I am a vacume timer from way back. Timing chains strech, I plug the line to
the dist.
And at a normal idle, bring the vacume to its highest point, Hopefully
around 20 inches.
Then back off a inch.This is the best way to time a car that has been driven
for a while.
Carl E.
-----Original Message-----
From: Greg MAHNEY <mahney@central.murdoch.edu.au>
To: spridgets@autox.team.net <spridgets@autox.team.net>
Date: Thursday, May 28, 1998 11:12 PM
Subject: Vacuum Guage Timing (was 1275 timing advance)
>I seem to recall that the "How to be a Home Mechanic" course I went to
>about 20 years ago recommended just using a vacuum guage to do your timing.
>
>Basically, you set the idle to about 4000rpm and then turn the distributor
>until you get the highest, steady reading. I've given it a go and it seems
>OK (but I wouldn't know if it is optimal).
>
>Has anyone got a view (as if you haven't!) on this method?
>
>Greg
>
>
>
>
>>Set yor timing at speed not idle. Most of the books call for 35 deg @
>>4000 rpm, I find that 37-38 deg is about all you want to go for total
>>advance at 4000 rpm. As to what this is at idle depends on the
>>distributor and points dwell it can vary a lot. My bug-i with 948cc and
>>mechanical advance distributor is static timed at 12 deg BTDC with a
>>points dwell of 60 deg to get 37 deg @4000rmp total advance.
>> Crash
>
>
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