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Direct injection adapted to old school heads

76zimmer

76zimmer

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Wouldnt that be the shiznit?
Was just reading about the direct injection coming on the new LS engines.
Been around for a few years on gas, and forever on diesels, but thought it would be cool on an old BBC.

thoughts?
 
been on outboards for a long time too...

i'll be curious to see aftermarket head companies offerings and retro-fits in the coming yrs... personally, I'm a long way off from such a system... heck, I'm still trying to get to a regular dry manifold mp setup! :haha: soon, soon.....
 
sounds like to really take advantage new design pistons would be needed as well to optimize the spray to sparkplug pattern and to raise comp. also. Looks like cam patterns are changed significantly as well to take advantage of dry flow overlap through the cylinder. Holy crap I'm getting techno geeky and its starting to scare me.
 
I really think with the abundance of LS engines out there, that the demand for this won't be very high.

Interesting though. Remember the OHC conversions for big blocks and small blocks.

Cool stuff but seemed like it never really caught on
 
yeah, definitely not just slapping some heads on...

my biggest concern is what it'll do to the cost of a pair of heads and the long term durability...
 
yeah good point Eric....seems like a cool idea though don't it?
 
ryoken said:
yeah, definitely not just slapping some heads on...

my biggest concern is what it'll do to the cost of a pair of heads and the long term durability...
Click to expand...


right, I have to throw this at my head guy....he's done some prototype work for Ford before, I'll see what he has to say about it.
 
You would'nt beleive how lean a direct engine can run for fuel milage! But it won't come that way, would fail emmissions...
 
What I would like to see tried, is compression ignition of gasoline. Like diesel, but with high pressure fuel direct injection, timed to just after TDC.
You can't run gas in a diesel because it ignites too soon.

But, with computer control, and high pressure injectors, you should be able to spray gas in the cylinder after or just before the piston passes TDC.

The fuel should begin to burn as soon as it hits the superheated air in the cylinder, and burn rather than detonate. Nice even flame front.

You would get the higher efficiency of high compression with cheaper fuel.

Or one heck of an explosion.

Either way, it should be impressive.
 
Fordum said:
What I would like to see tried, is compression ignition of gasoline. Like diesel, but with high pressure fuel direct injection, timed to just after TDC.
Click to expand...

I was sure that GM issued some press releases about this maybe 5 years ago. It was a gas engine that ran normally with spark ignition, but then dieseled during cruise. They were talking about huge efficiency gains and I was thinking that this could take over the whole market, but since then I've heard nothing and can't even find reference to it now.

And direct injection sounds great until you spend $1800 for a set of injectors every time one of them acts up. OK, your truck gets 18MPG now instead of 15MPG, at $3.20/gallon - $1800 = ??
 
That most likely will be the wave of the future though. Once they get the bugs ironed out, it will be on. I honestly expect cams to vanish eventually and valve duties be taken over by solenoids, kinda like Indy cars. I mean this is all way down the road, but EFI in general at one time was the bane of hot rodders everywhere, and look at it now.
 
Camless engines have been prototyped, but the solenoid control requires more precision. IIRC, early ones would hammer the valve seats to early deaths. Once you get it to work, huge new areas of engine control are possible.

If an aftermarket head supplier offered direct injection heads, what engine controller would you use and what injectors?
 
Not only the engine controller and injector and head... look at how much pressure is needed and add cost of fuel supply.
 
it sure wouldn't be cheap would it?

But cool rarely is!
 
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