ADO16 1275 Engines

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Supersonic
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Re: ADO16 1275 Engines

Post by Supersonic »

NZmember wrote:Alan
You mention the use of 'S type block with the AEG479 EN40B nitrided crankshaft' but what about the AEG577 crank in the MG1300? I posted a question years ago as someone in NZ was selling a solid wall short motor that he reckoned had an EN40B crank. From the pictures I found the crank had the number AEG577 cast onto it.


viewtopic.php?f=3&t=5769&p=40329#p40329
Thank you for your interest in this thread. Over 40 years I've seen a good number of ADO16 engines dismantled and noted everything which I still have to this day. The crankshafts I found in upmarket ADO16 1275 engines were:-

AEG479 EN40B (in the very first 1275 cars with the Cooper S block)
AEG480 EN40B (as above)
12G1287 EN16T with 1.625" diameter big ends
12G1288 EN16T with 1.625" diameter big engs
12G1683 EN16T with 1.75" diameter big ends (this is the tuftrided crank found in the MG, Riley Kestrel and Austin / Morris 1300 GT)
12G1505 EN16T with 1.75" diameter big ends (this was in the standard 1300 engines)

I've seen a AEG577 crank at my friend's garage and assumed it was Mini Cooper S?

If you find out anything further on this crank AEG 577 would appreciate knowing as we are trying to research all engines fitted to the ADO16 cars.

Alan
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dodge44
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Re: ADO16 1275 Engines

Post by dodge44 »

I know it's an added complication Alan but it would also be interesting to know while we're here when the first 4-synchro gearboxes (using 22G846 case casting as per Elf/Hornet) started to creep into the ADO16 supply chain as there may be some correlation with the early 1275 MK1's? It seems to have taken some time as Vizzard quotes October 1966 for the first production 4-synchro examples but September 1968 for full introduction across the ranges - by which time I'm guessing case casting number 22G1128 was universal.

Roger
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Costafortune
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Re: ADO16 1275 Engines

Post by Costafortune »

Given that early Mini and 1100/1300 Mark II's were 3 synchro, it's very unlikely that anything in '66 was 4 synchro.
Supersonic
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Re: ADO16 1275 Engines

Post by Supersonic »

Costafortune wrote:Given that early Mini and 1100/1300 Mark II's were 3 synchro, it's very unlikely that anything in '66 was 4 synchro.

Costa and Roger thanks for your input much appreciated.

If it helps the early ADO16s with the Cooper S block that I've seen had the 22G68 3-speed synchro gearbox. The first 4-speed synchro gearbox I seen in a 12G engine car was the 22G846 and that was in a mid 1967 car.

Alan
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Costafortune
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Re: ADO16 1275 Engines

Post by Costafortune »

The S had a four synchro box before the rest of the BMC FWD range - regular stuff (Mini 1000, 1300 etc) didn't get it until early 1968.
Turbo88
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Re: ADO16 1275 Engines

Post by Turbo88 »

interesting subject folks 8-)
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spoon.450
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Re: ADO16 1275 Engines

Post by spoon.450 »

Supersonic wrote: Sat Mar 11, 2017 11:27 am
NZmember wrote:Alan
You mention the use of 'S type block with the AEG479 EN40B nitrided crankshaft' but what about the AEG577 crank in the MG1300? I posted a question years ago as someone in NZ was selling a solid wall short motor that he reckoned had an EN40B crank. From the pictures I found the crank had the number AEG577 cast onto it.


http://mk1-forum.net/viewtopic.php?f=3& ... 329#p40329
Thank you for your interest in this thread. Over 40 years I've seen a good number of ADO16 engines dismantled and noted everything which I still have to this day. The crankshafts I found in upmarket ADO16 1275 engines were:-

AEG479 EN40B (in the very first 1275 cars with the Cooper S block)
AEG480 EN40B (as above)
12G1287 EN16T with 1.625" diameter big ends
12G1288 EN16T with 1.625" diameter big engs
12G1683 EN16T with 1.75" diameter big ends (this is the tuftrided crank found in the MG, Riley Kestrel and Austin / Morris 1300 GT)
12G1505 EN16T with 1.75" diameter big ends (this was in the standard 1300 engines)

I've seen a AEG577 crank at my friend's garage and assumed it was Mini Cooper S?

If you find out anything further on this crank AEG 577 would appreciate knowing as we are trying to research all engines fitted to the ADO16 cars.

Alan
I've just stripped an engine that was built over 20 years ago. It's a metro turbo A plus block so was expecting to find A plus crank and rods, but to my surprise found AEG577 crank ( in mint condition on std / std ) and 521 rods. The thrust width of the crank is the same as GT / A plus cranks. The engine was previously owned / built by someone who used to compete in the late 60's, early 70's. It's cross drilled and by the colour, looks nitrided.
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