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GENERAL QUESTION: ENGINE MOUNTING

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SevenTurbanBourban Avatar
SevenTurbanBourban Christobal Welchissimo
Auburn Hills, MI, USA   USA
1934 CycleKart Custom "Type-69"
1938 CycleKart Race Car "Rotten Tuna"
K. I have been searching for a suitable material to 'dampen' the vibration of the 212 cc engine and am hitting a wall. I thought stacking nylon/silicon cutting boards would be sufficient but they are too stiff and not heat resistant enough. Then I found a chunk of 'SBR' Rubber which dampens vibration well but is not very heat resistant. The stuff that does the job is called Mil Spec ZZR-765 (A-A-59588 ) and for a .5" chunk big enough to do the job is $100, not exactly Cycle Kart budget friendly.

So who has had success in this realm? Any ideas?

cw



Bugatti Type-69 build page http://www.cyclekartdesign.com/

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carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
I got 4 rubber mounts from the bottom of an old generator. They have studs that go into the base of the motor and the mounting plate.



S'all for now!

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SevenTurbanBourban Avatar
SevenTurbanBourban Christobal Welchissimo
Auburn Hills, MI, USA   USA
1934 CycleKart Custom "Type-69"
1938 CycleKart Race Car "Rotten Tuna"
Do you remember the name/model of the genny?

Cw



Bugatti Type-69 build page http://www.cyclekartdesign.com/

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carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
It was a Champion 4000. I looked at a few new ones and they all had those motor mounts. Here's a picture, the short stud goes through the plate and the long stud goes through the motor.



S'all for now!


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SevenTurbanBourban Avatar
SevenTurbanBourban Christobal Welchissimo
Auburn Hills, MI, USA   USA
1934 CycleKart Custom "Type-69"
1938 CycleKart Race Car "Rotten Tuna"
Are these metal angle mounts?

Cw



Bugatti Type-69 build page http://www.cyclekartdesign.com/

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carChips Avatar
carChips Victor Harnish
Kelowna, BC, Canada   CAN
1933 MG Magnette
1973 Triumph Spitfire 1500 "Chip"
1989 GMC Sierra 1500 "Bush Truck"
They have a rubber vibration isolation between two metal plates. The whole thing mounts in there at an angle. The one on the right in my picture will tip to the left so the studs go staight up and down.



S'all for now!

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DavidMGA1600 Avatar
DavidMGA1600 David Lake
Gold Coast, Queensland, Australia   AUS
1960 MG MGA "Dads Car"
1961 CycleKart Race Car "Team Ferrari"
CW,

Here is a very simple looking mounts from a land rover. The web page i found them on was UK4.33. Something similar should be available from a decent autoshop with a helpful assistant or try ebay.

David



David

1960 MGA 1600 Convertible,
Gold Coast, Australia.


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SevenTurbanBourban Avatar
SevenTurbanBourban Christobal Welchissimo
Auburn Hills, MI, USA   USA
1934 CycleKart Custom "Type-69"
1938 CycleKart Race Car "Rotten Tuna"
http://www.jcwhitney.com/energy-susp-universal-motor-mount/p3052925.jcwx?filterid=u0j1

I found some transmission mounts that seem similar on JC Whitney but no idea how they perform. Other problem is they seem kinda pricey, i dont wanna spend $60 plus shipping for 4 mounts the same size.

Back to square one, gonna keep searching...

cw



Bugatti Type-69 build page http://www.cyclekartdesign.com/


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DavidMGA1600 Avatar
DavidMGA1600 David Lake
Gold Coast, Queensland, Australia   AUS
1960 MG MGA "Dads Car"
1961 CycleKart Race Car "Team Ferrari"
CW,

Can you not use the range rover mounts above? They are listed extreamly cheaply.



David

1960 MGA 1600 Convertible,
Gold Coast, Australia.

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SevenTurbanBourban Avatar
SevenTurbanBourban Christobal Welchissimo
Auburn Hills, MI, USA   USA
1934 CycleKart Custom "Type-69"
1938 CycleKart Race Car "Rotten Tuna"
I was able to find them for $10.26 each on this site:

http://www.autopartsway.com/Part.cfm?W0133-1633398/AMR&gclid=CM_umqrIkLQCFQpgMgod-1oA-A

But I think i'm going to try something different, I managed to find some skateboard shock pads in 1/2" that were $4.99

http://www.amazon.com/Focus-International-Shock-Pads-Black/dp/B008JLJFBM

This urethane rubber compound is flexible, will dampen, and is easy to drill/machine. I have to try out some high temp applications but I dont think the engine gets hotter than 200 deg. My concern is they will melt.

cw



Bugatti Type-69 build page http://www.cyclekartdesign.com/


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DavidMGA1600 Avatar
DavidMGA1600 David Lake
Gold Coast, Queensland, Australia   AUS
1960 MG MGA "Dads Car"
1961 CycleKart Race Car "Team Ferrari"
Cw, the only concern i would have with the skateboard shock pads is as soon as you slide a bolt through and tighten, the vibration will pass directly thought the bolt into the chassis. The threaded rod in the engine mount is non-continuous so the vibration is cushioned.

David



David

1960 MGA 1600 Convertible,
Gold Coast, Australia.

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smcameron Stephen Cameron
Santa Clara, CA, USA   USA
I used these:

http://www.northerntool.com/shop/tools/product_35041_35041

I'm guessing those are more or less the default choice for mounting a gx200 on a gokart, so probably you're already aware of those and find them insufficient?

They seem to work ok for me, which is to say, excessive vibration does not seem to be a problem (sitting in the kart -- vibration is not someting which is even noticeable -- watching the engine while it runs -- it seems to be alright.)


-- steve

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felix37 jonathan myren
Chattanooga, TN, USA   USA
what about using polyurethane shock/sway bar bushings? they are in expensive and can be found at most auto parts stores.
Just a thought!
Jonathan

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KartBuilder29 Avatar
KartBuilder29 Michael Droll
Houston, USA   USA
1920 CycleKart Pre War "Burgundy Betty"
I found that my chain would jump the sprocket and make a loud "clunk" when i used any type of rubber bushing. I fixed the problem with 1/2 birch HQ plywood. the problem with the rubber bushings is it allows the engine to tilt with the tension on the chain, unless you can config some sort of auto-tensioner your better off with the plywood. If it is the vibrations your are worried about, they are minimal and nothing a seat cushion can't fix. And as long as you use locking washers or nylon they will not come lose.



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