Honda injectors
Turbo Mini Forums

Actually from RC Engineering

http://www.rceng.com/index.aspx

but sourced in the UK



Honda end fittings but the standard size Bosch O-rings fit fine (tried on the left hand one only) so I can keep my fuel rails "standard".

1000cc/min so if I use all 4 at 2 X 20% duty cycle, staged, that would allow a minimum of 260hp possibly more if I used the new "single pulse" mode in Jean's latest version of the code.

Truely frightening !!!

Although I've already got the test engine idleing perfectly with two 680cc injectors, meaning these should be OK staged (ie, the idle injector would only be 50% bigger than before), I'll probably stick with the 680cc for the first stage and just use two of these giving 1,680cc per port.

EDIT - low z (like all my others) but as they will be driven with Jean's P&H circuitry for the 4 injector staged variant of the code that isn't an issue.

Edited by Rod S on 5th Aug, 2009.

Schrödinger's cat - so which one am I ???

That should be enough (barely :) )

But if you find out you need more you could try these: http://www.moranmotorsports.com/products/c...ex.php?cPath=63. With up to 5000cc/min, that should be sufficient...

Jean

http://www.jbperf.com/

RC's dont spray nice...just be aware.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Stevie,

They certainly have a rather strange three point flow nozzle that I've never seen before but, considering the angles I have to mount these at to get them to work on a 5 port head anyway, spray pattern isn't too important.

(picture from another thread)


I think it was Paul S who quoted from Vizard that the A series doesn't like a finely atomised spray anyway, so time will tell once I have this version up and running.

The problem with all of this is that, at the moment, there is little way of comparing this and judging the differences.

We need a few more people to get involved.

Schrödinger's cat - so which one am I ???

The rover injectors a la MPI also have the three nozzle end, work a OK on lots of Rovers.

to give you an idea....

I had a 5.7 running perfectly on Siemens 600cc, batch fire.

I fitted some 750cc ones to my 5.7, at the same time as a larger cam. Not a big one by any means, but larger.

I tried for days, and I couldnt even get the engine to run.

Popping and banging at best.

After pulling all of my hair out, I finally refitted the old injectors....bang, first time.

Eventually I did get to use them on a larger 6.3, with better heads etc They did work fine, but it took a long time to get the idle right.

And once all said and done...I really dont believe they flowed much more than the Siemens anyway, as they still werent large enough.

its the reason I ended up with 2 inj per cylinder.....Siemens of course.

Im not saying the RC's dont work, I'm saying they need to be chosen wisely. If you are expecting them to perform well at low duty cycles or pulse widths. Dont hold your breath.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

Interesting......

What I'll do first then is put two of them in the test engine (which idles fine on 680cc Weber Marelli injectors) and reset the "reqd fuel" value to suit (to give the same lambda) and compare the idle.

On the 1000cc injector, the pulse width at idle will be tiny (which is why I was going to stage them in after the 680cc ones) so it will be an interesting test.

The test certificate shows them all within tolerance (998 - 1006cc across the four) but, interestingly, doesn't show at what duty cycle they were tested.

Again, I'm not sure if there is a standard way of testing - if it's just at 100% then the true flow rate (inc openning/closing) is lost - the Webers were tested at 50% duty.

The open/close time is obviously quite important in this particular application where the duty cycle has to be very low for the siamese code to work (ie, to match actual valve open times) and that is why I have stuck with low z injectors..... hard to prove I know, but the laws of physics say they should open quicker. The Siemens are high z and the Bosch, which would have been my prefered (low z) choice, were very expensive compared to these.

Schrödinger's cat - so which one am I ???

Looks like your going ot have some fun with those big boys,

As you say Injector opening/close time is going to efect you with these, do you have the dead time info for different voltages? as this is what i have been playing with and ended up pulling my large injectors out for now to revisit later as it was a headache for a daily driven GTM, but being low imp you should be in a better startin gpostion than myself i have high imped 520cc

From memory RC are flowed at 80% duty, I did have some Rcs but sold them to a friend for a Turbo CRX

West

Edited by SidewaysGTM on 8th Aug, 2009.

Got A GTM With A Honda In the Back, and huge Nitrous bottle where the passenger seat should be when racing!

Really they need to be flow tested at say 50 and 80% to get a better picture.

I think RC flow data would likely be at 100%, purely as they are 1000cc injectors, and flow claimed is circa 1000cc

Cant comment if it works across the board.

But my Siemens dead time ( found using DTA's self test ) is about 0.65ms

With I was using the 750cc RC's it was something like 1.15ms

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will