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Injectors - choosing the right Design III (and some II info)

 
Old 06-01-2011, 03:25 PM
  #61  
dprantl
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Honestly, I am not sure. I have never seen the 968 injectors in person or tried to fit them. From Hilton's picture comparing injectors, they could be slightly shorter and may require slight fuel rail height modification.

Dan
'91 928GT S/C 475hp/460lb.ft
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Old 06-01-2011, 03:43 PM
  #62  
John Speake
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Tanks Dan, I'll stay with the 558 version.
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Old 06-01-2011, 08:09 PM
  #63  
Hilton
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Originally Posted by MG944 View Post
anyone know the p/n for 4 hole design III 19lb injectors? looking for them for a 944.
See post #14 - I bought a couple of sets of used ones off ebay (search for "0280155746") and some new o-rings/caps for them. The car is still in pieces while I wait on plating of parts.

Originally Posted by John Speake View Post
Thanks Hilton. Those numbers are for the old single hole pintle type, I think.

These are the ones with the 155 968 part #
http://www.blueovalindustries.com/en4540.html which are 4 hole from the pics.... I'm not sure what the Ford part number is...
John - I thought the 558 might be single pintle, but reading a few vendors adverts indicates they're 4-hole (at least searching by the Ford part number).

Dan thanks for chiming in - real experience is a good outcome I'll add them to post 14.

The xxx 968 part number is a design III missing the top groove for the injector rail clip - but it can be added with a dremel per Chris' work above.
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Old 06-02-2011, 06:13 AM
  #64  
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Hilton, Stan. many thanks. You are correct, I was wrong, the 558 is 4 hole. They seem to more difficult to obtain now, I wonder if they are being superceded. I have found a set though.

I glad I didn't order a set of 968 as I want them plug and play for the customer.
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Old 06-30-2011, 06:05 AM
  #65  
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The only sets of 0280 150 558 (FMS-M-9593-F302) 42# injectors that appear to be available now are of Chinese origin..... although an enquiry to Bosch this morning says they are available but at almost $100 EACH, even at trade price......

The default 42# that is now offered seems to be the 0280 155 968 as per this link
http://www.fiveomotorsport.com/bosch...ant-0280155968

Can anyone tell me whether these with fit, clips and all without modfication ? I am trying to buy a set for a 3rd party and I want them to fit out of the box, no problems.
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Old 06-30-2011, 12:28 PM
  #66  
Tim Murphy
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Originally Posted by John Speake View Post

The default 42# that is now offered seems to be the 0280 155 968 as per this link
http://www.fiveomotorsport.com/bosch...ant-0280155968

Can anyone tell me whether these with fit, clips and all without modfication ? I am trying to buy a set for a 3rd party and I want them to fit out of the box, no problems.
Hi John,
The new Gen 3 injectors you list here are the ones I currently use and they seem to work great.

The clips do not fit perfectly although would most likely work the way they are. The groove for the clip at the top of the injector does not go all the way around so the clip does not fully seat. It's a real easy fix, just take a fine toothed hack saw blade and cut the groove all the way around. Literally takes seconds per injector to do and the fit is perfect. There is a metal core once you cut through the plastic so it is real easy to feel when you have gone deep enough. You would have to be trying hard to mess one up.

You still need to change the lower o-ring to the larger size for the 87 and later cars. www.blueovalindustries.com has the best price that I have found $319.95 with free shipping, in United States anyway.

Hope this helps.
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Old 06-30-2011, 12:50 PM
  #67  
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Many thanks Tim that's exactly the information I needed :-)
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Old 06-30-2011, 01:02 PM
  #68  
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For what's it's worth, I was told by Bosch Technical that these are EVO 6.2 type injectors.
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Old 07-01-2011, 07:03 AM
  #69  
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Another question - what is the correct method to change the lower seals ? Does the green pintle cap have to come off first ? That appears to be the case.

The original seal can be removed with the cap in place, but there's no way the larger stiffer seal will go on with the cap there. I assume the cap is pretty firmly clipped in place to stop it becoming detached but I am reluctant to apply any great force to remove it.

Any advice as to the best method ?
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Old 07-01-2011, 09:08 AM
  #70  
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John,
We cut the existing O ring and remove it.
Providing you are using a Viton O ring it can be put in place without removing the pintle cap.
Get as much of the O ring into the groove as possible and then push the remainder over the pintle cap.
This is how we do it on the 19Lb and 24Lb.
Roger
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Old 07-01-2011, 10:14 AM
  #71  
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+1. Don't try to remove the cap, they like to break during removal.

Dan
'91 928GT S/C 475hp/460lb.ft
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Old 07-01-2011, 10:40 AM
  #72  
John Speake
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Thanks Roger and Dan for the quick, helpful replies.

I don't know the material the large seal is made of, it's the Bosch part.....
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Old 07-01-2011, 12:21 PM
  #73  
Tim Murphy
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I also cut the stock o-ring off. You can pry it off but cutting with a sharp utility blade works well.

The o-ring in the picture is Viton (std 928) and the stock one on the injector is Buna-n

FWIW, I have been using buna-n large o-rings on the new injectors which have been working great.
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Old 07-01-2011, 01:53 PM
  #74  
John Speake
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OK Tim, thanks for that reassurance :-) I just brute farces the large seal in place, that matrerial is rather stiff though.
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Old 07-06-2011, 02:58 AM
  #75  
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Sorry to bring up this old thread, but.

I was doing some fuel calculations and the 19 lb/hr injectors are barely enough for 300HP which needs 18.75 lb/hr fuel

I seem to be running lean under full throttle/high RPM and the FPR is at 65lb at a idle

What are your thoughts
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