Re: rough running at high engine speeds
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Home away from home
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Below is the trouble shooting for loss of power, just remember that just because some thing is new doesn't mean it is good. Also make sure you have good air flow going into the engine and also coming out.
Wes
Posted on: 2017/10/22 10:36
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Re: rough running at high engine speeds
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Forum Ambassador
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It might be worth a quick test without an air cleaner to see if that would have anything to do with the problem.
I have never paid attention to what is in the chamber or silencer behind the filter element but more than one of the old Gus stories had a theme of some kind of baffle or silencing material in air cleaners loosen. When whatever item was free to move and the engine was needing to pull a lot of air at higher speed the item could shift and partially block airflow with results similar to what you describe.
Posted on: 2017/10/22 11:16
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Howard
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Re: rough running at high engine speeds
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Just can't stay away
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Thanks for the input. It's the same when I remove the air cleaner.
Posted on: 2017/10/22 11:19
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Re: rough running at high engine speeds
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Forum Ambassador
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Another hard to find and weird problem with high speed operation was if for some reason the oil pressure increased over the normal maximum, then at sustained higher speeds any weak valve springs would let lifters pump up to the point those valves did not close tightly. When the oil pressure was back in proper range the lifters reverted back to their normal bleed down and all was well again.
Can't really see that happening but since you have looked at all the usual and do have hydraulic lifters, it might be worth looking at weird. Verifying with a known good gauge if the oil pressure is stable and staying in the same range as when the engine is OK would be easy enough to do. The pressure regulator valve could have started sticking or acting up.
Posted on: 2017/10/22 11:49
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Howard
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Re: rough running at high engine speeds
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Just can't stay away
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Have you checked to see if the mechanical advance is working?
Find someone with an old SUN dist. machine and have them test it. I find that when there is no mechanical advance the engine starts to give up at about 45-50 MPH. A quick check is to watch the timing mark on the vibration damper with a timing lite while someone revs the engine, you should see the timing marks advance. If you suspect a mechanical advance problem and can't find a SUN machine contact me as I have one, and am willing to help out. Sincerely, John
Posted on: 2017/10/22 12:07
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Re: rough running at high engine speeds
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Home away from home
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Loosen or remove gas cap and try again.
Also need to open up the points to .018. At this point i will not go into alot of detail. I've had a similar problem with a 2.0 Ford 4cyl. It turned out to be somekind of a wax or parafin building on the EXH valves on the TAPPEt side of the valve stem. I wuit running the convenient local Marathon and (by sheer hapenstance) began to run Shell. Problem 90 % solved in less than 3 tank fulls. Again i'm leaving out alot of detail and direct analysis and actual cleaning of the valves with a wire brush that took place over a period of about 4 years that this sticking exh valve problem had existed and only got WORSE over the 4 years.
Posted on: 2017/10/22 12:11
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: rough running at high engine speeds
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Home away from home
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Just to be sure, does the Vacuum Advance need to be
Just asking. Wes
Posted on: 2017/10/22 12:26
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Re: rough running at high engine speeds
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Home away from home
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Oh, another one of the old Gus stories was a collapsing fuel line going to the fuel pump.
Wes
Posted on: 2017/10/22 13:36
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Re: rough running at high engine speeds
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Several other things already mentioned that should come first but don't ignore the function and adjustment of the metering rods.
Posted on: 2017/10/22 14:26
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