Injector Scoops....Lotsa pictures.

This year at the California Hot Rod Reunion I decided to take pictures of injector scoops. Not sure why but I sure do like them!

 

1 [tp://i101.photobucket.com/albums/m79/kiwikevinp/misc%20stuff/IMG_3961.jpg[/IMG]

 

Wow, it's like an injector orgy.

 

I for one am glad that you took all of those pics. I have had an idea rattling around in my brain for a scoop on my car. Now I am inspired.

 

Cool pictures.
Oh shit I just remembered I need to go check the mail.

 

Thanks Kev...me like

 

Nice, thanks for posting.

 

Too cool !!!

 

Thanks Kev! Saved a bunch of those for ideas for mine one day.

 

Thanks for posting, I like how the Hilborn 8 port scoop looks like a loudspeaker from the back. Got a club mate lookin for one o' those (he's got the injector but no scoop).

 

Real cool post...thanks for sharing the pics.

 

Can someone school me on this type of injection? All I have ever seen are diesels and modern EFI. I haven't had the opportunity to hold any of this stuff in my hand to study it and understand how it works, but I have a pretty good idea.

I see the fuel lines leading into the throttle bodies, but what's inside?
Is it some kind of perforated tube? Are they some kind of changeable jets?
Are the size of the orfice somehow related to the type of fuel used?
What kind of fuel pressure do these run?
How is the fuel delivery actuated? I usually see these have some crank driven pump. I'm guessing the butterflies are some how linked to the fuel block and a metered amount of fuel delivered depending on the throttle position.

Its seems that FI would be much simpler to build and tune than trying to tune multiple carbs, but I seldom see anyone but serious race engines running such a setup.

 

I like them too! Great thread and thanks for posting the pictures. I'm planning on building some kind of scoop this winter for my truck.

 

A very timely post,my hilbore 2 port is on the way . Thanks

 

Cool stuff Kev! Dig that Donovan 4 port and the SCOTT!

 

KOOL pics. ME LIKE

 

When do you decide what you're going to take pictures of- when you get there or beforehand? It's a very interesting approach. A book (CD, web site) in sections like this would be cool. You could start with a picture book. If you wanted to, in the next book you could add some basic tech. I'm with Frank, someone do a mechanical fuel injection tech- it is tech week after all.

Thanks,
Kurt

PS- Can anyone recommend a good book on vintage dragsters?

 

killer thread!

 

its complicated but simple fuel goes from the pump to the barrel valve usually on the side or infront of the injector wich is conected by a shaft to the butterflys the barrel valve has a mainjet and the fuel lines all have their own smaller jet on the injector end and then a nossle which spays fuel directly into the blower or manifold or both when the throttle is opend the butterfys and barrel valve open together and heypresto bobs your muvvers bruvver
you dont often see this cind of setup on the street because it can be dificult to start but people do overcome this for the ultimate look

 

btw has anybody on the hamb got a barndoor scoop they dont need i have the lower half but still need the scoop its the original enderle item im after cheers duncan.

 

thanks for posting this kev. I always loved the scott super slot. You wouldnt happen to have any more pictures of the don garlits digger with the new hemi in it? I would love to see them if you do.

 

The mechanical injection deal is simple. The pump is generally driven off the cam (or sometimes by a gilmer belt from the crank) and it sends fuel to the barrel valve (usually on the left side of the injector). The barrel valve is connected to the throttle butterflies with short linkage that is adjustable. The barrel valve has a spool inside with a port that allows fuel to pass through to the lines that go to the motor. That port can have different shapes for different applications but basically it flows more fuel as the butterflies open and allow more air into the engine. There is a jet in the barrel valve body that allows some fuel to return to the tank, thus putting in a larger jet makes the engine leaner--just the opposite of a carburettor. Most systems also have a "high speed" which is another place for fuel to return to the tank. In that case it is controlled by another jet and also a spring that can be varied to change the point at which the fuel bleeds back to the tank. When the fuel pressure reaches a pre determined level the check valve in the high speed opens and allows fuel to flow through the jet. Again, bigger jet means leaner motor.
If you hear a tuner talking about "leaning her three flats" he is talking about adjusting the linkage between the BV and the butterflies to vary the air/fuel ratio. Counting the flats as the the hex shaped link bar is rotated is a simple way to quantify the adjustment.
From the exit port on the BV the fuel flows to the nozzles themselves via distribution blocks. Most systems have a main nozzle body with a changeable jet that is varied to finesse the tune-up. The early "showerhead" Enderle units had a couple of large nozzles in the hat but most later units have 4 or more nozzles spaced along each side of the base of the injector just above the blower itself.
To allow finer tuning of individual cylinders port nozzles are common. In the era of the injectors shown in Kiwi Kev's pix there was usually one nozzle per cylinder in the intake manifold, spraying right into the intake port.
If you look at Kev's pix you should be able to see most of the components that I have described.
Current fuel car technology has some nozzles spraying directly into the supercharger behind the hat itself as well as the hat nozzles, a set of port nozzles in the manifold and then a pair of nozzles per cylinder in the cylinder head under the valve cover, spraying right at the back of the intake valves. That is how they manage to flow enough fuel to require a 100 plus gallon per minute pump. The current cars also control flow and pressure in the system with various pneumatically actuated timers and/or pressure controlled flow valves.

Roo
ps Nice pix Kev--you do alright for a Kiwi<G>

 

Thanks Kev, those pics literally brought tears to my eyes.

 

Must be a Nitro flashback!

 

look here, Sam did a great TECH thread a while back...

http://www.jalopyjournal.com/forum/showthread.php?t=48771

Maybe he could re-add the photo's again...and the moderators can put into the tech section...

This is a great thread also, any more Kev (or anyone else)

Cheers,

Drewfus

 

Great stuff, as always. Good talkin to ya Saturday @ Squeeks

 

Man..........kewl old injecter hats.....I can just about smell the fuel!!

Paco