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Author Topic: Megasquirt questions  (Read 2249 times)

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Andy B

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Re: Megasquirt questions
« Reply #15 on: 16 September 2011, 16:09:35 »

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The ports are quite poor, ...

hence the K1200 BMW cyl head.  :y
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Martin_1962

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Re: Megasquirt questions
« Reply #16 on: 16 September 2011, 16:10:13 »

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Throttle bodies from motorbikes seem to be a common way of injecting an older car.

Yep. they are a great intake upgrade for a tuned 4 pot and they sound almost as good as a pair of sidedraught carbs. Not quite the same but they bark nicely. :-*
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Or another was I saw was the other weekend at a car show, where the owner of a Morris Minor had bolted a K1200 motorbike cylinder head to the block of a (1400?) Marina engine!  :-?
I've heard about that conversion. The bottom end is an A series. Why they don't bin the whole A series instead of just the head I'm not sure. ;)


A series - quite an antique - I am not a fan of them.

The ports are quite poor, the crank design is not good, yet it is worshipped.

Good. ;) Because they're the devil's work when it comes to fuel injecting them with their siamesed intake ports. Useful only as a door stop / boat anchor, etc. ;)


But then I like the old Hillman to Talbot lump (come across a few in Rootes Group cars and my Sunbeam), but lots don't, short stroke, large bore, 8 port head, capacity for massive valves, crank good for 8000rpm or 200bhp, cam high in block for short pushrods. However non crossflow.
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Martin_1962

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Re: Megasquirt questions
« Reply #17 on: 16 September 2011, 16:11:22 »

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The ports are quite poor, ...

hence the K1200 BMW cyl head.  :y


Isn't putting a better engine in a better solution?
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Andy B

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Re: Megasquirt questions
« Reply #18 on: 16 September 2011, 16:18:05 »

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The ports are quite poor, ...

hence the K1200 BMW cyl head.  :y


Isn't putting a better engine in a better solution?

I agree.  :y
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Kevin Wood

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Re: Megasquirt questions
« Reply #19 on: 16 September 2011, 16:21:47 »

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The ports are quite poor, ...

hence the K1200 BMW cyl head.  :y


Isn't putting a better engine in a better solution?

I agree.  :y

In a Morris Minor, where you can just go out and find a RWD gearbox to match and cut and shut a propshaft, certainly.

I suspect it was for the mini where keeping the A series bottom end became desirable.
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Nick W

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Re: Megasquirt questions
« Reply #20 on: 16 September 2011, 17:08:32 »

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But then I like the old Hillman to Talbot lump (come across a few in Rootes Group cars and my Sunbeam), but lots don't, short stroke, large bore, 8 port head, capacity for massive valves, crank good for 8000rpm or 200bhp, cam high in block for short pushrods. However non crossflow.

It was only used in Avengers and Sunbeams; the similar Hunter 1725 was totally different. Current rally spec Avenger engines make about 190hp and turn to 9000rpm, using stock crank,rods and rocker gear! Not that it was over-engineered. If you use the Brazilian block, crank and rods, with 2.8i pistons you get a stock looking, but  2.0l engine, which sounds fun.
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Martin_1962

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Re: Megasquirt questions
« Reply #21 on: 16 September 2011, 17:45:41 »

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But then I like the old Hillman to Talbot lump (come across a few in Rootes Group cars and my Sunbeam), but lots don't, short stroke, large bore, 8 port head, capacity for massive valves, crank good for 8000rpm or 200bhp, cam high in block for short pushrods. However non crossflow.

It was only used in Avengers and Sunbeams; the similar Hunter 1725 was totally different. Current rally spec Avenger engines make about 190hp and turn to 9000rpm, using stock crank,rods and rocker gear! Not that it was over-engineered. If you use the Brazilian block, crank and rods, with 2.8i pistons you get a stock looking, but  2.0l engine, which sounds fun.


Wow

I would love another
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Re: Megasquirt questions
« Reply #22 on: 16 September 2011, 18:21:34 »

I used to have an 'ear' for twin carbs, was in great demand for balancing them.
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Andy B

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Re: Megasquirt questions
« Reply #23 on: 16 September 2011, 19:26:10 »

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I suspect it was for the mini where keeping the A series bottom end became desirable.

Quite likely ....... I wonder if you could get a Chevy small block in a Mini  ;D ;D
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aaronjb

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Re: Megasquirt questions
« Reply #24 on: 16 September 2011, 19:46:15 »

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I suspect it was for the mini where keeping the A series bottom end became desirable.

Quite likely ....... I wonder if you could get a Chevy small block in a Mini  ;D ;D

Pretty sure it's been done - I'm positive an RV8 Mini has been done.. but the engine is in the back  ;D
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Re: Megasquirt questions
« Reply #25 on: 16 September 2011, 21:43:52 »

There are a few RV8 minis which are still front wheel drive, think they used the Princess gearbox though.
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Kevin Wood

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Re: Megasquirt questions
« Reply #26 on: 16 September 2011, 22:22:06 »

There's Doris, for a start. Built by a fellow Megasquirt forum veteran.

http://www.spagweb.com/v8mini/doris/index.htm
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aaronjb

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Re: Megasquirt questions
« Reply #27 on: 16 September 2011, 23:00:10 »

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There's Doris, for a start. Built by a fellow Megasquirt forum veteran.

http://www.spagweb.com/v8mini/doris/index.htm

Very nice :y
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