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Author Topic: New build start..GN Thunderbug.  (Read 12381 times)

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #30 on: 25 June 2019, 09:40:53 pm »
Engine mounted but not yet started up! Maybe tomorrow.
Drive connected with #35 chain and split link. Disc on, with ‘small’ cable operated calliper....probably too small, but had it lying around! I think I need to control lateral movement of the axle. I am going to put locking collars on but feel inclined to add a steel plate to the chassis inside, to act as a thrust bearing. Any thoughts?
I would just grease between the plate and collar.
Body work started with the floor. I’m using 9mm ply. There is enough for the sides as well. Bonnet in alloy, and rear bodywork in alloy.
Most people have a removable rear section. More work...!

RhysN

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Re: New build start..GN Thunderbug.
« Reply #31 on: 26 June 2019, 06:57:51 pm »
Lock that axle with lock collars. The split ones work best. If you don't you will get brake bind and probably throw chains. (Learned the hard way)
With your caliper, just check to make sure it can move if it needs to, or doesn't if it shouldn't. i have something here where the caliper had been bolted up, so to get the other side from the moving piston to work the disc itself was bending.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #32 on: 27 June 2019, 09:53:46 pm »
Thanks Rhys...already ordered some locking collets. Calliper body slides when applied so disc is not compromised.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #33 on: 28 June 2019, 10:40:01 pm »
Steering coupled up today. There is a lot of play in the central part of the rack. It’s a plastic shell and doesn’t seem to hold the wheel part particularly securely. Time will tell if it stays together.
Some more bodywork done, including the scuttle, I’ve put a steel frame behind it to support the steering column. The column is one piece with a Uj at the rack end and a sliding joint at the top. The whole column will move up and down as the axle moves.   Still lots to do!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #34 on: 28 June 2019, 10:43:26 pm »
Forgot to add latest pics....

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #35 on: 30 June 2019, 10:12:31 pm »
Finally up onto its wheels! Spent the day connecting brake and throttle cables to the pedal setup. Will try and track down a 5/16 UNF bolt tomorrow for the crankshaft.
Should be ready then for a road trial! Just remembered...got to fix the seat in!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #36 on: 06 July 2019, 01:49:14 pm »
HELP......first test drive this afternoon. Problem with TAV. The large pulley with the red spring is not tight enough, causing the outer part to jump past the rubber cones.
Is there a specific torque for this nut?

StefanN

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Re: New build start..GN Thunderbug.
« Reply #37 on: 06 July 2019, 02:35:54 pm »
I don’t have the info with me but I got it from a manual I found online.

RhysN

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Re: New build start..GN Thunderbug.
« Reply #38 on: 06 July 2019, 04:13:47 pm »
Have you had it apart? I know that I did once and assembled it with the driven plate the wrong side of the rubber cones. I'm not sure that red spring is the right one, obviously could be wrong, I thought it was the green one. Colours mean different "strengths". Try giving Gemini a call.
 I seem to remember 45ft lbs.
Try this youtube link, all is revealed. https://www.youtube.com/watch?v=kmGY0qsgW4Y
« Last Edit: 06 July 2019, 04:16:24 pm by RhysN »

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #39 on: 06 July 2019, 07:10:15 pm »
Panic over guys....turned out to be a loose chain. My neighbour said it was the cone...I thought it was the chain and I was right! 
Drives like a pile of ****.  No brakes.....needs work!

RhysN

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Re: New build start..GN Thunderbug.
« Reply #40 on: 07 July 2019, 07:42:10 pm »
The car looked great, and for maiden voyage went really well I think.
The front engine is a work of art, really great.

RhysN

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Re: New build start..GN Thunderbug.
« Reply #41 on: 09 July 2019, 07:55:45 am »
After the drive, and again apologies, the biggest thing which I think might make it more enjoyable for you would be to lower the seat some. Otherwise I think it went pretty well. Brakes of course.

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #42 on: 09 July 2019, 01:16:15 pm »
Hi Rhys...thanks for your comments. I have got some changes to make! The brakes failed because the cable slipped at the joint on the pedal. I think I will go hydraulic now.
I was driving the CK like a kart, expecting too much in the way of handling. The high C of g doesn’t help, poor brakes, and probably the two wheels driven aspect all contribute to a more gentle approach being required!

Slack Alice

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Re: New build start..GN Thunderbug.
« Reply #43 on: 11 August 2019, 08:49:46 pm »
Desperately trying to get the kart sorted for Stretton.
New hydraulic brakes fitted, as yet untested!
Aluminium acid primed ready for paint and I’m busy creating a mock petrol tank to sit above the engine.
I’ve re jigged the throttle on the engine. I saw a utube video of some guy ‘bypassing the governor’. Thought I’d give it a go.
Unfortunately, whilst turning what I thought was the throttle stop, I seem to have upset the mixture! Does anyone know the original setting?

RhysN

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Re: New build start..GN Thunderbug.
« Reply #44 on: 11 August 2019, 09:57:04 pm »
On most original type carbs the only adjustments you can make are the idle and full throttle stops. If you can take a photo help may be available!