Direct Injection for A-Series?

[mab01uk]

Interesting idea from Specialist Components?





"2015 will be the year when SC make history and eradicate charge robbing of the 5 Port cylinder head!
Using our very latest ECU technology, our engineering capability and ability to 'think outside the box' we are developing the first and only direct injection Classic Mini engine. All of the electronics and hardware have been designed and developed in-house in Norfolk, England"
https://www.facebook.com/pages/Speciali ... 1656335284

[Sean1380]

I always wondered if this could be done.

Makes perfect sense.

[In the shed]

It doesn't stop the suck-suck----gap-gap of the inlet ports and the fact that the inlet valve at the beginning of each suck are in different pressure and velocity environments.

Nice thought, but they haven't solved the problem associated with mass flow.

[Chalkie]

Supercharger bolted to it

[Spider]

It doesn't stop the suck-suck----gap-gap of the inlet ports and the fact that the inlet valve at the beginning of each suck are in different pressure and velocity environments.

Nice thought, but they haven't solved the problem associated with mass flow.

Yes and no - I think.

Yes they have in part solved it as the port walls won't 'wet' and so give uneven mixture to adjoining cylinders.

No because it is still a Siamese Port (as you've more or less said) where we get Port Robbing.

However, I'll give them the benefit of the doubt, it's also pretty impressive as to what can be done with electronics and programing to overcome (compensate?) for such short comings, after all, Rover manage to make MPI work when others said impossible.

I am looking on with interest.

[mk1]

SC have done some excellent work in this field & TBH if anyone can make this direct injection system work, I am sure they will be able to.

As has been said, I will watch with interest.

[rumba5278]

MY MPI 2000,WORKS PERFECT AND VERY ECONOMIC

[larrysimon]

Why would anyone think a GDI A series is a good idea ?

If they had to work on GDi engines from all the main vehicle manufacturers they would soon realise GDi is a disaster for any ICE.

Ports and valves clog with oil and combustion gas blow by residue on all Gdi engines requiring expensive cleaning and repair work.

[timmy201]

If you don’t have a pcv and emissions system adding the blowby gases to the intake then it shouldn’t clog up.

I can see this system may solve the port robbing issue on a 5 port mini head, but if you are going to this extreme, then a 7 or 8 port seems like a logical first step? I’d assume most racing series that specify a 5 port head wouldn’t be happy with direct injection?

But it’s always great to see a company pushing the boundaries with a series and minis. I haven’t seen many updates the last 8 years - did they make much progress?

[mk1]

This was a post from 2015, I haven't heard anything about the SC Direct Injection system since. I assume it was a dead end.

Still, always worth trying these things.

[Spider]

Why would anyone think a GDI A series is a good idea ?

If they had to work on GDi engines from all the main vehicle manufacturers they would soon realise GDi is a disaster for any ICE.

Ports and valves clog with oil and combustion gas blow by residue on all Gdi engines requiring expensive cleaning and repair work.

Mercedes and I think BMW used it very successfully on many engines they used during WWII, particularly for Aircraft.

[larrysimon]

If you don’t have a pcv and emissions system adding the blowby gases to the intake then it shouldn’t clog up.

I can see this system may solve the port robbing issue on a 5 port mini head, but if you are going to this extreme, then a 7 or 8 port seems like a logical first step? I’d assume most racing series that specify a 5 port head wouldn’t be happy with direct injection?

But it’s always great to see a company pushing the boundaries with a series and minis. I haven’t seen many updates the last 8 years - did they make much progress?

Yes it would clog up as Oil drawn down the inlet valve guides contaminates the Inlet valve and port because the incoming fuel rich mixture that normally washes any contaminates off the inlet valve is not happening on GDi engines.

Aircraft engine usually have sleeve type valves or pocket ports in the cylinder bore like two strokes, hence GDi can work with that design but over all GDi its a dead duck that needs binning.

[Peter Laidler]

....... on an A series engine? Is this another case of flogging a dead horse?

[Spider]

Coventry were developing Sleeve Valves, but they didn't get them in to production until just about at the end of the war.

Merc and BMW used poppet valves all the way through.

Rolls Royce too eventually got on board with DI, but that wasn't until about 1944, all on poppet valves.

[larrysimon]

Coventry were developing Sleeve Valves, but they didn't get them in to production until just about at the end of the war.

Merc and BMW used poppet valves all the way through.

Rolls Royce too eventually got on board with DI, but that wasn't until about 1944, all on poppet valves.

The Hawker Typhoon Napier Sabre had a Sleeve valve engine one of the most powerful engines produced during WW2 but was very unreliable.

[Lakeland997]

Our Scirocco R race car (covered 40,000 miles) intake port before and after walnut blasting. A time consuming but ultimately satisfying job.