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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 07-04-2011, 04:48 PM   #1 (permalink)
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When is running hot, actually too hot?

With the recent spell of sunny weather here in the UK pushing ambient temperatures up into the low 30s Celsius (86 F), I noticed that by the time I finally arrived at my office in central London, the engine temp had gone up to a whopping 110 degrees Celsius (230 F).

Ive got one of the engine mounted temp gauges, similar to these from New Bonneville.

http://www.newbonneville.com/html/oil_temp_gauge.html

The bike really felt hot (as did my leg) and I noticed after I parked-up the gauge just entered the red zone at a max of 112 Celsius (234 F)

Tell me Im not alone in reaching these kind of engine temps in stop / start city traffic, are you boys in California, Arizona, New Mexico reaching these kind of temperatures with no ill side-effects, Forchetto what about you in Spain ?

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Steve
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Old 07-04-2011, 04:56 PM   #2 (permalink)
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I don't have any gauges to measure engine or oil temperature but I consistently ride in temperatures here in Colorado and in New Mexico 95-100 degrees F with no ill effects. This would be a combined stop and go in the city and cruising on open roads 70-80 mph. If I were you I would enjoy the nice weather and not be concerned with the temperature of your bike...hahaha

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Old 07-04-2011, 05:57 PM   #3 (permalink)
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No temp gauge either, but with last week's temps in the 110 F range (~ 45 C I would guess) the Bonnie seemed fine. I think modern oils and metallurgy combined with the oil cooler contribute to very durable bikes. Combination of stop/go and freeway riding.
I remember some of my old air-cooled VW's would get hot enough for the oil light to flicker at idle in similar temps.
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Old 07-04-2011, 07:28 PM   #4 (permalink)
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worried about low 30's? pfft thats the perfect temperature

I have rode mine in temperatures up to 47 C and certainly often over 40 C in stop and go traffic as well as long country runs at speed for over 200 kilometers

must admit I asked the same question ages ago as was worried about the same thing, but the general consensus on this forum was it would be ok and 50,000 kilometers later my bike runs well

during the summer my bike is often still hot to touch many hours after the engine has been shutdown
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Last edited by bonza; 07-04-2011 at 07:30 PM.
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Old 07-04-2011, 09:05 PM   #5 (permalink)
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With the recent spell of sunny weather here in the UK pushing ambient temperatures up into the low 30s Celsius (86 F)
July in Texas - 86 is considered a cold front! Regularly ride at 100+ and don't even think about it.
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Old 07-05-2011, 12:02 AM   #6 (permalink)
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Forchetto what about you in Spain ?
I live in one of the cooler parts of Spain. Oil temperature depends not just on ambient temperature but the sort of riding conditions.

In 30C ambient and riding on minor roads I'll get just over 90C and it seems to stay there. As soon as I get on a motorway, just a few miles of high speed running raises this to over 100C.
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Old 07-05-2011, 03:56 AM   #7 (permalink)
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worried about low 30's? pfft thats the perfect temperature

I have rode mine in temperatures up to 47 C and certainly often over 40 C in stop and go traffic as well as long country runs at speed for over 200 kilometers
47C !! - Bonza, I take my hat off to you, I think Id be more worried at me cooling down at that temp rather than the bike (still, good excuse for a few tinnies, eh?).

Good to know that the motors are built to take a bit of punishment. Memories of an old Lancia sports car keep coming back, where 15 degrees over-temp and it was time to re-skim the head (again)...

Happy days, cheers, Steve
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Old 07-05-2011, 07:29 AM   #8 (permalink)
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47C !! - Bonza, I take my hat off to you, I think Id be more worried at me cooling down at that temp rather than the bike (still, good excuse for a few tinnies, eh?).

Good to know that the motors are built to take a bit of punishment. Memories of an old Lancia sports car keep coming back, where 15 degrees over-temp and it was time to re-skim the head (again)...

Happy days, cheers, Steve
yes, I remember the day well. it was a couple of summers ago now. thought I was going to expire, but the bike was going strong as an ox. left work to head home and it was like riding in a blast furnace. checked the thermometer on the back verandah when I got home and 47 c in the shade and sure enough it was confirmed on the weather report. the next day the whole state went up in flames and about 200 people were killed.

but that was an extreme day. however have ridden during low 40's many, many times

BTW, my partner is living in the UK for next couple of years due to work and has found the weather over there hot lately
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Old 07-05-2011, 08:05 AM   #9 (permalink)
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Quote:
Originally Posted by Steve Block View Post
47C !! - Bonza, I take my hat off to you, I think Id be more worried at me cooling down at that temp rather than the bike (still, good excuse for a few tinnies, eh?).

Good to know that the motors are built to take a bit of punishment. Memories of an old Lancia sports car keep coming back, where 15 degrees over-temp and it was time to re-skim the head (again)...

Happy days, cheers, Steve
I can attest to hot Aussie summers being more of a challenge for rider than engine - especially in traffic when the temp is 40+

My top tips for rider temp management.

Completely wet a t shirt and wear under a mesh (armoured) jacket - dianese do a nice one that gets great airflow. Lasts about 20 mins on a really hot day and more water poured over you tops it up. I've stopped and helped myself to a few garden hoses on occasions! This works great on thighs too.

Place some freezer packs in your armour pocket (back protector) and front pockets (the ones used for injuries that are flexible work really well and can be recharged at work/home).

Get a gel-filled neck band and keep wet, in the fridge, wear whilst riding.

I commute every day, in Draggin jeans, boots and jacket and full face helmet, and in hot weather the combo of the freezer packs and a wet tshirt makes the bike seem almost air conditioned despite all the gear. I can contemplate a 'just for fun' ride when it's really hot if I douse liberally and ride 'moist'.

Hot weather seemed slightly more tricky on my old bike (CBR1000) - when that second radiator fan kicked in I was bathed in hot engine heat at the lights.
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Old 07-05-2011, 08:54 AM   #10 (permalink)
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Get rid of the temperature gauge and then you won't have anything to worry about!
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