Packard Forum Index » Pre-War (1899-1942)

Hi all,

I have heard rumor that you should have the main jet in the old updraft caburetors replaced with a smaller orifice...reduces (or eliminates?) the risk of burning up exhaust valves from the hotter burning new generation of gasoline. I know nothing about actually getting my 1929 Packard running...I am still struggling with the final stages of accumulating parts. Has anyone heard a similar story...any advice will be much appreciated. If this is true, any idea who machines the appropriate size jet?

I guess another question is: when I do (someday) get to the point of trying to fire this thing up, what gas does one use? Do you add octane booster? Sorry for the seemingly juvenile questions.

John

Reducing the size of the jets will not make it burn cooler. In fact, the opposite will occur.

Given the ethanol now present in gasoline, the more common exercise is enlarging the jets.

As far as fuel, regular 87 octane will work fine in your car.

Cheers,

Tom

Thanks Tom,

As you can see, I have much to learn. You are probably familiar with the jet on those carburetors...a fine sized chunk of copper. Any idea of who can modify it?

There is a fellow in Phoenix that specializes on the early updraft carburetors.

Classic Carburetors
Attn: Mark Buber
3116 East Shea Blvd.
Phoenix, AZ 85028
602-971-3300

He rebuilt my Detroit lubricator and did a great job. It can take a long time, however.

Tom

Thanks very much. I will give him a call.