Edelbrock carb question

[mainermikeyd]

1405 edelbrock carb on GM crate motor, with performer inatake where are you guys connecting your vaccum advance on the carb?? passenger side port or drivers side vaccum port?? Drivers side is full vaccum correct, as in it sucks all the time, yes no???

[boatpuller]

i believe....now,i'm going off memory which is a little scary..mine's off the left passenger side.the right is the pcv valve...i think.

[78 Chevyrado]

I can't remember which does what off hand and I have a 1406, but My vaccum advance is connected on the drivers side small front port. The passenger side small front port is capped with a rubber cap.

The terms are Ported Vaccum and unported vaccum. One creates vaccum at idle, and the other creates vaccum with the throttle open.

[gchemist]

I run mine on ported (passenger side).


You can run either side. All you need to to is set initial timing for the side you want to use. I like using the full vacuum port at the track. Use ported for fuel milage and full for performance.

[boatpuller]

i took a look......left or passenger side goes to the vacum advance.the right port is capped off.and the large center goes to pvc.as gchemist said you can run off either. but cap off the other.

[vtwinsport]

i run it off the ported side (psgnr). makes daily driving much better.

[Pyrotechnic]

Depends what your distributor is set up for. Any HEI and most aftermarket distributors these days are set up for ported vacuum.

[mainermikeyd]

Thanks for the help guys, it helps when you have a place like this to have open discussions about which is what, or what may work better driving on the street vs. at the track or off-roading!!! BTW off my vacuum advance there is a T which also runs to the tranny is this correct??

[vtwinsport]

no problem.
sounds like it could work but usually the vacuum for the tranny is connected to a outlet behind the carb, on the intake. Usually, there is an outlet with a couple stubs on it; one for the tranny, one for the vacuum on the brake diaphram for power brakes. I've seen numerous setups but you certainly want good, direct intake vacuum to those two. If it's working fine, leave it I say.
FWIW

[smashingchuck]

Originally Posted by mainermikeyd

BTW off my vacuum advance there is a T which also runs to the tranny is this correct??

That will do it.

[87Lowrider]

Originally Posted by boatpuller

i took a look......left or passenger side goes to the vacum advance.the right port is capped off.and the large center goes to pvc.as gchemist said you can run off either. but cap off the other.

Dang boat, i could eat a good hot dnner off that motor!

[boatpuller]

Originally Posted by 87Lowrider

Dang boat, i could eat a good hot dnner off that motor!

kenny,you'd have to cook it bud.i'm only good for toast and that's even iffy.

[asphaltburner]

Yo!
Proper vacuum for distributor advance should be to a port that has no vacuum at idle, but applies vacuum with opening of the throttle.
You can tell if the port has vacuum by placing the tip of your finger over the port while the engine idles. Then open the throttle to check vacuum at higher rpms.
Applying vacuum to the distibutor at idle will advance your initial timing changing your advance curve,...and since there's three components to that curve (and it should be set sequentially for proper performance), it would be detrimental to perfomance timing.
Timing should be set initially with vacuum plugged. Run full throttle runs, advancing the timing in two degree increments until some predetonation occurs. Then attach vacuum. If an adjustable vacuum is used, mid-throttle runs cans be used to adjust for some slight predetonation to adjust the total engine advance to the best possible performance, with the least predetonation.
Timing is: initial timing (timing marks), centrifugal advance (weights and springs in the distributor), and vacuum advance (zero at idle, increasing with throttle), and should be set that way for a total of 45 to 55 degrees.
Hope that helps,...questions? Email me at wetminkey@hotmail.com, or PM asphaltburner,...I'm happy to help with this misunderstood aspect of engine tuning!
Todd.

[CEE1NG_RED]

Originally Posted by asphaltburner

Yo!
Proper vacuum for distributor advance should be to a port that has no vacuum at idle, but applies vacuum with opening of the throttle.
You can tell if the port has vacuum by placing the tip of your finger over the port while the engine idles. Then open the throttle to check vacuum at higher rpms.
Applying vacuum to the distibutor at idle will advance your initial timing changing your advance curve,...and since there's three components to that curve (and it should be set sequentially for proper performance), it would be detrimental to perfomance timing.
Timing should be set initially with vacuum plugged. Run full throttle runs, advancing the timing in two degree increments until some predetonation occurs. Then attach vacuum. If an adjustable vacuum is used, mid-throttle runs cans be used to adjust for some slight predetonation to adjust the total engine advance to the best possible performance, with the least predetonation.
Timing is: initial timing (timing marks), centrifugal advance (weights and springs in the distributor), and vacuum advance (zero at idle, increasing with throttle), and should be set that way for a total of 45 to 55 degrees.
Hope that helps,...questions? Email me at wetminkey@hotmail.com, or PM asphaltburner,...I'm happy to help with this misunderstood aspect of engine tuning!
Todd.

Huh??
I will need to do this to my 1405 since the PO capped/plugged both sides causing my dipstick to come off. Now, from my understanding...the best place for daily driving is on the passenger side (where the PCV hose to be connected to the 1405, correct??? Now, will that require adjustment on the timing? If so, how can this be done? I haven't started the car since I bought it and with limited timing leaves me no time to fix this until this weekend, when I have some time.

Thanks in advance...

[willstruck]

Originally Posted by CEE1NG_RED

Huh??
I will need to do this to my 1405 since the PO capped/plugged both sides causing my dipstick to come off. Now, from my understanding...the best place for daily driving is on the passenger side (where the PCV hose to be connected to the 1405, correct??? Now, will that require adjustment on the timing? If so, how can this be done? I haven't started the car since I bought it and with limited timing leaves me no time to fix this until this weekend, when I have some time.

Thanks in advance...

Block the line going to the distributor to set the timing. Doesn't matter what port you normally have it hooked to, pull the hose off the carb and block the hose. It really only takes maybe 5 minutes to do the timing. You just need the gun, and a 9/16 wrench. 11 degrees BTC or so seems to be fine for a SBC, factory specs is 4.