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Author Topic:   Cam question
strobe
Dirt Roller

Total posts: 23
posted April 21, 2005 06:13 AM  
Now out of the 22774 memebers here, I'm probably the least mechanically inclined one here, but my mechanic thinks turning on a computer involves a bottle of wine and candles. So I(the computer geek) am here to ask this question...Has anybody ever heard of installing a cam 14 degrees BTDC. Reason is we bought this really "lumpy" cam that is supposed to make the car go like a r**** ape.
But the people we bought it from didn't supply anymore info than the 14 degrees thing. Anyone...?

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Dirt track racing, cuz golf and baseball only require one ball.

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 21, 2005 07:45 AM  
That a lot of advance. I woudl think youd be better off with a cam that fits your needs better and installed closer to straight up.

leapinlizard
Dirt Freak

Total posts: 402
posted April 21, 2005 08:53 AM  
14 BTDC?

It doesn't make any sense. See, when advancing a camshaft you are moving the variable centerline or chosen point, usually the max lift, to a specified point or rotation, measured in crank degrees. This ensures the manufacturing tolerance stack up doesn't affect what you have chosen for timing points/events ocurring.

14 degree's in crank degre's almost a whole tooth off the gear. You would never never one that way on purpose.

Kromulous
Dirt Forum Champ
Total posts: 796
posted April 21, 2005 08:54 AM  
Is it an assymetric lobed cam? Sounds like something odd like that.

14* is pretty wild, got any way to get o hold of these folks and ask more questions?

KPLugnut
Dirt Forum Champ
Total posts: 1019
posted April 21, 2005 09:14 AM  
Perhaps they meant to say "install it so that the intake opens at 14BTDC"....

Just a thought...

KP

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 21, 2005 09:19 AM  
Sounds like maybe they got way too big of a cam and crutched it by advancing it that far to help the bottom end. But when you start moving stuff around that much it really affects piston to vavle clearance and overall really isnt ideal for valve timing. Like I said above youd be better off with a smaller duration cam that could be installed at 0-4* BTDC. Can you get more info on what make of cam it is and maybe what number it is or any lift/duration numbers. That would help a bunch.

What KP said would make sense....maybe thats what they meant.. i would so some more looking into it and ask some questions first before installing it.

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