when i bought my 65 Fastback the vacuum hose between the distributor and the carb was missing. when asking the seller why, he told me that the engine has an agressive cam and that the hose is not necessary. he was told so by the guy who built the engine.
I am not the carb-ignition freak but my friends told me that the hose has to be connected and that the ignition timing needs to be checked and that the hose does not really have anything to do with the aggressive cam.
its a 289. the car starts without problems and idles nice. when i put the hose on the carb, it doesn't run smoothly. i have not been running the car outside due to bad whether.
i have attached a picture of the carb / Distributor.
when i bought my 65 Fastback the vacuum hose between the distributor and the carb was missing. when asking the seller why, he told me that the engine has an agressive cam and that the hose is not necessary. he was told so by the guy who built the engine.
I am not the carb-ignition freak but my friends told me that the hose has to be connected and that the ignition timing needs to be checked and that the hose does not really have anything to do with the aggressive cam.
its a 289. the car starts without problems and idles nice. when i put the hose on the carb, it doesn't run smoothly. i have not been running the car outside due to bad whether.
i have attached a picture of the carb / Distributor.
any idea? who is right and wrong?
thx.
I doubt your engine is more aggressive than a BOSS 302, and they had vacuum advance. It improves throttle response and fuel economy. I wouldn't use the advance without re-setting the timing, and of course the advance should be connected to the timed venturi port, not manifold vacuum. Necessary is subjective. What intake, carb, cam do you have, and how do you drive the car?
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Amateur restorer. (Well, once in a while I have been paid for it)
It could run rough when it is hooked up, due to a bad vacuum advance on the distributor as well.
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67 coupe White/Parchment
289 .060 over T-5 and 3:80 Gears
RV style MTF-1 Cam with roller tip rockers
Edelbrock F4B with 600 DP
Tri Y with 2 1/4" H pipe Flowmaster 40s
261 RWHP 265 Ft pds TQ at 4400 RPM
Not a track car but nice from stop light to stop light!
Depending on the advance curve you may find that it works better on either ported or manifold vacuum, just experiment with both. I've found that sometimes it is easier to run the engine up to around 3,500rpm and simply rotate the distributor until it sounds right and then see how it cranks and runs, then fine tune in small increments either way.
i don't know about the make of the cam, the carb is a edelbrock 1403, the intake says edelbrock Performance 289, not sure about the exact modell. the car is a regular driver, no racing.
the timed port is sealed so i suppose if it was hooked up at a time in his life, it was with the manifold vacuum and not the timed port.
when plugging it into the manifold port, it runs rough right now. i will try the timed port and see how that goes. i will ask my pal to check the ignition Timing then.
It makes sense that it runs rough when connected to manifold vacuum with no timing adjustment, as this will advance your timing at idle. When connected to the timed (or ported) vacuum, your timing will only get vacuum advance under load, and none at idle. I think you will notice improved performance going that route.
The debate over which is better, manifold or timed vacuum, will go on forever, but you cannot expect to hook into manifold vacuum without adjusting the timing for a smooth idle.
I would also connect it. To time it, I would use the vacuum gauge and adjust the timing to max vacuum, then back off 1.5. Works well for me and let's the engine, with all its modifications, tell you where it likes the timing the best.
I would also connect it. To time it, I would use the vacuum gauge and adjust the timing to max vacuum, then back off 1.5. Works well for me and let's the engine, with all its modifications, tell you where it likes the timing the best.
sorry. you lost me here.. still being a rookie, i am happy that i understood most of the Posts. what would i need to do as you suggest?
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Vacuum hose carb to distributor missing
. what would i need to do as you suggest?
