Th350 vacuum line hook up
Index
- How much vacuum to shift a TH350?
- What are the specs of a TH350 transmission?
- Where do you hook up a vacuum line?
- Do you hook your distributor up to ported or full vacuum?
- How do you adjust the vacuum modulator on a GM TH350?
- How do you raise the shift points on a GM TH350?
- How much vacuum needed to shift properly?
- What happens if there is no vacuum in transmission?
- Where do you hook up the vacuum advance line?
- How do you hook up a pool vacuum?
- How to tell which vacuum hose is connected to which port?
- Where is the vacuum hose on a manual transmission car?
- Should I ported vacuum or full vacuum my engine?
- What should the vacuum advance be on a distributor?
- Should I port my vacuum to Max advance?
- What is the difference between “ported” and “manifold” vacuum?
How much vacuum to shift a TH350?
I just instaled a new th350. Guy at the tranny shop said it needs 16in. of vac to shift properly. my old tranny vacuum line ran to the carb. He said thats not good enough, need to run it to the distributer. I have msd dist no vac advance. so he says run it to the intake. I say okay.
What are the specs of a TH350 transmission?
Specs- 350 engine, Edelbrock Performer EPS manifold, Holley 4160, TH350 trans (rebuilt w/shift kit), 3.73 posi. I stopped at the transmission place that rebuilt my transmission about a year ago.
Where do you hook up a vacuum line?
In case you are still uncertain on where to hook up vacuum line: There is usually a port directly behind the carb. on one of the intake runners. If not there is the port on the bottom backside of carb. (usually for power brakes), or on the front of the carb. at or below the throttle blades. Just be sure it is manifold vacuum or full vacuum.
Do you hook your distributor up to ported or full vacuum?
My distributor is hooked up to full vacuum, not ported. You will not get good performance if you distributor is on the ported or timed vacuum source. It has to sense manifold vacuum. You cannot use the distributor line, because that is ported vacuum Click to expand... My distributor is hooked up to full vacuum, not ported.
How do you adjust the vacuum modulator on a GM TH350?
A minimum of 12″ Hg engine vacuum is required for proper operation. You can adjust the modulator with a small screwdriver. Turn the adjustment screw clockwise to raise shift points and counter-clockwise to lower shift points. B&M Vacuum Modulator for GM TH350/TH400 Automatic Transmissions ~ Part # 20234 on Amazon
How do you raise the shift points on a GM TH350?
Turn the adjustment screw clockwise to raise shift points and counter-clockwise to lower shift points. B&M Vacuum Modulator for GM TH350/TH400 Automatic Transmissions ~ Part # 20234 on Amazon
How much vacuum needed to shift properly?
Guy at the tranny shop said it needs 16in. of vac to shift properly. my old tranny vacuum line ran to the carb. He said thats not good enough, need to run it to the distributer. I have msd dist no vac advance. so he says run it to the intake. I say okay.
What happens if there is no vacuum in transmission?
Without vacuum to the tranny, it will shift late, thinking it is full throttle. If it doesnt shift by e.g. 5000 rpm, that sounds like trouble. :- ( I think that B&M and others make a vacuum modulator for the transmission to accomodate a hot-cam engine which produces much less vacuum.
Should I ported vacuum or full vacuum my engine?
Thanks. You can go either way. There are advantages to both, and disadvantages to both. Chevy made engines both ways from the factory. Full vacuum gives you all the vacuum advance at idle, and the engine gets only the mechanical advance increase as RPMs go up. Ported vacuum allows both mechanical and vacuum advance to be added as RPMs increase.
What should the vacuum advance be on a distributor?
For most street driven vehicle performance applications, starting the vacuum advance at about 8” Hg produces good results. Since the vacuum advance control unit is a part of the distributor, the number of degrees of vacuum advance is specified in DISTRIBUTOR degrees – NOT crankshaft degrees.
Should I port my vacuum to Max advance?
Ported vacuum allows full advance at part throttle accelleration. You also stated in your earlier post Since it is desirable to have max vacuum advance @ idle and part throttle cruising, it appears that ported vacuum can perform properly in neither case. Click to expand...
What is the difference between “ported” and “manifold” vacuum?
“Ported” vacuum allows little or no vacuum to the distributor at idle. “Manifold” vacuum allows actual manifold vacuum to the distributor at all times. Does your engine require additional timing advance at idle in order to idle properly?
