[T2] And the bus is home again!

[Sami Dakhlia]

Thanks, David. Having a lift must be nice and I plan to get one myself.
Found that kneeling behind the engine or laying under the bus has gotten a
bit harder over the past 10 years... hahaha!
On the timing curve with the original dual vac, you need to add the 12
degrees of vac retardation that is cancelled as soon as the butterfly valve
in the throttle housing is actuated. (VW's early version of a smog control
defeat device? :) This brings you back to your stated 43 degrees total. But
when I time at 28 deg @ 3500 rpm, the vac lines are disconnected, so full
advance under load with vac lines reconnected is indeed about 40 deg. Maybe
I'm being too conservative and I may push the boundaries again once I have
more data.
On the timing light, I _do_ have the fancy Innova. The issue is that the
plastic and the aluminum timing scales do not agree on where the 0 mark is.

On Wed, May 19, 2021 at 11:24 PM david raistrick <keen at icantclick.org>
wrote:

> congrats to getting back to the bus again!
>
> mine was on the lift for the last 3 waiting on time to do the rear
> brakes.... now done.  but the mini is getting the AC and a bunch of other
> things finished first, then the bus goes back on for fuel lines and general
> engine bay cleaning.  then it'll be drivable again.
>
> so timing - my memory of mucking with typ4s back in the day was that they
> ran a lot more total timing than did uprights.  I'm remembering like 40-43
> degrees of max advance. looking at a copy of jim's old data -
> http://type2.com/~keen/ignition.html - though I guess I'm remembering
> wrong.  a 75 would be ~~31 all in (-5 to start, then 25 centrifugal and 11
> vacuum max).
>
> get a better timing light, though - you dont need to use the scale at all.
>  digital timing lights only need the 0 mark.    I bought this one years ago
> - https://www.amazon.com/gp/product/B000EVU8J8/ -  INNOVA 5568 Pro
> Digital Timing Light .   Even the cheaper "advance" version will do fine.
>  Of course I've basically never touched the timing since going pertronix.
>  set it once and forget it.  (I did tune and tweak it a bunch as I was
> rejecting and tuning the carb)
>
>
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