Honda CB750 Sandcast
The Restoration Shop => Engine Mechanical => Topic started by: Joe K on February 22, 2010, 11:48:49 pm
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Is is possible to combine the top of a sandcast case to the bottom of a diecast case? Is there a special 10 bolt pattern for the sandcast case only preventing the two types of engine cases to be put together?
Thanks for your responses in advance,
Joe
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dont risk it i would say definetly not the cases must be of a matching pair meaning original top too original bottom,or you will have messed up all the main bearing oil clearances, a friend of mine done it years ago with two mismatched diecast cases and trashed the engine it was knocking its guts out as soon as he fired it up you have been warned lol
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Thank you for the heads up. I don't think I will attempt it after all.
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Remember that the SC cases have 9 bolts for the clutch cover and the die cast have 10.
peace and grease,
-fang
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I would suggest this to be an absolute NO-NO! The cases are machined as a matched pair meaning, exactly as Steff750 said, that the main bearing housings WILL be mismatched / mis -aligned.
Out of interest though, the only difference between 9 hole and ten hole clutch covers is the extra hole. A ten hole clutch cover WILL fasten directly on to a sandcast crankcase set, except of course you have an extra hole that you can't put ascrew through. With careful modification and a tiny bit of welding, a 10 hole cover can be coverted to look like a 9 hole cover, if necessary. Its all good fun!
Chris R.
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I am wondering if we are talking about THIS (dead link) item which recently sold on eBay?
-fang
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Yes, fang. That is why I brought the question up. I was interested until I found out I could't put on a die cast cast on the sandscast top. I figured it would be too difficult to locate a sandcast bottom.