'59/60 Cylinder heads

Information relating to the Matchless G12 or AJS Model 31 650cc twin
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Re: '59/60 Cylinder heads

Postby SPRIDDLER » Fri Oct 19, 2018 6:22 pm

robcurrie wrote:I had a bit of an accident (all by myself) on my CSR and rode over a badly marked and lit traffic island. Woke up in hospital with a broken leg, foot, heel and pelvis. It will take a while to get the CSR healthy again as well.
Cheers
Rob C

Dear oh dear, Rob, that's rotten luck.
Hope recovery goes well.
I poke badgers with spoons.

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Re: '59/60 Cylinder heads

Postby Martin.S » Fri Oct 19, 2018 7:18 pm

Ouch. Sounds like you'll want a Headlamp up grade!
A speedy recovery to you.

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Re: '59/60 Cylinder heads

Postby robcurrie » Sat Oct 20, 2018 5:24 am

Thanks Sprids and Martin, there might have been a touch of fatigue involved as well. As for lights; I remember seeing a kerb and island in front of me and thinking that it wasn't going to end well! Sorry about the thread hijack.

Rob C

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Re: '59/60 Cylinder heads

Postby clive » Sat Oct 20, 2018 6:29 pm

Wow Rob get well soon. The CSR is repairable concentrate on yourself first.
clive
if it ain't broke don't fix

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Re: '59/60 Cylinder heads

Postby Expat » Sat Oct 20, 2018 10:43 pm

Agree. Sounds like a very nasty surprise, hope you heal up quickly.

We always worry more about our bikes cos they’re helpless.
Keep shiny side up.

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Re: '59/60 Cylinder heads

Postby robcurrie » Sun Oct 21, 2018 3:43 am

Thanks Clive & Steve.
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Re: '59/60 Cylinder heads

Postby robcurrie » Tue Oct 23, 2018 9:49 am

Martin, here are some drawings of the model I created to calculate compression ratio of my CSR using measurements taken from the head and piston.

650 Cylinder Head.JPG


Combustion Chamber Assy.JPG


Compression Ratio.JPG


Hope this helps

Rob C
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Re: '59/60 Cylinder heads

Postby Martin.S » Wed Oct 24, 2018 5:02 pm

Thank you Rob - that is perfect.

There G15roy - a proper reply to a reasonable question!!

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Re: '59/60 Cylinder heads

Postby G15 Roy » Wed Oct 24, 2018 6:28 pm

Martin.S wrote:Thank you Rob - that is perfect.

There G15roy - a proper reply to a reasonable question!!


Noted and many thanks for your reply.
Roy

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Re: '59/60 Cylinder heads

Postby Janet » Wed Oct 24, 2018 7:35 pm

Martin.S wrote:Thank you Rob - that is perfect.

There G15roy - a proper reply to a reasonable question!!
Although Roy is big enough and ugly enough not to need sweet li'l ol' me to defend him, I'll risk your wrath and explain why I think you received some of the responses that you didn't appreciate.

You started this thread in the G12/M31 forum with the thread title '59/60 Cylinder heads which immediately makes people think that the answer you're looking for is to enable work on one of those machines. I'm a bit dim so thought that. Then you went on to talk about fitting a piston in a G5 and modifying the head. Therefore I believe that there was a misunderstanding about which engine you were actually wanting to modify.

If you'd started off by saying "I have a G5 and, if possible, I would like to fit a late G12 piston.........." you may have been spared the unhelpful replies. As has been stated on here in the past (paraphrased), sometimes the writing on the page doesn't convey the thought in the head.
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