This question is 'educational'...to flatten my learning curve.
My told that my 009 has a 21 degree advance, whereas the 050 has a 28 degree advance with a ''longer curve between shifting points''
Does this mean the 050 gives me a higher rpm (more asphalt covered) before shifting out of first into second?...i.e. it takes longer to reach the max torque shifting point?
Dear Marksbug: Should you respond please break your thesis into readable paragraphs.
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Carl, I'm running an 050 on my 1915 but haven't fully road tested it but the advance is dictated by RPM and not load.My selection was done years ago on recommendation of Dellorto at the time.
Another link for your library. http://www.aircooled.net/vw-distributor-options/
It's can be set for better performance and better fuel economy It allows you to have a Ideal power curve on Advancment
Here's the advance curves for the 009 and 050. The 050 not only gives you more advance, it also starts advancing 400 rpm sooner and is fully advanced 400 rpm sooner than the 009. It also doesn't have the 009's flat spot. This will change the power characteristics of your engine (better midrange assuming the extra advance doesn't cause detonation), but it's not going to change your shift points much. The higher total advance could make the idle timing too retarded however, causing you other issues. Of course, they don't make the 050 anymore, either.
http://forums.pelicanparts.com...ibutor1364318591.jpg
Your question, restated, is whether the 050 would provide a higher rpm before shifting out of first into second.
I believe the answer is no. My guess (and that's all it is) is that greater total advance and a longer advance curve will affect the engine's performance but won't affect the shift points to any noticable extent.
I think the greater amount of advance and longer advance curve will be reflected in a lower initial static timing than what you have now and the advance will be all in (between 28 and 32 degrees, depending on who you ask) at higher RPMs than where it tops out now, depending on how slowly the advance comes in. Glenn Ring on the Samba is probably a good guy to ask.
D'oh. Took too long to write and JustinH came in with the lab coat and graph in the meantime! Sweet!
To my friends oldyeler...Justin...Ted
Thanks guys. The three of you have stroked the smoldering embers!!
I just purchased a 050 with Petronix pointless ignition from a young man in California for a good price...even so, I've become quite accustomed to a cheap dull diet of rice & beans...so the Madness continues.
Because the advance starts sooner with the 050, I think that would be a good thing with dual carbed motors. But it has a lot more advance built into it, so to keep it from detonating at full throttle when the motor's at operating temps you have to set it at substantially less initial advance, and that's not good either. Wasn't it originally for 356 motors, with their hemispherically shaped combustion chambers? They typically need more advance to complete the burn. Al
ALB +1
An 009 isn't the best or worst, but workable. If you must have a vacuum advance, get an SVDA (034) distributor from John at aircooled.net. He can set it up to work with the vacuum signal from dual Webbers. I agree the 050 isn't what you need.
Carl, you may get better mileage with an SVDA, but performance shouldn't change any.
Trying the 050 distributor shouldn't hurt anything provided you make sure your max advance is below detonation. Provided you do that, it seems to me (some bozo on the internet) that the worst thing that could happen is there would be almost no advance at idle so the car won't start or will have a rough idle - like JustinH said.
By the way, sorry if my first post was a little hard to understand. I should've proofed it.
I stretched the spring on my 009 to bring in full advance by 2500 rpm,this brings up the tq. earlier and gives you a much broader powerband. Full advance stays the same due to the limiting tab,however you can manipulate the onset of full advance. This is old tech,play with it a little!!
.... may get better mileage with an SVDA, but performance shouldn't change any.
What Danny said here...remember that at full throttle an SVDA acts just like a mechanical only distributor. Only at part throttle/ highway cruising do the carbs create the conditions necessary to operate the vacuum can and add additional advance to increase mileage. I think the trick here would be for someone to modify an SVDA to have a mechanical advance curve more like an 019. Come to think of it, I'd like to see how John at Aircooled.net modifies the SVDA's he sells for dual carburetors....Al
And James is right; there's a number of things you can do to an 009 (or any distributor) to modify it's mechanical advance curve to better suit your motor. I have a bunch of it written down in my notes; if I think of it and find it I'll post it here. To again quote Danny: "An 009 isn't the best or worst, but workable." So true.
