440 timing question
#1009657
06/08/11 10:05 PM
06/08/11 10:05 PM
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Joined: May 2005
Posts: 127 Missoula, Montana
ChadP
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OP
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Joined: May 2005
Posts: 127
Missoula, Montana
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New 440 engine build (30 over)...pretty mild (375 hp)...stock intake...Holly dp 750 , Mopar electronic ignition with vacuum advance. Cam is custom grind, but not real radical. What would you suggest to set the timing on this engine. Will be running pump gas (best in Montana is 91 octane). Heads are 906 with hardened seats. Four speed with 3.09 first gear - 2.74 rear.
'65 Coronet 500
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Re: 440 timing question
[Re: ChadP]
#1009661
06/08/11 11:19 PM
06/08/11 11:19 PM
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Joined: Jan 2003
Posts: 5,435 So Cal
Sinitro
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master
Joined: Jan 2003
Posts: 5,435
So Cal
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If you have the Mopar Electronic Distributor it has 10 degrees mechanical advance, all in by 2K RPM.. 10 degrees (distributor) x 2= 20 degrees (@ the crank), one should have about 12-15 degrees initial advance = 32-35 degrees total. Any more initial advance will likely be hard to start for the street. Just my $0.02..
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Re: 440 timing question
[Re: Sinitro]
#1009662
06/08/11 11:22 PM
06/08/11 11:22 PM
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Joined: Apr 2003
Posts: 495 PA--USA
70VERT
mopar
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mopar
Joined: Apr 2003
Posts: 495
PA--USA
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Quote:
If you have the Mopar Electronic Distributor it has 10 degrees mechanical advance, all in by 2K RPM.. 10 degrees (distributor) x 2= 20 degrees (@ the crank), one should have about 12-15 degrees initial advance = 32-35 degrees total. Any more initial advance will likely be hard to start for the street.
Just my $0.02..
So, if you were to set up initially with a timing light, you would set up at 12-15 deg BTDC with vacuum hose disconnected from dist???
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Re: 440 timing question
[Re: mopar346]
#1009666
06/09/11 11:39 AM
06/09/11 11:39 AM
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Joined: Jan 2003
Posts: 5,186 Wherever I am.
Junky
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Joined: Jan 2003
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Wherever I am.
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Quote:
Initial can be deceiving according to the idle speed, 36 total in by 3k mechanical advance. 31-33 if spraying.
Never thought of this before. What should the idle RPM be when setting timing?
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Re: 440 timing question
[Re: Junky]
#1009668
06/09/11 02:33 PM
06/09/11 02:33 PM
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Joined: Jan 2003
Posts: 5,435 So Cal
Sinitro
master
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master
Joined: Jan 2003
Posts: 5,435
So Cal
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Quote:
Quote:
Initial can be deceiving according to the idle speed, 36 total in by 3k mechanical advance. 31-33 if spraying.
Never thought of this before. What should the idle RPM be when setting timing?
Force the idle speed down.. As mentioned you want the RPM low enough enough so the mechanical advance has not yet kicked in.. Regarding total advance, running 91 octane and the proper plugs & carb jetting we have found the Mopar BB like 33-35 total degrees advance...
Just my $0.02...
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Re: 440 timing question
[Re: Sinitro]
#1009669
06/09/11 04:04 PM
06/09/11 04:04 PM
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Joined: Jan 2003
Posts: 5,186 Wherever I am.
Junky
master
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master
Joined: Jan 2003
Posts: 5,186
Wherever I am.
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Quote:
Quote:
Quote:
Initial can be deceiving according to the idle speed, 36 total in by 3k mechanical advance. 31-33 if spraying.
Never thought of this before. What should the idle RPM be when setting timing?
Force the idle speed down.. As mentioned you want the RPM low enough enough so the mechanical advance has not yet kicked in.. Regarding total advance, running 91 octane and the proper plugs & carb jetting we have found the Mopar BB like 33-35 total degrees advance...
Just my $0.02...
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