I was down at the shop this weekend doing some cleaning and happened upon a box from Nebraska. Inside was a couple pistons I have abused over the years with nitrous.

Pic 1:



Piston on the left was my first kill. Piston on the right was #2. Both renditions of the motor had been 12.00@108+.

Both failures were caused by a tune-up that was fuel rich. It is a popular misconception that fuel rich will not hurt anything. That is only partially true. Too much fuel will collect in the top ring land and when it ignites it will push the top of the land up. This is one area where forged pistons do make a little difference. Forged will take longer for the piece to break off, but it will break off eventually. These pistons are the KB hyper 2.2 turbo slugs. Cast and hyper pistons will break the land off faster than a forged will. Make no mistake, even a forged piston with the land pushed up is junk.



Closer view of the land broken off.



Piston #1 also had this damage from making a pass with the nitrous on after breaking the land off. Piston #2 did not have this because it broke after I crossed the finish line and was coasting. Yes, the damage occurred AFTER the throttle was closed. That is a mark of a way fuel rich tune-up.



Piston #1 again. Myth: Nitrous will cause hyper pistons to shatter. No, but they will split in half if you spray a damaged piston. Mike found this when he took the rings off. Piston fell apart off the wrist pin.



There is a groove burnt in where the spray was on after the initial damage. Nitrous will act like an acetylene torch if given a chance.

Final myth: Forged pistons will hold up better than cast of hyper. Maybe, IF you are breaking stuff from sheer horsepower overload, but forged pistons will not hold up to a poor tune-up any better than cast or hyper.

When nitrous (or any boost) is good, it's great. When it's bad, it's real bad in a hurry.

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Official Cookie and Mater Tormentor.

Your My Boogie Man, how fast do you want to go. How much money do you have. Speed costs . I know what your asking did he fire five times or six but you have to ask yourself do you feel lucky, Well do you punk ,Possum









It Aint Over Until I Win

Dang!! Zilla, how many bicycles did you go through when you were a kid?

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66 Lil' Red Piggie Valiant (Mater Crusher) - Thanks Zilla!!!!! 72 Demon (Number 1 Son's)

3

I have had over 30 motorcycles though.

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Official Cookie and Mater Tormentor.

slantzilla what kind of shot were you running when this happened

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1973 plymouth duster 225 slant six .30 over, erson 270 cam, 9.5 to 1 compression, big valves, headers, and a holley 4 bbl
http://cardomain.com/ride/3135091

hey that thing got a hemi? naw its just a slant six

Both were in the area of 175.

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Official Cookie and Mater Tormentor.

might have been the problem?

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1973 plymouth duster 225 slant six .30 over, erson 270 cam, 9.5 to 1 compression, big valves, headers, and a holley 4 bbl
http://cardomain.com/ride/3135091

hey that thing got a hemi? naw its just a slant six

Not necessarily. The direct problem is excess fuel collecting in the top ring land and igniting after shutdown. The runs themselves were pretty clean.

For the record though, 175 is right on the edge of disaster in a Slant anyway. That seems to be right aboot where head gaskets go bye bye too.

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Official Cookie and Mater Tormentor.

sounded a little much for a slant

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1973 plymouth duster 225 slant six .30 over, erson 270 cam, 9.5 to 1 compression, big valves, headers, and a holley 4 bbl
http://cardomain.com/ride/3135091

hey that thing got a hemi? naw its just a slant six

For my next trick I am going to send my fogger to Monte Smith Race Cars and get it flowed, and a tune-up specifically for it. I want to launch on aboot 125 and ramp up to???. I can't say what I want to end up at. Mike has threatened once again to disown me if I try it.

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Official Cookie and Mater Tormentor.

Hope I get to see this hellwagon run this year!!

Lou

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Home of Slant6-powered fun machines since 1988

It goes in next weekend for starting on moving the firewall back. I have my fingers crossed that I can have it at Kearney.

My buddy that is doing the chassis/tin work is having me haul a van back from northern IN for him tomorrow. He owes me big now.

Besides, I think it will help progress that the car will fit him when it's done too. He's an inch taller than me.

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Official Cookie and Mater Tormentor.