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New engine blocks
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- Minor Legend
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New engine blocks
New 5-main blocks being made. A lot of work and a lot of expense, I guess.
Cardiff, UK
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- Minor Maniac
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Re: New engine blocks
Rob
Any more information?
By the time the crankshaft and con rods (and possibly a new head to suit) are made it will be very expensive.
Nissan made the 'A' Series engine under licence - one of the many changes made was to including a five bearing crankshaft arrangement.
https://en.wikipedia.org/wiki/BMC_A-series_engine
https://en.wikipedia.org/wiki/Nissan_A_engine
Nice idea but a well put together three bearing 'A' Series can rev and will rev without crankshaft whip up to very high revs with reliability included.
Phil
Any more information?
By the time the crankshaft and con rods (and possibly a new head to suit) are made it will be very expensive.
Nissan made the 'A' Series engine under licence - one of the many changes made was to including a five bearing crankshaft arrangement.
https://en.wikipedia.org/wiki/BMC_A-series_engine
https://en.wikipedia.org/wiki/Nissan_A_engine
Nice idea but a well put together three bearing 'A' Series can rev and will rev without crankshaft whip up to very high revs with reliability included.
Phil
- twincamman
- Minor Fan
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Re: New engine blocks
The short length of the 'A' series compared to other engines of its era, coupled with a pretty stout crank by small car standards will make it less prone to crank whip than most three bearing engines. If you wanted to go extreme in the hp stakes (say 150+ bhp) then you'd probably be better off investing in a strap for the centre main bearing as a precaution.
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- Minor Maniac
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Re: New engine blocks
I would suggest that strapping the centre main should only be carried out on engines up to 100bhp - after that a steel 4 bolt centre main cap as fitted to my 1380cc 140bhp Minor should be used or even better have all three main caps machined out of steel.
Before I put the rev limiter on the engine I would regularly see 10,000 rpm recorded on the rev counter - the engine is fully balanced and that does cut down the engine vibration frequency.
Here is a centre main strap currently for sale on 'e' bay:-
https://www.ebay.co.uk/itm/Classic-Mini ... Sw0ohdKij3
My 1400cc Midget block (currently dismantled) is fitted with a centre main strap and I have just purchased a centre main strap for the 998cc (948cc) engine being rebuilt in slow time.
Before I put the rev limiter on the engine I would regularly see 10,000 rpm recorded on the rev counter - the engine is fully balanced and that does cut down the engine vibration frequency.
Here is a centre main strap currently for sale on 'e' bay:-
https://www.ebay.co.uk/itm/Classic-Mini ... Sw0ohdKij3
My 1400cc Midget block (currently dismantled) is fitted with a centre main strap and I have just purchased a centre main strap for the 998cc (948cc) engine being rebuilt in slow time.
Re: New engine blocks
Which foundry is doing the casting———- or is it something you’ve just heard about?
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- Minor Addict
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Re: New engine blocks
Austin did a similar thing with the "Seven" engine, ie added a third bearing to the two bearing engine.
It made it even worse, the centre bearing would wear and allow the crank to flex, but the space for that centre bearing had to come from somewhere, that somewhere was the crank webs were made thinner.......The result was even more broken cranks.
A good three bearing Austin engine is very smooth..........But for how long ?
I reckon this five bearing A series could have similar problems which might outweigh any advantages.
Phil
It made it even worse, the centre bearing would wear and allow the crank to flex, but the space for that centre bearing had to come from somewhere, that somewhere was the crank webs were made thinner.......The result was even more broken cranks.
A good three bearing Austin engine is very smooth..........But for how long ?
I reckon this five bearing A series could have similar problems which might outweigh any advantages.
Phil
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- Minor Fan
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Re: New engine blocks
It’s nothing more than a cad drawing at the moment, I’d be surprised if it’s ever available to buy. If you’re going to make an A series block, surely you’d start with the transverse variant?