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Author Topic:   Cam question - vacuum rule
Morpheus
Member
posted June 16, 2003 01:24 AM
I have the same question. In my experience, if you go much larger than 230 @ .50 and 110 lobe sep, you're pushing the vacuum limits. (1600 @ 1000)
The same camshaft may pull more vacuum in one engine than it will in another. Compression has alot to do with it.


30rulz
Member
posted June 16, 2003 06:32 PM
the midwest motorsports tech told me if you have a vac rule not to consider a solid lift cam. but if you find one let me know


06Racing
Member
posted June 19, 2003 10:40 AM
This Crane cam worked for us #113841 238/248 480/500 114. It pulled 16 to 16 and 1/2 @ 1000 with a locked distributor Anyway it worked with our setup ..


rico 08
Member
posted June 19, 2003 09:40 PM
Crane makes very good vacuum cams,notice the above cam had 114 lobe center,that's why it pulled vacuum.


BayouGent
Member
posted June 20, 2003 12:23 AM
Hey 06, just curious. What did ya'll have the adv. timing set at? Also is that a 350 or a 400. I know it's usually easier to pull vacuum with a 400.


Mell00
Member
posted June 20, 2003 02:16 PM
Yes i use lobe center as a slang,i got sick of explaining it so i just say it the way they want to hear it.


06Racing
Member
posted June 20, 2003 08:06 PM
Bayougent It was a 350 engine and the total timing was 36 we set the cam up at 4degree advance


Mell00
Member
posted June 21, 2003 08:51 AM
I can definatetly understand that rico


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