Author Topic: Not much happening here (Read 3035 times)

Sam Green Racing · « **on:** May 28, 2019, 03:30:26 am »

so this should get people talking, hahaha.

Sam Green Racing · « **Reply #1 on:** May 28, 2019, 03:42:57 am »

And from the other side.

MRieck · « **Reply #2 on:** May 28, 2019, 04:14:32 am »

No billet head or cylinder?

sohc boy · « **Reply #3 on:** May 28, 2019, 04:25:14 am »

hoo wee , never seen one of those before

madmtnmotors · « **Reply #4 on:** May 28, 2019, 04:35:48 am »

Now it's your turn to start talking Sam! WTH is that and where do I get one?

slikwilli420 · « **Reply #5 on:** May 28, 2019, 07:31:27 am »

I spotted this on facebook. A ton of hand work into making the cases that way. So many details if you know what the stocker looks like. The only thing I don't care for is the exposed ignition. Opportunity to do a cool vented cover or something that would still offer protection. I do like the little plug on the other end of the crank though. When you want to go extreme on weight savings and be one off, this is a nice way to go.

754 · « **Reply #6 on:** May 28, 2019, 07:46:31 am »

No front motor mounts ?

Sam Green Racing · « **Reply #7 on:** May 28, 2019, 08:07:04 am »

He's using the motor as a stressed member of the frame Frank and the frame will also carry the oil.
I'm not sure if he's not got round to the top mount yet but you can't see it in the pictures.
He says the crankcases are stock CB750 but the crank end cover looks a bit special and it isn't like the CR750 cover.
I'll post more as I find out.

Sam.

turboguzzi · « **Reply #8 on:** May 28, 2019, 08:48:33 am »

to me it looks like fully CNC machined cases.
just looking at relief areas under the top rear mount ball, it's nothing like stock cases.
"Stock" maybe in general look, not much else

livefast_dieold · « **Reply #9 on:** May 28, 2019, 09:12:02 am »

Quote from: turboguzzi on May 28, 2019, 08:48:33 am

to me it looks like fully CNC machined cases.
just looking at relief areas under the top rear mount ball, it's nothing like stock cases.
"Stock" maybe in general look, not much else

looks like heavily modified stock cases to me, if I understood correctly what you mean, those relief areas are there also in the stock cases. You can also spot the welds used to block the passage from the cases to the alternator cover.

Would like to know more, is it for drag racing? Otherwise, without the front mounts, there is nothing much to bolt the motor to on the valve cover

754 · « **Reply #10 on:** May 28, 2019, 10:28:20 am »

The crank end cover was used like that in the early 70s on the Rocky Cycle 750 flat track bike.
The front cover under the cylinders, must be added if its not new cases, but I am betting, that brought in some war page to the cylinder base, and possibly the case half joint. . Resurfacing cylinder base is a minor problem.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #11 on:** May 28, 2019, 10:33:55 am »

"He's using". Who is he and what is he using it for/in? Too much suspense Sammy!!!

turboguzzi · « **Reply #12 on:** May 28, 2019, 11:20:40 am »

ric, in stock, those reliefs end at the bottom like straight ribs, thats the only way to cast them. the large radius at the relief bottom can not be cast, only machined... ditto for the RSC writting in front.

livefast_dieold · « **Reply #13 on:** May 28, 2019, 02:42:17 pm »

Quote from: turboguzzi on May 28, 2019, 11:20:40 am

ric, in stock, those reliefs end at the bottom like straight ribs, thats the only way to cast them. the large radius at the relief bottom can not be cast, only machined... ditto for the RSC writting in front.

the RSC front could have been machined on the stock cases, he even left the small plug in the middle.
As for the rest it's not clear to me to what area you are referring too, as he even left some features of the stock cases that wouldn't make much sense leaving if it machined the whole thing

gschuld · « **Reply #14 on:** May 28, 2019, 03:14:35 pm »

Similar left side treatment.

George

turboguzzi · « **Reply #15 on:** May 28, 2019, 03:32:20 pm »

well, I could be wrong too...

BTW, that cb750 racer is Guy Bertin's bike, 70'-80' 250 GP rider

754 · « **Reply #16 on:** May 28, 2019, 06:43:02 pm »

That is just wrong using banjo bolts on them calipers..
Now the unfinned calipers, it's OK.

Ban the Banjo. .

Sam Green Racing · « **Reply #17 on:** May 29, 2019, 04:18:56 am »

OK guys, the person behind this project is called Garth Allison and this is his last post, copy and pasted from Facebook.

Garth Allison Sam Green sorry can't get tapatalk , but the vision behind this project is something I could build after my CX500 cafe racer that was as people said , " a cookie cutter " . So my thoughts went to CBX 1000 , and other Honda twins that use the top section of the motor as an engine mount . I will mildly modify the engine as my budget is small . I making it a track bike , hence no alternator / charging system . The cases are std ones which took hours to shape and the RSC logo is Bonded on using Devcon . The frame will be actually similar to the CX500 , but very MotoGuzzi like also , with billet side engine / swing arm plates . The substantial single back bone frame will also be the oil tank . I know people have their view on this concept , but the top mount I have worked out , the only worry I have is oil leakage / sealing around the base and head gaskets . Drew a quick drawing of want I have invisaged . This is purely a experiment in design , I may work , it my not , but hay ,want the heck 😃☹️🙏

MessnerMoto · « **Reply #18 on:** May 29, 2019, 05:06:38 am »

I support the effort. I envisioned something similar.

How you will connect frame with upper part of the engine? Modify head? CBX has 4 holes on the head for connection with the frame

Sam Green Racing · « **Reply #19 on:** May 29, 2019, 07:14:16 am »

I have given him a link to the forum in the hope he can join us and explain things for himself.
He lives in Australia but was from NZ originally.

livefast_dieold · « **Reply #20 on:** May 29, 2019, 08:25:59 am »

Found the guy and the conversation on Facebook, here's a sketch from him:

btw judging from his profile picture he can also give us good recommendations for gym workouts :-)

turboguzzi · « **Reply #21 on:** May 29, 2019, 09:00:37 am »

seen mods like this.... it has been done before in other motors, not sure about a 750 sohc.

if the load is spread overall several bolts that are widely spaced then the pure tensile stress on each is not that high.

pic is not exactly what hes doing, but you get the idea...

simon#42 · « **Reply #22 on:** May 29, 2019, 10:43:11 am »

have always thought that that is a dreadful way to mount an engine

kmb69 · « **Reply #23 on:** May 30, 2019, 07:15:43 am »

Tintop · « **Reply #24 on:** May 30, 2019, 03:34:00 pm »

Quote from: simon#42 on May 29, 2019, 10:43:11 am

have always thought that that is a dreadful way to mount an engine

Think it very much depends on if the engine was originally designed to function as a stressed part of the frame. Agree that I also doubt the 750 qualifies.

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Author Topic: Not much happening here (Read 3035 times)