The orange color is not known to me, but the lack of power @ higher speed
looks to me as fuel starvation.
Possible causes:
fuel filter clogged
fuel pump failure
clogged fuel line
carb malfunction
Cheers,
Hans
471 BGT
----- Original Message -----
From: <craigw@sonic.net>
To: <mgs@autox.team.net>
Sent: Thursday, September 07, 2006 9:26 PM
Subject: Losing power at high rpms...
> Hi folks. I've got a very high compression MGB. Therefore, I've been using
> premium California fuel (91 octane) & using an NOS octane booster to keep
> my B from pinging under load. It's been working pretty well for the most
> part.
>
> This weekend I was on the freeway in 5th gear doing around 65mph, and
> found that when I increased the throttle, the car actually felt like it
> was losing power. This was the first I've noticed this. The MGB usually
> increases speed etc., at this level.
>
> I got to my destination. Upon leaving, the B started fine and drove fine
> (it seemed) until I put it under load going up a slight grade at around
> 40mph. It felt like maybe a cylinder was 'missing' but not as starkly as
> if a plug wire had been removed. Anyway, I drove it home through town and
> tried not to load it down; kept the revs higher than usual. I parked it
> and just got around to looking at it yesterday.
>
> I removed the plugs and found that they all had a nice, even 'bright
> orange' deposit on them; almost like rust. They smelled normal. I cleaned
> them off & re-installed them. I also removed the fuel filter (which looked
> like it had some orange gunk in it as well) and replaced it too. I took
> the B around the neighborhood and found it still didn't like it when I
> stepped on the throttle upwards of 4000 to 4500 rpms. After around 10
> minutes or so, the car seemed like it was starting to perform normally
> again.
>
> I checked the coolant and it seemed fine. I checked the exhaust and saw
> nothing whatsoever coming out of the tailpipe. The engine is a Glenn
> Towery rebuild which I've had in the car now for 5 years or so, with not
> too many miles on it.
>
> Anyone have a clue what the 'orange' deposits might be?
>
> Thanks, and best regards,
> Craig Wiper
> Santa Rosa, CA
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