Initial Timing on Blown Pump Gas SBC?

Old 05-12-2007, 10:15 PM
  #1  
alscoupe
Senior Member
SENIOR BUILDER
Thread Starter
 
Join Date: Apr 2007
Location: Mississippi Gulf Coast
Posts: 124
Default 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.
alscoupe is offline  
Old 05-14-2007, 06:34 AM
  #2  
billhendren
Senior Member
MASTER BUILDER
 
Join Date: Dec 2005
Location: Rutherfordton North Carolina
Posts: 192
Default

Whats your comp ratio and what fuel? Bill
billhendren is offline  
Old 05-14-2007, 12:49 PM
  #3  
margaritaman
Member
JUNIOR BUILDER
 
Join Date: Nov 2004
Location: Home of Bill and Ted
Posts: 92
Default

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
margaritaman is offline  
Old 05-14-2007, 02:10 PM
  #4  
billhendren
Senior Member
MASTER BUILDER
 
Join Date: Dec 2005
Location: Rutherfordton North Carolina
Posts: 192
Default

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
You may want to lock your advance in the dist and set the timing at 36 deg,with 8.5-1 comp you shouldn't have any problems starting the engine and the 36 deg at idle and low rpm really cleans up the engine.keep your same 1 deg per lb.Bill
billhendren is offline  
Old 05-15-2007, 04:30 AM
  #5  
alscoupe
Senior Member
SENIOR BUILDER
Thread Starter
 
Join Date: Apr 2007
Location: Mississippi Gulf Coast
Posts: 124
Default

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.
alscoupe is offline  
Old 05-15-2007, 07:25 AM
  #6  
mcracecars
Senior Member
EXPERT BUILDER
 
Join Date: Dec 2006
Posts: 272
Default

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.
mcracecars is offline  
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -