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Downside to vacuum dizzy on street/strip car ?
#1866802
07/08/15 06:54 PM
07/08/15 06:54 PM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
OP
member
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OP
member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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I'm looking at replacing my Pro Comp mechanical distributor because the bearing is getting noisey with one from Firecore50.
Are there any disadvantages to using a vacuum advance dist on a street/strip car ? I drive my car as much as I feasibly can around town including 15-20 mile runs on the hiway.
67 Dart
440
10.4 comp
Old grind .509
OOTB sidewinders
RPM intake
750 DP Holley
TTI headers
3500 PTC
3.91 gears
275 DRs
Thanks
Last edited by 2734bbl; 07/08/15 06:55 PM.
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 2734bbl]
#1866826
07/08/15 07:31 PM
07/08/15 07:31 PM
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Joined: Aug 2007
Posts: 2,356
Kentucky
dfsmopars
top fuel
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top fuel
Joined: Aug 2007
Posts: 2,356
Kentucky
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For a street car vacuum advance is for me. For street I have no down side.
‘72 Charger, 5.9 Magnum, Tremec 5 spd., Pro-Touring
‘14 Big Horn, Quad Cab, 4x4, 1500
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 2734bbl]
#1866931
07/08/15 10:08 PM
07/08/15 10:08 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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tune the systems to get the most out of it & there's alot to be gained. initial/total/springs/can in that order
live every 24 hour block of time like it's your last day on earth
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 2734bbl]
#1867134
07/09/15 11:29 AM
07/09/15 11:29 AM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
OP
member
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OP
member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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Thanks for all your replies.
I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it.
Last edited by 2734bbl; 07/09/15 11:29 AM.
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 2734bbl]
#1867135
07/09/15 11:35 AM
07/09/15 11:35 AM
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Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it.
Too many reading "Hot Rod" magazine...
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: minivan]
#1867163
07/09/15 12:55 PM
07/09/15 12:55 PM
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Joined: May 2003
Posts: 6,562
Downtown Roebuck Ont
Twostick
Still wishing...
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Still wishing...
Joined: May 2003
Posts: 6,562
Downtown Roebuck Ont
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I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it.
Too many reading "Hot Rod" magazine... From 1966... Kevin
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 2734bbl]
#1867184
07/09/15 01:39 PM
07/09/15 01:39 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Thanks for all your replies.
I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it. Alot of iron headed engines built from the 60's to the 90's (no aluminum out there yet for most mopars) were built with open chamber iron heads and no quench. When these guys added alot of mechanical advance they were getting pinging at part throttle with the vacum advance hooked up as they could be seeing up to almost 60 degrees advance at part throttle about 3000 rpm. Problem was with iron heads and no quench and the cheap gas many people just unhooked the vacum advance to stop the pinging. But today with aluminum heads and quench and with custom cams to keep cyl press low enough for pump most can get away with 50 or more degrees at part throttle even on pump and of course at wide open throttle they only have the mech advance around 32 to 38. I saw that alot. As for me I got a great deal on a race dist with no vacum advance so I cant run one or I would if I had it. But my car runs good since I have alot of very fast mech advance but I could get better part throttle milage with a vacum advance as I would just have to tune it in. Also race cars dont use the vacum advance since they are mainly at full throttle most of the time and many saw that race cars did not use the vacum advance so they thought they would be faster without it. Ron
Last edited by 383man; 07/09/15 01:41 PM.
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: Twostick]
#1867215
07/09/15 02:44 PM
07/09/15 02:44 PM
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Joined: Jun 2008
Posts: 3,916
usa
lewtot184
master
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master
Joined: Jun 2008
Posts: 3,916
usa
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I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it.
Too many reading "Hot Rod" magazine... From 1966... Kevin can we get an amen here? i was in the '60's and we, as kids, were taught that a vacuum advance was a power loss; nonsense! glad i grew up, or sorta grew up.
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: lewtot184]
#1867307
07/09/15 05:47 PM
07/09/15 05:47 PM
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Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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I was just curious as I've seen a lot of vacuum distributors plugged or not present on a lot of cars and wondered at what point there is a reason to eliminate it.
Too many reading "Hot Rod" magazine... From 1966... Kevin can we get an amen here? i was in the '60's and we, as kids, were taught that a vacuum advance was a power loss; nonsense! glad i grew up, or sorta grew up. AMEN
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Re: Downside to vacuum dizzy on street/strip car ?
[Re: 383man]
#1867329
07/09/15 06:40 PM
07/09/15 06:40 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Alot of iron headed engines built from the 60's to the 90's (no aluminum out there yet for most mopars) were built with open chamber iron heads and no quench. When these guys added alot of mechanical advance they were getting pinging at part throttle with the vacum advance hooked up as they could be seeing up to almost 60 degrees advance at part throttle about 3000 rpm. Problem was with iron heads and no quench and the cheap gas many people just unhooked the vacum advance to stop the pinging. But today with aluminum heads and quench and with custom cams to keep cyl press low enough for pump most can get away with 50 or more degrees at part throttle even on pump and of course at wide open throttle they only have the mech advance around 32 to 38. I saw that alot. As for me I got a great deal on a race dist with no vacum advance so I cant run one or I would if I had it. But my car runs good since I have alot of very fast mech advance but I could get better part throttle milage with a vacum advance as I would just have to tune it in. Also race cars dont use the vacum advance since they are mainly at full throttle most of the time and many saw that race cars did not use the vacum advance so they thought they would be faster without it. Ron
Whole lotta words to say that some can't tune an engine. I drove my 64 300 with a warm 413 all across the US with vacuum advance. No aluminum heads, at the time I think only Koffel made them and those heads were overkill for anything with plates. So I ran 906 heads on my 413. Wiht minimal tuning it ran just fine on 93 octane.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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