rochester quadrajet to the 2101 performer intake issue - Chevelle Tech
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post #1 of 71 (permalink) Old Dec 21st, 11, 11:16 AM Thread Starter
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Mark
 
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rochester quadrajet to the 2101 performer intake issue

hey guys,
need help in finding the correct gasket solution for my Rochester Quadrajet to have no vacuum leaks using the edelbrock 2101.

i had a mechanic install the carb and manifold and i have a huge leak at the carb base. (Spraying carb cleaner at the base gasket changes the idle) so im taking matters into my own hands and looking for the correct gasket.

When i got the carb from Shaun murphy he sent me a gasket but the mechanic said there was a huge vacuum leak. the mechanic then got another one but it still has a leak.

anyone have experience or advice the correct gasket/solution?
i found this one - http://www.summitracing.com/parts/MRG-56A/

do i need an adapter or something to make this work using the two together?

i appreciate the help,
Mark

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post #2 of 71 (permalink) Old Dec 21st, 11, 11:44 AM
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Re: rochester quadrajet to the 2101 performer intake issue

Mark,

It'll probablyt be faster to just call Edelbrock and ask their tech line which carb base plate gasket to use for the 2101 and QJ combination.

Dan

Awww, fer cyrin out loud, it's that IMPALA guy again.
If I recall correctly my memory is excellent. My ability to access it is not.
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post #3 of 71 (permalink) Old Dec 21st, 11, 11:52 AM
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Re: rochester quadrajet to the 2101 performer intake issue

The 2101 is a q-jet intake. Try one for like a 86 Caprice. That one used a 1/4" insulator gasket. I have never had an issue with a q-jet on those manifolds unless he is overtorquing it and destroying the gasket.

Ray

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post #4 of 71 (permalink) Old Dec 21st, 11, 12:17 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Just went through this myself.. I would check your initail timing to make sure it has enough to idle properly. In my case, I would spray around the carb base and get a false reaction since it would suck in at the throttle shafts and make the engine happy (thinking I had a vacuum leak) for second since it was idliing with O* timing at idle. Fixed the initial timing and I was able to tune the carb properly.

2 thumbs up for Sean Murphy btw! He builds a killer Q-Jet carb.

1970 Chevelle SS 396 (491 now) 4spd
1969 Nova 496 Turbo 400 Dana 60
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post #5 of 71 (permalink) Old Dec 21st, 11, 12:21 PM Thread Starter
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by 496blaze View Post
Just went through this myself.. I would check your initail timing to make sure it has enough to idle properly. I would spray around the carb base and get a false reaction since it would suck in at the throttle shafts and make the engine happy for second since it was idliing with O* timing at idle. Fixed the initial timing and I was able to tune the carb properly.

2 thumbs up for Sean Murphy btw! He builds a killer Q-Jet carb.
you know whats funny? is the car idles with the idle screw all the way out?!? the screw is an 1/8 of an inch from touching where it should to adjust the idle.... and the car idles?!?

when i got the car back from the shop he had the dwell set at 14. i set it to 30, he had the timing mark 3 inches advanced past the timing plate!!!!, i moved it to 6 degrees advanced.
who knows how much he played with the fuel air mixture screws as well... heh

another thing is that the car has since getting the manifold and carb installed making too much of an air sucking sound through or around the carb. i thought it was because now im using an open air element but it doesn't make sense its as loud as it is unless again, im clueless.

1972 El Camino SS


4bbl SMI QuadraJet
Performer 2101
Points Distributor
76cc Iron Heads
E274s Cam
1470-080 Dish Top Pistons
Stock Converter
Th350 Trans
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post #6 of 71 (permalink) Old Dec 21st, 11, 12:26 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Do you know what the base idle timing is set at? Are you running a PCV valve?

1970 Chevelle SS 396 (491 now) 4spd
1969 Nova 496 Turbo 400 Dana 60
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post #7 of 71 (permalink) Old Dec 21st, 11, 12:30 PM Thread Starter
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by 496blaze View Post
Do you know what the base idle timing is set at? Are you running a PCV valve?
you mean the rpm? its at or around 650rpm.(it doesn't seem like its idling to high or too low.)
yes a pcv valve that has the hoses for the air system hooked up going to the canister and carb port.

1972 El Camino SS


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Performer 2101
Points Distributor
76cc Iron Heads
E274s Cam
1470-080 Dish Top Pistons
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post #8 of 71 (permalink) Old Dec 21st, 11, 12:40 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Guys,

Much of this is discussed in Marks other thread.

Mark, from what you described on your other thread you've got a vacume leak at the carb to manifold gasket. You need to focus on that before you start fussing/discussing the timing again.

Awww, fer cyrin out loud, it's that IMPALA guy again.
If I recall correctly my memory is excellent. My ability to access it is not.
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post #9 of 71 (permalink) Old Dec 21st, 11, 12:45 PM Thread Starter
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Mark
 
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Re: rochester quadrajet to the 2101 performer intake issue

i agree. my main reason for the thread is trying to figure out if i need a special gasket and or adapters etc.
i hesitated in calling edelbrock because its been through two gaskets already, the one Shaun gave me even after i told him i would be using it with a 2101 and the second one the mechanic got.

When i first spoke with the mechanic about it he said the gasket i provided had a leak. He then ordered one and the one that showed up was identical to the one i provided so then, apparently, he went down to the part house to try and find one that would work, that is the one that is in the car now.

1972 El Camino SS


4bbl SMI QuadraJet
Performer 2101
Points Distributor
76cc Iron Heads
E274s Cam
1470-080 Dish Top Pistons
Stock Converter
Th350 Trans
Stock Exhaust Manifolds/AIR System/Dual Exhaust
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post #10 of 71 (permalink) Old Dec 21st, 11, 12:54 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Mark,

Give me a ring and I'll explain it. 703-675-3410.

Dan

Awww, fer cyrin out loud, it's that IMPALA guy again.
If I recall correctly my memory is excellent. My ability to access it is not.
SS 396 4sp
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post #11 of 71 (permalink) Old Dec 21st, 11, 12:57 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by 1972 El Camino View Post
you mean the rpm? its at or around 650rpm.(it doesn't seem like its idling to high or too low.)
yes a pcv valve that has the hoses for the air system hooked up going to the canister and carb port.
No, what is the timing set at in degrees at idle? If you have way too much idle timing on a mild engine it will cause it to idle very high as you describe.

All the connections from the PCV are controlled vacuum leaks and will cause the idle to raise. I would try temporarliy plugging them off and see if you can get the idle to come down to where it can be adjusted by the screw after confirming your idle timing is in the 10-14 degree or so range.

1970 Chevelle SS 396 (491 now) 4spd
1969 Nova 496 Turbo 400 Dana 60
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post #12 of 71 (permalink) Old Dec 21st, 11, 1:33 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by 1972 El Camino View Post
you know whats funny? is the car idles with the idle screw all the way out?!? the screw is an 1/8 of an inch from touching where it should to adjust the idle.... and the car idles?!?
Todd, the above is the key bit of information. If the primary's are all the way closed and the engine still runs the air has got to be getting in somewhere else - like a serious vacume leak. Of course, this assumes the linkage isn't binding and holding the throttle blades open.

Mark, that's another thing to quickly check. Disconnect the throttle linkage to be certain the butterflys are able to close. on their own.

Dan

Awww, fer cyrin out loud, it's that IMPALA guy again.
If I recall correctly my memory is excellent. My ability to access it is not.
SS 396 4sp
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post #13 of 71 (permalink) Old Dec 21st, 11, 1:43 PM Thread Starter
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by ss3964spd View Post
Todd, the above is the key bit of information. If the primary's are all the way closed and the engine still runs the air has got to be getting in somewhere else - like a serious vacume leak. Of course, this assumes the linkage isn't binding and holding the throttle blades open.

Mark, that's another thing to quickly check. Disconnect the throttle linkage to be certain the butterflys are able to close. on their own.

Dan
the throttle cable and even the trans kick down cables are loose. the throttle body is closed all the way.

1972 El Camino SS


4bbl SMI QuadraJet
Performer 2101
Points Distributor
76cc Iron Heads
E274s Cam
1470-080 Dish Top Pistons
Stock Converter
Th350 Trans
Stock Exhaust Manifolds/AIR System/Dual Exhaust

Last edited by 1972 El Camino; Dec 21st, 11 at 2:06 PM.
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post #14 of 71 (permalink) Old Dec 21st, 11, 1:54 PM
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Re: rochester quadrajet to the 2101 performer intake issue

Quote:
Originally Posted by ss3964spd View Post
Todd, the above is the key bit of information. If the primary's are all the way closed and the engine still runs the air has got to be getting in somewhere else - like a serious vacume leak. Of course, this assumes the linkage isn't binding and holding the throttle blades open.

Mark, that's another thing to quickly check. Disconnect the throttle linkage to be certain the butterflys are able to close. on their own.

Dan
Exactly Dan. That is why I am suggesting he eliminate the PCV and Evap canister (until he can get it to idle with the screw), as they are both controlled vacuum leaks. I believe the evap canister is supposed to be hooked to ported vacuum so it doesn't affect the idle circuit of the carb.

Still need to know what the timing is at idle.

1970 Chevelle SS 396 (491 now) 4spd
1969 Nova 496 Turbo 400 Dana 60
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post #15 of 71 (permalink) Old Dec 21st, 11, 2:06 PM
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Re: rochester quadrajet to the 2101 performer intake issue

I hear ya Todd - agreed. Definitely a great idea to remove and cap any vacume ports on the carb to remove them from beign a factor.

In Marks other post on this subject he did mention that he shot propane or other flammable around the base of the carb and saw an increase in RPM. That, along with the other symptoms, still say carb base gasket leak.

I believe that until he can get this thing to idle down around 700 pursuing the timing will be an exercise in frustration for him. Depending on how high it's idling the centrifugal advance might already be starting. No amount of timing advance will keep an engine running if the air is choked off.

Dan

Awww, fer cyrin out loud, it's that IMPALA guy again.
If I recall correctly my memory is excellent. My ability to access it is not.
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