Different carbs on dual tunnel ram

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gzig5

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Can I use different model but same size carbs on a TR5 tunnel ram that is street driven? The main difference being type choke. I've got a 650 AVS2 1906 with electric choke already and a friend has a manual choke version 1905 that I could get a good deal on to put on the dual carb top tunnel ram I'm looking to play with. Never played with duals and not sure if I could just use the electric choke on the one or would I need to connect the manual choke as well? Not going to be a ton of really cold weather driving but I don't want it to be a bear to deal with in the morning.
 
gzig5 said:
Can I use different model but same size carbs on a TR5 tunnel ram that is street driven? The main difference being type choke. I've got a 650 AVS2 1906 with electric choke already and a friend has a manual choke version 1905 that I could get a good deal on to put on the dual carb top tunnel ram I'm looking to play with. Never played with duals and not sure if I could just use the electric choke on the one or would I need to connect the manual choke as well? Not going to be a ton of really cold weather driving but I don't want it to be a bear to deal with in the morning.
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Other than the manual choke carbs being calibrated more for performance, than the electric versions, they are the same carbs. If you were to tune them the same, as far as jets and rods, they would be identical carbs other than the choke. I spoke directly with a tech at Edelbrock, contrary to the literature, the manual choke AVS2 carbs can have an electric choke added. It is however a much more intricate process than with their other models.

Factory multi carb setups, like Hemi's and 6 packs, came with one carb wearing a choke and the remaining carbs were chokeless.
 
Great. Sounds like i could be in business. I'd definitely set them up the same to start with and tune from there.
 
Out of curiosity, what is the rest of the build, if you don't mind sharing?
 
You could likely join choke plate from electric choke, to the choke plate on the manual choke unit, with some sort of linkage also. Have them both control off of the electric choke actuator.
 
cpearce said:
Out of curiosity, what is the rest of the build, if you don't mind sharing?
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Nothing written in stone right now but I have a '71 340 with J-heads and an Air-Gap & AVS2. Thinking about iteratively changing from the stock cam to an XE275HL I have, then using my new-to-me Sioux valve/seat grinding stuff to redo the heads and do some porting, then the TR5, then a set of ProMaxx 171's I have on hand and then SFT cam from Mr. Jones, then maybe redo the extra 340 block I have with a 4" crank and having the heads touched up to the 280-ish cfm range or better. The car is a 73 Cuda and will have a manual transmission and targeted to the twisties rather than straight line drag racing. At some point I want to try a STR-12 or home built version, and maybe more capable heads and fuel injection of some sort. It will be a several year effort overall. I'm an engineer and I like to tinker and learn. I'll be playing with the suspension along the way as well.
 
The reason hemi and 6bbl carbs only have choke on one carb is that one carb is the only one that has the throttle plates opening with you foot coming off idle speed to drive the car. The other carbs open later.

if you are going to have a progressive linkage you can have choke on one. If you have both operating at all times then choke may be needed on both if you are concerned about cold weather driving.
 
I don't know if tunnel Rams and twisties are a good combo in my opinion. The higher you set the carburetor up the larger amount of angle you will have from suspension depression or other forces caused by cornering. For that reason keeping the carburetor low and simple would seem to be your best approach. With fuel injection probably being your best and most stable solution dealing with switching geforces and such.
 
I don't know if the carbs being a couple inches higher will materially affect anything, but we will find out. Unless you are getting a lot of rotation on the motor/car, the side forces would be similar at the oil pan and the carb.
 
In the AVS2 instructions I had, edelbrock recommended using a manual choke on one carburetor only and wiring (or mechanical fouling) the other choke open on dual carburetor setups. They have a pair of 1903 manual choke carburetors (500cfm) that come pre calibrated for a two four setup. When you get to where you are talking about going with a 4 inch crank and high lift cams with good heads, it’s time to graduate to a pair of sideways mounted 4150 Holley type carburetors, though.
 
Just do both.

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Maybe a Holley 500 on the front and a Thermoquad on the back with progressive linkage. lol
 
I'm in the process of putting 2 Edelbrock 1905 650 AVS2 carbs on my Holley pro Dominator W2 engine. About to order a 6 pack hood to enclose it all. I personally prefer the contained look. Just looking around for a second 1905 Edelbrock.
 
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