Author Topic: McBob's big banger at 157cc Super Mac  (Read 1309 times)

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Offline mcbob

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Re: McBob's big banger at 157cc Super Mac
« Reply #20 on: June 09, 2015, 11:05:08 pm »
Well the 70mm pistons will be on their way shortly thanks EJ ...................... HAPPINESS IS A BIG BORE MAC at 10.4 cubes

That's why the delay in build progress

I am a idiot so my pics disappeared.

Offline srcarr52

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Re: McBob's big banger at 157cc Super Mac
« Reply #21 on: June 10, 2015, 02:05:30 pm »
Is that a custom billet slug?

Offline Cut4fun .

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Re: McBob's big banger at 157cc Super Mac
« Reply #22 on: June 10, 2015, 03:08:09 pm »
Is that a custom billet slug?

EJ had them made. Thread info and pics toward the end. http://chainsawrepair.createaforum.com/ported-work-race/070090-4591/

Offline mcbob

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Re: McBob's big banger at 157cc Super Mac
« Reply #23 on: June 19, 2015, 07:56:33 pm »
Pistons arrived yesterday morning so its off to the machine shop Monday
I am a idiot so my pics disappeared.

Offline mcbob

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Re: McBob's big banger at 157cc Super Mac
« Reply #24 on: August 18, 2015, 01:00:57 am »
Wow its getting closer after a rather long long wet week

And the great part is it's almost done had a look today and only the oil tank mount needs drilling and tapping.

Photo to follow ................ whoo hoo
I am a idiot so my pics disappeared.

Offline mcbob

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Re: McBob's big banger at 157cc Super Mac
« Reply #25 on: August 20, 2015, 09:08:48 pm »
Pic showing material around border of cylinder plenty to handle a 70mm overbore and a fresh coat of Nicasil





And the new crankcase has been built with an added 3.2mm in height so the piston doesn't pop out.

McBob
I am a idiot so my pics disappeared.

Offline mcbob

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Re: McBob's big banger at 157cc Super Mac
« Reply #26 on: August 23, 2015, 08:43:28 pm »
Crankcase is done still needs a fiddly bit attended to now I can do the port timing









Now to get her all together .............. McBob
I am a idiot so my pics disappeared.

Offline aclarke

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Re: McBob's big banger at 157cc Super Mac
« Reply #27 on: August 23, 2015, 09:20:09 pm »
Looking good.

 

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