SB Products Billet SuperJet engine case

[QuickMick]

i had already planned on doing a billet front cover, i like the idea better about putting the o ring groove in the cover instead. I know which guys get the first three for a deal.

Great idea.

Brian

me me me

 

[restosud]

tough call as reliability is a factor also.
the gp cranks are so beefy compared to the 61x.

 

[Idok]

one thing about those stroker cranks the more stroke the bigger the angle on the webs which will cause quicker/greater wear on the top end

it SEEMS to me that you'd go thru pistons at a quicker rate with the dasa setup as compared to the WDK...

 

[750SX]

one thing about those stroker cranks the more stroke the bigger the angle on the webs which will cause quicker/greater wear on the top end

it SEEMS to me that you'd go thru pistons at a quicker rate with the dasa setup as compared to the WDK...

all that depends on the length of the rod. As smart as these guys are I'm sure they have accounted for that, and use longer rods.

 

[teton]

I think it would be cool to o-ring the intake and use a double o-ring instead of a base gasket......it would make it sooo much easier to work on....

also I always thought it would be convenient to put a drain-plug in the bottom of the cases......

man those cases are nice.....

 

[wsuwrhr]

all that depends on the length of the rod. As smart as these guys are I'm sure they have accounted for that, and use longer rods.

Had some things come up today so I wasn't able to stay on top of the thread and be able to reply to everyone's questions.

Thanks for the vote of confidence. I do appreciate it.

We am running a 144 rod, just over 1.7 rod ratio, still pretty good for acceleration but not to where we are killing pistons.

Brian

 

[steveyz250fpilot]

me me me

and me and me and me!

 

[wsuwrhr]

tough call as reliability is a factor also.
the gp cranks are so beefy compared to the 61x.

Any crank will disintegrate if you don't take care of it. Absolutely.

Bigger bearing=more strength of course, but at a price, bigger bearings rob more power.

bigger bearings/bigger journals=more mass

More mass=more robbed power

Many parameters become a balance point. When designing an engine you have to weigh at what point do you need more strength and at what cost.

We talked about these factors when I started designing the case. Essentially designing the engine around the crankshaft, since it was more or less the only unknown of the combination. Dan didn't feel that bigger bearings were needed, SJ bearings are already pretty big to begin with.

Dan has never, ever, experienced a bearing failure related to power issues, failures from pistons pistons coming apart, lack of oil, lack of maintainance, whatever.

This engine has served the test of time.

When I built the billet Banshee case, we went with bigger bearings because of this very issue, the factory bearings are pretty small to begin with.

I hope this helps.

Brian

 

[wsuwrhr]

I very well may o-ring the intake and I did some preliminary development on the billet front cover, so you guys can expect to see that within a couple weeks.

The problem with a double o-ring between the cylinders is the amount of space it would take up. I would like to do it, but there isn't a lot of room to work with.

Drain plug? You are talking about in the mag area right? If you are, I could do that, but I think in the cover would be alot more accessable.

Thanks for the compliment, I spent alot of time on them(and still not done really) trying to make them look nice.

Brian

I think it would be cool to o-ring the intake and use a double o-ring instead of a base gasket......it would make it sooo much easier to work on....

also I always thought it would be convenient to put a drain-plug in the bottom of the cases......

man those cases are nice.....

 

[wsuwrhr]

I am interested in how the case girdle kit is set up.... are all of them... not sure how that would work...

Sorry about the confusion, I probably should have used a different term. I hope my posts explained it enough.

Brian

 

[wsuwrhr]

Are you able to see them now?

For some reason I cant see the pictures...Is anyone else having issues? I would love to see these.

 

[750SX]

All these guys voting for the oring base surface. Don't you ever play with your squish?

 

[wsuwrhr]

All these guys voting for the oring base surface. Don't you ever play with your squish?

I am pretty sure it won't be feasable to o-ring the deck surface anyway.

Brian

 

[restosud]

squish can be modded with base gasket or cylinder deck.does not preclude oringing in any way .

 

[snowxr]

An o-ring for a base gasket is asking for trouble imo. Keep it simple. Use what is availabe at your local yam dealer for easy rebuilds.

 

[dbrutherford]

WOW BRIAN! I am seriousluy impressed.

All Kawie 650/750/800/900/1100's I have worked on had an o-ring front cover. A lot of times the oring would grow and give me grief trying to get it to fit into the groove. I usually just put them in the frerezer and silacone them into place.

As far as base gaskets/o-rings go, PJS had an engine that had seperate cylinders and o-ring base gaskets. I will try and find the pic. It is on PWCT under Wetracer's 785 X2 build thread.

I think you almost need to make a set of billet bed plates and front cover. You can't go all out like this and not have a set!

Speaking of bed plates, you might want to look into making some so that you could mount this engine in a Kawasaki 650/750/800. I would buy a set for sure!

Any update on the billet Kawasaki cylinder? Heck with a full billet engine, I may just have to start saving up... or rob my retirement account...

 

[slickchaos]

wow.. awesome pics..

congrats and good luck.. nice to see innovative things going on !

 

[Don 79 TA]

WOW.....
and i am in the market for some new stuff....
this makes the list
I have the lmaey cyl already.... now i can get a killer size crank.....
hmmmmm

 

[DangerBoy]

Done then, I will put an oring for the mag cover seal

I"m sure you already thought of this , but be sure to add material to the cover thickness to make up for the space where the gasket used to be, so people dont have starter bendix issues, and if there is space, use 090 oring as opposed to the 060 spaghetti
Db

 

[Flash-FX]

Are you able to see them now?

That's one awesome project! Hope testing and performance works out as expected. Killer work!


When is the multi-cyl model coming out for those couch riders?..... JK.