i have 89 XJS V-12 are there a maker of fuel injection harness. and other engine bay parts?

 

There are, but my experience is that you can do it yourself just as well for loads less. Several posts concerning this....

 

But the connectors off eBay..... About $2 each. Remember to get 14 if you have cold start injectors.

High temp wire. A weekends work. Quite rewarding.

 

here is how i made my loom
https://www.jaguarforums.com/forum/x...ctures-127573/

just take your time and do lots of research

if your in a real pinch , i could make one for you


BB

 

I was wondering if someone could explain something to me, if the injectors are firing in banks of four, I assume that means that three fire off at the same time - what happens to the fuel for the two cylinders that don't have a spark.

I would be thankful if someone could post an image of where the wires are spliced together.

 

it stays in the induction system for a fraction of a second until the next cylinder uses it,

this is a wasteful system compared to sequential injection , but was current technology at the time

so that one of the reasons we get low MPG from our wonderful V12's

BB

 

Thanks for the reply, it's something that I have not seen explained before.

Further to the wire splicing, I had another look at Bernard's website and saw it was as simple as it sounds.

Coxy

 

Out of curiosity, is your car a Marelli ignition car? Not a bad idea to build both the ignition, and the injection harnesses while at it.

I'm sure your car does not have cold start injectors. I think these went away in 1986?

 

Actually BB, I bravely disagree. Sequential ignition, if I remember correctly from Roger Bywater's book, would make naff-all difference to the fuel consumption of the Jaguar V12. Essentially at, say, even as low as 2000 rpm, the timing of the injector pulse is, on our V12 engines, immaterial to consumption. The poor fuel consumption is a function of other factors: combustion chamber design, rotating mass, autobox, body weight, over-square cylinder/piston, etc etc.

Greg

 

lol

better explanation than mine.....

i just did a quick google search , but i didn't read all the relevant info , lol



google , everyone can access it........just got to make sure you can understand what your being told, lol

BB ;-)