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04-17-2016, 06:24 PM | #1 |
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Effect of Large Point Gap?
Hi All,
My truck had been sitting for several months, for the winter/brake job. That's all done now, and the first trip around the neighborhood it got real hot, real fast. In the previous two years, I've never once had an overheating problem, and don't even spit water with a completely full radiator. Obvious culprit for a hot engine is timing. The point gap was .030... After adjusting the points back down .020 & re-timing, the over-heating is gone & everything is back to normal. Would a large point gap cause over-heating, or was it likely that both the point gap was way too big & the the timing was too advanced? There were never any knocking and there was never any obvious difficulty in starting it. Just curious... |
04-17-2016, 06:43 PM | #2 |
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Re: Effect of Large Point Gap?
If the points gap is too wide, the timing is retarded. Late timing can cause an engine to run hot. You may have hit the nail on the head.
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04-17-2016, 07:58 PM | #3 |
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Re: Effect of Large Point Gap?
Ahhh... I guess I hadn't put two and two together that retarded timing also caused overheating, I was just thinking it was being way too advanced and getting the heat from knocking... Thanks!
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04-17-2016, 08:09 PM | #4 |
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Re: Effect of Large Point Gap?
I believe it is the other way around. A large point gap will advance the timing. Either you couldn't hear the knocking or you have another problem.
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04-17-2016, 09:02 PM | #5 | |
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Re: Effect of Large Point Gap?
Quote:
Maybe others will confirm/contradict this.
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04-17-2016, 10:34 PM | #6 |
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Re: Effect of Large Point Gap?
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Middle one, wider gap, opens quicker. |
04-17-2016, 10:52 PM | #7 |
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Re: Effect of Large Point Gap?
"Reducing the point gap ... retards the timing. Conversely, enlarging the gap will advance the timing."
From Marcos web page on how to time the A.
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04-18-2016, 12:41 AM | #8 |
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Re: Effect of Large Point Gap?
This is getting out of control, with all the "what ifs"---Just set the points to .020, set the timing properly & use your spark lever properly.
Bill W.
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04-18-2016, 01:03 AM | #9 | |
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Re: Effect of Large Point Gap?
Quote:
He said "I don't understand THAT thing mate, that was made before I was born!". It's not rocket science. |
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04-18-2016, 01:36 AM | #10 |
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Re: Effect of Large Point Gap?
Wider gap rduces dwell , the time that the points are closed giving time for the coil to charge .
Not so critical on a 4 cylinder, but very critical on a V8 with 8 lobes . Wider point gap will also wear the rubbing block quicker, because of higher spring tension and longer duration on the cam . Wider gap advances igniton, given that the timing is set at the correct gap, and then widened after. |
04-18-2016, 07:53 AM | #11 |
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Re: Effect of Large Point Gap?
Here's some light reading on the issue, grab a coffee and take a gander
http://autorepair.about.com/library/a/1h/bl483h.htm |
04-18-2016, 04:09 PM | #12 |
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Re: Effect of Large Point Gap?
Seems a little odd the points gap got to .030 with the car sitting, as you didn't have a overheat problem before storing it, I think something else is wrong.
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04-18-2016, 04:21 PM | #13 |
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Re: Effect of Large Point Gap?
If you think about it, a larger gap will take a bit longer time for the spark to jump... a time delay...
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04-18-2016, 04:30 PM | #14 | |
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Re: Effect of Large Point Gap?
Quote:
Hope this helps |
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04-18-2016, 05:35 PM | #15 | |
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Re: Effect of Large Point Gap?
Quote:
The Bosch points for a Volvo 4 cyl & the inline 6 cyl looks the same & fits perfectly, BUT, the spring pressure is considerably GREATER on the 6 cyl, to prevent point float @ higher RPM's. Bill Old
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