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duc944
Samba Member
Joined: October 21, 2017
Posts: 13
Location: ma
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 Posted: Sat Feb 10, 2018 5:27 pm Post subject: Exhaust temp guage? |
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Hello all,
I know many run with a cylinder gauge but I'm wondering if any are using an exhaust temp gauge? I would think it to be a better long term install over the under the #3 spark plug.
What would be a good running temp?
thanks |
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hitest
Samba Member
Joined: September 30, 2008
Posts: 10296
Location: Prime Meridian, ID
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| Posted: Sat Feb 10, 2018 5:56 pm Post subject: Re: Exhaust temp guage? |
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Your answers should vary widely. Unless you specify the type/brand/style of exhaust you are running and the entire breakdown of your engine build parts- you will have absolutely no idea what is normal.
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| EverettB wrote: |
I wonder what the nut looks like.
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'62 L390 151, '62 L469 117, '63 L380 113, '64 L87 311, '65 L512 265, '65 L31 SO-42, '66 L360 251, '68 L30k 141, '71 L12 113, '74 ORG 181
FU#5 |
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Pruneman99
Samba Member
Joined: February 22, 2012
Posts: 5013
Location: Oceanside
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| Posted: Sat Feb 10, 2018 6:08 pm Post subject: Re: Exhaust temp guage? |
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EGT (exhaust gas temperature) gages are common in light aircraft. They have the ability to change the air/fuel mix from the cockpit. Actually it's necessary due to altitude changes either manually, or computer controlled.
You can get one (non-certified (cheaper)) on eBay or the like. IDK what the range is susposed to be, but you could talk to some people that run VW aircooled engines in aircraft to get a basic safe range. Obviously it would be different for a engine driven on the street at different loads, but a baseline for cruising could be established. And the gages just look cool! |
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scrivyscriv
Samba Electrician
Joined: October 04, 2011
Posts: 2922
Location: Memphis
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| Posted: Sat Feb 10, 2018 8:21 pm Post subject: Re: Exhaust temp guage? |
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I can't remember the specifics, it's been a few years since A&P school recip engines, but the CHT and EGT work together to indicate engine load and mixture richness. If you only have one, choose a CHT.
We terrestrial folks set mixture richness on the carburetor with main jets and emulsion tubes.. using a wideband air/fuel ratio meter to tune, ideally. Pilots on the other hand set mixture manually depending on cruise or climb power. You tweak the mixture leaner and leaner until the CHT gets to its highest reading, then starts to drop. At that point you've established peak EGT, and adjust the mixture slightly to get slightly lean of peak or rich of peak, depending on what your purpose is.. fuel economy or long engine life.
CHT indicates how much work the engine is performing.. EGT indicates how rich or lean the mixture is. So ideally one would never really need an EGT in normal driving conditions
Off the top of my head I am thinking 1200 degrees Fahrenheit is a normal EGT.
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Robert in Memphis
Dünkelgrügen 1967 Java Green bug thread
Engine rebuild thread
If you're ever in the Memphis area, you are welcome to stop by for advice and help. |
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Max Welton
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Joined: May 19, 2003
Posts: 10697
Location: Black Forest, CO
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duc944
Samba Member
Joined: October 21, 2017
Posts: 13
Location: ma
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| Posted: Wed Feb 21, 2018 8:55 pm Post subject: Re: Exhaust temp guage? |
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| thanks for the insight |
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