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| Primary Gears https://ausmini.com/forums/viewtopic.php?f=2&t=96320 |
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| Author: | cooperess [ Fri Nov 17, 2017 12:41 pm ] |
| Post subject: | Primary Gears |
Attachment: Mini Primary Gears.jpg Can the primary gear on the right be used in a 1275 Cooper S engine if the bush arrowed on the right is removed? |
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| Author: | timmy201 [ Fri Nov 17, 2017 12:47 pm ] |
| Post subject: | Re: Primary Gears |
If you mill it out to take a 1275 size bush you can. Edit: yours both look to be small bore ones just the left one missing the bearing? The 1275 ones are noticeably thinner on the inside face and have the step Attachment: IMG_4879.JPG Attachment: IMG_4876.JPG
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| Author: | simon k [ Fri Nov 17, 2017 1:42 pm ] |
| Post subject: | Re: Primary Gears |
just to be really clear... don't even THINK about running it without a bush! |
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| Author: | drmini in aust [ Fri Nov 17, 2017 2:22 pm ] |
| Post subject: | Re: Primary Gears |
I have seen what happens.. it wears the shoulder on the 1275 crank down, and the teeth get damaged. The crank then needs the shoulder ground down to 1.500" and a 998/1098 gear fitted instead. Yes it works. A friend and I had some 998 primary gears bored out last year, to fit a 1275 floating front bush. The gears are hard and tough to machine. It cost me $75 per gear for the machining. |
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| Author: | cooperess [ Fri Nov 17, 2017 2:56 pm ] |
| Post subject: | Re: Primary Gears |
timmy201 wrote: Edit: yours both look to be small bore ones just the left one missing the bearing? The 1275 ones are noticeably thinner on the inside face and have the step Attachment: IMG_4879.JPG Does your Cooper S primary gear in picture on the left have a bush installed? So it appears my Cooper S primary gear has no non floating bush. I wonder why! |
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| Author: | timmy201 [ Fri Nov 17, 2017 3:07 pm ] |
| Post subject: | Re: Primary Gears |
Both my photos have a 1275 gear on the left with a bush installed. If you look at the shiny face in the second photo you can tell they are different. Both yours appear from the photos to be small bore ones. Try measuring the inner diameter excluding the bush and see what both yours are. I can measure one of each when I'm home this afternoon (unless you get the answer sooner) |
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| Author: | cooperess [ Fri Nov 17, 2017 4:08 pm ] |
| Post subject: | Re: Primary Gears |
Attachment: Mini Primary Gears 001.jpg Pretty sure the one on the right is Cooper S without a bush and the one on the left is not from the measurements. So now I need a bush I guess. Are they easy to fit?
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| Author: | drmini in aust [ Fri Nov 17, 2017 10:11 pm ] |
| Post subject: | Re: Primary Gears |
Buy the floating 1275 front bush, it slides straight in. I have used a few in my cars. But, if it is sticking out the front at all, get it shortened carefully, but don't squash it out of shape! The original fixed bushes have to be bored to size after fitting. PITA to fit compared to floating one. |
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| Author: | cooperess [ Fri Nov 17, 2017 10:42 pm ] |
| Post subject: | Re: Primary Gears |
Is this the bush I should fit? http://minisport.com.au/mini-1275-fully ... -gear-bush |
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| Author: | drmini in aust [ Sat Nov 18, 2017 5:14 am ] |
| Post subject: | Re: Primary Gears |
Yes. |
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| Author: | cooperess [ Sat Nov 18, 2017 7:17 am ] |
| Post subject: | Re: Primary Gears |
Has anyone had experience using 1275 pre A+ primary gear floating bush and if so please put up your remarks. |
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| Author: | simon k [ Sat Nov 18, 2017 8:28 am ] |
| Post subject: | Re: Primary Gears |
cooperess wrote: Has anyone had experience using 1275 pre A+ primary gear floating bush and if so please put up your remarks. drmini in aust wrote: Buy the floating 1275 front bush, it slides straight in. I have used a few in my cars. I'm using one too, it's fine |
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| Author: | drmini in aust [ Sat Nov 18, 2017 12:23 pm ] |
| Post subject: | Re: Primary Gears |
cooperess wrote: Has anyone had experience using 1275 pre A+ primary gear floating bush and if so please put up your remarks. I have built 4 motors with them, no problems except as said above when fitting, the bush is often slightly too long. It can't stick out at all, or the gear won't run against the bronze thrust washer on the crank. |
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