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SARD Injectors in at Last

Steve

By Steve,
in Engines & Forced Induction

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Steve Grand Master

Steve

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Gradenko, did you just damage the little feet that go over the pintle? cos if you did it would probably be ok to just trim them up and put them back in.

I cant see how they could possible do anything but protect the pintle when being inserted into the rail or manifold ( the feet that is). When I put in my sard ones they had no plastic pintle bits at all, just o-rings.

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Gradenko Mentor

Gradenko

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Originally posted by B-Man

What affect does broken pintle caps have on the injection system, pattern and flow ? ??

Yeah, its the bit that claws around the bottom of the injecter. A malformed pintle cap may not seal the lower o-ring to the fuel rail and that would let fuel leak into the inlet tract. Doesn't affect flow or spray pattern at all.

Steve, i think your right about the claws, they don't have much of a part to play in sealing the o-ring. A bit late for me to put the old caps back in. Their all gone now :). I didn't like how brittle the old pintle caps were, they could have come apart in the inlet tract at anytime and caused the injectors to leak, so I asked the guy to replace them all.

I had a few broken claws before I removed the injectors. I think combustion temperatures would have made short work of any rogue plastic bits. I remember reading a column in Wheels where the author told us about the time a mouse ran up his workshop mechanics leg, up his back, over his shoulder, down his arm, down a screwdriver and into the open carby he was working on. The engine gave a quick miss and splutter and returned to a solid idle like nothing had happened ;).

Steve, if the Sard injectors didn't come with caps, that could be the reason Inasant and yourself were having trouble with them leaking. Was there an indent after the lower o-ring for a pintle cap to sit on?

Steve Grand Master

Steve

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No indent. The pintle acutally protruded further than the stock one does. the leaking problem was definately the fault of the undersized o-ring provided. The injectors themselves sat quite firmly in the rail, and had to be pulled down with the injector cap screws.

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