TylerW
Well-Known Member
Well, I've been running a 600 Edelbrock on my warmed-over 318 in the Dart. It's been a love-hate relationship to say the least.
My car doesn't get driven much since it's still under "renovation", and if I let it sit a month without running, one side of the idle circuit in that carb will plug up and I have to blow it out with an air gun.
It's also calibrated too lean since I had to fudge it with the stiffest springs there are, and still have a part-throttle surge. Add to it the electric choke which doesn't work well, blah blah blah...and I'm ready to put on a Thermoquad.
I happen to have a very nice 6518s T-Quad, which was original equipment on a 440 in a '73 motorhome. That incidently also makes it the 850cfm version. That would work perfect because it has the right ports for the charcoal canister, which OCD types like me must run lol.
My question is, can that Thermoquad simply be rejetted down to an appropriate calibration for the 318 irrespective of it being the large primary version? I rebuilt that thing but I don't remember much about it now.
I know Quadrajets intimately and those you can't recalibrate easily on the primary side. However, they DID run the larger 800 cfm version on small engines like the 307 Olds, and downrated the CFM from 800 to 525 by restricting the secondary air door opening to about 50 degrees, along with secondary metering rods which were very lean and had no power tip.
Thank you.
My car doesn't get driven much since it's still under "renovation", and if I let it sit a month without running, one side of the idle circuit in that carb will plug up and I have to blow it out with an air gun.
It's also calibrated too lean since I had to fudge it with the stiffest springs there are, and still have a part-throttle surge. Add to it the electric choke which doesn't work well, blah blah blah...and I'm ready to put on a Thermoquad.
I happen to have a very nice 6518s T-Quad, which was original equipment on a 440 in a '73 motorhome. That incidently also makes it the 850cfm version. That would work perfect because it has the right ports for the charcoal canister, which OCD types like me must run lol.
My question is, can that Thermoquad simply be rejetted down to an appropriate calibration for the 318 irrespective of it being the large primary version? I rebuilt that thing but I don't remember much about it now.
I know Quadrajets intimately and those you can't recalibrate easily on the primary side. However, they DID run the larger 800 cfm version on small engines like the 307 Olds, and downrated the CFM from 800 to 525 by restricting the secondary air door opening to about 50 degrees, along with secondary metering rods which were very lean and had no power tip.
Thank you.