[Tigers] Timing

[coolvt at aol.com]

I remember buying a 1972 Chevy.  For pollution purposes the vacuum advance line was blocked off by a solenoid . It was a 3 speed manual and the solenoid would only open and allow vac. advance in 3rd gear.  Of course it was simple to by-pass:-)
 
In a message dated 11/6/2017 2:05:29 AM Eastern Standard Time, tigers at autox.team.net writes:

 
Well I did say I was probably wrong.
 
Steve


From: Gary Winblad <garywinblad at comcast.net>
Sent: Sunday, November 5, 2017 11:13 AM
To: steve wick; Tom Witt; tigers at autox.team.net
Subject: Re: [Tigers] Timing 
Nooo.. cars had vacuum advance way before anyone gave a rat's a$$ about 
 emissions...
 Emissions brought on the vacuum retard... two hoses to opposite sides of 
 the diaphram.
 Gary


 On 11/4/2017 10:28 PM, steve wick via Tigers wrote:
 >
 >
 > I'm probably wrong, but I think vacuum advance was for emissions, not 
 > gas mileage.
 >
 > Steve
 >
 > ------------------------------------------------------------------------
 > *From:* Tigers <tigers-bounces at autox.team.net> on behalf of Tom Witt 
 > via Tigers <tigers at autox.team.net>
 > *Sent:* Saturday, November 4, 2017 5:51 PM
 > *To:* tigers at autox.team.net
 > *Subject:* Re: [Tigers] Timing
 > Thanks for the pictures Ron. The second type seems to use not only the
 > springs, but the cam action on the weights edge as a means of plotting 
 > the
 > advance curve.  The math for the RPM, spring tension, weight... - AND cam
 > action baffles my brain.  Somewhere I have a Mallory dual point (no 
 > vacuum
 > advance) distributor. Got it in a pile of "free" stuff at a Mopar 
 > swapmeet
 > (No step child parts for him!).  I'll have to check it's advance 
 > system out
 > some time.
 >
 > Oddly I had a Volvo 544 that got 36 MPG on the highway and it only had a
 > mechanical advance (no vacuum). Seems to defy the necessity of vacuum
 > advance with mileage like that.
 >
 > -----Original Message-----
 > From: Ron Fraser via Tigers
 > Sent: Saturday, November 04, 2017 12:16 PM
 > To: 'Gary Winblad' ; tigers at autox.team.net
 > Subject: Re: [Tigers] Timing
 >
 > Picture 1 is the early style Ford distributor with oil port, ID# C2OF-J -
 > note there is 1 slot size for each weight - this is the area that I have
 > seen wear problems
 >
 > Picture 2 is the later style Ford distributor, ID# C8AF-E - note the 
 > 13L &
 > 18L slots - the 13L slot is being used in this example
 >
 > Just wanted to show the differences in these 2 mechanical advance systems
 >
 > Ron Fraser
 >
 > -----Original Message-----
 > From: Tigers [mailto:tigers-bounces at autox.team.net] On Behalf Of Gary
 > Winblad via Tigers
 > Sent: Friday, November 03, 2017 10:58 AM
 > To: Smit, Theo <Theo.Smit at garmin.com>; Tom Witt <atwittsend at verizon.net>;
 > tigers at Autox.Team.Net
 > Subject: Re: [Tigers] Timing
 >
 > The Tiger distributor I bought from Sunbeam Specialties(was years ago) 
 > was
 > the kind with the two position advance limit.  I just had to turn it 
 > to the
 > more limited stop, put in lighter speed shop springs and then limit the
 > vacuum advance. All on my stock 260, works great, still on regular gas.
 > Gary
 >
 >
 > ---
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 >
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 >
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