Well the cigar and what's behind curtain number 3 goes to Michael Porter!!!
As he suggested, I retarded the timing a little and the noise was harder to
bring on. I then dialed it back to 0 degrees and took of the off the vacuum
advance line and bingo.... I could drive really aggressively without a
noise. If I really put it to the floor and cranked it up, I could start
the noise up a little.
I NEED TO GO BACK TO TIMING SCHOOL
When I first did the points and plugs I set the timing statically and
twisted in the turns for advance. Then hooked up the timing light and saw
the timing mark about and 1 - 1 1/4 inch to the right of the pointer. The
car ran great. Since I retarded back to no advance... the engine runs
fine.. sounds a little different.... but pulls strong without the vacuum
advance connected. I can't believe that the engine should be that tolerant
of the vast differences in timing. I did get some afterrun when I turned
off the key after a drive in the retarded setting.
Don't forget from previous post that the distributor is installed off one
tooth to the counter clockwise direction. I don't think this should effect
timing as long as it is turned to the 7:30 position... really don't know. I
will correct on Saturday.
I found something else... I found a cork in the intake manifold fitting for
the PCV valve. Removed and the engine idle increased and I adjusted it back
down. Would this have created abnormal vacuum pressures?
What are the recommendations... buy a new Mallory distributor. Rebuild the
current one. Or learn how to time the engine correctly
Thanks to all you guys that helped with the diagnosis
Brian Sanborn
62 TR4 CT16260L - Groton, MA
sanborn@net1plus.com
-----Original Message-----
From: Michael D. Porter <mdporter@rt66.com>
To: sanborn@net1plus.com <sanborn@net1plus.com>
Date: Wednesday, August 26, 1998 4:22 AM
Subject: Re: TR4 - Engine Noise Problem(long)
>sanborn@net1plus.com wrote:
>
>when I give it lots of gas pedal I hear a loud banging noise that sounds
>like the hood "prop up" rod rattling on the wheel well or something like
>that. There is some added vibration that goes with the added power, but
>not unusual. The noise is not the bearing noise I have heard before in
>my life, which sounds like the muted sound of a hammer on a big anvil.
>
>The car's timing is probably off by a mile with the sloppy distributor.
>This description is precisely that of severe pre-ignition or possibly
>detonation. Way, way too much advance for the load placed on it. If it
>goes through the same rpm range without the noise on very light
>throttle, or the noise diminishes after retarding the static timing,
>that's your answer.
>
>Cheers.
>
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