Re: Moving up to Jesel
[Re: AndyF]
#33939
02/07/07 12:20 AM
02/07/07 12:20 AM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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what did you end up getting for a cam?
dont need all that much clearance for dyno work, especially if you have plenty of spring..
i had a 383 Chevy i was doing some cam testing with, and one of the cams i tried had about .035 intake/.050 exhaust clearance. no issues.
i know some of the SS guys routinely run around .030 clearance on the intake side.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Moving up to Jesel
[Re: AndyF]
#33945
02/08/07 10:50 PM
02/08/07 10:50 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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Posts: 14,514
So. Burlington, Vt.
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Quote:
When you talk about running 0.030 VP clearance is that with the valves lashed, or with the rocker tight against the valve tip when the cam is on the base circle?
i dont bother checking V/P clearance with zero lash......since thats not how the motor runs(unless its a hyd cam). i check everything with the correct lash.
so, to answer your question, i ran that 383 with that little amount of clearance.
what your seeing is part of the reason many of the longer duration BBC cams are put on wider LSA's.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Moving up to Jesel
[Re: AndyF]
#33950
02/11/07 07:25 PM
02/11/07 07:25 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
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So. Burlington, Vt.
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the test i would do......is compare the new Comp with another cam that has very similar seat to seat, and .050 numbers, and if possible.....similar .200 numbers....but with noticably less lift, to see if the big lift is really going to buy you anything in that application. and if it does....how much? in other words....does it justify the added expense and wear and tear of the really big springs that are required to be able to use that type of cam for "X" amount of added power??. as i had mentioned before, in that 383 SBC, going from .625 lift to .715 lift, while maintaining the seat to seat and .050 numbers of the 2 cams....showed no increase in power for the added lift. that motor was making about 1.56hp/ci. the test between the cams would be to try and determine which was more beneficial in that motor.....higher lift, or a higher discharge coefficient. Quote:
Any thoughts on the Crower 300R cam?
i'd expect that with the short duration and tight lsa.....it would make a pretty big number in the middle somewhere.....but probably not provide the kind of overall power curve someone building that kind of motor is going to be looking for.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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