The instructions for timing setting with my vacuum gauge said to advance the
timing till the needle just starts to flick occasionally, indicating a
misfire. Back off the timing until the needle is steady again, then back it
off a further 3/4in Hg. Using a vacuum gauge results in a setting that
suits the actual characteristics of an individual engine, unlike the 'given
number' method which uses a 'worst case' scenario. I.e. using a vacuum
gauge is a Good Thing.
PaulH.
-----Original Message-----
From: john c kahoon <john.kahoon@juno.com>
To: robert@woozy.com <robert@woozy.com>
Cc: mgs@autox.team.net <mgs@autox.team.net>; spridgets@autox.team.net
<spridgets@autox.team.net>
Date: 20 February 1999 11:05
Subject: Re: [Fwd: ummm..... houston, we have a problem.......]
boundary="------------EA99879F51D7DCD544389CFF"
>I don't know if you have a vacum advance or retard, but you CAN set your
>timing with a vacum guage.. Disconect vacum advance, turn dizzy til you
>get mx. vacum, then retard a little. reattach advance. Works well with
>worn motors ( makes up for wear ).
>you can also advance for max idle ( advance disconnected ) til it starts
>to miss,
>then retard til it quits. ( Ear method ).
>In a nut shell your right, what your seeing it not true, like you said...
>
>john.kahoon@juno.com
>71 Midget
>
>On Fri, 19 Feb 1999 08:17:59 -0500 robert weeks <robert@woozy.com>
>writes:
>>Hi Paul,
>>
>>I am pretty sure it is not at "TRUE" 40 BTDC. That's just what I have
>>to
>>dial the gun to in order to get the line to line up with the pointer.
>>I'm
>>not too sure how the gun, the dial, and the timing all interact. The
>>fact
>>that it doesn't run at all at 13 or 8 or 23 BTDC I think proves that.
>>I
>>didn't just crank it up to 40 just because I felt like it. 40 and
>>thereabouts is the only place the engine will run smoothly or at all.
>>
>>I tend to agree with Frank that it is probably the dizzy drive that is
>>out
>>by one tooth, that would explain the odd orientation of the dizzy.
>>
>>I'm going to work on it some more today (I took this week off from
>>work to
>>do this, it's cheaper than paying a mechanic ;-) I'll let everyone
>>know
>>what I find out.
>>
>>Thanks,
>>
>>Robert
>>
>>
>>At 12:32 AM -0500 2/19/99, Paul A Asgeirsson wrote:
>>>Whoa! Whoa! Whoa up there friend!
>>>
>>>Assuming that the vibration damper ring isn't slipping and that you
>>have
>>>the right vibration damper mounted and the pointer is the right one
>>for
>>>the damper, then idle at 600 RPM with the vacuum disconnected should
>>be
>>>about 8 degrees BTDC. With the dizzy advance, vacuum advance
>>combined,
>>>then at high RPM (3000-3500) the TOTAL advance should not be greater
>>than
>>>about 30 degrees. Timing advance+dizzy advance+vacuun
>>>advance=approximately 30 degrees.
>>>
>>>If you have an idle advance of a true 30 degrees, you will have kick
>>back
>>>on the starter and will likely damage the engine when running at that
>>>much beginning idle advance.
>>>
>>>Paul
>>>PAsgeirsson@juno.com
>>
>>
>>
>
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