Re: 327ci mystery
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Home away from home
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I wonder about the vacuum advance unit could be bad?
Posted on: 2019/6/10 14:35
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Re: 327ci mystery
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Forum Ambassador
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Are plugs 7 & 8 actually firing?
Posted on: 2019/6/10 15:11
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Re: 327ci mystery
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Just can't stay away
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Thank you for your responses. I will check the vacuum advance and try to verify that the 7&8 plugs are actually firing.
Posted on: 2019/6/10 16:51
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Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL '48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk. |
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Re: 327ci mystery
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Just can't stay away
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Dave: I assume that you wanted me to remove each of the 7 k 8 cylinder plugs one at a time and verify that they were each firing on the business end when the engine was running. I did just that and both were sparking at the electrode. Engine sounds like a Model T when running with a plug removed.
I wasn't quite sure how to see if the vacuum advance was functioning properly?
Posted on: 2019/6/11 15:42
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Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL '48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk. |
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Re: 327ci mystery
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Forum Ambassador
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Well, if the plugs are firing and both cylinders have normal compression as you indicate, I don't understand how there could be no discernible difference in engine idle when you short out those plugs. Are you still certain that shorting out 7 and 8 makes no difference in idle?
1, 2, 7, & 8 fire off the same throat of the carburetor, are 1 & 2 firing normally?
Posted on: 2019/6/11 15:54
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Re: 327ci mystery
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Just can't stay away
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Make sure the firing order is correct...
A way to determine a vacuum leak is to squirt brake cleaner at the suspected areas and listen to see if there is a change in the sound of the engine. The cleaner is flammable so be careful. At the distributor remove the vacuum line and plug. Then see if there is a change in the readings. You can also remove the distributor cap and attach a vacuum pump to a line attached to the advance, pull in some vacuum and see if the plate the points ride on moves and stays moved. If the plate moves back there is a hole in the diaphragm. Maybe a leak in the carb to manifold gasket. Just some more ideas....
Posted on: 2019/6/12 14:37
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Re: 327ci mystery
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Just can't stay away
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Thanks, Dave, for hanging in there with me on this one. The number 1 and 2 cylinders appear to be firing normally, as the engine stumbles when either of these is shorted out. However when I short out either number 7 or 8, no discernable change in the idle. I was pulling the plug wires off the plugs before, rather than shorting them out, and assume that the effect is identical? It's almost as though something is blocking the gas/air mixture from reaching the 7 & 8 cylinders, and the vacuum from those two cylinders from reaching the intake manifold; does that make sense? If so, what step could I take to check or remedy that?
Thank you 50 2382 for your directions on how to check the vacuum advance. I'll also check all the plug wires to confirm that the firing order is correct!
Posted on: 2019/6/12 15:46
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Dan Marrin
Summers; Breezy Point, MN, Winters; The Villages, FL '48 Sup8 conv, '48 Sup8Del LWB sed, '58 Hawk. |
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Re: 327ci mystery
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Home away from home
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Good afternoon all...I am wondering if the plastic distributor body is cracked or distorted such that there is no power going to 7 and 8, or if the two plug wires are not conducting...Ernie in Arizona
Posted on: 2019/6/12 19:38
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Caretaker of the 1949-288 Deluxe Touring Sedan
'Miss Prudence' and the 1931 Model A Ford Tudor 'Miss Princess' ![]() |
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Re: 327ci mystery
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Home away from home
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Okay let's see. Good compression, low vacuum.
It's been a while, but doesn't the windshield wiper tap off of the rear most intake runner which feeds cylinders 7&8? So try blocking off the windshield wiper feed.
Posted on: 2019/6/12 19:40
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