Yes and those are EN16, tuftrided. Same crank type was in the small journal Morris 1100S donk. Good crank, for street or track.

Rumour has it the old EN40B ones are too brittle now for racing use, but they make fine street cranks. I concur...

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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.

EN40B is the grade of steel isn't it?

yes, there is also a number stamped on the web. Mine says AEG479.

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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.

don't forget early 1275 'S' cranks that were made out of the good stuff (weren't identified as en40b). Earliest of these cranks not cross drilled latter were.

I never checked to see what type of EN40B mine was, just that it was. Mini King did the rebuild and everything. 'Twas the original motor from their Cooper S that burnt in their fire (motor was out of the car at the time, luckily).

Mine is numbered in the low 47000s, which, according to what I've read on some mini engine number websites, should be cross-drilled. Sounds cool, but is it really that good? Vizard likes it, but many UK mini forums say they are bad, but equal amounts of people say they are good.... so confusing....

Opinions?

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Crossdrilled is good if you're going to rev it. I've never seen a 1275 S crank that wasn't crossdrilled but yes they exist.
S cranks are great on the road, unlike the soft old EN16 big journal ones, they don't wear. Mine is in its 4th block now, it's still .010/.010 size.

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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.

Oh, and Doc, yes, I do rev it. When the boost is up, so to is the revs.....

Vizard LOVES the S motor, in How To Modify Your Mini, appart from the early heads.

He just keeps talking up certain parts of it.

1275 S, over engineered perhaps?

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1964 Morris 850, 1330 Supercharged - 81.8hp atws.
1975 Leyland Mini S 1100S powered - Nice and reliable.
1977 Leyland Mini LS - Project LS-T

Cooper S 1071, 1275 and 970 motors were developed from John Cooper's 1100cc Formula Junior race motors.
The S was designed to compete, and last, and win.
When you consider its grandfather, the old Austin A30 (803cc) motor had around 21HP or so it's amazing the power that the Cooper S had, and even more so what can be got from a 1275 race motor now.

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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.

What is even more amazing is the poor old mini gearbox can take the power of a 1275 race motor, or not, as I found out last weekend at Morgan Park, first meeting of freshly rebuilt 1293, ripped ALL the teeth off 3rd gear!! It happened on the last gear change of my last run for the weekend, right before the finish line, no drive, mucked up my time Not happy Jan

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Steve

Bugger....
Was this a SCCR gearset, and how old if so?

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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.

Was SCCR, had done 4 seasons of sprints & hillclimbs. Believe one or more teeth broke on the 3rd speed gear which then jammed between the cluster ripping all the teeth off the cluster. Windage tray prevented crap going everywhere up top but the engine will receive a complete strip down. This is the motor I ran in in the Black S, it ran beautifully and very strong all weekend, bettered my best time on that circuit by some 8 seconds, 3.09.50 to 3.01.80 and that new time was the run when the gearbox broke

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Steve

http://cgi.ebay.com.au/ws/eBayISAPI.dll ... :IT&ih=020

I'll try sell mine again

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Miniworx Centre 0883741299
Sooperdooperminicooperexpertengineering
Online BMW Mini Shop

Sorry to drag this up again, just took my 1275 Cooper S engine a part, has all the correct bits but there the numbers on the crank are GE622 and partial 12g15 the ge622 is stamped and the 12g15 is cast.

also the pistons have aeg034120 w22 stamped on them..

ps head is aeg163, gear box is close ratio, s rods

question, are the pistons standard and the crank is what S, 1300gt

Thanks

Kiwiinwgtn

If the crank has 12G15 visible it was probably a 12G1505 big journal forging, then ground down to fit S rods.
When doing this it's common to stroke the crank to 84mm approx. Or if it's a race motor, to destroke it- so you can use bigger pistons and still stay under 1300cc class limit.

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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.

very strange

also the crank is a dark grey colour if that makes sense..

what is the significance of the GE622 numbers which are stamped on the crank web

Every thing else is with out a doubt cooper S, rods, back plate, damper, also box is close ratio, hard spicer ..

any one reconise the piston numbers,