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Small block bevel drive - temperatures

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Simmoto View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simmoto Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 19:08
Moly, who knows? But that 85/140 is like treale when cold so I figure a squirt of Moly cant hurt.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bugsy Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 19:17
Ok Simmoto, help me here please - what form is the moly in?
Ron

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Motty Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 20:07
Originally posted by Bugsy Bugsy wrote:

Ok Simmoto, help me here please - what form is the moly in?

The stuff I used comes in a tube
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 20:51
I use Eurol 75w140 LS , no additives. in the bevel box.
Nigel
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 20:57
Originally posted by jefrs jefrs wrote:

A cheap infra-red (IR) thermometer is a useful tool. 

Damn  , does that mean I have to go and buy a cheap one too?....Wink
Nigel
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bugsy Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 21:13
Ahh, thanks, a face to the Moly name.

Blimey, Eurol make a few gear oils don't they? What do you pick for the gearbox then Nigel?
Ron

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 15 Oct 2018 at 22:36
Yep ended up using 85/140 + moly (from a tube as above) in my 850 big block. I did notice a difference in temperature of the FD casing after a run, luke warm vs (previously) too hot to touch.




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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simmoto Quote  Post ReplyReply Direct Link To This Post Posted: 16 Oct 2018 at 14:15
i just use the stuff on ebay, about £4 for 20cc which does two smallblock changes
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 16 Oct 2018 at 20:31
Originally posted by Bugsy Bugsy wrote:

Ahh, thanks, a face to the Moly name.

Blimey, Eurol make a few gear oils don't they? What do you pick for the gearbox then Nigel?

75w 90 Fultrasyn from their  advisor.   I use the same in my Bm although it also uses it in the bevel box .  I haven't always used the fully synthetic in the Bm and at  just under 100k miles the bevel box became rough and noisy . ( so I'm not sugggesting it's better or worse than anything else  just that it's easily available locally from a relative at the right price...)  I think its the front bearing  but I replaced  the complete unit  with a spare I had and haven't stripped the old one yet. 
Nigel
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'04 Breva 750, '99 Bmw R1100S, '06 Triumph Bonneville '05 CBF 250, '03Bullet 65 500, '93 MZ301 Saxon fun
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adam Quote  Post ReplyReply Direct Link To This Post Posted: 16 Oct 2018 at 20:56
After approximately 10 miles riding home this evening, air temperature at 15`C I checked the bevel drive and it was about the same temperature as a hot cup of tea, which I had in my other hand for reference. Recommended oil in drive. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bugsy Quote  Post ReplyReply Direct Link To This Post Posted: 16 Oct 2018 at 23:40
Thanks Adam - no moly by the sound of it...

Any one else with Nigel and using 75W 90 in the gearbox? Any comment on gear change quality?
Ron

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Simmoto Quote  Post ReplyReply Direct Link To This Post Posted: 17 Oct 2018 at 05:35
Intetesting to hear the temps people are getting, its quite difficult to generalise on what it means  as there are a couple of heat sources; friction from the brakes and friction from the bevel and pinion gears both of which will vary depending on the ride and rider. Unless anything is really glowing hot I doubt any of it is an issue; the role of the oil in the box is to lubricate and also to conduct heat away.

Im off to look for a cheap thermometer for the hell of it anyway Smile

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Post Options Post Options   Thanks (0) Thanks(0)   Quote nab301 Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2018 at 19:23
Just for comparison  I checked the temps  on my Bmw R11s 
Slightly warmer air temps than original Breva test ,  did a round trip of approx  100 miles
  Bevel  box  30 deg c
 Brake Discs,    less than 20deg c
Exhaust headers near head  110 deg  c
 Tyres ....  Metz  Z6   24 deg c...
So generally way cooler than the Breva. 
Nigel
Keep smiling , it makes people wonder what you've been up to!
'04 Breva 750, '99 Bmw R1100S, '06 Triumph Bonneville '05 CBF 250, '03Bullet 65 500, '93 MZ301 Saxon fun
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bugsy Quote  Post ReplyReply Direct Link To This Post Posted: 22 Oct 2018 at 20:54
Makes sense of the Breva bevel oil requirement 85W 140 I suppose.
Ron

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