277 replies to this topic

[swodem]

BSV make some bushings with a very thin flange (and internal oil galley)
Or you could fit the oillite into a drill chuck and sand them down thinner if you don't have access to a lathe
Better to adjust the car than every set of rims...


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[JK Products]

Our JK5571 oilite bushing has the little lip. Our JK5574 oilite has a flat flange (no little lip), this saves you just a little bit if you're real tight on the rear width. 

[Cap Henry]

I sold one to a customer and using Slick 7 oilites and JK Wheels you could put a spacer on each side

[Pablo]

Cap, I don't get it, either. Maybe these guys are using super wide gears and wheels ?

Or maybe they got chassis with wider uprights than ours ? Different width rules ?

 

One thing I know for sure - math doesn't lie. Here is what my digital micrometer says:

3.250 width minus:

1.318 uprights

0.250 gear

0.040 two (Slick7) bushing flanges @ .020 apiece

1.60 two .800 wide wheels

------------------------------------

0.042 remains for spacers

 

My car has VXB BB's and the flanges are .015 X 2 = .030

3.250 width minus:

1.318 uprights

0.250 gear

0.030 two (VXB) bearing flanges @ .015 apiece

1.600 two .800 wide wheels

------------------------------------

0.052 remains for spacers

[MSwiss]

I get about .033" each, on the flange of a Champion 710 , oilite.

 

A JK 8711PP measures about .813".

 

Depending on the components, things definitely get tight in the back on this, and some of the other, JK chassis.

[Pablo]

.813 ? Are we talking about rubber hanging past the rims ? Not trying to argue, but should that be part of the equation in determining chassis function ?

I'd agree it's tight, but from my end, I have two 20 thou spacers on one side, a 5 thou against the spur, and a 20 thou outboard of the spur.

I just don't see the problem these guys are posting about. I'm trying to be nice

[Zippity]

Obviously, we are not all running the same rear rubber

[Pablo]

Math is math. Those who are saying the new JK chassis uprights are too wide, please explain it to me in math terms.

If you can, I'll shut up

[Samiam]

One problem is that wheel width varies so much from brand to brand and batch to batch.

http://slotblog.net/...nt-wheel-width/

[swodem]

Math is math. Those who are saying the new JK chassis uprights are too wide, please explain it to me in math terms.
If you can, I'll shut up

Pablo

Each rim is about the width of my thumb
The Uprights are a bit more than 1.5x this (by my eye-chrometer)
The gear takes up about half a rim width
Overall, this comes to a little under the width of my four fingers



;-)


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[Pablo]

I bow down to Swiss, Sam, and Steve you got me laughing now, and between the 3 of you I'm convinced the C43 has wide *** uprights 

I stand corrected and am especially humbled by Steve's finger measurement system. I will honor my promise and shut up now.

[Zippity]

As per Post #90 earlier in this thread, below is a comparison of rear upright widths as supplied by Steve Meadows

 

C11 .025                  31.5mm

C21 .035                  31.0mm

C43 New                  33.37mm

Mossetti Patriot        32.65mm

X25                           33.1mm

X24                           33.1mm

Pro Slot                     31.12mm

Mossetti titan            31.31mm

[Jay Guard]

FYI...

one millimeter = .03937"

[Rob Voska]

This will probably turn into a long thread so lets use some accuracy here please.

 

1MM = 0.03937007874  Anything less than 11 decimal places simply won't work for these slot gods & their climate controlled rooms & high precision (old worn out calipers) measuring equipment.

[Cap Henry]

My plastic calipers only read out 3 decimals places... lol

[Zippity]

As per Post #90 earlier in this thread, below is a comparison of rear upright widths as supplied by Steve Meadows

 

C11 .025                  31.5mm

C21 .035                  31.0mm

C43 New                  33.37mm

Mossetti Patriot        32.65mm

X25                           33.1mm

X24                           33.1mm

Pro Slot                     31.12mm

Mossetti titan            31.31mm

 

According to the Convert add-on on my PC

 

31.5mm = 1.240154"

31.0mm = 1.220469"

33.37mm = 1.313776"

32.65mm = 1.285429"

33.1mm = 1.303146"

33.1mm = 1.303146"

31.12mm = 1.303933"

31.31mm = 1.232673"

 

[NSwanberg]

Math is math. Those who are saying the new JK chassis uprights are too wide, please explain it to me in math terms.

If you can, I'll shut up

There are three types of people in the world. Those who can count and those who can't.

[swodem]

I have been reading different series rules.I believe that these newer JK chassis are designed to meet the World rules 83 millimeters, not the old 3 1/4".

 the rear uprights are wide -- I had to grind the small rings off the hubs of my JK tires to JUST make the tech tool fit.  Might recommend the use of oilites with a flat surface.
 

These are the BSV ones I spoke of earlier.

Compared to a standard (Parma?) oilite. These have a flange I measured at .022 compared to .061 for the oilite (hard to measure due to taper but close)



And here you can see the oil groove/galley halfway in. I guess it also reduces friction surface area as well



Only negative is these BSV products come from the Ukraine which can be a pain in the 'mule' to transact with (no Paypal, huge costs to send money etc)

But some cool stuff


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[Pablo]

BTW, I like the "selfie" in post 235

[Fast Freddie]

You may want to try this out and see if it helps on rear spacing.  Instead of grinding the small spacers on the hubs grind off the small spacer on the short side of the gear.  I use a flat file to do it. It allows me to get the gear closer to the chassis as I can set the spacing, using thin bronze spacers, more precisely and that's a good thing.  It also reduces the length of the gear end motor shaft putting less stress on that bushing.

[Ralph Thorne]

Steve, would you happen to know the diameter of the inside shoulder on the BSV bushing?

[swodem]

Steve, would you happen to know the diameter of the inside shoulder on the BSV bushing?

Imperial



Metric




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[Ralph Thorne]

Thanks!

 

Does anyone in the US carry these?

[swodem]

I haven't seen any anywhere, would be a hell of a lot easier. Dealing with the Ukraine is difficult, expensive and slow. Even for me down here in NZ. Could change under Trump tho?


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[Phil Beukema]

Why the huge loops on the Cheetah A?

Anything larger than shown on the Czech Production car is a waste.

 

Is there a picture of the Czech Production car?

 

Thanks