SOHC.co.uk Forums > CB350/400
Oil coolers
K2-K6:
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.
Scottish Badger:
--- 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.
--- End quote ---
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).
Scottish Badger:
--- Quote from: ka-ja on December 07, 2022, 09:59:46 AM ---My sandwich plate between filter and the engine is held in place with a longer version of the holding bolt instead of an adapter spigot
--- End quote ---
That's exactly how I think the 650 Nighthawk cooler plate is attached also. I've found a complete cooler/pipes/plate package for sale on ebay but the filter retaining bolt isn't there and I can't find it for sale on its own unfortunately.
K2-K6:
F2 (for illustration purpose) filter etc for sale here and showing long bolt https://www.ebay.co.uk/itm/333956713306 that maybe a route to buying replacement if dimensions allow.
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Clipped from that item.
McCabe-Thiele (Ted):
This old post shows Allan's oil cooler.
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