Date: 28-03-24  Time: 20:37 pm

Author Topic: Engine surface temperature  (Read 2003 times)

vinnyb

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Engine surface temperature
« on: 04 April 2017, 08:04:13 pm »
 Just out of interest, does anyone know what sort of maximum surface temperature the head and barrels reach on our engines?
« Last Edit: 04 April 2017, 08:05:08 pm by vinnyb »

vinnyb

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Re: Engine surface temperature
« Reply #1 on: 06 April 2017, 07:37:11 pm »

Gonna buy me an infra red thermometer, they're only about a tenner on Amazon. I can find out myself then.
« Last Edit: 07 April 2017, 05:30:29 pm by vinnyb »

Bretty

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Re: Engine surface temperature
« Reply #2 on: 07 April 2017, 08:09:27 am »
Good idea, run the engine with the bike on the stand until the radiator fan comes on. I assume that's as hot as it will get.
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Jules-C

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Re: Engine surface temperature
« Reply #3 on: 07 April 2017, 03:37:09 pm »
Thermostat meant to start opening at 80.5 and be fully open at 95.  Fan switch will be set for just over 95 and rarely (if ever) comes on so coolant temp no normally above 95 so wouldn't expect cylinder head external surfaces to be higher than that.  My guess is about 90 normally.

vinnyb

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Re: Engine surface temperature
« Reply #4 on: 07 April 2017, 09:17:28 pm »

  Thanks Jules, I'm ordering a -50 to 550°C thermometer in the next couple of days so I'll find out for sure. I'll let you know when I know, if you're interested. :thumbup

fazersharp

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Re: Engine surface temperature
« Reply #5 on: 07 April 2017, 09:40:45 pm »
While you are playing I would like to know the temp of the headers especially the collector where despite my best efforts the paint always flakes
I don't do rain or threat there of. dry rider only with no shame.

limax2

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Re: Engine surface temperature
« Reply #6 on: 07 April 2017, 09:46:51 pm »
I have one of those infra red thermometers and will be out on the bike tomorrow so if i remember I will take it with me and check when I stop. Never thought of it before but it will be interesting to find out. Don't fancy doing it while riding  :eek .
I have a water temperature gauge on the FZS600 and it usually hovers around 80 to 85 deg C. Soon after stopping it sometimes gets to about 90 with heat soak into the water without air flow or circulation.
« Last Edit: 07 April 2017, 09:48:47 pm by limax2 »

vinnyb

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Re: Engine surface temperature
« Reply #7 on: 07 April 2017, 11:30:58 pm »

 Cheers Limax, A thermometer that only reads up to 550°C will be nowhere near high enough to read the temperature of the header pipes Sharpie, I think they get to about 800 -900°C +  The slightest amount a rust will have the paint flaking off. I wonder if something like Jenolite which converts the rust into iron tannate, would be worth trying before repainting it. I've just been looking at something called corroseal, it maybe worth googling.
« Last Edit: 07 April 2017, 11:51:25 pm by vinnyb »

Fazerider

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Re: Engine surface temperature
« Reply #8 on: 08 April 2017, 04:45:40 pm »

I got a reading of 90º from the cylinder head last night, though it may have been higher as the last 8 miles of my commute is a gentle 40mph bimble.
The reading for the bottom of the engine was just 50º (40º above ambient) which was cooler than I’d expected.

vinnyb

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Re: Engine surface temperature
« Reply #9 on: 08 April 2017, 10:30:14 pm »
Me too, don't know what it would be like in he heat of the UK :lol  but even if it stays at 40°C above ambient the engine covers could be sprayed in standard rattle can black with no problems couldn't they? I always thought  :faz s were cool, now I know :thumbup

darrsi

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Re: Engine surface temperature
« Reply #10 on: 08 April 2017, 11:01:53 pm »
Getting pipes on to do a carb balance after engine fully warmed up.


Hot......hurts.  :lol
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vinnyb

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Re: Engine surface temperature
« Reply #11 on: 08 April 2017, 11:13:04 pm »
 It's not hot, It's a :faz ....It's COOL :lol

Fazerider

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Re: Engine surface temperature
« Reply #12 on: 09 April 2017, 10:06:08 am »

 Cheers Limax, A thermometer that only reads up to 550°C will be nowhere near high enough to read the temperature of the header pipes Sharpie, I think they get to about 800 -900°C +  The slightest amount a rust will have the paint flaking off. I wonder if something like Jenolite which converts the rust into iron tannate, would be worth trying before repainting it. I've just been looking at something called corroseal, it maybe worth googling.

If the headers were that hot they’d glow dull red in the dark. The surface oxidation on mine is a yellow-brown colour which suggests they reach about 250ºC.
If you have shiny stainless pipes an infra-red thermometer will not get a reliable reading, they really need a black surface.

vinnyb

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Re: Engine surface temperature
« Reply #13 on: 09 April 2017, 10:42:54 am »
 Sorry Fazerider you're probably right, just reading on various forums, it seems the headers reach about 700°F. I'll check when I get my new toy :)

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Re: Engine surface temperature
« Reply #14 on: 09 April 2017, 11:08:39 am »
When I changed my coolant I ran through some cleaner and you are supposed to run the engine until the fan kicks in, but it never came on and after about 15 min ticking over and got bored waiting and gave up.

I posted here about it and I dont think anyone has had the fan come on during any riding, maybe there was one who had it come on in a massive traffic jam in the middle of summer.

 
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limax2

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Re: Engine surface temperature
« Reply #15 on: 10 April 2017, 12:43:47 pm »
As promised here are my results.
About a minute after a 5 mile run in the cool morning air:-
Cyl. head 85
Barrel just above crankcase 75
Ex. pipe near head 165
collector 75
Water temperature 80 after stopping. Just below 80 before stopping.


After 45 miles by which time it was about 18 deg. ambient and a bit of slow riding to a parking space at Oulton Park :-
Cyl. head 97
Barrel above crankcase 87
Ex. pipe near head 165
Collector 82 - 103 depending where I measured it.
Water temperature 85. Was showing 80 before I stopped the engine.


I was a bit surprised to find the fins on the cylinder head a bit hotter than the water temperature in the thermostat housing. That is where the temp. probe is situated in place of the switch probe.


The silver head cover measured 67 and my mates FZS1000 cyl head measured a bit cooler than my 600. But then he probably thinks he is cooler than me anyway  8)

vinnyb

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Re: Engine surface temperature
« Reply #16 on: 10 April 2017, 10:01:35 pm »

As promised here are my results.
About a minute after a 5 mile run in the cool morning air:-
Cyl. head 85
Barrel just above crankcase 75
Ex. pipe near head 165
collector 75
Water temperature 80 after stopping. Just below 80 before stopping.


After 45 miles by which time it was about 18 deg. ambient and a bit of slow riding to a parking space at Oulton Park :-
Cyl. head 97
Barrel above crankcase 87
Ex. pipe near head 165
Collector 82 - 103 depending where I measured it.
Water temperature 85. Was showing 80 before I stopped the engine.


I was a bit surprised to find the fins on the cylinder head a bit hotter than the water temperature in the thermostat housing. That is where the temp. probe is situated in place of the switch probe.


The silver head cover measured 67 and my mates FZS1000 cyl head measured a bit cooler than my 600. But then he probably thinks he is cooler than me anyway  8)
Wow. that's much cooler than I expected. It'd be interesting to try it again in the height of summer to see what difference in ambient make to running temperatures. Thanks for that. :thumbup
« Last Edit: 11 April 2017, 06:17:21 pm by vinnyb »