Anyone know the mechanical advance vs RPM curve, advance vs Vacuum specs and base and total timing for the factory SuperCharged 312? Getting ready to build a base tune for our 292 Turbo and just need a starting point to work from.

What heads & cam are you using for the turbo application? Just curious. 

Stock 62-64 C1TE

Don't copy us. This is going to see as little boost as possible. It's just for fun. Not trying to go fast. It's a 2bbl, maybe 5psi. 215hp ish

My wife wanted her dump truck to make turbo noises. I'll post pictures in a few days when we get it going

I thought it was an unusual combination, particularly for an F600, but I've seen stranger builds.

“My wife wanted her dump truck to make turbo noises.”

That may be the only time I ever read a sentence like that!! Awesome!

MplsMike
'56 Parklane
Minneapolis, MN

Back to your original post, the following comes from the factory Supercharger Manual.  Vacuum advance:  
Dist RPM     Deg.        Inches HG
1000            0               1
1000            0-1            5
1000            1-3            7
1000            9-11         14
1000            9-11          20
Centrifical Advance:
Dist RPM         Deg.
300                0-1/2
400                2-3
600                8-9
1500              9 3/4-11
2000              10 3/4-12
Initial  timing    3 deg.

John

John - "The Hoosier Hurricane"

Thanks John!

Am I reading that correctly, they only ran 15° total advance?

Was there any boost retard solution?

I figured this old 292 would want about 36° total before boost. Pulling 20 degrees for 9psi seems excessive. I was thinking about 4° retard at 5psi(target boost for us)?

I’m not arguing with the F code spec, but this was my experience. 292/312 crank, 320cid. 9:1 true static ratio. 113 Mummert ported iron heads, 270 series cam (20 years ago, spec may have changed). Paxton SN2000, pulleys for 5lbs at 5000 rpm. Premium pump fuel.

I ran 10-12 initial, and 34-36 all in. The vacuum can had probably around 15 or 20 degrees in it. I used an MSD and ran 2* retard at 3 psi (manifold pressure). That came in around 3000 rpm, maybe a little higher. Hot weather, or racing with long WOT periods, I’d need less initial/less centrifugal/ more retard. Didn’t happen enough to do more than set the initial back a bit.

Your results will depend on the engine/cam specs, etc.

miker
55 bird, 32 cabrio F code
Kent, WA
Tucson, AZ

The specs show 27 degrees total mechanical advance, there would not have been any vacuum at full throttle, probably about 6 pounds pressure.  On my car, I'm running SN60 guts in my blower for about 12 pounds boost at 6000 RPM.  I used to run 34-36 total advance, lost a lot of head gaskets.  I  backed down to 30  degrees total, the car ran quicker and head gaskets now live.  I get 27 degrees from the specs, 12 distributor degrees times  two plus 3  degrees  initial.

John - "The Hoosier Hurricane"

"Distributor Degrees"! I missed that, when reading. Thanks for the clarification. 27° sounds more like it!