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970 Cooper S engine
https://www.ausmini.com/forums/viewtopic.php?f=2&t=5358		 Page 1 of 2
Author:  doogie [ Mon Mar 07, 2005 7:01 pm ]
Post subject:  970 Cooper S engine
Hey people, just wanting to know what parts are reqired to convert a S motor to a 970, is it just changing the conrods???? I belive the 970 rods are a AEG 177 parts no, i have 3 of them, no idea were the fourth on is. Is this all i need or do i need a different crank aswell? Any advice is welcome


Doogie
Author:  kazjim [ Mon Mar 07, 2005 7:19 pm ]
Post subject: 
PM Graham_in_Aus .. he's the resident Brit-spec Cooper guru ....
he's especially find of the "little coopers" (997, 998) so he may shed some light on it
J
Author:  drmini in aust [ Mon Mar 07, 2005 7:20 pm ]
Post subject: 
Doogie,
You need the rods, a 970S crank (~60mm stroke) and deck a 1275S block about 3/8" I think. Use an S block, as the deck is thicker than all the others. :wink:
Author:  Mini Mad [ Mon Mar 07, 2005 7:24 pm ]
Post subject: 
These are the specs, jims right Graham is the man on these things...

Specs indicate that it's just a shortened stroke we're looking at here:

970 S Bore/Stroke: 70.61mm x 62mm

1275S Bore/Stroke:70.61mm x 81.3mm

You may also need to change the crank..I'm a fan of the little high revving 970S 8)

<edit> Doc cleared that right up :) I would be guessing that a 970 S crank would be as rare as rocking horse doo doo.. :shock:
Author:  doogie [ Mon Mar 07, 2005 7:25 pm ]
Post subject: 
What part no/castings on a 970 crank?

Doogie
Author:  drmini in aust [ Mon Mar 07, 2005 7:29 pm ]
Post subject: 
Ivan (Mini Spares & Repairs) owns a 970S.

I think you will find 970S cranks pretty scarce. Not many were made.

BTW Josh, they have bugger-all torque... you have to rev the nuts off 'em to get anywhere! :lol:
Sorta like an 850 with more HP. (62, I think) :wink:
Author:  doogie [ Mon Mar 07, 2005 7:33 pm ]
Post subject: 
Only $2500 new from the UK for a crank, yay this may take some convincing of my wife!!!!
Author:  Mini Mad [ Mon Mar 07, 2005 7:35 pm ]
Post subject: 
Hehe, i'd be happy just revving it's nuts off :mrgreen: who cares where i'm going 10,000 rpm here i come....that might be pushing it though..at least 9 ;)

That'll be about the same power as my 1152? or slower with the loss in torque?
Author:  kazjim [ Mon Mar 07, 2005 7:36 pm ]
Post subject: 
Could you Destroke a 1275"S" ?
3/8 is an AWFUL lot of stroke change, but you could have the crankpins welded and re-ground on a smaller base circle..... be less than $2500 I'm sure.....

J
Author:  kazjim [ Mon Mar 07, 2005 7:37 pm ]
Post subject: 
Josh, Torque wins on the track...
HP wins at the Bar ......

J
Author:  drmini in aust [ Mon Mar 07, 2005 7:38 pm ]
Post subject: 
Josh, I think your 1152 would have way more than 62 HP now, and it's definitely more torquey than a 970 would be.. :wink:

Just remember- HP= torque x RPM.... 8)
Author:  Mini Mad [ Mon Mar 07, 2005 7:38 pm ]
Post subject: 
yea probably aren't too many people in the 'destroking' game..i'm sure there are alot of requests :roll: :wink:
Author:  Mini Mad [ Mon Mar 07, 2005 7:44 pm ]
Post subject: 
damn you lot, look how many replies got in as i was typing :shock:

yea, i didn't say i was going to get one..but i still want one (no not a HSV either).. :mrgreen:
Author:  kazjim [ Mon Mar 07, 2005 7:47 pm ]
Post subject: 
Crazy as it sounds, i actually thought of de-stroking a 998 Crank....
find some rods of the approximate dimensions from a motorbike, a small, light set of kawasaki or honda pistons..... 11,000RPM and 16Psi.... hmmmm
But the thought of having a mini flywheel / clutch spinning at that speed scared me !! :shock: :shock: :shock:
J
Author:  drmini in aust [ Mon Mar 07, 2005 7:51 pm ]
Post subject: 
I've got a nice Hillman Imp crank sitting here, ~60mm stroke, might be a bit long end to end though. But it'd never break.. :wink:
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