Author Topic: Mustang Injectors in an M42 engine (Read 261360 times)

papercutout · « **Reply #135 on:** April 21, 2009, 05:13:09 PM »

Thanks for that - thats also added in another option! Tomorrow I'll find a pic of a stock M42 injector, start comparing shapes so I can get one that looks the right type, ask sellers for photo's of the injector tips etc!

Ok, so high and low impedance is cleared up, how about the differences within them? Stick with high since thats relevant...

What'll the difference be on an injector rated at 200 cc/min with say a 12 resistance rating, and one at 200 cc/min, but resistance of 15.9? Faster flow on the 12. Which essentially makes naff all difference?

Important thing to remember:

(so, aim similar/slightly higher)
M42 injector is 0280150714 192cc/min 15.8/9 resistance. (please double check that for me!)
(there's so much variation, the site you gave me said the above figure, the site I provided says 200cc/min, and someone at the beginning of the thread says 213cc/min! ARGH!)

Aim is for about 200-205cc/min about 16 resistance, pretty much like you then!

You've been a star, BUT I think you desperately need to lower your car

Or at least stiffen her up

Update: I'm still searching around atm, I suspect I'm going to quite literally go through the list of specs and compare whats viable! I'm researching the ones from V6's atm, dropped a few emails, had one reply stating 'These are a split spray pattern 'V' type.' which I'm trying to verify with photo's. If I get some, and find 4 pintle ones, I'll post up the results.

papercutout · « **Reply #136 on:** May 09, 2009, 10:48:31 AM »

You'll all be happy to hear you CAN get 4 pintle Vectra 2.5 V6 injectors, and they DO fit! I think they're from the GSI version - the non GSI ones are the ones with a v shaped hole.

But, like tjts1 I had to do some modding - I didn't have washers big enough and I live in a village with no shops, so I got a file out and started filing the fuel rail mounts down. took around 1.5mm off, and they now all sit fine and dandy! No pics of that though I'm afraid - you can imagine what 2 mounts look like filed down!

When fitting, I fitted them to the fuel rail, THEN inserted them in the holes. Not what the picture shows, that was when I first put them in, and realised that that wouldn't work!

Car feels slightly smoother and torquier. Its also stopped popping at all on downshifts

I have 'knife' edged the throttle body butterflies and made a decent intake (piece of pipe through what was the main beam to airbox). Plan for tomorrow is to remove the second midbox again, I know that'll help too!

Pics:

tjts1 · « **Reply #137 on:** May 09, 2009, 08:05:25 PM »

Hey nice work and great writeup! That's exactly the injector PN (0280155712) I picked up off a saab 900 at the JY.
cheers
Justin

papercutout · « **Reply #138 on:** May 10, 2009, 02:56:06 PM »

Is that what you're now using then?

I'm not sure what engine work I can actually do to make the upgrade worth it. Although the car does seem to be doing as well, if not better on fuel already (the car is running some chip that it came with), but I'll keep checking that as the miles go by.
What other mods have you done? Much difference? I'd love to cam the car, but I'd have to find one 2nd hand (I don't do expensive!)

When're you lowering your car then?

Pitch-Black · « **Reply #139 on:** May 11, 2009, 07:27:42 AM »

So in the end, is this mod worth doing?

Looks like a lot of work just for a smoother idle!

Or will you have gain in power also?

///m42 sport · « **Reply #140 on:** May 12, 2009, 09:44:16 PM »

what about fuel economy?

bbarnumboy · « **Reply #141 on:** May 12, 2009, 10:34:06 PM »

is it worth it on the e36 m42, mine already has 4 pintle, would i see any change for the better.

papercutout · « **Reply #142 on:** May 13, 2009, 11:29:37 AM »

bbarnumboy - I'd say no. Unless you're doing engine mods, and so need to upgrade for higher flowing injectors of course.

I'll report back about the fuel economy, but despite the ones I got (part #0280155712) apparently flowing 213cc/min, I think the fuel economy has improved. Sitting at 70-75mph on the motorway she was sitting at the mark after 30mpg mark (is that 40 or 50 mpg?), whereas I used to get 35ish mpg on the flat. Also, after thrashing the car around a bit both sat and sunday I'm still going to get about 300 miles to a full tank, whereas I used to JUST get 300 miles if I took it easy all the time.
This still needs lots of watching though, and I'll report back.

Pitch-Black - as above, and I think it depends on what accompanying mods you do. When I cut my midbox out again (leaving only the frontbox and cherry bomb rear) I noticed another power increase! Without doing this, there's a minor increase all-round, but with a better flowing exhaust too, its definitely better and worth it for the �30 I payed for the injectors, and �17 I payed for 2meters of stainless exhaust tubing MONTHS ago, and the �50 I payed for the 2nd hand welder, thats done pretty much all my welding on the car!

Bmw02er · « **Reply #143 on:** May 24, 2009, 06:13:29 AM »

papercutout, just for the record, you mean you filed down these two points? You took the thread bolts out I assume.

tjts1 · « **Reply #144 on:** May 24, 2009, 07:32:03 AM »

I realize now the whole washer thing is pointless. The injectors fit without modification. We installed a set for 19# EV6 injectors in another M42 with no washers, no modifications. I edited my previous posts to reflect this.

Bmw02er · « **Reply #145 on:** May 24, 2009, 03:13:28 PM »

Quote from: tjts1;72342

I realize now the whole washer thing is pointless. The injectors fit without modification. We installed a set for 19# EV6 injectors in another M42 with no washers, no modifications. I edited my previous posts to reflect this.

Does this count for all injectors i.e. does a little difference in length with the stock injectors make no difference? Or just for the ones you tested? I was considering to upgrade to the Bosch 0280155712 injectors.

tjts1 · « **Reply #146 on:** May 24, 2009, 11:41:47 PM »

Only applies to EV1 (stock E30/M42) long EV6 injectors.

papercutout · « **Reply #147 on:** May 25, 2009, 07:02:16 AM »

Quote from: Bmw02er;72341

papercutout, just for the record, you mean you filed down these two points? You took the thread bolts out I assume.

Nope, I didn't take the thread out, I was just very careful not to mangle the thread so much it wasn't at all useable! Obviously, if you can be bothered, removing it WOULD be the best idea. It'd also make filing it down a hell of a lot easier!
Just to make life easier - were stock injectors to go back in, they would still fit fine, they'd just sit slightly further in.

tjts1 - when I did mine the o-rings were pretty much sat on top of the injector holes, hence filing it down. So obviously it does apply for some injectors, although filing down is probably better than fitting a washer in there

Bmw02er · « **Reply #148 on:** May 26, 2009, 05:32:35 AM »

Thanks papercutout. I will follow your example. Seems like the nicest route to take.

dinu.negrean · « **Reply #149 on:** June 22, 2009, 10:34:47 AM »

Hey guys, I just made the injectors swap on my E36 '93 M42. I upgraded to the 0280 155 712 Vectra B 2.5V6. 20euro all 6 pieces, great deal. The original injector as you know flows 200cc, and this one flows 213cc. Both of them are 4 pintle caps, but the difference is that on the vectra ones the pintles are right "on top", while on the original the pintles are 2,5-3cm inside. So, besides the 13cc difference the spray pattern is definetly an improvement.

For these injectors, filing would not be a good idea at all. If I push the injector all the way in, until it reaches the plastic edge, the Oring is already inside the intake and does no seal anymore. My english is rubbish and I'm not sure I explained it correctly. To put it in another way, the distance between the oring and the plastic edge of the injector is larger than the thickness of the intake. So if you file the mounts enough for the intake to support the injector properly, the oring would "fell" in the intake valves chamber.

With the injector secured on the rail with that clip, there is the 2,5-2,8mm between the plastic edge and the intake. The washer is not necessary because the injector sits nice and fine on the fuel rail and is also secured, but because I'm paranoid, I added the 2,5mm washer to eliminate the possibility for the injector to go too deep, just in that one in a million cases the clip fails.

The result is quite good, much more low end torque, different sound of the engine, more relaxed overall. Would recommend the upgrade.