Crankshaft design/strength question

It looks robust enough, with the large diameter carried through the gear.  I suppose there's only one way to find out for sure!  At least you know which main bearing to really watch.  I might suggest you ensure that the oil feed system to that bearing is looking good...no pinch spots that might limit oil flow.  That bearing's gonna need all the help you can give it!

Edited by Bill Hahn Jr. - 22 October 2009 at 12:16pm

Alright, thanks Bill!

I was concerned about deflection or about that bearing being out of parallel with the shaft at the worst case scenario, more clearance sounds like a good plan...

The good news is this motor seems to hold up to turbocharging, at the 110HP level anyhow, I received some info from a guy who tubocharged one of these motors and kept the RPM level below 10.5K, and it worked well in both street conditions and drag racing.

 

Do you still use the counterbalance shaft? If crank deflection proves to be an issue, then would it be feasible to machine the gear off  to accept a roller bearing?  Obviously you'd have to severely mod the cases to suit.  Good luck with your project.

 wasn't sure if I was crazy for contemplating some major reengineering of this motor, but since parts of the design are very good, I'll just have to patch those parts that are not! ;)

Edited by Bob Brooks - 21 October 2009 at 4:21pm

Jay, do you sell main bearing studs and cylinder studs for an EX500?

Yikes!!

How quick/fast is it??

I would guess 250-300 HP total?

 

Originally posted by RZ350 Jay, do you sell main bearing studs and cylinder studs for an EX500?   If not, is there a listing of stud lengths of existing products, so that I might be able to use something not specifically made for this application?

I used to make them for the Ninja 1000, and a lot of the EX500 stuff is half of that motor. I will see what the lengths of those were.

i know what use a half of a z1 engine parts are cheap and the tranny would be super strog and the weight not such a prob with land speed being the outcome-wonder if you could get a norton crank to fit a 500 ninja-just think of the crank and having an end support  most cranks with the drive outboard of the end are unsupported its why we use outboard bearing supports for the same reason-think some people build the 500 to 750 the gs500 twin truely looks older but more rugged i think you could build a very big engine out of one of them the old 4 valve yamaha 500 twin is quite interesting also not sure how big a 450 honda could be-but its a big rugged lump-sherwood