was browsing and dreaming about efi and i remembered that in the changeover from carbs to efi in mass production, there was a time when lots of small cars had single point injection...

has anyone replaced their carbies with this set up?

i'm just dreaming now, i think when i go efi it'll be in conjuction with an sc12 or a xflow head.... but that's probably a good lotto ticket away.

I'm pretty sure most mini's with fuel injection have the SPI instead of the MPI as MPI only came out for a few years. I'd assume SPI is slightly better for fuel consumption than a carby and MPI will only be a little better than SPI I think the main benefit is the "green effect" slightly less emissions for no real power gain. (Correct me if I'm wrong.)

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Respect mine and I'll respect yours.

Main benefit of SPI was better emissions and fuel economy, for a HP LOSS.
Hence why folks in the UK bin the injection and retrofit a carby or 2.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

SPIs aren't that crash hot for fuel consumption anyway, they still average about 8-9 L/100km.

The only time SPI should be considered is in an intercooled turbo configuration

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Lillee - 1969 Morris Mini K

The only time SPI should be considered is in an 8-port intercooled turbo configuration

Wouldn't do it on an N/A nor on a siamese port personally.

Pete

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Click here for the Turbo Conversion Thread!

Maybe I'm dumb or old (yes to the latter) but why would you bother to use SPI on an 8 (or 7) port head when you have 4 nice separate inlet ports??
Surely MPI is the way to go then.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I don't know about that, I get 41 mpg driving around Sydney out of mine.
And no I am not driving Miss Daisy.
Cheers Pete

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A recent study found the average Aussie walks about 900 miles a year
Another study found Aussies drink, on average, 22 gallons of alcohol a year
That means, on average, Australians get about 41 miles per gallon

Kind of makes you proud to be an AUSSIE

I always figured with mpi (or individual throttle bodies to be precise) are for n/a only as its wasted effort to direct air more smoothly when its being forced through at 10-15psi.

Its easier just to chuck a single big throttle body and let everything be pressurised.
Nowadays the usual way is to have a single throttle body leading into one injector per cylinder.

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Simplify and add lightness

True - my point was I wouldnt INJECT a siamese port period... N/A or Turbo... but 7/8 port... absolutely. SPI, MPI, whatever setup but point being about 5 porters... thats all.

If I had the $$ I would get an 8 port and inject it, would look into all injection options and then work out what works best (and fits lol)

Pete

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Click here for the Turbo Conversion Thread!