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08-18-2008, 06:58 AM
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#1 |
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Registered User
Join Date: Aug 2007
Location: Vandalia, Ohio
Posts: 396
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Timing spec.
Hey Guys,
I'm looking for the timing spec for a 1975 250 6cyl. I've been setting it to the 230 spec 4' BTDC, thinking they would be the same. Then I ran across the tune up specs for a 1973 250 that said 6' BTDC, but nothing was offered for a 1975. Thanks, Tim |
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08-19-2008, 11:36 AM
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#2 |
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Registered User
Join Date: Aug 2007
Location: Vandalia, Ohio
Posts: 396
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Re: Timing spec.
Well, I bumped it up to 6' and it seems to be running a lot better.
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08-19-2008, 01:30 PM
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#3 |
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Cantankerous Geezer
Join Date: Aug 2002
Location: Bel Aire, KS
Posts: 6,264
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Re: Timing spec.
I usually start at 10*. If it pings on acceleration, I start dropping untll the ping stops. I rarely end up below 8*.
Usually more advance means a little better milage.
__________________
Fred There is no such thing as too much cam...just not enough engine. 
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08-19-2008, 01:41 PM
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#4 |
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Registered User
Join Date: Dec 2005
Location: Lake Oswego, OR
Posts: 318
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Re: Timing spec.
On my ol' 230, I was rather casual about timing. Pretty much like Fred T says. I had my dist clamp snug, but loose enough I could spin the dist anytime anywhere. And to my surprise, it never moved on its own (that's in 25+ years of service). So a tune up was to replace pts/cond/plugs, advance the timing a little.Start up and drive around, if it pinged then stop by the side of the road and retard a little, repeat until no more ping.
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08-19-2008, 02:06 PM
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#5 |
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Registered User
Join Date: Aug 2007
Location: Vandalia, Ohio
Posts: 396
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Re: Timing spec.
Sounds like a plan. I'll give it a try, and let you know where I end up.
Thanks |
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