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Idle with comp cam

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Old 01-30-2007, 06:28 PM   #1
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Idle with comp cam

about rpm should my truck idle at ??? i got these off of the comp site
---------------------------------------------------------------
Comp cam
CS XE284H-10
----------------
intake exhaust
valve adjustment 0 0
gross valve lift .507 .510
duration at .006
tappet lift 284 296

valve timing at .006 open close
-------------------------
intake 36 68
exhaust 82 34

duration at .05 240 246
lobe lift .338 .34
lobe separation 110 degree

these specs are for the cam installed at 106 intake CL

---------------------------------------------------------------------
im just wondering what RPM i should set my idle at.... my 350 includes...flat tops...441 heads...Edelbrock RPM air gap intake...heddman headers...edelbrock 650 carb...HEI with MSD ignition module with vacuum advance.. thanks
Old 01-30-2007, 06:45 PM   #2
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Re: Idle with comp cam

mines a .488 lift comp cam and i am idling at 850 rpm in gear and about the same in park timming set at 10 degrees BTDC.
Old 01-30-2007, 08:00 PM   #3
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Re: Idle with comp cam

Quote: Originally Posted by sboxv8
about rpm should my truck idle at ??? i got these off of the comp site
---------------------------------------------------------------
Comp cam
CS XE284H-10
----------------
intake exhaust
valve adjustment 0 0
gross valve lift .507 .510
duration at .006
tappet lift 284 296

valve timing at .006 open close
-------------------------
intake 36 68
exhaust 82 34

duration at .05 240 246
lobe lift .338 .34
lobe separation 110 degree

these specs are for the cam installed at 106 intake CL

---------------------------------------------------------------------
im just wondering what RPM i should set my idle at.... my 350 includes...flat tops...441 heads...Edelbrock RPM air gap intake...heddman headers...edelbrock 650 carb...HEI with MSD ignition module with vacuum advance.. thanks

Numbers at .050 are wrong I believe.
Old 01-30-2007, 09:58 PM   #4
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Re: Idle with comp cam

Quote:
Numbers at .050 are wrong I believe
how do u figure that my .050 are wrong??? those are off of the comp site.. and 99.999% sure that is what it says on my cam card
Old 01-30-2007, 10:05 PM   #5
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Re: Idle with comp cam

Your #'s are right. Its a XE.

Should idle around 850-900 rpm with a lot of lope for your combo. Hope your either stick or have 2800 + convertor.
Old 01-30-2007, 10:29 PM   #6
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Re: Idle with comp cam

With a bonus of low vacuum for brakes....

Your cam is way way to big for your combination, now get a good set of heads and its a different ball game...

Last edited by SweetS10V8; 01-30-2007 at 10:30 PM.
Old 01-30-2007, 10:52 PM   #7
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Re: Idle with comp cam

yea i know my heads dont flow what the cam would like but my buddy had some 441 around that he would let me use.... i am planning on getting some AFR heads sometime this next summer... the truck is only for weekend warrior till this semester is up so this summer so AFR's are on the way
Old 02-01-2007, 10:42 PM   #8
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Re: Idle with comp cam

Quote: Originally Posted by SweetS10V8
With a bonus of low vacuum for brakes....

Your cam is way way to big for your combination, now get a good set of heads and its a different ball game...

like here again.... what does this have to do about rpm for idle... if you dont know its o.k. ... i do know about vacuum and heads... i am not made of money... i can't buy everything at once... so the 441 heads are a decent flowing stock head adn flow fairly well with some pocket porting...

so if you know so much abou everything what do u think the idle should be set at...???

Thanks Stunningman for the reply
Old 02-02-2007, 11:59 AM   #9
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Re: Idle with comp cam

The cam in my blown LT1 is similar to that one. Slightly different duration and more LSA, but it idles at 1k rpm. I hope you have a nice stall for that thing, and a vacuum canister for the brakes. Mine pulls about 8 inches on a 114 LSA.
Old 02-04-2007, 01:09 PM   #10
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Re: Idle with comp cam

900-1000rpm w/7-10" vacuum. I have an XE294 hyd.roller (242/248@.050) in a 383 and it idles at 900rpm w/9" vacuum. A flat tappett such as yours in a smaller engine should be rougher with less vacuum at comparable idle rpm..
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