Tunnel ram carb tuning
So it's been a while but I'd like to share some street dual quad adjustment and tuning info.
I was not able to get my 1850 v/s carbs to not function properly. Although I wasted some time and money on billet primary blocks and secondary metering plates (with replaceable jets) .What needed to be done I believe with guidance from fellow Mopar people here, is to drill out the pressed in bleeds and tap them for a replaceable style bleed. There are issues with choke tower clearance and also thoughts on transfer slot restrictions.
I decided to purchase a set of dedicated 450cfm tunnel ram carbs through Quick Fuel. Highly adjustable and much better right out of the boxes. But still lean at cruise.
Anyway after taking the carbs apart and adjusting them (jetting,power valve) I wanted to make sure they were both set up the same. Primary throttle blade to transfer slot....anyway when set up the same engine wouldn't idle below 1500 rpm. Called QF for the 7th time and must have finally got someone who actually knew about dual quads. He suggested I set up the primary carb (rear with electric choke) with transfer slot set up as I had and back the secondary (front) carb idle screw off to close the transfer slot. Now set up the carbs as per normal (mixture screws for best vacuum reading) and then turned the idle down. Car idles at 900 warm with no run on and really screws! Choke works (minus 3 the other morning) driving to work. I think its funny people are upset about the salt treated streets. It took 40 years for the original quarters to go!
Again. The key was to treat the intake like a single quad and work the primary carb. This is a street set up btw. I hope this helps someone. I haven't given up on the 600s. Just haven't got around to it.
So it's been a while but I'd like to share some street dual quad adjustment and tuning info.
I was not able to get my 1850 v/s carbs to not function properly. Although I wasted some time and money on billet primary blocks and secondary metering plates (with replaceable jets) .What needed to be done I believe with guidance from fellow Mopar people here, is to drill out the pressed in bleeds and tap them for a replaceable style bleed. There are issues with choke tower clearance and also thoughts on transfer slot restrictions.
I decided to purchase a set of dedicated 450cfm tunnel ram carbs through Quick Fuel. Highly adjustable and much better right out of the boxes. But still lean at cruise.
Anyway after taking the carbs apart and adjusting them (jetting,power valve) I wanted to make sure they were both set up the same. Primary throttle blade to transfer slot....anyway when set up the same engine wouldn't idle below 1500 rpm. Called QF for the 7th time and must have finally got someone who actually knew about dual quads. He suggested I set up the primary carb (rear with electric choke) with transfer slot set up as I had and back the secondary (front) carb idle screw off to close the transfer slot. Now set up the carbs as per normal (mixture screws for best vacuum reading) and then turned the idle down. Car idles at 900 warm with no run on and really screws! Choke works (minus 3 the other morning) driving to work. I think its funny people are upset about the salt treated streets. It took 40 years for the original quarters to go!
Again. The key was to treat the intake like a single quad and work the primary carb. This is a street set up btw. I hope this helps someone. I haven't given up on the 600s. Just haven't got around to it.
