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Kiwi Cycle Kart Downhill Racer

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Pyro-Kiwi Simon Osborne
Ongaonga, Central Hawke's Bay, New Zealand   NZL
Kia ora from Aotearoa (NZ)

This has been on the books for a wee while. Here are a number of shots of the chassis and front axle with wheels mocked up for my sons Kiwi Downhill Racer that I am making.

It is my intent that this chassis will be used later to build a Cyclekart with a live rear axle and Hond a motor after its competes I a local gravity race later this year.

Specs are as follows:

Chassis (2140 mm x 75 mm x 20 mm x 2 mm square tube)
Front axle is 1 5/8 (2.5 mm wall) round tube
Front springs (20 mm wide, made by cutting a small trailer leaf down the centre)
Front Spring Hangers (modified trailer hangers)
Rear axle is temporary (will be replaced with a live axle gravity race)
Wheels & Tyres (17" Front & Rear to suit 15 mm axle)
Hydraulic Brake Assembly Rear (complete with caliper, disc, hose & brake lever)
Front Stub Axle/Front Spindle (shaft length 72 mm Shaft diameter 15 mm)
Front Stub Axles (Needs new arms to suit Akermann)


Front Axle Design - I used the Vinson drawing No 3 for my front axles.

Front Axle Caster- I haven't welded the plates on the axle yet so I can adjust the caster.

Front Axle Camber - I may have way too much camber as a result of using Stub Axles/Spindles from a local gokart firm

Anyways, I am so grateful to a number of members for their guidance and support.

Cheers Simon

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Attachments:
Kiwi Cycle Kart Downhill Racer.jpg    26.3 KB
Kiwi Cycle Kart Downhill Racer.jpg

20170714_163157.jpg    33.7 KB
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Hydraulic Brake Unit Complete.jpg    20.3 KB
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Butterfly Style or Formula One Steering Wheel.jpg    13.4 KB
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Woodysrods Brian Woods
Westbank B.C., Canada   CAN
Looks Great!
It will make a fun gravity Racer...............and then even more fun as a cyclekart.
You guys are getting quite movement together there in NZ.
And yes, my feelings are that you have way too much "Camber". But a little cut and weld will fix that.
I would not go more than 3 degrees.
Good Luck with your project and thanks for sharing.
Have Fun!
Good Roads
Brian
"Woody"

Pyro-Kiwi Avatar
Pyro-Kiwi Simon Osborne
Ongaonga, Central Hawke's Bay, New Zealand   NZL
Thanks for the feedback and tips re - 3 degrees Brian

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DavidMGA1600 Avatar
DavidMGA1600 Silver Member David Lake
Gold Coast, Queensland, Australia   AUS
1935 CycleKart Great Britain
1960 MG MGA "Dads Car"
1961 CycleKart Race Car "Team Ferrari"
Simon, exactly what we did with our CK, made it a gravity racer first, won some trophies, then whacked an engine in the back.

Camber, I hope the camera is doing tricks as that is a hell of a lot of camber if you have built it like that.



David

1960 MGA 1600 Convertible,
Gold Coast, Australia.

Woodysrods Brian Woods
Westbank B.C., Canada   CAN
Yes Simon, some camber is good, but you don't need to get carried away unless you are going for a look. Like GN's had.
The most important thing on these little CycleKarts and Gravity Racers with their narrow wheels and quick steering is "Caster".
Most guys are running 8 to 10 degrees. This makes keeping it straight at speed a lot easier.
The one thing that has seemed to be over looked by most, and is obviously not as important is "King Pin Inclination" and making it line up with the "Patch"???????

Notso-Chinsee Avatar
Notso-Chinsee Gold Member Albert Lies
Spokane Valley, Washington (WA), USA   USA
Simon,
Put a whole lot of caster in it and you know it will go straight maybe a bit hart to steer though.
Sorry I had to say it. What type if steering are you going to use drag link, cross steer rack and pinion or ? You have a great start keep us posted.



Al Lies
The "Not-So Chinsee" guy

PDXBryan Bryan Dickerson
Troutdale, Oregon, USA   USA
That looks like a ton of camber but I thought the same about Joey's DeSoto at Tieton. Joey said it handled great, so there ya' go.

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Pyro-Kiwi Avatar
Pyro-Kiwi Simon Osborne
Ongaonga, Central Hawke's Bay, New Zealand   NZL
Thanks Bryan, I hadn't allowed for the angle in the stub axles that I purchased from a local grass kart supplier. Plan "B" cut and re-weld axle shafts on stub axles.

Pyro-Kiwi Avatar
Pyro-Kiwi Simon Osborne
Ongaonga, Central Hawke's Bay, New Zealand   NZL
Thanks Brian....Version "B" is on its way 3 deg

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Woodysrods Brian Woods
Westbank B.C., Canada   CAN
In reply to # 25323 by PDXBryan That looks like a ton of camber but I thought the same about Joey's DeSoto at Tieton. Joey said it handled great, so there ya' go.
I too questioned Joey about his handling, and he said it handled great.
But I put myself in a position to watch his Kart through turn one & two at the Tieton Grand Prix, and noticed a distinct shimmy as he passed thru the apex of both of this turns.
Not smooth thru the corners like the other Karts that were in that same heat.
Brian
PS
It was obviously manageable!

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