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Old 08-17-2012, 02:18 PM   #1
Sniper X OP
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Airhead oil temp?

So I fixed my (aftermarket0 oil temp gauge. Wonder what I should be seeing on it. Have only ridden on cool damp evenings so far after fixing it so have only seen between 180f max.....and that was when it was a warm night.
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Old 08-17-2012, 02:55 PM   #2
naginalf
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I'm very interested in this as well. My meat thermometer dipstick has a red dot at 120°C (248°F) and it regularly gets there or more on a hot day at a stop light. Is this bad?
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Old 08-17-2012, 05:36 PM   #3
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Oil temp readings vary a lot depending on where the readings are from. Dip stick oil temp readings are largely reading the air temp inside the engine. Combustion gases are hot! Those rings don't seal perfectly!

220 to 260F should be the goal according to most I have read. I know from experience that if the temps don't get high enough a lot of crap never gets cooked out and the oil gets dirty real fast.

I forgot to add that I have no idea what oil temps my bikes run. I don't care. My oil temp has never been too hot. At least I have never seen any evidence of it and I run the piss out of my bikes.

supershaft screwed with this post 08-17-2012 at 10:30 PM
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Old 08-17-2012, 07:25 PM   #4
ignatz72
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Yep, from what I've experienced with air-cooled motors, around 250 is an upper limit on a 100 degree day.
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Old 08-18-2012, 06:45 AM   #5
pthomas
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Oil should be above water boiling point for 45 mins; the heat boils off water (condensation from the prior ride) that normally mixes with other stuff and becomes an acid that corrodes and eats up the engine. 280F is viewed as an upper temp limit.
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Old 08-18-2012, 03:04 PM   #6
Max Headroom
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FWIW, I've had a oil temp dipstick on my R90S for six years, and have taken an interest in the readings under differing riding/weather conditions. One observation is that the weather has a minimal influence on oil temp. Instead the riding pace and road type does.

Generally the oil temp hovers around 120C (250F) in typical riding conditions. At a track day a few years ago the oil temp got to 145C (295F). On a gentle highway ride in winter, the temp sits at 110C (230F).

I don't rely on the specific readings at all, I just watch for consistency in case the trend changes. When combined with a oil pressure gauge, it gives me a picture of the engine's health.

YMMV etc
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Old 08-23-2012, 07:35 AM   #7
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The oil temp pick up on my bike is in the drain plug. It only has seen a max or about 210f on rides that last about an hour. And none of these rides were heard rides to any extent.
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Old 08-23-2012, 08:16 AM   #8
R100RT Mark
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Sniper X, please share the manufacturer/brand/part numbers of your oil plug temperature sender/gauge set up. Seems like an interesting farkle.
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Old 08-23-2012, 08:47 AM   #9
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Originally Posted by R100RT Mark View Post
Sniper X, please share the manufacturer/brand/part numbers of your oil plug temperature sender/gauge set up. Seems like an interesting farkle.
I know the gauge is a VDO, but unsure where the guy got the oil drain plug sender unit. I'll take pics of both tonight....
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Old 08-23-2012, 10:09 AM   #10
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In Germany you can buy an airhead oil temperature stick maufactured by RR. They come in 2 different length, 275mm and 285mm, depending on your airhead. The stick are sold by Hein Gericke, Polo, but also Touratech and Wunderlich if memory serves me right. It is in C however.... 100 degree's celcius is 212 F, my RS unually operates around that temperature, unless I am on the interstate, run around at 80 mph, for over an hour or so, or if it is 100 degree's F outside. It does have a red mark at 120 degree's celcius. A nice farkle, if I must say so myself....100% accurate, as I stuck it into boiling water before using it.... and yes they are still available today... measure your current stick (from the bottom to the threads) and order it. Let me know if you got trouble I can look the info up....
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Old 08-23-2012, 10:11 AM   #11
R100RT Mark
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Quote:
Originally Posted by Sniper X View Post
I know the gauge is a VDO, but unsure where the guy got the oil drain plug sender unit. I'll take pics of both tonight....
Can imagine creating a plug with a central tapped hole to accept a temperature sender. Would be nice to think such a part might be available as an aftermarket item; but that might be asking too much. Look forward to the pictures.
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Old 08-23-2012, 10:18 AM   #12
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http://www.louis.de/index.php?topic=...034127&lang=en

website for such an animal if anybody is interested....
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Old 08-23-2012, 10:27 AM   #13
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Originally Posted by boxerkuh View Post
http://www.louis.de/index.php?topic=...034127&lang=en

website for such an animal if anybody is interested....
Mine is actually a real VDO Oil temp Gauge, that is fitted in the stock gauge hole in the dash that WAS fitted with a volt gauge. I have the voltage gauge still but the OTG is there, and the sender is in the hole where the drain plug was.....
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Old 08-23-2012, 11:13 AM   #14
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Quote:
Originally Posted by R100RT Mark View Post
Can imagine creating a plug with a central tapped hole to accept a temperature sender. Would be nice to think such a part might be available as an aftermarket item; but that might be asking too much. Look forward to the pictures.
I got an Acewell speedo/tach that has a temp. readout. Got a temp. sending unit with it, http://www.acewell.co.uk/Acewell%20A...ion=full&id=34. There are other sizes available, http://www.acewell.co.uk/Acewell%20A...sors/index.htm. I have an oil dip stick temp. gauge, but no longer use it.
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Old 08-23-2012, 12:16 PM   #15
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OK, I think I have sorted out the engine oil drain plug oil temperature sender/oil temperature gauge “opportunity”.

The oil drain plug is M18 x 1.5. VDO oil temperature sender part no. 323-064 should be a direct replacement fit and would match to VDO oil temperature gauge 310-012. The latter is a standard automotive 52mm (2 1/16”) dia. gauge. See images below. There are probably other options, this was just my first pass.

Anyone have any concerns about using the sender as the drain plug?


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