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914World.com _ 914World Garage _ injectors cap styles

Posted by: Valy Aug 10 2011, 10:36 AM

I've seen 2 different cap styles on injectors.
Is there any difference in performance between the 2 styles?
Those are L-Jet injectors that are lower flow than the D-Jets but I don't think L-Jet or D-Jet makes any difference on this topic.
Attached Image

Posted by: type47 Aug 10 2011, 11:55 AM

I don't know; I was searching around for injectors and info on flow rates for injectors and found little difference in flow rates, in fact, one site listed the same injector for a 1.8L and 2.0L engine (albeit, the engines were L-Jet buses). I wanted to swap 914 1.8 injectors for a Vanagon 2.0L L-jet while the bus injectors were out for cleaning and flow testing.

Posted by: john rogers Aug 10 2011, 12:40 PM

If I remember correctly the nub on the cap of the upper injector in the picture causes the fuel spray to start lower in the chamber and results in a less efficient fuel spray pattern and a slightly lower horse power rating from the engine. I think the large cap on both is the same diameter and also the same length? You could measure them to be sure.

Posted by: Drums66 Aug 10 2011, 05:14 PM

........Ljet bus injector's.....don't know flow rate?
they will work in Ljet 914!

Posted by: Valy Aug 10 2011, 07:35 PM

Those are injectors from my 914 Ljet. They all work fine except that are too dirty so, I want to send them for cleaning.
I just want to use the opportunity to put the same caps on all of them and was asking if there is any performance benefit from one cap or the other.

The additional tip is hollow so it's there just to protect the injected stream from the air-flow in the manifold. I don't know if that helps or not since newer injectors don't have that anymore but, the lip is there for a reason

Posted by: draganc Aug 10 2011, 09:44 PM

Have a look as well at following topic:

http://www.914club.com/bbs2/index.php?showtopic=188933&st=0&p=1096060&#entry1096060

Regards,
Dragan

Posted by: SLITS Aug 10 2011, 09:47 PM

The caps are there to protect the pintle ... nothing else!.

Posted by: McMark Aug 10 2011, 10:30 PM

it's what's up inside the injector that makes a difference between 914 injectors and modern injectors. Bottom line, run either one as long as the flow rates are correct.

Posted by: Mike D. Aug 11 2011, 07:40 PM

I ran my last 4 cyl. car with Jaguar XJ12 injectors from the junk yard. The XJ was 6 liter I think, so four cyl. would be 2L. Didn't check the flow rate, tho.

Posted by: Valy Aug 11 2011, 09:34 PM

Of course it run with the Jag injectors. They have the same flow.
My question is not about flow at all.

I'm asking about the Injectors CAP style.
Which of the two caps is better for performance? I have the opportunity to choose whichever I want but can't make an educated decision.

Posted by: SLITS Aug 12 2011, 07:12 AM

Well then, the best course of action would be to run without the pintle cap at all. Spray pattern is determined at the nozzle, not the protective cap. If the cap had anything to do with it, it wouldn't pull off easily. The spray created would push the cap off and be melted in the combustion chamber.

Of course, you might just damage the pintle on installation, junking the injector.