EGTs and pyros

jcolvin · Post by **jcolvin** » Tue Oct 18, 2011 8:00 pm

Those of you with a pyrometer and stock fueling (ie fuel not turned up), what are the max EGTs you are seeing at full-throttle hill climbs? Most vehicles are set up from the factory such that you won't over-heat the head or turbo with full throttle, and a pyro is only necessary if over-fueling. Since I'm not planning on turning up the fuel, I'm not sure i need a pyro. Anyone getting >1150 - 1200 F pre-turbo with stock fuel on long full-throttle hill climbs?

jessef · Post by **jessef** » Tue Oct 18, 2011 8:02 pm

jcolvin wrote:Anyone getting >1150 - 1200 F pre-turbo with stock fuel on long full-throttle hill climbs?

Nope (four different L400's)

jcolvin · Post by **jcolvin** » Thu Oct 20, 2011 1:08 pm

jfarsang wrote:
jcolvin wrote:Anyone getting >1150 - 1200 F pre-turbo with stock fuel on long full-throttle hill climbs?
Nope (four different L400's)

That's encouraging. I don't think I'll bother with a pyro then.

thedjjack · Post by **thedjjack** » Thu Oct 20, 2011 1:37 pm

On my stock L300 I have hit 1125 before I let-up pre-turbo....I bet I could hit way more if the air-filter is dirty....

I personally think all Diesels should have one (all small planes do)....

Airgonzo · Post by **Airgonzo** » Thu Oct 20, 2011 2:40 pm

I personally think all Diesels should have one (all small planes do)....[/quote]

That's actually not true. Some small planes have EGT gauges, but many do not. However, small piston-powered aircraft are almost exclusively gas-powered, not diesel. Many are super or turbo-charged, however.

thedjjack · Post by **thedjjack** » Thu Oct 20, 2011 2:56 pm

Airgonzo wrote:I personally think all Diesels should have one (all small planes do)....

That's actually not true. Some small planes have EGT gauges, but many do not. However, small piston-powered aircraft are almost exclusively gas-powered, not diesel. Many are super or turbo-charged, however.[/quote]

OK that is true not all small planes have them (most I fly in do (as a passenger for work))...but not all piston powered planes run on gas there are a few diesel planes out there and growing.

Plus diesel have opposite properties of gas engines and makes EGT gauges a really good idea...more you press the throttle the more heat they make...

Each their own...but for $140.00 ish it is cheap insurance...

I changed my air filter today after this post because the last little while my EGT was way up around town (it was seriously dirty!!! looked clean till I banged it on the ground).

Airgonzo · Post by **Airgonzo** » Thu Oct 20, 2011 4:44 pm

I wasn't trying to make an anti-pyro argument. I agree that they are very useful in a Delica and I put one in my L400 last summer and was very glad to have it on a few trips over the Coq and the Highway 3.

You're right, there are some piston-pounder diesel aircraft out there but they are very rare and EGT gauges in aircraft are used more for setting mixture, not power settings.

thedjjack · Post by **thedjjack** » Thu Oct 20, 2011 5:50 pm

No worries... I was just having fun with it (bored trying to get work done today)

What do you fly?

Airgonzo · Post by **Airgonzo** » Thu Oct 20, 2011 6:54 pm

Turbine Otter (DHC-3T). Who are you flying with for work? What do you do?

thedjjack · Post by **thedjjack** » Thu Oct 20, 2011 8:55 pm

I do not fly as much anymore...lots of forest health aerial surveys, aerial photography, etc.... Single engine piston Cessnas: 172, 205, 206, and my favourite 185...

Mostly up in the interior...

I can land but it is not graceful!

mararmeisto · Post by **mararmeisto** » Thu Oct 20, 2011 9:19 pm

jcolvin wrote:Those of you with a pyrometer and stock fueling (ie fuel not turned up), what are the max EGTs you are seeing at full-throttle hill climbs? Most vehicles are set up from the factory such that you won't over-heat the head or turbo with full throttle, and a pyro is only necessary if over-fueling. Since I'm not planning on turning up the fuel, I'm not sure i need a pyro. Anyone getting >1150 - 1200 F pre-turbo with stock fuel on long full-throttle hill climbs?

If you don't down-shift, 1200 F can be acheived.

I do think a pyro is a good idea, especially for those who tow.

And for those with a heavy right foot.

And for those who drive these diesels like Skylines.

But mostly for those who tow.

Mephisto · Post by **Mephisto** » Fri Oct 21, 2011 8:35 am

I drive a standard 4M40, if I don't pay attention to what gear I'm in I could easily get above the danger point. That was when it was stock, I've played with it a bit and can hit those levels even faster now. Off road is the worst, I tend to drive my Paj like a skyline off road, and with the extra noise and extra attention being paid to the road there have been many times I've looked down and seen over 1400. If you give it at all at lower RPMs the EGTs are dangerous right away. I also have my probe directly in the collector of the exhaust manifold, I suspect that the readings could be slightly lower if the probe is in the EGR block off plate, as the probe doesn't seem to be in the direct flow unless installed at an angle on the 4M40. This is why I went to the trouble of drilling and tapping the actual manifold, as the highest temps will only be seen where the maximum exhaust flow is.

EnviroImports.com · Post by **EnviroImports.com** » Sun Oct 23, 2011 6:19 pm

Pyros are so much more important than for just not overheating when your foot in on the pedal, but when you pull over to stop you need to let your turbo cool down because of the heat in the turbo working away at cooking the bearings in your turbo, your oil pump and water pump are taking the heat away from your turbo's bearings, if you pull over and shut off your motor and leave it at 600*,700*, 900* ++++ degrees, you WILL over time KILL your turbo, and its not like you are the first owner of this van, its 15 years old or older .

Delica Canada | Mitsubishi Van Club

EGTs and pyros

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