Building a Scrambles G80 Bitsa

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RichardS
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Re: Building a Scrambles G80 Bitsa

Post by RichardS »

Can anyone tell me the correct length of the clutch operating pushrod for a AMC gearbox?

I have a pushrod, but it's way too long. I suspect it came out of a Burman CBP? (bigger version of the CP), but whatever the origin, it's a chunk too long.

TIA
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Richard

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SPRIDDLER
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Re: Building a Scrambles G80 Bitsa

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Last edited by SPRIDDLER on Sun Nov 12, 2023 4:31 pm, edited 1 time in total.
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dave16mct
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Re: Building a Scrambles G80 Bitsa

Post by dave16mct »

According to F.Neill 54-58 singles have 9 5/32" alloy pushrods. I can't find the clutch pushrod length but my 58 G11 is 9 5/8"with AMC box and clutch using 4 friction plates. You can cut yours to length and harden the ends.
Dave
RichardS
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Re: Building a Scrambles G80 Bitsa

Post by RichardS »

dave16mct wrote: Sun Nov 12, 2023 4:31 pm According to F.Neill 54-58 singles have 9 5/32" alloy pushrods. I can't find the clutch pushrod length but my 58 G11 is 9 5/8"with AMC box and clutch using 4 friction plates. You can cut yours to length and harden the ends.
Dave
Yes, that's what I was planning to do. Just wanted a pointer so I didn't chop it down too much.

I (obviously) haddn't looked in the club spares list - thanks Spridler.
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Richard

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Joker_Bones
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Re: Building a Scrambles G80 Bitsa

Post by Joker_Bones »

Here you go...
IMG_20231112_174113~2.jpg
IMG_20231112_174125~3.jpg
If you can make head or tail of it. 🙃
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Joker_Bones
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Re: Building a Scrambles G80 Bitsa

Post by Joker_Bones »

The push rods that came with my bitsa ally barrel engine were a tad too long...
IMG_20230808_163911.jpg
I pushed them out of the top sleeve, shortened them a bit and made a couple of new sleeves at the same time as the originals very pitted and the hexes rounded off.

The couple of iron barrel singles I have looked in both had alloy push rods... Perhaps the alloy rods go with alloy heads?
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RichardS
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Re: Building a Scrambles G80 Bitsa

Post by RichardS »

Joker_Bones wrote: Sun Nov 12, 2023 6:04 pm The push rods that came with my bitsa ally barrel engine were a tad too long...IMG_20230808_163911.jpg
I pushed them out of the top sleeve, shortened them a bit and made a couple of new sleeves at the same time as the originals very pitted and the hexes rounded off.

The couple of iron barrel singles I have looked in both had alloy push rods... Perhaps the alloy rods go with alloy heads?
I'm really happy to see someone else who doesn't mind getting stuck in with a pragmatic view of "well it's buggered now, how much worse could it get?" attitude. Time was when I was rather too reverential of 'original' but I'm over that now. :D

I didn't realise it would be so 'easy' to push out the rod from the end or I would hve had a go at that. I may yet do so in view of the minimal clearance I have and if the valves sink significantly after some running I might just run out of adjustment.
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Richard

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Re: Building a Scrambles G80 Bitsa

Post by SPRIDDLER »

RichardS wrote: Sun Nov 12, 2023 3:39 pm Can anyone tell me the correct length of the clutch operating pushrod for a AMC gearbox?
Am I losing the plot here but on my screen Richard's asking about the clutch pushrod, not the valve pushrods. :?
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Joker_Bones
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Re: Building a Scrambles G80 Bitsa

Post by Joker_Bones »

RichardS wrote: Sun Nov 12, 2023 3:27 pm So what's the deal with Push Rods? I have seven to choose from and they're 3 different pairs plus a stranger....
Was asking after both. 🙂
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Re: Building a Scrambles G80 Bitsa

Post by SPRIDDLER »

Joker_Bones wrote: Sun Nov 12, 2023 10:04 pm
Was asking after both. 🙂
Ah. I didn't go back a page so didn't see that the engine pushrods question had been posted. :oops:
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