Pyrometer safe temps

[davidkerryedwards]

It depends on where the pyrometer is located. It can be before or after the
turbo.
Temperatures of exhaust gases can be about 200 degrees cooler after passing thru
the
turbo. I'd want to keep it below 1200 degrees pre-turbo.
I noticed something interesting this summer when my crossover pipe was failing
and the
turbo not turning as fast resulting in less air to the engine and more black
exhaust. The
pyrometer temperatures went up. With the crossover pipe repaired and a clean
air filter,
the temperatures dropped a couple of hundred degrees.
Prior to the repairs, I would see about 1050/75 at the top of a steep climb like
Raton Pass
on the CO/NM border. I don't think I've seen anything within 150 degrees of
that since
the repair. I dont have oil cooled pistons so I have to keep a closer eye on
the pyro.

Kerry
82 Fc 35
Denver

--- In WanderlodgeForum@yahoogroups.com, "Jay Darst" wrote:
>
> Brother Dan left Huntley, IL (1 hour west of Chicago) headed for
> Maob, UT.
>
> Was on the phone with him as he is traveling thru some hills in
> central IA this morning.
>
> Had a question regarding pyrometer temps. As he crests the bigger
> hills, the pyromter reaches 1,000 degrees. One hill it reached 1,050
> degrees as he made the summit. Interestingly, he was able to
> maintain 55 mph in high gear at the crest. The aneroid valve has
> been adjusted to provide good fuel volume with only light smoke on
> hard pulls.
>
> Is 1,050 for 10-20 seconds too hot?
>
> While off the throttle down the hill, the pyrometer drops to 700
> degrees quickly.
>
> On my PT w/6V92, the pyro never reaches 900 degrees. Wonder if I am
> not getting enough fuel to make it work hard enough to get the temp
> up there?
>
> All comments welcome (except some of the smart ass ones we've had
> more lately)
>
> Thanks
> Jay Darst
> 85PT40
> Springfield, IL sitting at home, traveling vicariously thru my
> brother Dan and his wife Barb who are attending a Land Rover off-
> road event in Moab, UT.
>