Hi Mike,
I don't think you should worry so much about this.
It's quite logical the pressure goes up and down with the idle revs.
That the clutch is effecting this can be explained of the fact the pressing
the cluch makes some drag on the main shaft and thereby lowering the revs.
That the idle varies in speed is a thing which can be adjusted (or should
be).
Cheers,
Hans
'71 BGT carpeting
> -----Original Message-----
> From: Mike Lishego [SMTP:mikesl@tartan.sapc.edu]
> Sent: Thursday, November 19, 1998 08:11
> To: MG List
> Subject: Bouncing oil pressure - MGB
>
> Howdy all,
> Tonight while waiting in line at my favorite burger shack, I noticed a
> semi-disturbing problem on my MGB. When I had the car in neutral with the
> clutch out, the oil pressure would bounce from about 55 to 70, almost in
> time with the idle.
> When I put the clutch in, or the car was in gear and moving, the bounce
> went
> away.
> Here's my guesses...The I had the choke in and the car wasn't entirely
> warmed up. When I tried later in the night (when the car was warmer) it
> wouldn't do it. I'm guessing that the engine was running rough, causing
> the
> engine to rock back and forth. This might have put strain on the flexible
> oil hose, causing the pressure to jump up and down by about 15 pounds.
> Or, there could be something catastrophic about to take place in my
> engine when I'm in an economically disadvantaged area, leaving me stranded
> with one blown up MGB. The only sign I see that this won't happen is that
> the oil pressure is going up from it's standard of 50, not down. Not only
> that, the temp has stayed constant.
> I don't know if the car had just started this behavior; I do know that
> my burger was late, which led me to linger over each gauge a little
> longer.
> Bottom line, should I be worried?
>
> Michael S. Lishego
> http://www.geocities.com/MotorCity/Speedway/3706/
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