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 Post subject: wedged stroker crank
PostPosted: Tue Apr 29, 2008 10:00 pm 
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1098cc
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Joined: Mon Nov 06, 2006 8:54 pm
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Location: Hunter NSW
Have got a unassembled stroker motor does it need wedging for an occasional driver
it will be balanced regardless


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 Post subject:
PostPosted: Tue Apr 29, 2008 10:01 pm 
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i wouldn`t bother if it`s just a roady/club race donk

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 Post subject:
PostPosted: Tue Apr 29, 2008 10:35 pm 
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religious status
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Location: near Baulkham Hills, NSW
I reckon it will run smoother if you do it- and the main bearings should last longer too.
Big journal 1275 crank has lousy counterweighting, this is accentuated by stroking.
My 1412 stroker ran as smooth as on the engine dyno, after I wedged it. :D

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject:
PostPosted: Wed Apr 30, 2008 1:52 am 
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1275cc
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Location: Sydney - strangely, I am glad of the sight of hills!!
drmini in aust wrote:
I reckon it will run smoother if you do it- and the main bearings should last longer too.
Big journal 1275 crank has lousy counterweighting, this is accentuated by stroking.
My 1412 stroker ran as smooth as on the engine dyno, after I wedged it. :D


mine too :D

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 Post subject:
PostPosted: Wed Apr 30, 2008 9:14 am 
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1360cc
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And mine :P :lol:


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 Post subject:
PostPosted: Wed Apr 30, 2008 4:02 pm 
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848cc
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wedging is?? :oops:


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 Post subject:
PostPosted: Wed Apr 30, 2008 4:48 pm 
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1275cc
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Joined: Mon Mar 22, 2004 7:41 pm
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Location: Plumpton, NSW
Trimming excess metal off the rounded counterweight parts of the crank.
I don't know the orign of the term wedging (in relation to cranks :D ), but the ones I've seen end up being a bit triangular in shape, so maybe the "wedge" comes from that.

That'll do until Doc comes in and explains in proper engineer terms.....
KB

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 Post subject:
PostPosted: Wed Apr 30, 2008 4:50 pm 
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Location: near Baulkham Hills, NSW
Wedging is removal of metal from the crankwebs on the side nearest each crankpin.
This has the same balancing effect as making the counterweights bigger, but it also reduces the rotational mass (inertia) of the crank.

Here's some pics of mine- I did it at home on the mill then got GR to balance it.
Image
Image
Image

<edit> that centre main strap in the last pic I made too, it's EN25, tuff stuff- made to fit the near-standard bearing cap without milling it flat (and thus weakening it). Bolts are Grade 8 hi tensile.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Wed Apr 30, 2008 5:00 pm, edited 1 time in total.

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 Post subject:
PostPosted: Wed Apr 30, 2008 4:58 pm 
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1275cc
1275cc

Joined: Mon Mar 22, 2004 7:41 pm
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Location: Plumpton, NSW
So the term "wedging" comes from.........????
Cmon Doc, you're letting me down! :lol:
KB

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 Post subject:
PostPosted: Wed Apr 30, 2008 5:01 pm 
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Look at the 2nd pic, it looks like a wedge.... :lol:

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject:
PostPosted: Wed Apr 30, 2008 7:15 pm 
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1275cc
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Location: Sydney - strangely, I am glad of the sight of hills!!
make sure you also rebuild your harmonic balancer or get a new one. will help a lot to minimise harmonics that these cranks suffer from.

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the world is a book, and those who do not travel read only a page
66 Mini Minor sponsored by http://www.lifeonthehedge.com.au/ The Dog Harness Specialists
It was a pleasure ausmini. I'll miss all you misfits and reprobates ;-)


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 Post subject:
PostPosted: Wed Apr 30, 2008 7:19 pm 
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Location: near Baulkham Hills, NSW
mickmini wrote:
make sure you also rebuild your harmonic balancer or get a new one. will help a lot to minimise harmonics that these cranks suffer from.

Also, lightening the flywheel assembly will reduce and move the harmonics further up the RPM scale.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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 Post subject:
PostPosted: Wed Apr 30, 2008 8:11 pm 
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1360cc
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Joined: Mon May 03, 2004 6:46 pm
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Location: ADL
This be moine
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 Post subject:
PostPosted: Thu May 01, 2008 8:17 am 
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848cc
848cc

Joined: Sat Nov 11, 2006 5:27 pm
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Location: Auckland, NZ
Dr Mini, That Centre main strap looks great. I always wondered why, when the idea is to add strength to the centre cap, you have to mill some off to add a strap.
Any chance of you running off a few to sell to us more technically challenged?


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 Post subject:
PostPosted: Wed May 07, 2008 11:00 pm 
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1360cc
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Joined: Mon Nov 01, 2004 4:36 pm
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stocko small journal
Image

smallblock stroker crank (1100)

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