71whitewesty wrote:One of the items we diagnosed was the dimmer relay.
Meyle sure is misleading.
we adjusted the timing and carb on the newer 71, it has a bit of a pitter in the exhaust when coasting down hill in gear. Maybe advanced too much? Pretty sure I don't have any exhaust leaks and it didn't do that before we messed with it. It's running pretty good but can also take a few extra cranks to get it started. I'm thinking it's advanced a bit too much but still runs well. Any thoughts on that one?
Modern corporate thinking says to milk old reputations to death. "Meyle Germany" just means the company's mailbox is in Germany. They know that "made in Germany" is cachet, and they do avoid actual fraud by just titling the box Meyle Germany, and identifying the part as made in Brazil, which is a definite hit against quality for some parts.
The pitter (pitter?) is usually evidence of a slightly lean mixture which can cause a longer burn. You are hearing the tail end of combustion entering the exhaust system. VW went nuts trying to get rid of lean backfires back in the day with the dual carb buses, gulp valves and dashpots. The '71s had dashpots and the 70 and earlier had throttle positioners.
I think . . . retarded timing adds to exhaust backfire on overrun, but you are hereby not given permission to advance the timing just to reduce backfires. I can't remember our numbers any more, but do you remember which way we went? The re-positioning of the distributor drive gear I think erased any recording of what your timing was initially. I am *known* to make your engine weaker and smoother by setting the timing to absolutely no more than factory limit. Many do advance it up a bit for more power, and I frequently find Type 1 engines up at 30-32* btdc. Blaaahg I say.
If you would like to experiment, feel free, just note your starting point. I tune for performance, temperature and/or economy, and do not adjust anything in the attempt to eradicate a how do I say it delicately? . . . a trifling annoyance at best.
BobD - 1978 Bus . . . . . . . . . . . 112,660 miles
Chloe - 1970 bus . . . . . . . . . . . 206,845 miles
Naranja - 1977 Westfalia . . . . . 112,885 miles
Pluck - 1973 Squareback . . . . . . 55,570 miles
Alexus - 1991 Lexus LS400 . . . 78,899 miles