Exhaust Temperatures - Petrol vs Diesel

Submitted: Wednesday, Oct 14, 2009 at 11:42
ThreadID: 72995 Views:10783 Replies:4 FollowUps:6
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Hi All,

First post so be kind :)

Goes without saying that diesel's run cooler than petrol vehicles - but does anyone have any actual recordings of the temperature difference betwen modern Petrol engines and modern Turbo-Diesel engines at the exhaust?

Cheers,

Pete
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Reply By: Member - Graham H (QLD) - Wednesday, Oct 14, 2009 at 11:55

Wednesday, Oct 14, 2009 at 11:55
I cant tell you the difference but here is what mine runs at.

Engine 4.2 TD 2005 119200k

Probe is 100mm below dump pipe.

Temps 300-325c at 90kph when towing a 2800kg van IN 4TH GEAR

400-425c if towing same van in OVERDRIVE


When not towing temp varies from 250-350c depending on the road.

Fuel consumption stays the same in either gear when towing but car goes best in 4th.

Something to start with

I doubt many petrol motors would need or run an EGT gauge.




AnswerID: 387000

Follow Up By: mazcan barry - Wednesday, Oct 14, 2009 at 12:36

Wednesday, Oct 14, 2009 at 12:36
hi graham
interesting facts but not surprised that 4th is best as a cooler temp puts less stress factors long term on a motor and at the right temp a motor will perr along we used to cover part off the radiator on our tractors in the winter to raise temp a little and they would pull better
egt - is that -exhaust gas test- guage?

and is the probe strapped to the exhaust pipe or inserted or close by on a bracket??

where do you get them from?
and approx price if you dont mind thanking you in advance
cheers and notice after revisiting a previous thread that you where in bunno the other day would have tryed to catch you for a chat
but as they say hard to catch a fast kiwi
cheers barry
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Follow Up By: Member - Graham H (QLD) - Wednesday, Oct 14, 2009 at 12:56

Wednesday, Oct 14, 2009 at 12:56
Exhaust Gas temperature Gauge

-robe is inserted thrua hole in side of exhaust with a threaded nut holding it in place So is absolutely in the firing line of heat.

They are $350 roughly here but with the Aussie $ I would get one from where I got mine Here

http://www.atlanticspeed.com


Mine is a white faced one but would get a black faced one again

Get a Metric one NOT a Farenheit.

Mine was $128 plus postage and is an Autometer Phantom (kit)

Will look tonite and post a pic of mine just on our way ouy


Im in Bussleton now till Monday while I get car serviced

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FollowupID: 654591

Follow Up By: mazcan barry - Wednesday, Oct 14, 2009 at 20:27

Wednesday, Oct 14, 2009 at 20:27
hi graham h
thank you very much for the www.atlanticspeed.com website
it"s the best guage site i have seen and no problems with sending there products to australia autometer are a top brand as well

you name it and they have it not many too chose from though - ROFL

but was almost finished my selection and their website inccurred an error and shut down so have to wait until it"s on again but thanks once again
cheers
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FollowupID: 654640

Follow Up By: Member - Graham H (QLD) - Wednesday, Oct 14, 2009 at 20:55

Wednesday, Oct 14, 2009 at 20:55
No probs pic of my one in my profile second page of pics.

Its a pa\hontom II and the number ends with an M denoting metric

like 4727M is metric 4727 is a farenheit one.

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FollowupID: 654645

Follow Up By: Member - Graham H (QLD) - Wednesday, Oct 14, 2009 at 21:54

Wednesday, Oct 14, 2009 at 21:54
OKMine is a 5744M is a whole kit and on Atlanticspeed is $158 US

I just took inner guard cover off and drilled a hole in side of pipe before I had the new exhaust fitted.

They supply a stainless hoseclip type of clamp and its easy to fit.

Just dont cut the cable.

Cheers Graham 0405390366

Couldnt find u in members list

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FollowupID: 654657

Reply By: Member - Alan H (QLD) - Wednesday, Oct 14, 2009 at 13:25

Wednesday, Oct 14, 2009 at 13:25
I stand to be corrected but I believe the consensus is that LPG exhaust is hotest followed by Petrol with Diesel being the coolest.

Have to be careful for spinifex fires with any exhaust but non-diesels seem to have greater risk.

Alan
AnswerID: 387014

Reply By: Pete Mac - Wednesday, Oct 14, 2009 at 19:54

Wednesday, Oct 14, 2009 at 19:54
Thanks for the info guys! Appreciated - really just wondering how much more susceptible to spinifex fires petrol vehicles are...obviously they run hotter, I was wondering how much hotter?

Cheers,

Pete
AnswerID: 387080

Follow Up By: mazcan barry - Wednesday, Oct 14, 2009 at 20:15

Wednesday, Oct 14, 2009 at 20:15
hi peter
from my farming experiences in the past we were always highly conscious and on alert when using a petrol vehicle in our straw and dry grass paddocks during summer and the old dry spinifex is alway a tinderbox waiting to ignite lights quicker than paper try it some time with a magnifying glass
and would never leave one idling if hot many fires have been started by them
sorry but cant give you a temp figure comparison
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FollowupID: 654639

Reply By: OREJAP - Wednesday, Oct 14, 2009 at 22:01

Wednesday, Oct 14, 2009 at 22:01
Yep, never used petrol vehiciles in the desert always diesel the catalytic converter on petrol vehicles I was told can get up to 1000 celcius. There was a family years ago who stopped at a location to take some photos across a valley in the Vic High country they had driven through some long dry grass previous to stopping. Whilst taking the happy snaps they heard noises behind them & smelt plastic burning turning around they saw their V8 petrol Disco a raging inferno Part of the melted aluminium motor is still on the track today.
AnswerID: 387095

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