Re: Vacuum source for distributor?
[Re: Supercuda]
#2141327
08/26/16 03:16 PM
08/26/16 03:16 PM
|
Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 16,376
|
From Speedway Motors catalog: 5.There are no provisions for a vacuum advance line. Ford & Mercury engines 1949-1953 using stock distributors will need an alternative place to connect the vacuum line.
The real Stromburg folks just spent a mint to get the carb back into production, that one does have ported vacuum. So, why would they want to give tech advice to a clone?
I also found this: "The ported vacuum 97 base is also available separately if you already have a suitable Stromberg 97. See part No. 9514-VP, under Service & Restoration parts." Factory price is $149.
R.
Last edited by dogdays; 08/26/16 03:51 PM.
|
|
|
Re: Vacuum source for distributor?
[Re: 65rbdodge]
#2141477
08/26/16 08:53 PM
08/26/16 08:53 PM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way.
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.
|
|
|
Re: Vacuum source for distributor?
[Re: Supercuda]
#2141614
08/27/16 12:27 AM
08/27/16 12:27 AM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way. or you could just tap in to the intake manifold and run manifold vacuum.
Fastest 300
|
|
|
Re: Vacuum source for distributor?
[Re: Crizila]
#2141683
08/27/16 01:39 AM
08/27/16 01:39 AM
|
Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
|
About to go away
Joined: Sep 2007
Posts: 14,889
up yours
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way. or you could just tap in to the intake manifold and run manifold vacuum. Not without issues.
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.
|
|
|
Re: Vacuum source for distributor?
[Re: Crizila]
#2151683
09/10/16 03:45 PM
09/10/16 03:45 PM
|
Joined: Oct 2007
Posts: 3,876 Oregon
hooziewhatsit
master
|
master
Joined: Oct 2007
Posts: 3,876
Oregon
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way. or you could just tap in to the intake manifold and run manifold vacuum. Yep, I just did that in my truck to get more timing at idle. So far it's working great. You need to make sure that the vacuum advance kicks in below whatever vacuum you have idling in gear (if automatic), and make sure that your total timing is good. I can go into more detail if there's interest.
If you ever find yourself in a fair fight, your tactics suck.
|
|
|
Re: Vacuum source for distributor?
[Re: hooziewhatsit]
#2152154
09/11/16 09:18 AM
09/11/16 09:18 AM
|
Joined: Jan 2003
Posts: 10,537 Freeport IL USA
poorboy
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 10,537
Freeport IL USA
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way. or you could just tap in to the intake manifold and run manifold vacuum. Yep, I just did that in my truck to get more timing at idle. So far it's working great. You need to make sure that the vacuum advance kicks in below whatever vacuum you have idling in gear (if automatic), and make sure that your total timing is good. I can go into more detail if there's interest. OK, so what am I missing here? If you have all the vacuum advance "in" at an idle, when the motor's vacuum is at its highest point, when you step on the throttle, and the vacuum drops, won't you get a decrease in the ignition timing at a point the timing should be advancing? A ported vacuum has little vacuum at idle, and as the throttle opens, the vacuum increases, which causes the vacuum advance to advance the ignition timing, as it was intended to do. Have things changed since I was in auto classes in the early 70s? Gene
|
|
|
Re: Vacuum source for distributor?
[Re: poorboy]
#2152252
09/11/16 12:08 PM
09/11/16 12:08 PM
|
Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
|
master
Joined: Oct 2003
Posts: 7,506
Az
|
Because they had info online on how to add ported vacuum to a 97 before they started making them that way. or you could just tap in to the intake manifold and run manifold vacuum. Yep, I just did that in my truck to get more timing at idle. So far it's working great. You need to make sure that the vacuum advance kicks in below whatever vacuum you have idling in gear (if automatic), and make sure that your total timing is good. I can go into more detail if there's interest. OK, so what am I missing here? If you have all the vacuum advance "in" at an idle, when the motor's vacuum is at its highest point, when you step on the throttle, and the vacuum drops, won't you get a decrease in the ignition timing at a point the timing should be advancing? A ported vacuum has little vacuum at idle, and as the throttle opens, the vacuum increases, which causes the vacuum advance to advance the ignition timing, as it was intended to do. Have things changed since I was in auto classes in the early 70s? Gene Without making this too complicated, the only real difference between ported and manifold vacuum is at idle - and you know what that is. When you mash on the throttle, all vacuum pretty much goes away and you are just running on the mechanical advance built in to the distributor. At cruise, you have about the same vacuum advance ( ported or manifold ) added to the mechanical advance. Your engine is under minimal load at cruise and the additional advance of both mechanical and vacuum will make best fuel mileage. Total for both at cruise should be in the 50 degree range ( about 35 for mechanical and 15 for vacuum ). These are "approximate" #'s. Altitude, DA, and many other engine factors come in to play here.
Fastest 300
|
|
|
|
|