ShopTalk Forums | Aircooled VW Tech & Restoration Help

Jake:

Why do you prefer the fully centrifugal unit over the unit that also has a vacum advance? I hear the vacum advance unit allows the engine to run a little cooler at highway rpm's and that the gas mileage is a tad bit better.

thanks

I have never seen the huge advantages that the vac supoposedly creates over the centrifugal unit..

The Vac is MUCH harder to adjust, even for me... with a dyno

Would´nt the effects of the vacum unit also only be beneficial on engines attached to trannys with high ratios ? Or/and perhaps on engines supplied with carbs juuuust a little too big for the application ?

I thought that that would be where there could be gained something. - I bought one for a 1904 T1 engine that only revs 2580 rpms @ 55 mph.
Ít is not dynoed yet, but will be when spring really comes over here. But I was hoping to get the heads to run a tad cooler at regular road driving. (swopping from an old german 009)
But we´ll see about that.
T.

Okay:

Getting the Unilite-centrifugal advance unit-NO vacum.

How about some setting suggestions? It is a type 1 engine-1904 (74 x 90.5) w/40 x 35.5 valved ported and polished heads and a 1 5/8" merged header to Fat boy. Stock rockers, dual DRLA 40's and a Web 119 cam.

The guy that's selling it to me says it has a pink spring and a gray one in there already. What I'm looking to know is if I should keep this set up as to the springs (I keep hearing about using 2 gray springs) and what a good set up for the advance curves would be for this engine.

Thanks,
Rick

Onk and Gray are the fastest available... Not good unless you have a wild cam.... try a grey/grey combo and 12 degrees initial advance

Thats gotta be one of the funniest typos I've seen. And the O is right between the p and the I.

I guess I'm just easily entertained

Ron

It's shorthand.

its "oink"..... pigs are pink..... You are suppose to be keen enough to pic up on my thoughts at this point....LOL

I'm running an SVDA from aircooled and it woke up my engine big-time! But I have to say that it's the mechanical component that can take most of the credit (excellent curve John!). I'm running a new stock carb for low-end torque and your running duals, plus a significant cam. It's unlikely they will produce a decent enough vacuum signal to have much of a benefit. The mechanical-only Unilite is the best choice.

Thanks for the input. 12 degrees initial advance, what about max. advance?

Thanks,
Rick

Bump

Thats 10% dependant upon the rest of your combo and even carburetion...... test it @ 28-34 degrees, but to do it right you'll need a CHT gauge, and a good ear for detonation....