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Re: vacuum advance [Re: hooziewhatsit] #1226868
05/05/12 08:38 PM 05/05/12 08:38 PM
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
R
Rick_Ehrenberg Offline
top fuel
Rick_Ehrenberg  Offline
top fuel
R

Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Just remember that any detonation you can hear is very bad.

If you really get "into" the tuning thing, you'd be amazed how much light-throttle advance you can run, and how lean you can go, too. The only potential problem is rotor phasing causing misfire. That's why DIS / COP ignition is so great.

Rick
Re: vacuum advance [Re: Rick_Ehrenberg] #1226869
05/05/12 09:16 PM 05/05/12 09:16 PM
Joined: Feb 2006
Posts: 969
OH--IO
3
360904 Offline
super stock
360904  Offline
super stock
3

Joined: Feb 2006
Posts: 969
OH--IO
whats the lowest number you can get a vacuum advance in? my car only has between 7 and 8 of vacuum at idle.
Re: vacuum advance [Re: 360904] #1226870
05/05/12 09:37 PM 05/05/12 09:37 PM
Joined: Jun 2008
Posts: 3,916
usa
L
lewtot184 Offline
master
lewtot184  Offline
master
L

Joined: Jun 2008
Posts: 3,916
usa
Quote:

whats the lowest number you can get a vacuum advance in? my car only has between 7 and 8 of vacuum at idle.

i've gotten them to start opening around 4 inches. they are adjustable.
Re: vacuum advance [Re: 360904] #1226871
05/05/12 09:41 PM 05/05/12 09:41 PM
Joined: Jan 2007
Posts: 7,664
IN
A
ahy Offline
master
ahy  Offline
master
A

Joined: Jan 2007
Posts: 7,664
IN
Under light cruise, higher RPM with small throttle opening increases the vacuum significantly. Your 7-8 will likley be in the teens at cruise speed. That's when you need the vacuum advance.
Re: vacuum advance [Re: ahy] #1226872
05/05/12 09:58 PM 05/05/12 09:58 PM
Joined: Feb 2006
Posts: 969
OH--IO
3
360904 Offline
super stock
360904  Offline
super stock
3

Joined: Feb 2006
Posts: 969
OH--IO
i think the one on my distributor now is a 8.5 does that sound right? I will have to hook it up and see what happens.
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