My Cool 750 Commando

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I run my oil cooler all year round and have done so for 39 years, its not thermo controled as soon as the oil comes out of the motor then straight up to the cooler before going back to the oil tank and my Norton has never missed a beat, it has done a lot of miles well over 140,000 miles and has only been rebored once, my breather goes straight from motor to a catch bottle and never back to the oil tank and one of the reasons why my Norton has given me good servise is because of the way its set up, keeping the oil cool and clean, it never uses oil between oil changes (ever 2,500 miles), its never had any major oil leaks, yes they do seep around some covers that is easyly fixed.

When I first brought my Norton new it did run hot in traffic but as soon as I put the cooler on fixed that straight away it made a big diffrents, I also run a cooler on all my bikes I have owned over time 2 old Triumphs, BMW and my new Triumph has a very big oil cooler.

Ashley
 
I am guessing that you think the olden days is 2015. to try to cool an auto transmission on an air-liqued cooler is not practical because of the physical size it needs to be. every vehicle made in the US uses an in radiator exchanger as liquid to liquid is a much more efficient method. some of the heavy duty pickup trucks have gone to an outside liquid-liquid exchanger as it can be bigger along with an air cooler before it as they want the trans fluid to run in the 200F range. this way if the trans is to cold IE in sub zero temps it is in a better operating temp range. you can also run engine oil to cool where it cannot cook off the combustion byproducts, this was also one of the reasons for oil's to sludge up as it never reached an optimum operating temp. I would guess you want your automobile to run @ 160f or remove the thermostat so it will run colder yet. a warmer engine is cleaner, more efficient and better on oil life.

needing said:
To me, not running an oil cooler would be akin to suggesting I run my cars auto trans fluid through the bottom tank of my radiator cos that is how they did it in the olden days
Hope this helps.
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good luck on this one. I don't think with even a 2 in 1 would work as the pluses are to far apart to make an effective vacuum.

needing said:
Yep. Already planning exhaust vacuum. Have got the parts and plan to do so when I get back from tha national rally. Reference to explosiveness was to negate any naysayers at the kneecaps. TS is irrelevant - read Combat engine.
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I guess that you don't understand that you can run oil or the engine to cool. you are the one that brought up the auto trans cooler example and I just expanded on it.

needing said:
Yep Bill.
You're right. Completely off topic and nought to do with my Norton.
Oil cooler on my bike is good!
Subzero is beyond my experience - good luck with that!
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needing said:
Hi Ashley.
My reality is similar to yours.
First thing I fitted to my bike in 81 was the cooler.
The thermostat went on in early 2013 (fits unseen above the filter).
Just a guess but i reckon overall that more more Nortons worldwide have been cooked without a cooler than with one - especially in hot weather stop/start. A feature of the Pilbara in not a lot of traffic lights.
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:lol: :lol: :lol: you been here 3 days and .................


My Cool 750 Commando


:lol: :lol: :lol: :lol: ... Change, outside of the box!! :D
 
Doesn't make his opinion less valid. He just hasn't found what I've found. Interesting reading nonetheless.
 
Welcome to the forum. Nice bike ! I use a reed valve attached to the breather on my 73 750 and run the exit pipe back to the oil tank. Works great.
 
@Needling

When pistons are in descent,what keeps crankcase gas from blowing back up the pushrod
tunnels and out the air inlet in the inlet rocker box? Do you have a second reed valve at the rocker box allowing air in, but not out?

Have you made any crankcase pressure measurements, at idle and high (>3000 rpm)?

Slick
 
hobot said:
Gas pressure pluses can't pulse up pushrod tunnels to matter as pressurized oil is being forced out the small lifter groves
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Are you talking about the grooves in cam followers?
The oil running down the push rod tunnels is not under pressure it is just running back to sump under force of gravity as is oil from rear drain hole.
Therefore if blow up from pistons or valve guides if bad enough could have an effect on it or feed past it in which ever direction depending on where high an lower pressure areas are.
 
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