I'm a little bit curious, what would be the optimal advance setting for a mechanical dizzy on a stock engine? I mean, what would the correct maximum advance (in degrees) and when (in RPM) should the dizzy start advancing?
Some people here say that you should just try until you find the right setting, but there must be an average correct setting, right?
TIA, Karls
Maximum advance is the critical adjustment. You should not allow a mechanical advance distributor to get above about 28* at 3,000 rpm. A vacuum advance can go higher because it is self-limiting under load when the advance drops due to low vacuum. The advance should get going around 1,100 rpm =/- 100 rpm. I strongly recommend a stock distributor on a stock engine. The aftermarket has done no favors with their shameless and destructive advertising alleging greater power with the 009 for example. Most of the 34 PICT3 and 32PDSIT air bypass carburetors require a vacuum retard to idle correctly, and they transition beautifully with the original distributors. That stupid 009 bogs like a bitch. Those factory engineers were a smart bunch of people, and you second-guess them at your own peril. I have 439,000 miles on my original distributor, a vacuum retard/advance + centrifugal timed at
8* ATDC on my '73 Type 4 bus, it has been keeping up with traffic beautifully for longer than many here have been alive. ColinThanks for your answer Colin. Right now I have stock brazilian dizzys (work really well) and stock carbs. But I wanted to know this because soon I'll upgrade a lost of things on the SB and one of them will be the carbs (dual IDF) and maybe an MSD kit I can get really cheap. I'll check out the range of the MSD dizzy and see if it can match. BTW, have any of you tried this dizzy?
Karls
.................What kind of gasoline is available in The DR? If you have the leaded high octane type that's no longer available in the USA, I'd try
32 or maybe even 34 deg. advance at 3000 rpms. Here in the states, the unleaded 93 octane stuff that's commonly available makes it risky to set it that far advanced. 28 to 30 degrees is what I'd go with here. This is just based on what I've read here and there. An SVDA set at 7.5 deg. BTDC while idling would be a lot better than your 009.........that's what I have on my '77.
...............Whoops!..........I wrongly assumed that you were running an
009 with a stock carb..............my bad.We have exactly the same kind of gasoline as the USA, and I don't have a
009, I have a brazilian vacuum unit (040). Thanks for your info anyway.MotorsForum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.