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 Post subject: 1100 S Crank End Float
PostPosted: Sun Apr 07, 2019 9:46 pm 
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998cc
998cc

Joined: Sun Nov 06, 2005 5:41 pm
Posts: 844
Location: Adelaide
I am setting up the end float on a thin flange 1100 S 1275, with what appears to be the original small journal crank.
With new thrusts, the end float is only about 1 thou. I am aiming for 6.

The standard thrusts appear to be too thick.

I did the same exercise on a spare 1100 S motor - same problem, I can only just get the thrusts in.

Unfortunately I don't have the original thrusts for comparison.

Were the original 1100 S thrusts the same as the std 1275 ones sold today, or were they a few thou less?

I am happy to machine the thrusts, but I would like to know why this has come about.

Any ideas much appreciated.


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PostPosted: Mon Apr 08, 2019 7:02 am 
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39621
Location: near Baulkham Hills, NSW
Yes the ACL ones are often a bit too thick. You can sand the steel side down on a surface plate and some 180 wet and dry paper, I use WD 40 to lube it.
If you are going to rev it over 6500 you want 5 or 6 thou end float.
Get them surface ground on the steel side, it's quicker.

The manual says 3 thou end float, I found it's not enough unless it's a bog stock road motor. The crank webs will grab the thrust washers at high rpm and overheat the centre main. I then had to get a crank reground.

_________________
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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PostPosted: Tue Apr 09, 2019 8:06 pm 
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998cc
998cc

Joined: Sun Nov 06, 2005 5:41 pm
Posts: 844
Location: Adelaide
drmini, thanks for your comment.
The new thrusts are ACL, so I will have them skimmed.


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