SOHC.co.uk Forums > CB350/400
Oil coolers
Scottish Badger:
--- Quote from: Oddjob on December 07, 2022, 12:51:23 PM ---Don't know why you think you need an oil cooler in Scotland, the sun never comes out ;D ;D ;D ;D ;D ;D ;D
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Ooh, cheeky! :)
Scottish Badger:
--- Quote from: McCabe-Thiele (Ted) on December 07, 2022, 03:17:08 PM ---It's contingency planning for if Ms Sturgeon gets her way.
He might need to flit to England.
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Hmm... She's all bluster, she knows it'll never happen. All she does is make noises to keep her followers on-side, so she stays in power without actually delivering anything of substance! I think my title deeds are safe enough for the time being, haha.
McCabe-Thiele (Ted):
FWIW if we had a referendum like Br***t to decide if Scotland should be kicked out of the UK it might be a surprise result - I'm sick to death of her bleating and would vote accordingly. :-\ :-\
Johnny4428:
We are all sick of it Ted! She can shove her independence right up where the sun don’t shine.🤣
K2-K6:
--- Quote from: Scottish Badger on December 07, 2022, 10:35:27 AM ---
--- Quote from: K2-K6 on December 07, 2022, 10:18:28 AM ---Yes to that type of arrangement, but in agreement with you as to how effective it may be in cooling, I was referring to method of fixing as interesting point. The fit for F2 was this plus larger fins on head and barrels as complete package when they ran into trouble with lubrication on that model and kind of stop gap until the twin cam arrived in market.
Wondering the need for cooling as running oil too cold produces just as many problems as too hot. If you've no definite figures of your running example it may be worthwhile assessment to define this.
Running oil too cold, and especially at high rpm can bring unintended side effects. The pump is protected from hydraulic locking (virtually all engine have this) by a pressure bleed off valve that blows excess to sump effectively startng to starve key points in the lubrication system of supply, that's ordinarily the crank and big end bearing sites.
The flow is optimised for stated viscosity (varying with temp) at 90 degree C to give designed flow as originally tested and researched. You'd need to target this temp range in specifying cooling capacity.
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I'm going to build a 460 engine for my bike, I have a spare 400 engine as a donor for the project and I now have most of the parts needed for the build, but I've read a lot of older posts claiming oil temp gets marginal with the larger bore size hence the need for additional cooling. I was looking to use an in-line oilstat to regulate the temp, being aware of the pitfalls of overcooling. (I'm an aircraft engineer by trade, spent decades working with both piston and gas turbine engines).
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Interesting background in this field. You must have seen some good installation of this type on other systems. Is there anything fundamentally different to this available (sandwich plate type) as this, well definitely a seperate thermostat always looks quite cumbersome on such a small engine.
Always unsure of historic views on additional oil cooling, only from the point of view that the users don't often seem aware of why they've fitted one, more a kind of just because that's what everyone says status.
I like running temperature gauge to see what is really happening in very high duty use as it may not even get into that realm anyway.
Interested to see your solution as I've been looking through combined sandwich plates with built in thermostat, but don't look like you could fit an original type filter housing but just a cartridge type to it.
That 400 always seems like an ideal notional 500 motor when modified and closer to that era grand prix motor than the cb500 having shorter stroke. Certainly an interesting project.
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