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doogie
 Post subject: 970 Cooper S engine
PostPosted: Mon Mar 07, 2005 7:01 pm 
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High heel ninja
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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


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kazjim
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PostPosted: Mon Mar 07, 2005 7:19 pm 
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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

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drmini in aust
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PostPosted: Mon Mar 07, 2005 7:20 pm 
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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:

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Mini Mad
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PostPosted: Mon Mar 07, 2005 7:24 pm 
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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:

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Last edited by Mini Mad on Mon Mar 07, 2005 7:26 pm, edited 1 time in total.

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doogie
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PostPosted: Mon Mar 07, 2005 7:25 pm 
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What part no/castings on a 970 crank?

Doogie

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drmini in aust
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PostPosted: Mon Mar 07, 2005 7:29 pm 
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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:

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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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doogie
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PostPosted: Mon Mar 07, 2005 7:33 pm 
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Only $2500 new from the UK for a crank, yay this may take some convincing of my wife!!!!

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Mini Mad
 Post subject:
PostPosted: Mon Mar 07, 2005 7:35 pm 
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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?

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kazjim
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PostPosted: Mon Mar 07, 2005 7:36 pm 
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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

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kazjim
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PostPosted: Mon Mar 07, 2005 7:37 pm 
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Josh, Torque wins on the track...
HP wins at the Bar ......

J

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drmini in aust
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PostPosted: Mon Mar 07, 2005 7:38 pm 
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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)

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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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Mini Mad
 Post subject:
PostPosted: Mon Mar 07, 2005 7:38 pm 
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yea probably aren't too many people in the 'destroking' game..i'm sure there are alot of requests :roll: :wink:

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Mini Mad
 Post subject:
PostPosted: Mon Mar 07, 2005 7:44 pm 
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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:

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kazjim
 Post subject:
PostPosted: Mon Mar 07, 2005 7:47 pm 
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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

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drmini in aust
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PostPosted: Mon Mar 07, 2005 7:51 pm 
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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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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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