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I have a 253 in an LX TORANA, I have rebuilt this motor a few times now, its fairly stock with 40thou os bore a mild cam and standard crank and heads, but with new valves & springs I have replaced the cam each rebuild.
The Problem i have had, is after a month or so after each rebuild , i start to get Backfire through the carby, at around 2500 - 3000 rpm
as soon as this happens i chec the cam, and usually the cam lugs have worn a lot, not all of them, just 2 or 3 and never the same lugs.
i getting fed up !!!!!
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How do you run in your cams?
Do you uses new lifters each time?
Do you use any additives for cam run in?
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No , Not really., just take it easy for the first 100ks or so.
i HAVE REPLACED THE LIFTERS ONCE, AND NO HAVN'T USED ANY ADDITIVES
i HAVE :
CECKS SPRING TENSIONS
CHECKED VALVE DIMENSIONS AND SETS
CHECKED PUSHROD LENGTHS AND STRAIGHTNESS
CHECK CONDIT
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Rank: Guest
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You should ALWAYS put new lifters in with a new cam. You should also ALWAYS use a running in lube (also known as cam honey) on your cam and run the motor at a fast idle for about 20 mins when you first start it up.
There are some variations in opinions
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Rank: Member
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Like Qute basically said - failing to run the cam in (in some shape or form) is a major cause for lobe sheering/wearing.
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Why are you reading this, you should be looking up there^^
Joetech Tonner - coming soon! |
___________________
- HJ turbotonner looks and goes like a sneezing rhino on heat! - |
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