direct injection
Turbo Mini Forums

anyone given direct injection some thought ?
bosch sell parts for factory installations , or take the necessary off an existing engine eg, mitsubishi GDI ?
i think the injector could be possitioned in the head next to the plug (enough metal around that area in the casting for both )
no charge robbing , injectors that increase swirl and can localise burn around the plug , perfect mixture at all times?

Do you want to run homogenious or stratified?

(sp)

Alex

AlexF

I've no idea on the spelling!

I've thought about it - Marcel has thought about it more though....

As soon as i heard (and i could be mistaken) 1800psi rail pressures I went off the idea... quickly... LOL!

I have never thought about this, however from what I have read regarding the performance of the Mitsubishi GDi engines I understand there is still some work to be done to get this to work properly.
A friend with a Shogun Pinin fitted with a 2.0 GDi engine has just had to take it back to the dealership for the second time, for what they described as a "de-coke".

Surely a modern engine running correctly on modern fuels would not require this if all was well.

The inlet valve coke badly as there is no fuel to clean them!!

You dont need 1800 psi, thats for diesels!

80-100 bar will do it

Alex

AlexF

On 30/12/2005 22:28:42 AlexF2003 said:

You dont need 1800 psi, thats for diesels! 80-100 bar will do it
Alex

www.starchak.ca and www.TDCperformance.ca

someone care to explain (assuming you cant) why you couldnt technically run craploads of boost on a high CR engine? if you retarded teh injection event to a point where it was after the point of detonation, if that makes sence.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

In simple terms evo - you've retarded the ignmition so far the engine will never make any decent power ... It'll make boost, which is great for 'chav wars' but you'll be racing milkfloats to the finish line!

so the inlet valve may be cokeing because the inlet durations long? or when the injector is trying to get the mixture localised to the plug and its too close to the inl. valve ?
could be shortened with forced induction ?
i know the fuel pressure makes the thing like a time bomb , but hoses, pumps and fittings etc are in general production now

doubt it would be that dangerous. i meen the part of the fuel system that is at that pressure will only be a very short run, 1 leak and due to the hydraulic nature of the working fluid by the time a teensy weensy amount has excaped the fuel rail will be down to a more civil pressure. imho ofcource.. i would if there was a noteable gain to be had.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Hmm I don't know, 1500psi is a HELL of a lot! I work on hydraulic systems that run at up to 800psi, trust me that doing anything at that sort of pressure is hairy enough, I would not want to be messing with 1500psi. Yesterday I had to reintroduce a pressure vessel as big as a regular house at about 810psi to a valve skid that had been drained for repair. Not pleasant, in fact I will admit I was bloody windy about doing it!

Hi,
As far as fuel pressures go, the common rail diesels are running 1800 bar on full boost. Yes BAR! The problem the Mitsi's have is with the injectors clogging. As you will probably know from leaving an injection car standing around is the injectors get clogged with dried fuel, when you put the injector in the combustion chamber this happens a lot quicker. The ecu will look at the o2 sensor and keep adjusting the pulse width until it can't go any further, then its dealer time....
Cheers,
Gavin. :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

On 04/01/2006 16:05:26 Bat said:

Hi,
As far as fuel pressures go, the common rail diesels are running 1800 bar on full boost. Yes BAR!

Edited by Doodmeister on 4th Jan, 2006.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

Hi,
@ Doodmeister.... It does sound crazy, 'till you realise they're already doing it. And I'm already behind the times!!!!!!!!!!!!
Cheers,
Gavin. :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

I'm guessing that the fuel pressure is dependant on what point in the cycle the injection takes place, ie if you inject during the induction stroke you're going to need considerable less fuel pressure that if you inject at the top of the compression stroke, or have I got the wrong end of the stick again?

Even if you didn't need to pressurise the fuel much at the induction stroke, you still need an injector nose that can stand the rigours of the explosion ...

I like to think about crazy projects but this one I have given up because it won't give back the effort it needs.
(you still get interrobing issues with a big cam I guess)

But hey, why not !

I believe converting your 5 porter in a 7 porter with home tools would be less demanding and more rewarding ...

Rusty by nature

Well as SC are the only company in the UK, possibly Europe or further afield to be able to run,map and tune common rail diesel engines (we know we are as we have the contracts in place where others have failed) when they aren't in cars (you can't simply use the oe ecu as that requires you have the following parts as well, abs,dashboard,steering systems,chassis looms, alarms,immobilisers etc)means we could also run direct injection petrol engines as the injector technology is similar.

full control over the vnt turbos and 3 or more seperate injection cycles to control noise/power/emmisions - imagine that in a mini engine.lol!

JK

If Carling made Mini engines
it would probably be like this one!

Yes i moved to the darkside

Instagram @jdm_brett

ooh old thread! since then i have done work on mitsubishi gdi engines, particualrly preplacing the high pressure pumps that f*ck up. on the bright side if the high pressure line is ruptured, you only get a wee bit of petrol out, not an exposion, on the downside there shite, and very expensive. also read that the emissions are very nasty due to the nature of the burn.. as in nasty to us mortals, could be a load of crap but raised my eyebrow!

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.