What carburetor jetting as a starting point?
#1238650
05/24/12 12:15 AM
05/24/12 12:15 AM
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Joined: Apr 2009
Posts: 3,422 Toronto
mshred
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Hey guys, looking for a jetting recommendation as a starting point for the following combo (sorry if its a little long, copied it from another post) 360 LA roller block bored .030" over 3.58 stock stroke, Scat I beams, SRP flatops 10.25:1 compression RHS heads ported by Brian at IMM (291 cfm at .600 lift on the intake, 212cfm at .600 lift on the exhaust) Custom Comp Hydraulic roller cam spec'd by Brian at IMM- 108 lsa installed straight up, 240/248 duration at .050", 630/580 lift split Eddy RPM air gap intake, 750HP holley 1-5/8 headers, 3" exhaust dumped 4.10 gear dana 60, 28"x 12.5 ET streets, 4 speed I'll probably be shifted between 6600-6800rpms, not sure on leave rpm yet (two step) Carb is currently 74 primary jet, 80 secondary jet, with 35 squirters front and back- I think the car wanted more jet last year with the old combo, but I never got around to it....so what would you guys recommend as a starting point? Thanks!
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Re: What carburetor jetting as a starting point?
[Re: mshred]
#1238651
05/24/12 01:01 AM
05/24/12 01:01 AM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
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I Win
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Bend,OR USA
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Start with what you got, drive it at part throttle and check the plugs, adjust accordling Once you got it like you want that part then try WOT, look at the plugs and go from there BTW, is the Holley stock with all parts or modified some? If stock what list number including the dash # is it? I can look it up and post the stock jetting for you If stock I like to start with the stock jetting, put the power valve in it that it needs to idle in gear and go from there, adjust as needed
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What carburetor jetting as a starting point?
[Re: radar]
#1238655
05/24/12 09:18 AM
05/24/12 09:18 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
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Quote:
I think stock on a 750dp is 72/80 6.5pv
He needs to look up his carb number... they did vary
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Re: What carburetor jetting as a starting point?
[Re: Cab_Burge]
#1238657
05/25/12 12:26 AM
05/25/12 12:26 AM
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Joined: Apr 2009
Posts: 3,422 Toronto
mshred
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Hey all, thanks for the responses! First off, I will have to look up the number on the carb...If I remember correctly stock jetting was either 72/80 as mentioned, or 75/80, with a 6.5 pv and I think 28 squirters. Either way I will look it up tomorrow. I could definitely start where I am and jet up from there once I get to the track, but I figured if I could get a little closer before firing it up I would. The carb is absolutely stock, other than changing from pink pump cams to a blue one And yes, this is the new 365" that is going in the scamp....Fire up is only a few days away now, not much left to do to finish it up. Thanks for the help so far guys
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Re: What carburetor jetting as a starting point?
[Re: Mr.Yuck]
#1238662
06/01/12 01:51 PM
06/01/12 01:51 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
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I'd go up a couple just to be safe, but you probably aren't that far off.
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: What carburetor jetting as a starting point?
[Re: RobX4406]
#1238664
06/01/12 05:17 PM
06/01/12 05:17 PM
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Joined: Apr 2009
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Quote:
75 p 80 s
http://static.summitracing.com/global/images/instructions/hly-199r10319-1.pdf
LOL thanks Rob, your the man!
I thought that was the stock jetting, turns out I was right...Now, that being said, what does everyone think? Just start there, or jet up from now? Like I said before, im pretty sure last years combo wanted more jet, but I never got around to actually trying it with a busted dual feed line at the track.
As for squirters, 35's were the only size that killed the huge hesitation I had before with the stock squirters on tip in throttle
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Re: What carburetor jetting as a starting point?
[Re: mshred]
#1238665
06/01/12 05:40 PM
06/01/12 05:40 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
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Are you running a 1" open spacer under the carb?
Brian Hafliger
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