15 replies to this topic

[edjohnson]

As above really, wondered if anyone could shed any light. Didnt think that the cossie motor was a modded a series, but read something somewhere that led me to believe otherwise.

Cant remember where though, and my old man dont think so either.

Antone know anything?

ed

[Sprocket]

Didnt the original KAD 16valve head use BDA cams?????

The only other thing i can think is that the BDA was originaly developped from a push rod block?????, much similar to the A series with the cam driving the valves with rockers, push rods, cam followers and oil pump again in a similar way. The overhead cam BDA uses a jack shaft to drive the oil pump, this jack shaft would originaly have been the cam. its still needed to drive the oil pump. A series 16valve engines use this jackshaft also to still drive the oil pump.

Other than that, the two engines atr totaly different. The only similarities are that they share common engineering practicies.

Just seems a bit daft that when designing an overhead cam engine that they would use a seperate shaft right the way through the engine to drive the oil pump. You would put the pump at the belt drive end, or run it direct of the crank. The BDA must have been a pushrod engine at some point.

[Sprocket]

OK here we go, a little research.

The Ford Kent engine was originaly a three bearing crank over head valve engine with a capacity of 997cc, 1200cc 1340cc, both inlet and exhaust were on the same side of the head. Similarities to the A series???? it was then developed through 1340cc to 1500cc and a five bearing crank. Lotus developed this engine into a twin over head cam and 1558cc

The Kent was then further developed using a Crossflow head design, hence its new nick name, 'Crossflow'

Cosworth increased its association with Ford in 1969 by developing a DOHC 16-valve four cylinder engine for road use in the Escort. Working from the Kent block, Cosworth created a 1601 cc engine for homologation purposes. The camshafts were driven by a toothed belt, hence the name BDA (Belt Drive A). Running in Group 2 and Group 4 on either rallying or touring car racing, this engine could be enlarged to a maximum of 2.0 L.

So i was right about the push rods

[mini23]

Nice bit of research!

I'm sure years ago lotus heads were fitted to a series by some tuners, and they looked so good.

[Sprocket]

Never!


Bore spacing is all wrong

Are you not getting confused with the B series engines fitted to the MG's

The first A series twin cam was the Weslake back in 1988, now known as KAD

Austin rover did research on single overhead cams and had prototypes made, only two survive that is known of.

[v8mini]

there used to be a conversion for the BDA / lotus twin cam engine on the mini gearbox, dont think they did just the heads though.

old thread about them here http://www.theminifo...x...=9685&st=60

Edited by v8mini, 31 January 2007 - 11:51 PM.

[JetBLICK]

Are you getting confused with the old trick of fitting a 1700 crossflow on an a-series gearbox?? I'd only ever seen the conversion parts before, until i actually saw one on an autojumble at bingly at the weekend!! sounds tempting, but then it wouldn't be a mini

[mini13]

the crossflow indeed was the fore runner to the BDA and i belive the block is interchangable,

the lotus twincam egine was also a crosflow with a different head this time being an 8 valve head.

the Crossflow and its BDA and lotus twincam derivitives have ALL been grafted onto a mini gearbox (the same operation for all)

Some one wrote that most modern 16v heads are basicaly the same as the BDA head (there have been more original head designs in the last 10 years or so though) and th KAD head is certainly a BDA head scaled down to fit the A series, as a result it uses, or at least used the BDA cam profiles.

[edjohnson]

the lotus twin cam was a pre crossflow pushrod block, with the oil pump run off the old cam, and an over head, twin cam, 8 valve head fitted. The twin cams were used to optimise valve angle, not to use 16v.

The crossflow is a later ford block, im pretty sure the lotus engine was the earlier one. THe blocks may well be similar though.

my old man has the lotus engine in his escort with big valve head, and quite lairy cams, with twin webbers, but he wont let me put it in my mini, (he never uses the escort anymore) as id heard about the mini lotus conversion plates

so i was wondering if the bda was anything like the a series. sounds like the bda and lotus are the same block then.

fun!!!

[Guess-Works.com]

If y'all had been looking carefully, and as Jetblack has rightly pointed out... you would have seen the said item, 1700 xflow on a modified Mini gearbox at Bingley... T'was on Scurvey_dogs Auto jumble stand, and could have been yours for 650

I believe there was one done for the BDA aswell, not that the block is much different from the crossflow.

[The Matt]

If y'all had been looking carefully, and as Jetblack has rightly pointed out... you would have seen the said item, 1700 xflow on a modified Mini gearbox at Bingley... T'was on Scurvey_dogs Auto jumble stand, and could have been yours for 650

I believe there was one done for the BDA aswell, not that the block is much different from the crossflow.

Man, I must be blind! I wanted to have a close up look at that kit!

[who_loves_the_mini?]

anyone know when scurvy dog will be back around? i want to ask him a couple of questions about the conversion

[Sprocket]

http://www.wilcoxeng...n.co.uk/bda.htm

http://www.wilcoxeng....uk/twincam.htm

http://www.wilcoxeng...co.uk/xflow.htm



All VERY similar

[Retro_10s]

The Ford 'Endura' series was virtually identical to the A-series IIRC from college...

[Sam]

The Ford 'Endura' series was virtually identical to the A-series IIRC from college...

not really, the endura is the old crossflow engine