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cooperess
 Post subject: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 7:36 am 
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1098cc
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Joined: Wed Sep 30, 2015 9:38 am
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Location: Brandy Hill, NSW
I have several crownwheels marked 17/62.

Is it ok to match an 18 tooth pinion with the crownwheel mark 17/62?

If not why not?
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drmini in aust
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 7:43 am 
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Location: near Baulkham Hills, NSW
No.
Because the 18T pinion is bigger diameter. The 62T crown wheel that belongs with it is slightly smaller than yours, and a different part number.
Pinions are interchangeable, but crown wheels are specific to one ratio.

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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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cooperess
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 9:31 am 
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1098cc
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Location: Brandy Hill, NSW
If the 62T crown wheel has no identifying marks, how do you ID it as being an 18/62 crown wheel?
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drmini in aust
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 2:32 pm 
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Location: near Baulkham Hills, NSW
Part number is stamped near the bolt holes. 22A 411.
The one that goes with a 17T pinion is stamped 22G940.

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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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cooperess
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 2:35 pm 
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1098cc
1098cc

Joined: Wed Sep 30, 2015 9:38 am
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Location: Brandy Hill, NSW
If there isn't a stamped number visible is there a physical way of identifying the crown wheel be it 22G940 or 22A411.
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cooperess
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 4:22 pm 
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1098cc
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Location: Brandy Hill, NSW
I've worked it out guys. The 18/62 diameter is less than the 17/62 crown wheel.
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drmini in aust
 Post subject: Re: Crownwheel & Pinion
PostPosted: Tue Feb 27, 2018 6:23 pm 
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:)

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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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cooperess
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 9:25 am 
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1098cc
1098cc

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Location: Brandy Hill, NSW
Moving on.

Which model BMC/Leyland front wheel drive cars used the 18/62 diff ratios?
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drmini in aust
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 9:37 am 
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Location: near Baulkham Hills, NSW
In Australia- 1275 Cooper S, Clubman GT, and most Minis using the rod change box.

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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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Scoop
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 11:34 am 
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998cc
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Joined: Mon Mar 10, 2014 11:38 am
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Location: Tassie
Very common, most of my collection of bits have the 3.44 ratios.

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt
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cooperess
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 11:59 am 
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1098cc
1098cc

Joined: Wed Sep 30, 2015 9:38 am
Posts: 1572
Location: Brandy Hill, NSW
Which model BMC/Leyland front wheel drive cars came out of the factory using the 18/62 diff ratios?
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drmini in aust
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 5:21 pm 
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cooperess wrote:
Which model BMC/Leyland front wheel drive cars came out of the factory using the 18/62 diff ratios?

I answered your question above. Add any Clubman style Mini with a rodchange box including Mini S, Mini SS, 998LS, 1275LS.
Were not used on Morris 1100S cars.

_________________
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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ianscampbell
 Post subject: Re: Crownwheel & Pinion
PostPosted: Sat Mar 03, 2018 5:28 pm 
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848cc
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Joined: Wed Oct 23, 2013 7:10 pm
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Location: Hyde Park, SA.
Just moving on, - I noticed that the crownwheel I refitted this arvo was stamped 18/62 on two sides, so it could be obvious?
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