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Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 3:39 pm
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

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 4:29 pm
by SPRIDDLER

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 4:31 pm
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

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 5:11 pm
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.

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 5:50 pm
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. 🙃

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 6:04 pm
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?

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 6:59 pm
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.

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 9:46 pm
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. :?

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 10:04 pm
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. 🙂

Re: Building a Scrambles G80 Bitsa

Posted: Sun Nov 12, 2023 10:28 pm
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: