Primary Injector Dimensions

[sailorbob]

Does anyone have a primary injector that they could check the dimensions of please? I have some notes of the following but don't know where they came from:

Length between O rings - 74 mm

Body maximum width - 24 mm

O rings - 14.5 mm

[Chillidoggy]

Yes, if you can wait until tonight. I have a complete set of 6 in the garage.

[sailorbob]

That would be great, thanks Ian 

[Chillidoggy]

I've just unpacked them but I don't know which are the primary, and which ones are the secondary injectors. I bought them with a load of other stuff from Nigel here on TLF when I first bought the car, and they've been in storage ever since, so I've never looked at them.

 

They all measure up the same, anyway.

Length between O-ring groove centres - 67.5mm (tricky to measure that one)

O-ring outside diameter 14.5mm

Overall body diameter - 24.5mm

 

Now I just have to find out which ones are which -

 

 

 

 

Edited September 24, 2015 by ian29gte

[Vulcan Grey]

the secondaries normally have the blue clip at the top.  Yours appear to have 4 with blue and 2 without...  

 

Edited September 24, 2015 by Vulcan Grey

[Chillidoggy]

the secondaries have the blue clip at the top.

 

Ive just checked, and there are four with blue clips, and two without. That's four secondaries and only two primaries?

[Vulcan Grey]

The secondaries on my 89SE look like this.  The primaries look the same except for the blue clip.  The bottom of the injector is shiny rather than black. 

 

I also measured mine at 67mm o-ring to o-ring.

 

 

Edited September 24, 2015 by Vulcan Grey

[sailorbob]

Thanks to both of you. Measuring the injector resistance will soon reveal which ones are the primaries (2 ohms +/- 0.1 @ 60 deg C) or secondaries (16 ohm). They should also be etched with the Rochester part numbers; primaries 5235364 and secondaries 5235434.

[Chillidoggy]

And thanks for that info too, chaps.

 

I shall have a measure up, and report back, someone else might find the info useful.

[ragingfool35]

here you go

lotus Esprit injector dimensions.xlsx

[Chillidoggy]

For anyone interested, the injectors with the blue and black rings are indeed the primaries, and are etched 5235364, the ones with the double black are the secondaries, etched 17985543. Note, these are for my S4s.

The primaries all measure 2.7 ohms, the two secondaries both measure 16.8 ohms. The temperature is about 14C, rather than 60C, however.

[sailorbob]

Thanks Chris.

Ian, those primary injector resistances are high, especially as resistance increases with temperature.

[Chillidoggy]

Thanks Chris.

Ian, those primary injector resistances are high, especially as resistance increases with temperature.

 Yes, they are. Although they are all the same, which makes me less nervous. I'm going to measure them with another meter in a while.

i had thought about sticking them in the oven at 60C, and then measuring them, but the missus is home now, and I reckon I've missed the opportunity.

[Chillidoggy]

Just used my other, newer, test meter and I'm getting 2.1 ohms for primaries, and 16.1 ohms for secondaries. I've checked a primary and a secondary on the car itself, and the readings match those. So I reckon they're all good.

Edited September 25, 2015 by ian29gte

[Jeremytb]

On ‎25‎/‎09‎/‎2015 at 17:09, ian29gte said:

Just used my other, newer, test meter and I'm getting 2.1 ohms for primaries, and 16.1 ohms for secondaries. I've checked a primary and a secondary on the car itself, and the readings match those. So I reckon they're all good.

Was this a new set of SE injectors?  If so can you let me know where you got them please?

[Chillidoggy]

On 28 September 2016 at 06:13, Jeremytb said:

Was this a new set of SE injectors?  If so can you let me know where you got them please?

Maybe someone else could answer this, as the ones I have are all used.

[Jeremytb]

1 hour ago, ian29gte said:

Maybe someone else could answer this, as the ones I have are all used.

I really only need 2 of the original type injectors as 2 of mine were ok. If anyone has replaced a set and still has the originals I'd be interested in buying them. 

[Dave Freeman]

Just checked Jeremy and I have afraid I must have exchanged mine rather that buying a new set, has anyone managed to find one or two to replace your failed injectors

 

DAVE

[Jeremytb]

28 minutes ago, Dave Freeman said:

Just checked Jeremy and I have afraid I must have exchanged mine rather that buying a new set, has anyone managed to find one or two to replace your failed injectors

 

DAVE

Thanks Dave. I've ordered 2 from a guy in Germany who was advertising on eBay. Fingers crossed I can make up a set of 4. 

[Dave Freeman]

Ok, let us know how you get on.

 

dave

[sailorbob]

A correction to the O ring size; they have approx. an 8 mm internal diameter and appear to have a cross sectional diameter of 3.53 mm.

These have a larger outside diameter than the more common 14.5 mm O rings because the injector O ring bore in inlet manifold is approx. 14.12 mm.

They appear to cross reference to a variety of Buick, Chevrolet, Oldsmobile and Pontiac vehicles.

[Chillidoggy]

On ‎29‎/‎09‎/‎2016 at 22:25, Jeremytb said:

I really only need 2 of the original type injectors as 2 of mine were ok. If anyone has replaced a set and still has the originals I'd be interested in buying them. 

Ah, OK, now I understand.

I have a complete set of used originals, but I don't want to split the set, so I hope you get sorted.

[Chillidoggy]

1 hour ago, ian29gte said:

Ah, OK, now I understand.

I have a complete set of used originals, but I don't want to split the set, so I hope you get sorted.

 

Do I recall somebody here suggesting an upgrade for the standard injector set with an improved spray pattern? Travis? Derek?

[Jeremytb]

2 hours ago, ian29gte said:

 

Do I recall somebody here suggesting an upgrade for the standard injector set with an improved spray pattern? Travis? Derek?

I think I'm sorted for now - just got to try to make up an injector tester to work out which ones are good.  Does anyone know off hand what the rail pressure should be?  I'm hoping to then run them one at a time and match up the ones which have similar flow rates for a given pulse stream.

[Jeremytb]

I made up an injector tester out of a weed killer sprayer and drilled in a tyre valve as this could easily take 2 bar. I also brought an injector electrical tester which pulses them in different modes. I tested the 10 I now have acquired and found 6 that work and seem to deliver the same amount of fuel over 10 sec. 

4 are back in the car and it is running better than it ever did with the Five-O injectors. 

IMG_4290.mp4