Initial Timing on Blown Pump Gas SBC?
#1
Senior Member
SENIOR BUILDER
Thread Starter
Join Date: Apr 2007
Location: Mississippi Gulf Coast
Posts: 124
Initial Timing on Blown Pump Gas SBC?
I guess I'm getting CRS or something.
Anybody remember the best place to start?
Solid 355 small block with 2.02/1.60 cast iron fuelie heads. 12% underdriven 6/71 with dual 650's. MSD 6AL series. Got a retard box on the way. Best initial time set? Degrees retard per pound?
Thanx.
Anybody remember the best place to start?
Solid 355 small block with 2.02/1.60 cast iron fuelie heads. 12% underdriven 6/71 with dual 650's. MSD 6AL series. Got a retard box on the way. Best initial time set? Degrees retard per pound?
Thanx.
#3
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JUNIOR BUILDER
Join Date: Nov 2004
Location: Home of Bill and Ted
Posts: 92
Here is where I'm at just for comparison:
19 initial / 37 total. 1 degree per pound of boost retard.
383 / 8.5 static / aluminum heads 2.05/1.60 / 1:1 for 12 lbs on a 6-71 large bore / Demon 750s all on 111 octane. One step colder plugs.
My Demons love initial advance, more so than a comparable Holley.
Give the crew some more specifics and I'll bet you get some answers.
MM
19 initial / 37 total. 1 degree per pound of boost retard.
383 / 8.5 static / aluminum heads 2.05/1.60 / 1:1 for 12 lbs on a 6-71 large bore / Demon 750s all on 111 octane. One step colder plugs.
My Demons love initial advance, more so than a comparable Holley.
Give the crew some more specifics and I'll bet you get some answers.
MM
#4
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MASTER BUILDER
Join Date: Dec 2005
Location: Rutherfordton North Carolina
Posts: 192
Originally Posted by margaritaman
Here is where I'm at just for comparison:
19 initial / 37 total. 1 degree per pound of boost retard.
383 / 8.5 static / aluminum heads 2.05/1.60 / 1:1 for 12 lbs on a 6-71 large bore / Demon 750s all on 111 octane. One step colder plugs.
My Demons love initial advance, more so than a comparable Holley.
Give the crew some more specifics and I'll bet you get some answers.
MM
19 initial / 37 total. 1 degree per pound of boost retard.
383 / 8.5 static / aluminum heads 2.05/1.60 / 1:1 for 12 lbs on a 6-71 large bore / Demon 750s all on 111 octane. One step colder plugs.
My Demons love initial advance, more so than a comparable Holley.
Give the crew some more specifics and I'll bet you get some answers.
MM
#5
Senior Member
SENIOR BUILDER
Thread Starter
Join Date: Apr 2007
Location: Mississippi Gulf Coast
Posts: 124
Thanx guys.
9:1 on 91oct.
What I figured, planned on bringing in 28degs by 2500rpm total, then backing down 1deg/lb up to 7-8lbs boost, puts it back on the bottom of the 28 to 34 total range at " on the f'n floor mode.
9:1 on 91oct.
What I figured, planned on bringing in 28degs by 2500rpm total, then backing down 1deg/lb up to 7-8lbs boost, puts it back on the bottom of the 28 to 34 total range at " on the f'n floor mode.
#6
Senior Member
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Join Date: Dec 2006
Posts: 272
I have to agree with bill here, lock out the advance. These things go over 2500 rpm in an instant anyway so why fool with it. What I had on my old camaro... man I miss that thing.... put a switch to the ignition, get the motor spinning good, hit the switch, start everytime. Wheather or not it ran on all cylinders was another story. :shock:
Just my opinion, but I would go with about 32* total with the pump gas available these days.
If you go racing mix some race gas and sneek up on the timing, watch the plugs for signs of detonation.
Just me, but I dont put any faith in those retard boxes. Just something else to go wrong on race day. I would get rid of it myself, for the street, good pump gas, less timing, low boost. For racing, use race gas, more timing more boost.
Just my opinion, but I would go with about 32* total with the pump gas available these days.
If you go racing mix some race gas and sneek up on the timing, watch the plugs for signs of detonation.
Just me, but I dont put any faith in those retard boxes. Just something else to go wrong on race day. I would get rid of it myself, for the street, good pump gas, less timing, low boost. For racing, use race gas, more timing more boost.