I went out with a friend a few weeks ago in his small airplane. The engines
in these things are interesting. It was a brand new engine, flat 6 and
carbureted. It could also run with no electrical system (on magnetos). One
of the gauges he had was for exhaust gas temp and he also had a little knob
that controlled the air/fuel mixture. As he flew he would adjust the mixture
to try to get the temp to the highest it would go - that was the most
efficient. He also just set the throttle at around 2500rpm and left it
there, unlike driving a car. It was an interesting trip.
Roadster content: I started cleaning out and removing parts from the donor
body, still a long way to go though.
-Mitch Planck
'69 1600
'70 1600
-----Original Message-----
From: owner-datsun-roadsters@autox.team.net
[mailto:owner-datsun-roadsters@autox.team.net]On Behalf Of Chris Coker
Sent: Tuesday, April 29, 2003 5:44 AM
To: Datsun Roadsters List (E-mail)
Subject: Re: Installation of Exhaust Gas Temperature Gauge.
It is critical that the EGT probes be placed the proper distance from the
exhaust valve - otherwise the temperature readings will be meaningless.
Gasses will be much too cold at the collector. The general rule of thumb
I've seen is roughly 4-6" from the exhaust valve opening. That's where I've
placed the EGT's on my 1600 race car. I'm using cylinders 1 and 4 for my
measurements, but to really know which ones are the leanest, you would need
to measure all four collectors.
I must add that it's been one of the most helpful tools I've had in the race
car. It is great for checking carb mixture balance.
Expect to see temps between 1350-1450 degrees F when everything is good. As
you start to go lean, the temps will skyrocket. At 1600 you're about ready
to burn a hole in a piston. If you go rich, the temps will cool off.
However, there's a crossover point at which temps will begin to cool off if
you go way, way too lean. In my experience, you'll feel the drop off in
power before this happens, though.
Also, the engine must be under load for the temps to make any sense.
Regards,
--
Chris Coker
69 1600 SPL311 <http://mywebpages.comcast.net/chriscoker/roadster.html>
66 1600 GP Race Car www.risensonracing.com
Royal Oak, MI
> From: Graeme Suckling <graemes@saonline.com.au>
> Reply-To: Graeme Suckling <graemes@saonline.com.au>
> Date: Tue, 29 Apr 2003 11:29:58 +0930
> To: 'Guy & Pamela Pepoy' <gppepoy@cybertrails.com>, "Datsun Roadsters
List
> (E-mail)" <datsun-roadsters@autox.team.net>
> Subject: RE: Installation of Exhaust Gas Temperature Gauge.
>
> Guy, I think the Roadster pre-dates the manufactures instructions by
> several decades.
> I would treat it like an O2 sensor and mount it at the closest point
> to the engine headers where all 4 cylinders can be monitored i.e. the
> collector pipe.
> I can't see the point in restricting the sensor to less than the full
> tote of exhaust gasses.
> Regards,
> Graeme Suckling
> 1965 SP310 - under construction DSOA Member # 112
> 1971 P510 4 door - daily driver, original owner, highly modified.
> 1972 PL510 2 door - in storage.
> 1973 HS30/240Z - re-building to 2003 specs.
> www.imagestation.com/mypictures/index.html
> Adelaide, South Australia.
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