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suffolk
 Post subject: mk1 's' motor question
PostPosted: Mon Jul 02, 2007 10:13 am 
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848cc
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Joined: Sun Jan 07, 2007 3:22 pm
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Location: narrogin w.a
Done a few searches on here couldn't find anything so,,Does anyone know the casting number on 1275 mk1 cooper s block?? And what part number would be on the main bearing caps .eg. AEG??? cheers
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wild_willy
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PostPosted: Mon Jul 02, 2007 11:38 am 
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998cc
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Mk 1 "S" block part number AEG312. Main bearing caps - no cast part No. But should have stamped 4 digit number that corresponds to the number stamped on the block (generally on the front of the block next to the water pump).
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sports850
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PostPosted: Mon Jul 02, 2007 11:47 am 
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Is this still the motor you were asking about before that's an unknown quantity , does it have caps with it ? The caps are matched to the block and other caps will require tunnel boring to match which is an extra expense if not there , something to keep in mind .

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drmini in aust
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PostPosted: Mon Jul 02, 2007 11:51 am 
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Pretty sure all S blocks Mk1 and 2 have that same casting number on. All or most Mk1s were thin flange though I think.
Thick flange block is more rigid.

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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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suffolk
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PostPosted: Mon Jul 02, 2007 11:51 am 
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848cc
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Location: narrogin w.a
No i'm off to have a look at another block on wednesday,,,he reckons its a thick flanged with 9fsay,, which i don't think exists,,,bit of luck it might be a mk2 with mk1 restamp on it, I know a thick flange is about 15mm ,,,How thick would a thin flange be?
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drmini in aust
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PostPosted: Mon Jul 02, 2007 11:53 am 
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about 6mm give or take. :wink:

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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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suffolk
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PostPosted: Mon Jul 02, 2007 11:56 am 
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848cc
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Location: narrogin w.a
Thanks alot people, very helpful,,now i know what to look for....cheers
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suffolk
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PostPosted: Mon Jul 02, 2007 12:01 pm 
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848cc
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Location: narrogin w.a
I just thought i'd add mr vizards book says thin flanged blocks can flex and cause oil leaks, that would have to be a pretty powerfull motor wouldn't it? Does putting the bigger bolts in the thin flange help this...anyone had this problem or is it bit of a myth...
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drmini in aust
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PostPosted: Mon Jul 02, 2007 1:49 pm 
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I've had a couple of Mk1 S thin flanged road motors, the 1st had standard 1/4" bolts and the 2nd had 5/16". Neither leaked oilz.
I think it matters more on competition motors. :wink:

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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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wild_willy
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PostPosted: Mon Jul 02, 2007 4:33 pm 
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998cc
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Used thin flanged Mk1 blocks in my J car. Never had any dramas with oil leaks except when a cam follower let go at 8000rpm. Punched holes in front and back of block - oo ah!!!!
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suffolk
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PostPosted: Mon Jul 02, 2007 4:50 pm 
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848cc
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Location: narrogin w.a
ouch!! that would of hurt the poor girl pretty bad :cry:
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AJ
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PostPosted: Mon Jul 02, 2007 7:45 pm 
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AEG 312 is the Mk1 casting number

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