SOHC.co.uk Forums > CB350/400
Oil coolers
Scottish Badger:
--- Quote from: Johnny4428 on December 08, 2022, 11:27:53 AM ---We are all sick of it Ted! She can shove her independence right up where the sun don’t shine.🤣
--- End quote ---
Hoorah to that!
Scottish Badger:
K2-K6
My theory is this - assuming older info I've read from tuners in magazine articles is correct in stating there was no need to up the oil pressure in any way, but temps became marginal with the original Yoshi big bore kits.
Whilst a bypass sandwich plate with integral thermostat would be preferrable, no such item exists for this engine. I don't want to over-cool things (just as bad if not worse in some cases than too high a temp or a low pressure!), so an external 'stat is the only alternative. I've found a 'stat to go with, which I think will sit to the nearside of the filter head without appearing too cumbersome. It starts to open at 72c which may sound a little low but it's going to be in airflow so the oil temp will probably need to go a bit higher before any real flow takes place through the cooler. The oil is also being returned into a hot crankcase and pumped up a hot cylinder barrel to a hot head, so I doubt it'll be over-cooled in all honesty.
I've ordered up an offcut of aluminium bar 4" diameter which I intend to chuck up in the lathe and make my own sandwich plate offtake, so I can put the oil ports exactly where I want to suit the thermostat install.
None of this is going to happen overnight, it's a slow-time project, but as and when I do anything I'll take pictures. I do, however, need that longer CB650 Nighthawk filter bolt.....
This is the 'stat I'm looking at using, the body is 88x49x32, the fittings are AN10xM20 but I can play with different fittings to get the positioning / hose angles as neat as possible.
taysidedragon:
--- Quote from: Johnny4428 on December 08, 2022, 11:27:53 AM ---We are all sick of it Ted! She can shove her independence right up where the sun don’t shine.🤣
--- End quote ---
Agreed!🏴
K2-K6:
Have you seen the plates like this one that incorporate thermostat neatly integrated
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From this link https://www.advocultmotorsport.co.uk/mocal-thermostatic-oil-sandwich-plate-high-flow/ that may, with a bespoke spigot, take a honda filter housing and std bolt arrangement.
Or use a later type cartridge filter used on Honda bikes early 80s.
Scottish Badger:
I did look at that type, but the only ones I found were either too bulky or the sealing ring diameter was way too small to seal against the crankcase.
I didn't see that particular one however, and I could certainly chuck it up in the lathe and machine a larger diameter o-ring groove, but it says suitable for up to 80mm cartridge filter sealing face and the Honda seal is 89x4.4 (from memory!) so i doubt there would be sufficient metal there either.....
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