Air-cooled vs liquid-cooled.

**SPman** · 27th December 2007, 18:36

Originally Posted by Big Dave

What.....the.......fuck.......?

I get around............

**Motu** · 27th December 2007, 18:41

All engines are oil cooled,the most important job of oil is heat transfer - run an engine without oil and some components will seize.What happens when two metal components seize is that the two parts overheat and melt.But some engines are designed to use the oil for more of it's heat transfer ability.

Actualy oil is not as good as water for heat transfer - heat an iron bar to red heat and quench it in water for 10 seconds,then grab the hot end.Now try the same quenching in oil.....you'll burn your hand for sure,it doesn't transfer the heat to the liquid as fast.But that slower heat transfer is more controllable and is used with good effect in heat treatments.

**McJim** · 27th December 2007, 19:28

We have 2 air cooled bikes in the garage. 1997 Ducati 600ss & 2006 Suzuki GSX750F.

No complaints.

**Big Dave** · 27th December 2007, 19:28

Originally Posted by SPman

I get around............

In a Tutu.

**limbimtimwim** · 27th December 2007, 21:15

Originally Posted by Motu

The rear cyls run hotter than the front,but not enough to really worry about.

Tell that to Erik Buell!

WHOOOOOSSSSSSSSSSSSHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH goes the Buell switched off at the top of a hill.

Hey that rhymes.

**xwhatsit** · 27th December 2007, 21:26

Kind of related.

Still trying to get to the bottom of my 250RS hot-starting-of-doom and `what's an idle?' situation.

What sort of temp would be normal for an air-cooled bike? I want to measure how hot it's getting and see if overheating is the problem.

**Motu** · 27th December 2007, 22:12

Originally Posted by limbimtimwim

Tell that to Erik Buell!

Some V twins,eg Honda - use different cam and ign timing,also different carb jetting for the rear cyl to compensate for the hotter running......or does the front cyl have different timing and mixture because it runs cooler? Any way,the makers know about these sort of things and do these little tricks without telling us.....get your cams and carbs mixed up and it'll run not just right.

**Big Dave** · 27th December 2007, 22:16

Originally Posted by limbimtimwim

Tell that to Erik Buell!

WHOOOOOSSSSSSSSSSSSHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH goes the Buell switched off at the top of a hill.

Hey that rhymes.

They don't have to be switched off. Some pussies grizzle about it too. 'ooooh it's got a fan.'

It doesn't bother me at all - I see it as better than boiling the oil - and the mass centralisation works so well that it's a small price to pay for the rear cylinder being enclosed.

The Rune and the Concours have similar fans.

I have an interview with Erik coming up in February - anything else you'd like passed on?

Imagine a very large man in black leather and

**limbimtimwim** · 27th December 2007, 22:22

Originally Posted by Big Dave

They don't have to be switched off. Some pussies grizzle about it too. 'ooooh it's got a fan.'

I don't think it's bad. It was just pointing out that Buell cared enough to have the fan run when the engine was switched off.

Hey you own one, does the fan go with the kill switch in the off position?

When you do interview Erik, thank him for making bikes people argue about.

**limbimtimwim** · 27th December 2007, 22:27

Originally Posted by Motu

Some V twins,eg Honda - use different cam and ign timing,also different carb jetting for the rear cyl to compensate for the hotter running......or does the front cyl have different timing and mixture because it runs cooler? Any way,the makers know about these sort of things and do these little tricks without telling us.....get your cams and carbs mixed up and it'll run not just right.

Going off topic a bit 'ere, but the suggested mains for the jet kit in my nc35 put the leanest jet in the left rear cylinder. You'd think that'd be the hottest cylinder, so why stick the leanest jet in it? Seems to work just fine though.

**Ocean1** · 27th December 2007, 22:29

Originally Posted by Big Dave

I have an interview with Erik coming up in February - anything else you'd like passed on?

Yes.

Ask him why the 1125r has to look like the bastard get of prince charles and an F16.

**Big Dave** · 27th December 2007, 22:31

Originally Posted by limbimtimwim

I don't think it's bad. It was just pointing out that Buell cared enough to have the fan run when the engine was switched off.

Hey you own one, does the fan go with the kill switch in the off position?

When you do interview Erik, thank him for making bikes people argue about.

I wasn't finger wagging. just sayin'

**Big Dave** · 27th December 2007, 22:34

Originally Posted by Ocean1

Yes.

Ask him why the 1125r has to look like the bastard get of prince charles and an F16.

I have 4 prints done as samples at the moment.
4 people who's opinions I respect like a different one best.

' When you do interview Erik, thank him for making bikes people argue about.'

Genius.

**limbimtimwim** · 27th December 2007, 23:08

Originally Posted by Ocean1

Yes.Ask him why the 1125r has to look like the bastard get of prince charles and an F16.

As I have read in a print publication of late, the new thing is only the first thing to be based on that engine and chassis. I guess there will be more laid back 1125 (1125S ?) missing the scoops and a more powerful one with all the trimmings (1199YCAISE (You Can't Afford It Special Edition) ?) in a couple of years to have a stab at superbike.

Originally Posted by Big Dave

' When you do interview Erik, thank him for making bikes people argue about.' Genius.

I'm quite serious. If Buell were to go away all of a sudden things would be less interesting.

Discussing music the other evening it was mentioned the proof of a good band was that another band might mention as an influence or make nod towards the other. I think it is fair to say that without Buell the SuperDuke, Yam MT-01, HyperMotard or maybe even the R1200S might not exist. Maybe, or maybe not, Buell broke ground for the others in this regard.

Anyway, way off topic. I'm off to drink some glycol to prove it's environmentally friendly really and all that stuff about it being poison isn't true.