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A series MG 1275 engine rotation
donut - 9/11/07 at 11:40 AM

Does anyone know if the rotation of an A series MG Midget/Marina engine is the same as ford?

I ask as one idea i had was to use an A series 1275 engine and plop a turbo on it from an MG Metro. Not great power but i'm not after performance.

Peteff - 9/11/07 at 11:43 AM

Same as crossflow and pinto

coozer - 9/11/07 at 11:53 AM

Yep clockwise, I remember having to turn the starting handle... Oops!

donut - 9/11/07 at 12:13 PM



Cool, cheers chaps.

02GF74 - 9/11/07 at 12:49 PM

most likely be same as B-sereis and that went clockwise when veiw standing in front.

in fact you cab bet all engines do this apart from some Honda ones.

BTW you may need to lower CR but A-series are quite low anyway, well, comapred to modern engines. new pistons, thicker head gasket, enlarge combustion chamber

[Edited on 9/11/07 by 02GF74]

iank - 9/11/07 at 01:04 PM

Lots of information on turbo'ing the A series here http://www.turbominis.co.uk/

donut - 9/11/07 at 02:23 PM

I have a friend who builds and services mini's so i'm sorted for turbo info!!

What's lowering the CR? Is that combustion ratio?

[Edited on 9/11/07 by donut]

MikeRJ - 9/11/07 at 02:40 PM

quote:
Originally posted by donut
What's lowering the CR? Is that combustion ratio?


Compression ratio.

If you can get hold of them, the pistons from a Metro van gave a nice low CR for upping the boost. In it's stock form the turbo had a fairly high CR (9.3:1 IIRC) and boost was limited to a measly 4PSI around the peak torque RPM increasing to 7PSI as the RPM increased. This was primarily to save the gearbox from destruction, but running 7PSI on an unmodified engine also resulted in detonation. Mostly down to the lack of intercooler I suspect.

The proper Metro turbo head has sodium cooled exhaust valves as the standard heads suffered from burnt valves.

Surrey Dave - 9/11/07 at 04:11 PM

You wouldn't use a sh+++y bmc gearbox though would you!!!!!

You can get an adaptor for the type 9 Ford

Could be OK an 'A' series is not too heavy.

Didn't the standard Metro Turbo have about 90bhp?

donut - 9/11/07 at 04:21 PM

Where or who does the type 9 adaptor?

I had a midget years ago and the gearbox was fine.

iank - 9/11/07 at 05:08 PM

http://www.mgcars.org.uk/frontline/ do Type9 bellhousings.

donut - 9/11/07 at 07:00 PM

Sorry iank that a 5 speed conversion for the orig box, not a conversion to the ford type 9 which i thin is only available for the k series engine.

iank - 9/11/07 at 10:58 PM

99% certain it's a type 9 to A series (or chocolate 1500cc Triumph engine). Not that it says that on the 5 speed page, but it does admit it's a 'Ford 5 speed box' on the price list page. In the past they had a 5 speed toyota box but the donors ran out IIRC. A quick google finds at least one reference to a 'sierra' 5-speed to 1500cc from Frontline.

Give them a call to confirm one way or another if you're in the market for one.

MikeRJ - 9/11/07 at 11:29 PM

quote:
Originally posted by Surrey Dave
Didn't the standard Metro Turbo have about 90bhp?


93bhp, 85lbft from the factory. They have been made to push out over 200bhp, but it's probably rather closer to a grenade than an engine by that stage.

I have to say that I really like the A series. It's crude, rough and limited by the 5 port head, but still a great little engine considering it first saw the light of day in the early fifties. And of course it was one of the original fitments to the Lotus 7.