:
Originally Posted by Work Horse
Well I've pulled it down and I have not cracked the bore! I didn't even hole the piston! Ok there is a fair section of the ringlands in the sump and some broken chrome moly rings.
With broken rings on #8, you're likely to have scored the bore. At .060", you can probably sleeve it and rebuild it if the piston isn't damaged.

I'd hard block it, rebuild it and race the hell out of it. If you can't live with the hard block due to the usage of your vehicle, then you need to seriously consider building a racecar and not a daily driver.

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Old 11-23-2004, 17:45   #7 (permalink)
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Re: I've broken my motor on n2o (Long)

Workhorse, sorry to hear, but the positive must be the you only damaged a piston and not ventilated a conrod. Get it all back together, cause i loved watchin that van of yours fly down the Heathcote 1/4 mile.
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Old 11-23-2004, 17:50   #8 (permalink)
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Re: I've broken my motor on n2o (Long)

Hmm, rebuilt engine, new trans. Anyone else here thinking Workhorse may just up the shot a little to celebrate??? :s6:
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Old 11-23-2004, 18:00   #9 (permalink)
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Re: I've broken my motor on n2o (Long)

Nothing a decent set of rings and pistons wouldn't help.

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Old 11-23-2004, 20:09   #10 (permalink)
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Re: I've broken my motor on n2o (Long)

Stu,

Not good news. It was always a matter of time wasn't it? Ah well......

You got the basic feel of the gas and its pretty good isn't it

Pretty lucky it didn't score the bore, or split it

How much gas were you running? Or what was the final power figure??

What do you call rich?

There wasn't a reason why it happened? Your running a nitrous filter?

But there has to be a positive in all this......

Did someone mention forged?? lol

I'm glad your man enough to admit your addiction. Like me. It's not easy. But just don't give up. Don't let those do-gooders convince you that nitrous oxide isn't needed or under your control.

Remember......Rehab is for Quitters
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