it is an S engine - there is a side cover breather on it.... look where the vacuum advance hose goes... and obviously a 1275 because it's got a large gap (and extra stud) beside the thermostat housing

the car number is about 200 under mine, so the engine number should be around 55460 - doesn't marry up with the 5521 they've got on there

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did I tell you that I won a trophy?

I wonder if the breather comes off the timing chain cover and not the side plate? (that could explain something else!)

wooo, touche.... though it does curve towards the back of the engine, on the inside of the heater hose

so what's this other thing?

are you curious about the way there are holes in the engine number platform, instead of the remainders of the scrivets that were chiselled off at the factory??

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did I tell you that I won a trophy?

All of my engines have either very clean holes or holes with scrivets chiseled off. Even if the scrivet is removed completely it will leave a bit of a burred thread in the block.

I'm a bit closer. My car is 50 before this one which would seem to be correct as mine is a 5/70. Going by my engine number, I would have said it should be around 53050-53100 range, but who knows. I would agree, its missing a number and its been restamped.

Can anyone make head or tale of the welsh plug in the front of the block, I can't decide if it is the bigger or smaller type. It looks like the bigger s type to me...

The 1300 type are conspicuously smaller.

Nothing a well placed question won't help...

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Yeah I can see it now,
I asked this on another thread but do MKII S engines all have tappet chest covers and do they have their breather off them

The Mk2 S still has the tappet covers and the breather.

OK thanks next question is did some MK2s have thin flange blocks and some thick ?

The Mk2 has a thick flange, but they very first ones didn't as they were using up remaining stock. (I think)

TME current issue 14, p61, says there was the odd early Mk2 with a Mk1 thin flange block, according to John Smidt at Mini King.

But by 1970 they would be long gone.

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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.

Woo Hoo, the first confirmation that my Cooper S production list has its uses.

YG2S4 2064 is already on the list.

Apparently (and there is of course no guarantee that all the information is 100% accurate) the engine number should be 9F/XE/Y 55521.

I would say that the number has been restamped after having some work (or possibly that the engine has been replaced and the original engine number used) and that it has been a mistake by putting double-5 instead of tripple-5.



Don't forget that there is no sequence of engine numbers in relation to chassis numbers.

For example, chassis number 2014 had engine number 53002; chassis number 2058 had engine number 58514; chassis number 2064 had engine 55521; chassis 2099 had engine 55527.

Or how about this: Engine number 56284 was in chassis number 2878, while engine 56285 was in chassis 2861.

I really need to get a life!

Cheers,
Watto

Now I'm confused. I had always assumed that my S (chassis 2014 engine number 53002) was correct because that was the engine number on the rego label (Car was bought with 1100S motor in it.) It appears that it may not be the correct engine, as the good Doc has pointed out, I've got a thin flange block in a 5/70 build. I bought the car in 92 and don't know its previous history, so I would suggest its probably had an engine change at some stage of its life. I spent considerable time tracking down the "original" engine, eventually finding it under someones bench. Now I'm depressed.

WHile I can't say anything for Cooper S engine numbers , I've found with 850 engine numbers they often got them from the "wrong shed" and the Australian and UK produced engine numbers jumped forward or jumped backwards by anywhere up to 6,000 numbers or ran backwards altogether for 20,000 numbers . Not to mention 5,000 units of body numbers would cover 15,000 units of engine numbers as motors were taken from the line for waranty or whatever .

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Did ALL Ss have side(back?) plates on the block???

Should be a giveaway.

Cheers, Ian