Bolts 101, fixin broken ones and other shop mayhem

[bob58o]

Comet never made a backplate for the 40 series. Only aftermarket. It wasn’t originally meant to be used like that. Plates, reverse springs, alignment issues… toss em in the bin. I think with the reverse spring, you still want the driven to float on the Jackshaft to allow self alignment during the shift. I remember the convo with sid but don’t remember how the driver unit was installed on this engine.

 

[bob58o]

What is preferred orientation with 40 series and backplate with which spring? I believe the last photo shows the original comet set up. Both movable sheaves move same direction.

 

[Master Hack]

I've looked at putting a jackshaft in there, but there is no way. Just no room. I'm stuck with the plate, which works fine. We've covered a lot of good stuff, but how to fix this malfunction, using what l have. The plate is 3/16 steel, so it's plenty heavy duty. I just need to hold it still. There might be a little extra power going through this thing, and there is a lot of weight to haul around.

 

[Master Hack]

OK, Please elaborate on the floating driven thing. So yer sayin the driven is loose on the shaft, so it can move side to side by 7/8 inch?

 

[bob58o]

OK, Please elaborate on the floating driven thing. So yer sayin the driven is loose on the shaft, so it can move side to side by 7/8 inch?

I’d only worry about it if belt alignment is an issue. most people don’t float the driven.

My brain don’t work so good. I forget a lot of what I used to know.

Alignment when disengaged means unaligned when shifted (depending on orientation inboard / outboard or each unit.). A floating driven unit (sliding along the jackshaft) allows the sheaves to stay aligned from unengaged throughout the shift. Comet instructions state DriveR unit must not float, but doesn’t mention driven unit. In my head, they were always thinking about allowing the driven to float.

Enjoy these useless scribbles trying to show belt angle before and after shifting.

 

[Functional Artist]

Hey T,

Wish I could help
...but, this issue is kinda out of my ballpark

I can tell ya that Sid "knew his stuff"

 

[bob58o]

If you look into snow mobiles…. Lots of discussion about floating secondary clutches. I guess it’s been a hop topic . I guess it boils down to wear on the belt vs wear on the shaft. Belt angle may be important to your side cover mount issue tho.?

“The floating secondary was a thing that tryed back in 73 when all the racers were blowing belts . This cured the problem skidoo used a floating secondary for 25 years them some young engener got a brain wave that he knew more than the old guys and floating the secondary was no good . Now we are back to a lot of belt dust and belt ware the belts are better than the ones we had in 1973 so blowen belts are not near as bad today. Duck 's kit fixes this problem .”

 

[Master Hack]

Doesn't look like l'll be floating anything 'sept maybe a few ice cubes....

ain't this purdy?
l took the bearings out cuz l gotta modify 'em!

 

[Master Hack]

So, does this look right?

 

[bob58o]

Looks good to me. I think floating the secondary is most beneficial when using the yellow (reverse wound) spring and the movable sheaves on each clutch move in opposite directions. As long as one clutch is inboard and one outboard, the alignment during/after the shift shouldn’t be as much of an issue.

 

[Master Hack]

Today on Egor's workshop wees gunna shift gears a little. The CVT remodel and refit will be put on hold while we change the subject to,
What the f%@(*&^!#% happened here and just how good are those chinese replacement engine blocks?




Egor is not happy. He may be hungover tomorrow....

 

[bob58o]

Oh no. I see 390 blocks for $70. Not sure if Japanese or Chinese.
I do love the look of those fancy welded blocks.

 

[Denny]

Time to break out the tig welder!

 

[Master Hack]

Time to break out the tig welder

Zackly dat is gunna bees happinin real soon. Gots nutin to loose.

 

[Master Hack]

Egor saw that welded block and decided to do the same thing.
he's been practicing his TIG welding a lot. Says he's got this.

 

[bob58o]

Got to be an expensive piece of stock to make billet blocks. But they sure look fast.

 

[Master Hack]

Yeah, that ain't happinin....

 

[Master Hack]

I tasked Egor and the Ghetto fab division with designing an engine/CVT mount that meet the above stated design critera. This is a mockup of the design.
What's another 30 Lbs?
Thi$ $tuff i$ difficult! I want my mommy! Uhhh, no wait.....

 

[Master Hack]

Egor spent the morning in engineering, production meetings and quality meetings, getting approval to start the building the latest engine/CVT mount system. Then spent the afternoon building it.
This will be revision 693C, incorperated into this production model.

 

[Master Hack]

New Honda block is on the way to the Mt. Top, courtesy of NR Racing, Visa And Fedex. Stay tuned for more mistakes, malfunctions and Mayhem.

Hmmmm, Mistakes, Malfunctions and Mayhem, 3M. I believe l'll start a new division.