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Author Topic:   How to tell????
Dirt Full Roller

Total posts: 52
posted April 15, 2002 10:36 AM
How do i tell if my alcohol engine is lean? My engine builder says you cannot go by reading the plugs, that you should read exhaust temps. How the **** was i supposed to know? Will this cause it to sieze a valve? and smack shut the plug?


Dirt Freak

Total posts: 467
posted April 15, 2002 12:28 PM
I'd suggest dealing with an engine builder who is more familiar with alcohol ! Yes , alky plug's are totally readable !!! I'd start taking your engine apart if you closed a plug and seized a valve . Odds are were too lean and you'll be missing the top ring land on the piston in the hole that closed the plug . You will also need to look for tuliped valve's ! At any time when you were racing , did the car seam to bog down for no reason ?? If it did , then you burned a piston .

Hendren Racing Engines
Rutherfordton , NC

Dirt Freak

Total posts: 458
posted April 15, 2002 02:03 PM
I will just add a few thoughts, was this a new motor and the first night? I would check all the valve guide clearances. Sounds like you used a shop that builds street car motors......the fit-up need to be a little more clearance for a race motor. The valve guides are honed to size, if all you have is a bent valve........the fit-up was not correct. If you have any part of the piston flaking off or burned off parts of that piston will get into the guide and stick the valve. You need to decide, was the valve stuck because of another problem or was the problem created from the valve being too tight in the guide?

Dirt Freak

Total posts: 298
posted April 15, 2002 07:11 PM
"bad" alcohol will also cause this problem been there done that

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