Unreadible Timing mark ..need help
March 19th, 2011, 10:19 AM
#1
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Join Date: Aug 2009
Posts: 114
Unreadible Timing mark ..need help
I have too much paint on the timing marks.
Could someone name A,B,C, and D.
Also, .. This is my timing while running.
Is it advanced or retarded?
The car runs good.
Homestar -------- Thank-you!
Mytiming.jpg
Could someone name A,B,C, and D.
Also, .. This is my timing while running.
Is it advanced or retarded?
The car runs good.
Homestar -------- Thank-you!
Mytiming.jpg
March 19th, 2011, 10:44 AM
#2
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Join Date: Sep 2010
Location: Shorewood, Il.
Posts: 3,057
By your sketch, your timing is advanced, but your vacuum advance is probably connected, bringing it off the scale. Remove and plug the hose.
Take a piece of sandpaper to the tab to confirm, but I believe C is O, to the left is 4 degree advanced increments, to the right, retarded!
A spray of carb cleaner would also remove the paint.
You should have more mechanical advance than a couple degrees - check the weights and springs under the rotor, to see if they're free - clean and lubricate!
Take a piece of sandpaper to the tab to confirm, but I believe C is O, to the left is 4 degree advanced increments, to the right, retarded!
A spray of carb cleaner would also remove the paint.
You should have more mechanical advance than a couple degrees - check the weights and springs under the rotor, to see if they're free - clean and lubricate!
Last edited by Rickman48; March 19th, 2011 at 10:47 AM.
Thx!
March 19th, 2011, 12:52 PM
#4
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Join Date: Aug 2009
Posts: 114
I checked it.
At idle, it makes sense there is no change.
The vacuum advance hose is connected to the ported vacuum at the base of the carburator. ( No vacuum at idle) Although I did undo the vacuum advance hose to verify.
With the hose off 3000 RPM is also appears the same. Mechanical advance must be huge and I may have a problem with the vacuum advance.
I will investigate further at some point, but its not at the top of the things to do list.
Thx again!
For people searching for info.
Ported vacuum at the base of the carb applies vacuum only when throttle is applied meant for vacuum advance distributors and anything else that requires it.
Manifold vacuum is pretty much constant except under acceleration the manifold looses vacuum.
I put a vacuum gauge to different ports today.
Avg manifold vacuum was 20 lbs.
Ported vacuum was zero and shot up to 30 lbs at 3000 rpm.
Pulling off one of the caps from an unused manifold port made the motor run rough yet vacuum readings didn't change hardly at all.
Measuring manifold vacuum doesn't look like a good way to confirm manifold vacuum leaks.
I hope I never have to chase one. If I did a smoke machine would probably make more sense?
.... ... The more you know
* * * * *
At idle, it makes sense there is no change.
The vacuum advance hose is connected to the ported vacuum at the base of the carburator. ( No vacuum at idle) Although I did undo the vacuum advance hose to verify.
With the hose off 3000 RPM is also appears the same. Mechanical advance must be huge and I may have a problem with the vacuum advance.
I will investigate further at some point, but its not at the top of the things to do list.
Thx again!
For people searching for info.
Ported vacuum at the base of the carb applies vacuum only when throttle is applied meant for vacuum advance distributors and anything else that requires it.
Manifold vacuum is pretty much constant except under acceleration the manifold looses vacuum.
I put a vacuum gauge to different ports today.
Avg manifold vacuum was 20 lbs.
Ported vacuum was zero and shot up to 30 lbs at 3000 rpm.
Pulling off one of the caps from an unused manifold port made the motor run rough yet vacuum readings didn't change hardly at all.
Measuring manifold vacuum doesn't look like a good way to confirm manifold vacuum leaks.
I hope I never have to chase one. If I did a smoke machine would probably make more sense?
.... ... The more you know
* * * * *
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