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25 Jul 2003
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cylinder head temperature- R80/R100 twins
what is the "normal" working temperature for the cylinder head on the old airhead twins ?
i appreciate this will vary with the ambient temperature of the surrounding air,
any ideas ?
thanks
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25 Sep 2008
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A very good question!
And not even one reply since 2003 ?!
Has anyone used IR-heatgun(?) and measured the heads temp ?
The original question has no answer since BMW have not published any data on head temps.
References to VW heads ?
What optional coolings of the heads have you tested ?
CC-Racing or was it Luftmeister made valve-covers with o-ring sealing instead of the gasket => enhancing cooling of the heads they claimed (no temp data was published - was it only a sales gimmick?...). There is an R90W in EU - neat build! Still - what head temps could be considered normal ?
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Last edited by dc lindberg; 29 Mar 2009 at 10:41.
Reason: watercooled links
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29 Mar 2009
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11 Apr 2009
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Quote:
Originally Posted by bryan
what is the "normal" working temperature for the cylinder head on the old airhead twins?
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What do you mean by "normal working"? Run two up loaded with gear and it'll be higher.
In general, I would guess somewhere around 350°F to 375°F with a maximum at 425°F. These numbers based on aircooled aircraft engines.
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9 May 2009
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Took theses today after a hours ride, 1992 R100GSPD stock setup with plugged air injection system.
Cylinder head temp is around 300 degrees
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9 May 2009
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Quote:
Originally Posted by tatters
Took theses today after a hours ride, 1992 R100GSPD stock setup with plugged air injection system.
Cylinder head temp is around 300 degrees.
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So that was taken when you were parked and not under load at 60 MPH.
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9 May 2009
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Theres not going to be much temp diffrence from riding under load around london to stopping straight way and taking a couple of shots from a hand held imager.
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9 May 2009
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Quote:
Originally Posted by tatters
Theres not going to be much temp diffrence from riding under load around london to stopping straight way and taking a couple of shots from a hand held imager.
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Well temperatures drop off quickly at first...sort of like a discharging capacitor.
It would be interesting to see what the cylinder head temperatures would be at a steady cruise of 60 MPH or higher.
I remember the cylinder head temperatures in an air cooled aircraft engine.
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10 May 2009
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Tatters,
Your pics were most interesting.
They have settled one issue - an indication on how hot the cylinders and heads may be at stop-lights and in city-jam.
Alex's point on how hot the heads may be at normal cruising speed is also interesting - far more tricky to get photos of though -
Could this be a gadget that may be a useful aid to get pics in speed?
Panavise Test
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