Re: vacuum advance
[Re: lewtot184]
#1679711
09/29/14 02:17 PM
09/29/14 02:17 PM
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Joined: Jan 2003
Posts: 75,088 A Banana Republic near you.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,088
A Banana Republic near you.
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Quote:
3/32 allen wrench. turning the screw clockwise reduces the spring tension, counter clockwise increases tension. less tension means less vacuum to open the unit.
^^^ this , you can't limit the amount of advance by turning the screw only the speed it comes in.
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Re: vacuum advance
[Re: dodgeboy11]
#1679715
09/29/14 10:31 PM
09/29/14 10:31 PM
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Joined: Nov 2013
Posts: 97 Florida
johnmilner
member
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member
Joined: Nov 2013
Posts: 97
Florida
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Quote:
Open chamber, 440. 38 degrees total with welded slots, heavy spring removed. Rattle goes away when throttle is pressed further or backed off. It might make more power with more timing, but I'm not going to check, runs exceptionally well with 38. Thanks for everyone's input, I appreciate it.
put heavy spring back in there, that light throttle stumble will go away.
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Re: vacuum advance
[Re: dogdays]
#1679717
09/30/14 02:59 AM
09/30/14 02:59 AM
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Joined: Feb 2007
Posts: 1,025 Las Vegas, NV
dodgeboy11
OP
super stock
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OP
super stock
Joined: Feb 2007
Posts: 1,025
Las Vegas, NV
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Quote:
38 is where it's supposed to be, vacuum advance off and plugged. That's the most referenced number for stock bigblocks.
R.
This one saw dyno time. KB flat tops, .007" out. Ported 452's, had a torker II, holley 750 hp'ish. 1.6 rockers and a tq50 erson cam. 485hp, 507 tq. 38 degrees timing was all I had time to test, had to pull off dyno due to a leaking rear main and no time to retest.
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Re: vacuum advance
[Re: dodgeboy11]
#1679719
09/30/14 10:16 AM
09/30/14 10:16 AM
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Joined: Jun 2008
Posts: 3,916 usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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Quote:
Quote:
38 is where it's supposed to be, vacuum advance off and plugged. That's the most referenced number for stock bigblocks.
R.
This one saw dyno time. KB flat tops, .007" out. Ported 452's, had a torker II, holley 750 hp'ish. 1.6 rockers and a tq50 erson cam. 485hp, 507 tq. 38 degrees timing was all I had time to test, had to pull off dyno due to a leaking rear main and no time to retest.
what i'm seeing here is no quench, and high cylinder pressure. I doubt juggling the timing is a cure if the intent is to run on pump gas. I don't agree that 38 degrees total is always the best. to many variables; such as combustion chamber design, plug location, quench vs no quench, rod ratio, etc.
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