Triumphrat

Motley

No it's not what you think.

I was sitting in the garage having a smoke and admiring the Thruxton, as usual, when a thought occurred to me.

What way does the oil flow through the oil cooler? Does the oil enter the oil cooler from the top and is gravity fed back to the crankcase? Is the oil pumped from the crankcase up through the oil cooler?

Surely that small oil line behind the jugs, from the crankcase to the head (the one with the pressure sensor) can't be supplying all the oil the head needs? If it does, how come there are two large hoses seemingly emptying the head. What way does the oil flow through the smaller tube/hose anyway? Is there a significant amount of oil carried to the head by the cam chain?

Got any answers folks? Inquiring minds need to know, seeing as how I'm too feckin' lazy to consult the Haynes manual.

[ This message was edited by: Motley on 2007-04-15 12:38 ]

CAPTDON

Same question crossed my mind? :???:

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CAPT D

Motley

Judging from the heated debate............I don't think anyone really knows.

merlin

There are two oil pumps on the bonnie, not redundant - one pushes it through the cooler - that's all I know, except there's alot of passages and routes and twists and turns and ups and downs. I doubt gravity plays much of a required role.

Motley

Thanks Merlin, it seems we know so little of this. In the interests of mankind I think I'm gonna have to bring the Haynes manual into the crapper.................for a good long read.

[ This message was edited by: Motley on 2007-04-15 20:13 ]

thumper723

From the oil flow diagram in ye-old trumpet service manual I have here...

The small pipe on the back, provides oil to the cam bearings, cam lobes, valves and cam gears. It returns to the sump via gravity, by falling down the cam chain cavity (lubes cam chain in the process)

Oil Pumps supply the following:

Front Pump:
Circulates oil along passages in the barrels then travels up to the head and flows through ports around the cumbustion chamber and exhaust ports. Then flows via the pipes to the top of the cooler, and returns to the sump. So the oil flows from top to bottom.

Lubes input shaft in transmission, and its gears and bearings.

Front pump oil is not filtered, except for an intake strainer.

Rear Pump:
Sucks oil from sump, pumps through filter and delivers pressurized, filtered oil to the cylinder head, crank and rod bearings.

A short pipe feeds the output shaft (countershaft) and its bearings.

Edited for spelling.

[ This message was edited by: thumper723 on 2007-04-15 22:33 ]

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Motley

Excellent! Thanks Thumper. The Haynes manual doesn't give any information like that. It's good stuff to know. Maybe I ought to get the Triumph manual to supplement the Haynes and vice versa.

Thanks again.