vac advance question
Thread Starter
Le Mans Master
Joined: Sep 2002
Posts: 9,386
Likes: 0
From: 30 mins north of Charlotte NC
vac advance question
what is a good way to test to see if your vacume advance is working to the FULLEST it can work,,,,i dont mean just working, but working 100% :D
[Modified by Titanium Rat, 4:04 AM 10/7/2002]
[Modified by Titanium Rat, 4:04 AM 10/7/2002]
Thread Starter
Le Mans Master
Joined: Sep 2002
Posts: 9,386
Likes: 0
From: 30 mins north of Charlotte NC
Re: vac advance question (AlwaysWave)
how about the whole setup,,,,my terminology is wrong i think,,,,i meant how can i test my vac advance distributer to be sure she is working 100%,,,i know the dist is working good but the advancing part im not to sure about :confused:
[Modified by Titanium Rat, 4:38 AM 10/7/2002]
[Modified by Titanium Rat, 4:38 AM 10/7/2002]
Safety Car
Joined: Apr 2001
Posts: 4,795
Likes: 1
From: Regina Saskatchewan, Canada.
Re: vac advance question (Titanium Rat)
put a new one on...if your pressing the gas pedal down considerably less during acceleration then your problem is fixed. Get the right one though, not all advance units are calibrated the same. If not your car is more than likely to ping.
Thread Starter
Le Mans Master
Joined: Sep 2002
Posts: 9,386
Likes: 0
From: 30 mins north of Charlotte NC
Re: vac advance question (Stingy74)
but........thats what im trying to get around "buying a new tach"......anyone know of a way to test them.........it all seems loose and free moving but i have heard some people say theirs were free moving and they bought a new tach and the new tach made a world of difference.
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Re: vac advance question (Titanium Rat)
You can use a vacuum pump and a gauge to see how many hg" it take to start moving and how many it takes to get full travel. Of course you need to know what it is designed to do.
Instructor
Joined: Jun 2000
Posts: 235
Likes: 2
From: York pa
Re: vac advance question (Titanium Rat)
LArs had put together a paper on distributors and vacuum advance with a lisitng of numbers by application. I believe it is posted on the forum here. Try doing a search on distributors. I will look to see if I still have it on my computer
Instructor
Joined: Jun 2000
Posts: 235
Likes: 2
From: York pa
Re: vac advance question (Titanium Rat)
Here is the addres for the posting
http://forums.corvetteforum.com/zerothread?id=380885
Here is the paper
http://www.c3sharktank.com/tech2/Vac_Adv_Spec.doc
http://forums.corvetteforum.com/zerothread?id=380885
Here is the paper
http://www.c3sharktank.com/tech2/Vac_Adv_Spec.doc
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Safety Car
Joined: Aug 2001
Posts: 3,685
Likes: 202
From: Waterford Mi
Re: vac advance question (princeRed72)
By using a timming liight with the adjustable dial you can chart what your current advance curve is. By setting the accelerator at different rpm's and checking to se where the timming is. Do both with and without the vacuum hooked up. Compare your findings to the specs in any good repair manual will give you a good idea as to what is working and what isn't.
Drifting
Joined: Sep 2001
Posts: 1,427
Likes: 1
From: Boxford Mass
Re: vac advance question (Titanium Rat)
Won't your vacuum readings differ between Park vs. Drive?
Isn't this why your vac secondaries never open in your garage?
It seems like you would have to know the Hg when your vacuum advance kicks in (vacuum canister test previously mentioned) and the Hg under normal driving conditions and compare the two.
Isn't this why your vac secondaries never open in your garage?
It seems like you would have to know the Hg when your vacuum advance kicks in (vacuum canister test previously mentioned) and the Hg under normal driving conditions and compare the two.