TQ, 440, and vacuum advance
- Thread starter Sonny
- Start date
Im no pro but had to mess around with mine last summer. Close to same set up, 76 440 , cam , 14" vac, 750 eddy.
I ended up with 16 initial 34/35 total , all in at 2500/2600 had a surge above 3500 under load.
no popping or missing just that pesky surge, Got some good advice on here.
I hooked to ported vac and it helped lesson the surge still was there but not bad. I ended up putting a size stiffer spring { pink } in carb and reset the float levels and that finished it. no more surge, starts fine when hot, runs great.
I ended up with 16 initial 34/35 total , all in at 2500/2600 had a surge above 3500 under load.
no popping or missing just that pesky surge, Got some good advice on here.
I hooked to ported vac and it helped lesson the surge still was there but not bad. I ended up putting a size stiffer spring { pink } in carb and reset the float levels and that finished it. no more surge, starts fine when hot, runs great.
Sonny
It’s all fun til the rabbit gets the gun.
Thanks. My Thermoquad only has manifold vacuum. I’m trying to find out what is the initial timing before plugging in the vacuum advance. I realize every engine is different, just trying to find a good starting point.
kowalski
Well-Known Member
That's not a ported nipple by the passenger side idle mix screw?
Sonny
It’s all fun til the rabbit gets the gun.
I don’t know? I was using this drawing attached.
Just hook a vac gauge to that nipple, at idle then up the rpms. Mabey someone who knows more about the Tquad carbs will post.
But the gauge will tell you pretty fast, or heck just start it and at idle pull the cap and see if the idle drops like it has a leak.
But the gauge will tell you pretty fast, or heck just start it and at idle pull the cap and see if the idle drops like it has a leak.
kowalski
Well-Known Member
If it's above the throttle plates, it shouldn't have vacuum at idle, so it could be used as a distributor advance port, rather than EGR.
Bicylindrico
Well-Known Member
Connect to manifold vacuum and make sure the canister is mostly pulled in at your idle vacuum of 15".
Your light throttle cruising vacuum will be higher and will completely pull in the ignition advance.
Your light throttle cruising vacuum will be higher and will completely pull in the ignition advance.
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