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graham in aus
 Post subject: Pistons Identification ?
PostPosted: Tue Feb 01, 2011 10:44 pm 
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Are these anything special, RP2266 .040

Top 0025 OB

Repco?

Is it me or should 'top' be on the other side, like front?

This is cylinder No 4:

Image

Any good? 8)

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Goldbrocade_62
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PostPosted: Wed Feb 02, 2011 2:47 pm 
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Can't help you with pistons but this is how the moke project started remember
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graham in aus
 Post subject:
PostPosted: Wed Feb 02, 2011 2:54 pm 
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Yes well?

Not busy are you! :lol:

Probably give you a call........

:lol: 8) :lol: 8)

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TheMiniMan
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PostPosted: Wed Feb 02, 2011 4:09 pm 
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yep, repco

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

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graham in aus
 Post subject:
PostPosted: Wed Feb 02, 2011 5:48 pm 
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Thanks Matt, what about the 'Top' notation?

Can you fit a piston backwards, would it make much difference?

I realise pistons aren't round, but i would have thought the oval was across the pin to help with thrust load?

Hmmmmnnn ?? :?

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SuperCooper
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PostPosted: Wed Feb 02, 2011 6:26 pm 
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Hows the head look?

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Now with 2 extra ports!
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drmini in aust
 Post subject:
PostPosted: Wed Feb 02, 2011 6:36 pm 
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graham in aus wrote:
Thanks Matt, what about the 'Top' notation?

Can you fit a piston backwards, would it make much difference?

I realise pistons aren't round, but i would have thought the oval was across the pin to help with thrust load?

Hmmmmnnn ?? :?

1275 pistons are symmetrical, 1098s are not- they have the gudgeon pin offset.
Sooooooo, watch which way round for these, but on a 1275 it don't matter.

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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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simon k
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PostPosted: Wed Feb 02, 2011 9:34 pm 
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you're not planning on re-using them though are you?
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MiniKit
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PostPosted: Wed Feb 02, 2011 10:24 pm 
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So it's not stating which way up they go..... :lol:

Sorry, I couldn't help myself....
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graham in aus
 Post subject:
PostPosted: Thu Feb 03, 2011 12:51 pm 
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SuperCooper wrote:
Hows the head look?


simon k wrote:
you're not planning on re-using them though are you?


This is one of my spare 9F/XE/Y Motors, bought condition unknown a while ago, the guy said the head had been 'done up' recently. The bores are good, no lip and the head is indeed a very servicable 12G1805 Mk2 S head.

I'm procrastinating about pulling the head on the original Engine in the Mk2, it blows smoke on start up, and I can see oil on top of the pistons. Hoping its just the head :?

But, once the head is off, who knows ! :shock: :lol:

Short term fix would be to just swap the short motors if the bores turn out to be worn in the S. :x

Then theres the diff, a bit of play there too.....Grrrr Bl#ody Mini's :lol:

8)

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simon k
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PostPosted: Thu Feb 03, 2011 8:53 pm 
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graham in aus wrote:
I'm procrastinating about pulling the head on the original Engine in the Mk2, it blows smoke on start up, and I can see oil on top of the pistons. Hoping its just the head :?


it's gotta be just the head, but as soon as you do the head up all the fresh compression will mean it'll blow past the rings :lol:
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