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Schumacher Mi4

Old 06-14-2012, 05:15 PM
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Originally Posted by Luvs-cougars View Post
Thanks for the help guys, I now believe it's just 2 blue o-rings or the clear o-ring plus spacer. Think the 2 blues give longer use but with more drag (and less leakage) and the clear o-ring plus spacer gives less drag but less time before rebuilds.
When I was in a pinch and couldn't get the blue o-rings I used HPI red o-rings
they work fantastic and are quite inexpensive (like $3.00 for 8). The HPI out and inner diameter is slightly bigger than the Schui o-rings.

Tamiya are smaller, Top blues are smaller...X brand are way smaller...
Associated red o-rings may work but haven't sized them up.

I personally would not run the shock without the lower spacer, the spacer is working as a guide. Without it the shaft will sway allowing the piston to rub the inner shock cylinder.
Just my opinion of course. Run'em any way you want to build them.
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Old 06-14-2012, 05:26 PM
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Originally Posted by kp-61 View Post
just incase some are wondering how to mount a fan on our cars. I had the double sided tape for some time but does come off when i hit the wall







and my custom chassis protector... This was after few races with some mishaps along the way LOL

Nice car, check out the R1-Wurks fans, no need for tape, you can get them thru Stormer
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Old 06-15-2012, 05:31 AM
  #3588  
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Originally Posted by olhipster1 View Post
When I was in a pinch and couldn't get the blue o-rings I used HPI red o-rings
they work fantastic and are quite inexpensive (like $3.00 for 8). The HPI out and inner diameter is slightly bigger than the Schui o-rings.

Tamiya are smaller, Top blues are smaller...X brand are way smaller...
Associated red o-rings may work but haven't sized them up.

I personally would not run the shock without the lower spacer, the spacer is working as a guide. Without it the shaft will sway allowing the piston to rub the inner shock cylinder.
Just my opinion of course. Run'em any way you want to build them.
I see what you mean about the piston rubbing the cylinder more, but wouldnt it sway and rub anyway even with the spacer as it's not a tight enough fit to keep the piston exactly true when shock is compressed. Not an expert on fluid dynamics but wouldn't there always be oil moving around the sides of the piston to keep it true?

Just built two shocks, one with 2 blues, one with 1 clear + spacer, doesn't seem any less sway at piston head with either option. piston still wobbles around and rubs inside of cylinder with either.
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Old 06-15-2012, 08:49 AM
  #3589  
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Originally Posted by Luvs-cougars View Post
I see what you mean about the piston rubbing the cylinder more, but wouldnt it sway and rub anyway even with the spacer as it's not a tight enough fit to keep the piston exactly true when shock is compressed. Not an expert on fluid dynamics but wouldn't there always be oil moving around the sides of the piston to keep it true?

Just built two shocks, one with 2 blues, one with 1 clear + spacer, doesn't seem any less sway at piston head with either option. piston still wobbles around and rubs inside of cylinder with either.
Shim the piston (under piston is best result) it will remove all piston movement.
makes a huge difference...you will be surprised.
I have to thank Mike Haynes for that tip.
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Old 06-15-2012, 09:31 AM
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Originally Posted by Luvs-cougars View Post
I see what you mean about the piston rubbing the cylinder more, but wouldnt it sway and rub anyway even with the spacer as it's not a tight enough fit to keep the piston exactly true when shock is compressed. Not an expert on fluid dynamics but wouldn't there always be oil moving around the sides of the piston to keep it true?

Just built two shocks, one with 2 blues, one with 1 clear + spacer, doesn't seem any less sway at piston head with either option. piston still wobbles around and rubs inside of cylinder with either.
the spacer stops the two small blue o-rings from vertical play, try oring-spacer-oring-bush---what color is the spacer (black or white)?
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Old 06-15-2012, 10:04 AM
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Thanks FK.. ordered some fans for backup!
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Old 06-15-2012, 12:05 PM
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Originally Posted by poochy View Post
the spacer stops the two small blue o-rings from vertical play, try oring-spacer-oring-bush---what color is the spacer (black or white)?
It's a white spacer and I don't think there's enough room in the shock bottom for it plus 2 blue o-rings.
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Old 06-15-2012, 10:29 PM
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Originally Posted by Luvs-cougars View Post
It's a white spacer and I don't think there's enough room in the shock bottom for it plus 2 blue o-rings.
I tried building like that a few weeks ago
Does not work, not enough room.
If you can go to a LHS take the blues and measure to other stuff. If you're lucky you'll find a slightly larger diameter o-ring.

HPI was the best fit that I found but there may be others.

Mine never leak at this time.
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Old 06-16-2012, 10:43 AM
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Originally Posted by Luvs-cougars View Post
It's a white spacer and I don't think there's enough room in the shock bottom for it plus 2 blue o-rings.
I thnk i used the cougar sv blck spacer......ill take it apart n let u knw for sure
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Old 06-16-2012, 03:45 PM
  #3595  
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Just bought some shorty lipos from hk, mainly for my cougar but noticed some people are using them on a TC with esc mounted behind them opposite the motor. Is this possible on a cx? Just wondering about securing the battery, not sure if I want to start dremmeling the chassis. Has anyone done this yet?
I'm just using battery tape and the kit lipo retainer at the moment
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Old 06-16-2012, 05:23 PM
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Originally Posted by olhipster1 View Post
I tried building like that a few weeks ago
Does not work, not enough room.
If you can go to a LHS take the blues and measure to other stuff. If you're lucky you'll find a slightly larger diameter o-ring.

HPI was the best fit that I found but there may be others.

Mine never leak at this time.
Olhip, whn u tried the two o-rings, did u put oil in it and tried movng the shaft? Without oil it binds really bad so it appears it wont work...fill with oil thn test
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Old 06-16-2012, 10:55 PM
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Default Belt clearance

Just install the long top deck conversion and the front belt seems too close to the top deck. I check the front diff and get as much shims i can on the left side but still seems too close. Anybody run in the same problem or did I get the wrong front diff ?
Attached Thumbnails Schumacher Mi4-photo.jpg   Schumacher Mi4-photo-1-.jpg  
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Old 06-18-2012, 11:57 AM
  #3598  
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The main issue there is that the spec - R gear diff isn't designed to fit the front of the Mi4, only the rear. It does "kind of" fit, but as you can see from your picture this causes the belt to run on an angle across the chassis.
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Old 06-19-2012, 07:48 AM
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Originally Posted by MattW View Post
The main issue there is that the spec - R gear diff isn't designed to fit the front of the Mi4, only the rear. It does "kind of" fit, but as you can see from your picture this causes the belt to run on an angle across the chassis.
Thanks swap back front spool problem solved.
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Old 07-01-2012, 03:13 AM
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Question.

What effects does the twin point steering have over the single point?

http://www.racing-cars.com/pp/New_Ca...CXL/U3774.html
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