1098 Crankshaft

[diz]

Are all 1098 crankshafts the same spec? - I’m thinking of fitting a 1098 crank (and pistons) to a 998 block and want to make sure I get the right one.

Appreciate any info.

Thank you, Diz

[Costafortune]

Pretty much yes. Pre 65 had a thin tail for the small primary gear but anything since the dawn of time (or the Allegro) will be the same. There wasn't an A+ 1098 either.

[bwaminispeed]

The ones in the MG 1100 were EN16 spec, and, crossdrilled..........

[Spider]

There wasn't an A+ 1098 either.

For a brief (and perhaps, obscure) period there was an A+ 1100, in 79 and 80.

[bwaminispeed]

I think the late production Clubman GTs had those motors.....

[diz]

Many thanks for the information.

I suspect availability will determine what I end up using but to help me can you advise what regrind size is acceptable before strength is unduly compromised?

The engine will be for road use only and I intend to build with flat top pistons, 295 head, SW5 cam and HIF38 carb.

Thanks, Diz

[Costafortune]

The ones in the MG 1100 were EN16 spec, and, crossdrilled..........

Any evidence of that? Part numbers as opposed to heresay.

[Costafortune]

There wasn't an A+ 1098 either.

For a brief (and perhaps, obscure) period there was an A+ 1100, in 79 and 80.

I doubt that. I used to service a 1981 Allegro 1100 on an W plate that was most definitely an A Series. These were replaced early '81 by a 998 A+

The A+ was completely different. Everything was changed. BL would not have spent money making an engine they were not fitting to any production cars.
The first car to use an A+ engine was the Morris Ital in mid 1980. The A+ block was however trialled in a handful of cars in 1979-80 including some 998's and therefore very possibly 1100's. They are not A+ engines however.

[Costafortune]

I think the late production Clubman GTs had those motors.....

You think wrong. The 1275GT used an A Series 1275 to the very end.

[850man]

There wasn't an A+ 1098 either.

For a brief (and perhaps, obscure) period there was an A+ 1100, in 79 and 80.

Any evidence of that? Part numbers as opposed to hearsay.

[Costafortune]

See my post above!

[Costafortune]

Many thanks for the information.

I suspect availability will determine what I end up using but to help me can you advise what regrind size is acceptable before strength is unduly compromised?

The engine will be for road use only and I intend to build with flat top pistons, 295 head, SW5 cam and HIF38 carb.

Thanks, Diz

10 thou really. Tim at Minimail had a few new ones in grease paper but that was several years ago.

It's a nice conversion and you can run a decently tall final drive such as a 3.1 or 3.2 with ease.

[LuisM]

Code: Select all

For a brief (and perhaps, obscure) period there was an A+ 1100, in 79 and 80.

a friend here bought a lot of parts from UK long time back and there was a 1100 A+ block engine with 10H engine number tag .
Of course tag might had been changed... by the time he was told the engine came from a 1100 Special.

just did a quick search... and there is one 1100 Special advert, low mileage... with A+ block. No clue how genuine this engine/car is.
Nice car BTW.

https://car-from-uk.com/sale.php?id=54323

Cheers
Luis

[Supersonic]

The ones in the MG 1100 were EN16 spec, and, crossdrilled..........

You are correct, up to 1965 the 1098cc MG 1100 had an EN16T cross-drilled crankshaft. They lost it when the Riley Kestrel and Wolseley 1100 came out in late 1965 and all used the standard 1098cc crankshaft. I've never seen an early MG 1098cc engine without the cross-drilled crank. The parts number are in the book "Anatomy of the Classic Mini"

Alan

[Supersonic]

Code: Select all

For a brief (and perhaps, obscure) period there was an A+ 1100, in 79 and 80.

a friend here bought a lot of parts from UK long time back and there was a 1100 A+ block engine with 10H engine number tag .
Of course tag might had been changed... by the time he was told the engine came from a 1100 Special.

just did a quick search... and there is one 1100 Special advert, low mileage... with A+ block. No clue how genuine this engine/car is.
Nice car BTW.

https://car-from-uk.com/sale.php?id=54323

Cheers
Luis

I've a friend who bought a Mini 25 Special from the Patrick Collection and I replaced the clutch in it the other week. I'm sure it is totally original and it has 22G1832 gearbox and pre-verto clutch assembly. It is 1979 built and has a 1098cc A+ engine which was a surprise to me.

Alan

[Supersonic]

I’ve always maintained there is no logic to what you find in BLMC / BL timelines. As I said above that original 1979 Mini Special has the 1098cc A+ engine and earlier running gear. I also work on a very original 1980 1098cc Mini Clubman and it has the Pre A+ motor from new. The Clubman is 14 months younger than the Mini Special and this just goes to prove the point.

Alan

[OzOAP]

I think the late production Clubman GTs had those motors.....

You think wrong. The 1275GT used an A Series 1275 to the very end.

My 1980 GT was A+ engine and gearbox, 1040 laygear. I got car from original owner in '85, it had not had an engine swap.

[diz]

by Costafortune » Tue Dec 01, 2020 9:01 am

Tim at Minimail had a few new ones in grease paper but that was several years ago.

Thank you. I'll contact Tim and also post an ad in the wanted section to see if anyone can help

[Costafortune]

Blimey - learning some stuff today!

[Costafortune]

I think the late production Clubman GTs had those motors.....

You think wrong. The 1275GT used an A Series 1275 to the very end.

My 1980 GT was A+ engine and gearbox, 1040 laygear. I got car from original owner in '85, it had not had an engine swap.

Sorry, I meant they didn't have 1100 engines as was suggested. The A+ seemed to go into series production around May/June 1980