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TOP OF PISTON DRY

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WILLIAM B.

06-21-2002 20:28:11

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I 'm running 110 octain racing fuel in my tractor . I recently had the head off and didn't like the way the piston looked on top .It was brownish/ gray and looked very slightly pitted and very ,I mean very dry. Cylinder walls show more ware and vertical wear lines the first 3 inches than I think they should.compression ratio is at 10.7:1 . Looks like it needs some help with lubrication in the upper cylinder bore . Anyone else have this problem before and did you learn a fix for it. Pls. Advise wb

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Steve in N.J.

06-28-2002 19:11:19

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Re: TOP OF PISTON DRY in reply to WILLIAM B., 06-21-2002 20:28:11

William,
Just came across your question on racing fuel, and I to, like Jimmy in NC ran a drag car except I ran a dragster. Same compression ratio, except a small block Chevrolet. Sounds to me like she's pretty lean upstairs and she's scoring the cylinder walls a tad from the heat she generates from the hard load she's under. Like Jim says, drag race engines run at high rpms for short periods of time. When the heads were removed on our car, the pistons would show a greyish/gold color when the air was right and the injectors were dialed in on a good 8.60 pass. The weight & load & rpm range your engine is under makes a big difference! Retard the timing a tick and fatten up the fuel curve.. Usually, a clean piston top is a good sign of being to lean. Just my 2 cents...

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G Taylor

06-27-2002 06:54:44

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Re: TOP OF PISTON DRY in reply to WILLIAM B., 06-21-2002 20:28:11

As previous posts have stated she's running into detonation,which lean mixtures contribute to. The entire combustion chamber should be "clean" and not sooted up with unburned fuel. Try cooler plugs as long as she doesn't load up while waiting to pull. As for aviation fuel being "dryer", it often needs to be jeted richer than pump gas thats all.It's the cleanest gasoline out there with the best additive packages. Is designed for airplanes afterall.

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06-22-2002 13:08:27

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Re: TOP OF PISTON DRY in reply to WILLIAM B., 06-21-2002 20:28:11

if you have black smoke when you open throttle and a dry piston and some cylinder wear it could be excessive advance on the timing creating detonation which would certainly pitt the tops of the pistons. also how old is the fuel because if it has been stored a long time the racing fuel blends tend to seperate creating combustion problems. there is a top cylinder lube that is used to mix in alchohol because of its drying tendancies. am unfamiliar with the name of it but most fuel places in town that sell race fuel should have it so you shouldnt have a problem getting it, perhaps if you get your fuel at a race track they could tell you where to buy it. hope this helps and good luck

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G-MAN

06-22-2002 05:39:27

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Re: TOP OF PISTON DRY in reply to WILLIAM B., 06-21-2002 20:28:11

I think the racing fuel is a really dry fuel. It seems to me that I've seen guys on here mention mixing in some Marvel Mystery Oil with the gas to add some lubricity. My two cents.

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JDGnut

06-24-2002 19:24:21

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Re: Re: TOP OF PISTON DRY in reply to G-MAN, 06-22-2002 05:39:27

G-Man most of the racing fuel has enough lube to it.. its the AV fuel that is very dry...

You could have too hot of a fuel for you octane or running lean, like others have stated..
JDGnut

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SEAMO

06-21-2002 20:50:22

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Re: TOP OF PISTON DRY in reply to WILLIAM B., 06-21-2002 20:28:11

William,I think you might be running on the lean side of mixture. What model of tractor is it? Have you run any additives?Pitting maybe water? Earl

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puller

06-22-2002 08:34:44

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Re: Re: TOP OF PISTON DRY in reply to SEAMO, 06-21-2002 20:50:22

It's a M FARMALL . Tractor puffs a bit of black smoke any time you crack the throttle . Spark plugs look good . Haven't had any water problems and surely it wouldn't be getting water in all 4 cylinders and the same amount of water in each one. All of them look the same .I guess I will go with some type oil of some kind in the gas . I wonder what the race car people do . they run this stuff a whole lot more than us Tractor pullers do . We only run these motors a few minutes at a time .They run thiers a whole lot harder and longer than we do . It only takes a few soconds to cover 2-300 feet in 4th gear @ 2500 rpm's.

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TimC

06-24-2002 06:25:00

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Re: Re: Re: TOP OF PISTON DRY in reply to puller, 06-22-2002 08:34:44

If it shows a faint hue out the stack under load it might be ok. When you crack the throttle and get a puff of smoke then it could be wash down from the intake getting dragged into the chamber.

If the cam was ground wrong it might run lean at no fault of the carb. Adjusting the valve differantly might help if there is to much scavaging goin on.

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Jimmy in NC

06-23-2002 06:05:13

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Re: Re: Re: TOP OF PISTON DRY in reply to puller, 06-22-2002 08:34:44

Before children I use to drag race. I ran a IHRA Super Stock camaro. 468 cid big block with 14:1 compression. We used Cam 2 113 octane racing fuel.
I never had the problem with dry pistions. The tops of the pistions colored even. Our motor only ran hard at the most 10 second in the 1/4 mile. It sounds to me like your timing is too far advanced when the motor luggs down. Or your running it to lean.

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