fuel injector - what thread form is it?

[magpies]

looking to fit an additional injector in the plenum - anyone know what size the thread is?

[Slinky]

Go on, give us a clue..

[magpies]

I have a 24v cossy to put in my TVR S2 and looking to fit a 7th injector in the front of the plenum activated only on full throttle (using the car in competition)

[eliot]

injectors are usually a push fit?

[magpies]

are they?

[stevieturbo]

magpies said:

are they?

Petrol ones, yes.

[Pumaracing]

Jesus, the misinformation in this forum is staggering. As any fule knows the injector thread for standard Bosch petrol injectors is 14mm x 0mm metric fine.

Get yourself down to your local engineering tool supplier and ask them for a 14mm x 0mm tap. They'll probably have one in stock. The tapping drill size is 17/32" so buy one of these too. While you're there you can pick up an imperial adjustable spanner to complement the metric one in your tool box.

[magpies]

THANKS _ FFS it is the FIRST petrol car I've worked on with injection - if that are push fit then fine - I have not taken them the fuel rail off yet - so do I just pull them or what !!!!

Be a bit more helpfull when someone obviously is asking for advice 'cos they don't know but WANT TO LEARN

i if there were a smilie showing you the fingure I would have used it

[magpies]

Pumaracing said:

Jesus, the misinformation in this forum is staggering. As any fule knows the injector thread for standard Bosch petrol injectors is 14mm x 0mm metric fine.

Get yourself down to your local engineering tool supplier and ask them for a 14mm x 0mm tap. They'll probably have one in stock. The tapping drill size is 17/32" so buy one of these too. While you're there you can pick up an imperial adjustable spanner to complement the metric one in your tool box.

and if you (pumaracing)allowed private messages I would have sent you one - asking for the correct answer instead of the arrogant drivvel you posted this time

how are they kept in (presome O ring but don't know)

This is supposed to be TECHNICAL section - so no F~ckwwitt answers

Edited by magpies on Saturday 14th May 21:10

Edited by magpies on Saturday 14th May 21:17

[stevieturbo]

TBH, for the most part it is quite obvious how they are held in when you look at them.

I assume you have actually looked ?

There is an inlet manifold on one side, and a fuel rail on the other. Both of which are bolted together. It would be rather difficult for the injector to go anywhere.

[magpies]

stevieturbo said:

TBH, for the most part it is quite obvious how they are held in when you look at them.

I assume you have actually looked ?

There is an inlet manifold on one side, and a fuel rail on the other. Both of which are bolted together. It would be rather difficult for the injector to go anywhere.

Thanks Stevie - That was it - when I looked at the set up - remember it is the V6 24v - all I could see was fuel rail an below it the jumble of injector bodies and the electrical conections - I thought about taking the fuel rail out but wanted a bit more info before I did it so I did not end up with springs and things flying about.
I now need to talk to someone who has fitted an extra injector into the plenum and how it was located. Probably a push fit with O ring will be ok as it never pressurises above atmospheric (not turbod).

[GavinPearson]

I would love to know why the OP wants to fit an extra injector.

Is the engine modified, is it running lean at high rpm & WOT?

How do you propose to fire the injector?

You might find that all you need to do to fix the issue you think you have is change the fuel pressure regulator & the fuel pump.

[Pumaracing]

GavinPearson said:

I would love to know why the OP wants to fit an extra injector.

I'd suggest being mindful of the old saying "be careful what you wish for, you might just get it."

Then there's that other one about a can of worms or summat but I can't quite remember how it goes.

[Pumaracing]

magpies said:

and if you (pumaracing)allowed private messages I would have sent you one - asking for the correct answer instead of the arrogant drivvel you posted this time

how are they kept in (presome O ring but don't know)

This is supposed to be TECHNICAL section - so no F~ckwwitt answers

Oh oh - hissy fit alert. Anyway SFB's, I was mainly having a pop at Stevieturbo for his usual crap advice saying petrol injectors are a push fit when he knows perfectly well they're a 14mm x 0mm metric fine thread. I ought to know. I used to make my own range of billet aluminium throttle bodies. We always used to make the injector holes with a 14mm x 0mm metric fine tap - or milling cutter as they're known in the trade.

Anyway, anyone know where I can buy a spare bubble for my spirit level?

[Stu R]

[magpies]

thanks - so at least I know it has to be a 14mm milled hole

yes it was a hissyfit as I was getting 'OOOOOOOOOooo lets take the pissss out of someone asking for advice cos he doesnt know'

however I'm over that now

my next port of call is to seek comments regarding what the extra fuelling will do - as all I have is word of mouth from a couple of lads that did this to their rally car and say it made more power although they never quantified it or put it on a rolling road - so I'm taking it with a pinch of salt.

[eliot]

Simply search google for fuel injector and it should be fairly obvious why we are having a jest:

http://www.google.co.uk/search?tbm=isch&hl=en&...

[Simon says]

Why? why not just modify the stock Ford EEC IV fuel injection for more fuel at the top end than fit a crude 7th injector with its poor fuel distribution and all or nothing operation? the 7th injector was a popular mod on K/KE Jetronic Bosch systems some time back to get round its deficiencies but your Ford ECU is far far more advanced than this system in fact this was cutting edge fuel & spark engine management back in the day most unusual for Ford possibly a throttle controlled switch-able resistor inline with the ECU coolant temperature probe/sensor wiring thus increasing fuel when necessary or an after-market fuel pressure regulator why the extra fuel?

Edited by Simon says on Sunday 15th May 10:01

[magpies]

Cheers
after a few Goooogles and some further reading I don't think I'll be going any further on this subject.

[stevieturbo]

magpies said:

my next port of call is to seek comments regarding what the extra fuelling will do

It could make your engine run like st unless you actually need it.