SOHC.co.uk Forums > CB750
Interesting Article
AshimotoK0:
Well here's the man himself with all of his BS.
https://www.youtube.com/watch?v=gA3FFe-lSsw
Similar video on the Z1 as Andrew said.
Much better to listen to Trigger as he has actually restored loads of those engines including fixing chain damaged casings.
Here is what steve Swan founder of Sandcastonly forum commented.
Steve Swan
9 months ago
This expert is obviously misinformed and possibly delusional. The first 7,414 1969 CB750 Honda engines were DEFINITELY produced using the Sandcast process. They were diecast beginning at CB750E-1007415. Sandcast and "gravity cast" are for all PRACTICAL definition, the same thing. Diecast or permanent mold tooling is not cheap and Honda had no idea if sales of their new bike would justify the investment in the tooling. It is quite common for manufacturers to build prototype and pilot series runs using the Sandcast process because it is much cheaper. The intro on this forum, http://www.sohc4.net/cb750-sandcast/, about the Sandcast motors is chock full of incorrect information. The writer obviously knows little about which he speaketh and writeth. Your Sandcast engine cases saw quite a bit of sand.
Moorey:
The man obviously knows nothing about metal casting and the costs involved in producing a single set of dies back then. A simple pair of blow moulding dies for blowing plastic bottles can cost up to £50,000 and can be very easily ruined.
Nurse Julie:
He's a writer by trade so can tell and sell a good yarn.
royhall:
Don't forget that these things are not Sandcast like an early Meriden triumph, they are gravity die cast, a vastly different method. Or is the information freely available out there also bullshit.
UK Pete:
sandcast casing
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