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Injector replacement and what not to forget...


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  • Gold FFM
7 hours ago, Mysterae said:

What was the reason for replacing them? Reliability, performance or the old ones just getting old?

I know that 'if it ain't broke, don't fix it', but she's pushing 95k miles, there's a noticeable amount of soot coming out the exhaust and the idle is quite lumpy (cycle by cycle variation). Also I wanted to take my maintenance experience to the next level :) (I don't have much of a history of working on cars). Looking forward to seeing what the effect on performance is though, shame the weather is forecast to be biblical today, will have to wait.

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It sounds smooth indeed, the engine doesn't move much

 

Could you have a look at the original injectors filters please? I would like to know their dimensions so that would be nice if you could pull them out of the injectors (but I think the basket filters will be good for nothing after that so if you want to keep them that's not a good idea!)

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PS: if you intend to bin them I might be interested to have them to have a look before I do anything to mines (I don't really want to remove them from the car before I have the seals & new basket filters)

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For those interested, here the spec of the SJS supplied (RC) injectors. Don't know how they compare to stock performance (S4), anyone?

image.thumb.png.8f5e475348687bf45a3f02e855801b8d.png

 

At lest all four spray patterns are "Excellent" :) 

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I’m now somewhat confused after hunting for injectors.

what @RobinB5 has are PL2-320 rc units as can be seen on the spec sheet and the injectors.

Here they are - listed as Elan units?.

https://www.fuelperformance.co.uk/index.php?route=product/product&product_id=13296&search=Pl2-320  

they are suggesting Esprits are PL2-370?.

https://www.fuelperformance.co.uk/index.php?route=product/product&product_id=5074&search=Pl2-370
 

so what are the originals - 320 or 370cc ?

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Well could have been imaginary wishful thinking for sure. Certainly felt totally different though.

But they're being sent back for a refund, the supplier can't provide the PL2-370s. Caveat emptor.

Edit: apparently they should have sent 370s, now being sent back for replacement!

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This sort of thing really boils my p£ss.

correct items ordered from a well respected specialist. Had @RobinB5 not sent me pics of these - no one would ever have known these were wrong - with the very real potential issue of that engine running lean and a costly rebuilt.

absolutely abysmal. for the record the post above referring to SJS as the supplier is incorrect - it’s not my place to name the actual supplier though.
 

save yourself using the specialists and buy direct from the uk source

https://www.fuelperformance.co.uk/index.php?route=product/product&product_id=5074&search=Pl2-370

 

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The RC Injector flow check is performed at 43.5PSI, so that 320cc/min relates to that reference pressure.    What fuel pressure does the 4-cylinder car run?  

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1996 Esprit V8, 1998 Esprit V8 GT, 1999 Esprit S350 #002 (Esprit GT1 replica project), 1996 Esprit V8 GT1 (chassis 114-001), 1992 Lotus Omega (927E), 1999 Esprit V8SE, 1999 Esprit S350 #032, 1995 Esprit S4s, 1999 Esprit V8 GT (ex-5th Gear project), 1999 Esprit V8SE ('02 rear)

1999 S350 #002 Esprit GT1 replica

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So if ~360 cc/min is required with the PL2-320 injectors I'd need ~49 PSI pressure in the rail (assuming linear pressure vs flow rate). This is on the upper side of the quoted pressure range. So safer going for the 370 cc/min injectors as I assume it's better to have the capability for greater fuel flow rate as opposed to less?

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