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Subject: "Vacuum advance for distributor on 1968 Spitfire" Archived thread - Read only
 
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lawyerowen
Member since Apr-18-09
1 posts (MGB Driver)
Apr-18-09, 03:09 PM (PST)
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"Vacuum advance for distributor on 1968 Spitfire"
 
   Pardon by ignorance by me, but my mechanic says I need a vacuum advance for the distributor, but not the distributor, for my Spitfire. I am a new member and not mechanically inclined. He is having the dickens finding this, Can this be obtained, and does anyone know where?

David


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  Subject     Author     Message Date     ID  
  RE: Vacuum advance for distributor on 1968 Spitfire Joe Curry Apr-18-09 1
  RE: Vacuum advance for distributor on 1968 Spitfire JohnZisslerteam Apr-18-09 2
     RE: Vacuum advance for distributor on 1968 Spitfire tonymrfixitteam Apr-19-09 3
         RE: Vacuum advance for distributor on 1968 Spitfire ajohnson38 May-03-09 4
             RE: Vacuum advance for distributor on 1968 Spitfire JohnZisslerteam May-03-09 5
             RE: Vacuum advance for distributor on 1968 Spitfire tonymrfixitteam May-04-09 6
                 RE: Vacuum advance for distributor on 1968 Spitfire ajohnson38 May-04-09 7
             RE: Vacuum advance for distributor on 1968 Spitfire Richard & Daffy May-05-09 8

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Joe Curry
Member since Oct-20-03
1328 posts (An "official" TTN Senior Wrangler)
Apr-18-09, 06:01 PM (PST)
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1. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #0
 
   If not for the Spitfire distributor, then for what? The only place on a Spit engine where you attach a vacuum advance is on the distributor.

That distributor should have the vacuum pot installed on it with a vernier adjustor to advance or retard the timing. If it does not have those, then I would suppose that someone has either removed them or replaced the entire distributor with another (different) one.

What type distributor is on the car? You should be able to tell by numbers stamped in the body or an ID tag on the unit.

Joe


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JohnZisslerteam
Member since Dec-19-01
1516 posts (An "official" TTN Senior Wrangler)
Apr-18-09, 10:17 PM (PST)
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2. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #0
 
Joe, I read this different. Owen is asking for a vacuum advance for the distributor, but he already has the distributor, and it is for his spitfire. Maybe I am wrong in this but thats the way I read it. Anyway Owen (I hope that is your name). You dont say what MK spit you have. That does make a difference in the type of distributor you you have. Dont worry about being a new member , we were all new members once. And as for not being mechanically inclined, where have I heard that before And we just love questions, and pictures. Maybe these scans will help in your quest. The pic of the dizzy (not the exploded diagram) is just to show you where the vacuum advance pipe comes from. (The brass bit on the left).
Questions ? keep 'em coming


Happy Spitting... John Zissler
(Webpage now available with Wiring Schematics)
http://fire.prohosting.com/johnziss/spit/index.htm (Email reply on my webpages is wrong. It was onetel.com now it is virgin.net) john.zissler@virgin.net

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tonymrfixitteam
Member since Dec-25-02
2633 posts (A TTN governor, governor)
Apr-19-09, 07:34 AM (PST)
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3. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #2
 
If the car has the stock Distributor (it there a mechanical drive cable to the Tachometer?) Then you may well be looking for an AC Delco Vac advance unit.
I have seen them on Ebay from time to time.
Heck, I may even have an old one laying around myself! but I fear the diaphragm was ruptured.

Oh, pardon my manners, WELCOME!

Tony M
74 Spitfire 1500
84 Toyota Pickup
03 VW Golf


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ajohnson38
Member since Aug-20-03
744 posts (TTN Power Member - a well respected man)
May-03-09, 06:28 PM (PST)
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4. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #3
 
   my two cents... Noone NEEDS a vacuum advance unless it's for some whacky emissions rule.

aaron

Aaron Johnson
#87 H-Prod Spitfire MkIV Southern Illinois Region SCCA
http://hpspitfire.servebeer.com


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JohnZisslerteam
Member since Dec-19-01
1516 posts (An "official" TTN Senior Wrangler)
May-03-09, 10:32 PM (PST)
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5. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #4
 
Hi Aaron, Are you saying that I can remove the vacuum advance pipe from my distributor ? If thats the case then why did they design it that way. By the way Aaron, we dont have those emission rules here in the UK. When we go for our yearly test the tester simply looks at the exhaust pipe and if there is excessive smoke he fails it. In the more modern cars he inserts an emission probe into the pipe and it reads out on a computer. Anyway back to the question, and you being a Spit racer will have a lot more inside information on Spit engines than me, so I will listen and learn.

Happy Spitting... John Zissler
(Webpage now available with Wiring Schematics)
http://fire.prohosting.com/johnziss/spit/index.htm (Email reply on my webpages is wrong. It was onetel.com now it is virgin.net) john.zissler@virgin.net


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tonymrfixitteam
Member since Dec-25-02
2633 posts (A TTN governor, governor)
May-04-09, 11:15 AM (PST)
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6. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #4
 
Quote
my two cents... Noone NEEDS a vacuum advance unless it's for some whacky emissions rule.

aaron


The oldest car I have owned was a 59 Triumph, the engine was fitted with vac advance. It was not fitted by Triumph to satisfy any emission laws (there weren't any) it was there to aid part throttle driveability and economy. Kind of like a crude attempt at a Mapped ignition that considered engine Load, as well as engine speed.
Racers do not have to worry about pulling away from traffic lights at at 1500rpm on a light throttle, or if the engine is operating efficiently/economically if they cruse at 2000rpm. In the real world, a little more ignition advance under light throttle/ low load conditions, can be a nice thing to have.

Tony M
74 Spitfire 1500
84 Toyota Pickup
03 VW Golf


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ajohnson38
Member since Aug-20-03
744 posts (TTN Power Member - a well respected man)
May-04-09, 05:33 PM (PST)
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7. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #6
 
   Funny thing about things that work off vacuum. It assumes a perfect running engine.

My parents had a 1946 chevy truck that the windshield wipers ran off a vacuum motor. ahhh...another story


Correct on the potential need to advance a little bit. Most of us with spitfire engines will see better performance by setting the timing around 10 btdc at idle with no vacuum and use a slightly lighter mechanical advance spring. Anything over 2500 rpm should be at full advance anyways. Hillman imp springs are pretty good replacement.

I can't remember what the total vacuum advance was...something like 8 degrees total? from a 2 atdc factory setting you'd want it.

aaron

Aaron Johnson
#87 H-Prod Spitfire MkIV Southern Illinois Region SCCA
http://hpspitfire.servebeer.com


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Richard & Daffy
Charter Member
1434 posts (An "official" TTN Senior Wrangler)
May-05-09, 01:01 AM (PST)
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8. "RE: Vacuum advance for distributor on 1968 Spitfire"
In response to message #4
 
LAST EDITED ON May-05-09 AT 01:09 AM (PST)
 
Quote
my two cents... Noone NEEDS a vacuum advance unless it's for some whacky emissions rule.

aaron



I think the Vacuum Retard was to help with meeting emissions standards, and was only used on US cars for certain years. Vacuum Advance is a good thing on a street car.

Richard


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