Inliners International Forums General Discussion Engines Thermo-controled air cleaner

Could anyone help me and my son plumb his 292(integral head)factory air cleaner for proper cold weather operation.The air cleaner's vacumn thermostat and all plumbing were previously removed and we're trying to reactivate it.He runs the"Varjet"Rochester two barrel carb and it has two vacumn outlets currently capped.(labeled B and C).Does the Dampner door work off of metered or intake vacumn?(on that subject,how does one actually determine metered/intake(full)vacumn?)We are running the vacumn advance with intake vacumn...thanks...walt

Walt
I think that it uses manifold vac that is controlled by a thermal switch. I can't remember if it mounted in the head or the thermostat housing. What year truck is it I might still have a vac diagram?

Most of the air cleaners I've seen have the thermo switch built into the air cleaner housing and you just run the vacuum line to manifold vacuum. I'm not familiar with that particular one, though.

It goes manifold to thermoswitch, then to the flapper valve motor.

Dear Walt & Son;

Those never worked even when new.

Look for an 'oil bath' filter unit from a (commercial) vehicle. A (truck) Salvage Yard should have one for around $40.

"Metered vacuum" comes from the Carb. base & then goes to the 'advance can'.

Good luck.

Thanks Guys. I've ordered a air cleaner"thermo-switch"from NAPA.Cold weather/cold motor performance improved big time by running a manifold vacumn hose straight to the air cleaner dampner valve.(we don't want the motor to have a steady diet of hot air as the weather changes)The motor was a basket case,so all of GM's plumbing was gone before we even started the project.I had commented that we run the vacumn advance using intake and the motor seemed to perform much better then with metered vacumn.(butt dyno)I'm sure there's a way to determine intake vacumn from metered vacumn...I just don't know it!...walt...by the way,John,I have an oil bath air cleaner on my 1955 Cadillac,and previousy a 55 Ford and a Ford PU and have never had a problem with their filtering ability,the motors gave me a long life...