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#Post#: 52023--------------------------------------------------
McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 5, 2015, 7:07 pm
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Well I've been yapping about it for long enough so it's been
started that's the basic putting together that is I have mocked
up the cylinder and crankcase assy and have new parts here to
get her done plus a pensioner machinist mate to help build the
new crankcase assy to unite the Mac crankcase to the 090
cylinder the basic dimensions sound good 66mm bore and 46.5 mm
stroke about 157cc give or take a tad
[URL=
HTML http://s18.photobucket.com/user/ozflea/media/090maccylinder11_zps0145c47d.jpg.html][IMG]http://i18.photobucket.com/albums/b108/ozflea/090maccylinder11_zps0145c47d.jpg[/img][/URL]
This engine will be a build using all brand now components and
some parts I will be using I wont be disclosing .... but it will
be interesting I can assure you
Here's part of the new cylinder assy's along with pistons I have
here to set up and test with.
[URL=
HTML http://s18.photobucket.com/user/ozflea/media/06012015402_zpsdd67608a.jpg.html]http://i18.photobucket.com/albums/b108/ozflea/06012015402_zpsdd67608a.jpg[/URL]
The Mac crankshaft and rod are new as are the needle rollers for
the rod and new main bearing are all here just waiting on the
machinist and the phone call to say the crankcase is done and
dusted.
The aim is to get a standard look to the big bore SP125c
McBob
P.S Neil you always said to stop yapping about it and get it
done well it's on its way
And proudly supported by
[URL=
HTML http://s18.photobucket.com/user/ozflea/media/austpensioner_zps022be538.jpg.html][IMG]http://i18.photobucket.com/albums/b108/ozflea/austpensioner_zps022be538.jpg[/img][/URL]
#Post#: 52027--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: Chainsawrepair
Date: January 5, 2015, 7:13 pm
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Cool. Thinking outside the box.
Be neat to actually see it in the cut in the future.
#Post#: 52030--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 5, 2015, 7:23 pm
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--- Quote from: Cut4fun_ link ---
>
> Cool. Thinking outside the box.
>
> Be neat to actually see it in the cut in the future.
>
--- End Quote ---
Not my idea originally the basic concept was created by a farmer
in the sticks in the late 70's who built a Mac 15 and using a
090 cylinder quite a few years back great idea but it didn't
work but I have the needed bits to get her to 157cc something he
didn't have.
[URL=
HTML http://s18.photobucket.com/user/ozflea/media/090%20Mac%2015/7a_zps1c308566.jpg.html]http://i18.photobucket.com/albums/b108/ozflea/090%20Mac%2015/7a_zps1c308566.jpg[/URL]
Plus he went to all the hassle of getting it running but only
achieved 120cc dam.
#Post#: 52087--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 7, 2015, 1:33 pm
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Got a quick call from the pensioner machinist yesterday all is
progressing nicely might have her back that's the block of
course next week ............ hope so
#Post#: 52093--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: aclarke
Date: January 7, 2015, 4:28 pm
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Should be interesting Bob!
#Post#: 52108--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 7, 2015, 9:09 pm
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Hope so Adam .................... over the years I have put
aside the odd bits and pieces you know, those for a special
occasion well one of em fitted the bill nicely and with very
little real work will get this thing mobile
#Post#: 52235--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: Al Smith
Date: January 9, 2015, 10:50 pm
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So then by "standard " looking does that mean a horizontal
cylinder or standing up like an 090? If it's horizontal you're
going to need the deal with a bottom discharge exhaust .
#Post#: 52238--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 9, 2015, 11:54 pm
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Yes should not be a problem Al and it will be horizontal layout
and a standard SP125 muffler hopefully
#Post#: 52243--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: Al Smith
Date: January 10, 2015, 8:36 am
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You're going to have to fab something up to take it down under
and out the side without having a dead end square transition to
get the full benefit of that larger cylinder .
Whatever it is it looks like an interesting idea .
So what then about the rod and piston pin .125 rod,kart rod like
a Horstman?
#Post#: 52267--------------------------------------------------
Re: McBob's big banger at 157cc Super Mac
DIR By: mcbob
Date: January 10, 2015, 2:13 pm
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Rod and piston pin sorted Al ...... sorry
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