I'm putting my 850cc injectors in the primary rail and have a couple quick questions...

1) I can't seem to get the injectors to sit flush in the rail. The primary rail has been milled by KGparts to accept the 850cc injectors. If I remember correctly, the 550cc injectors sat lower without a gap at the top. I attached a pic to show what I am talking about. Any tips on getting the injectors all the way in?

2) I'd rather not run the diffusers/air bleeds if I don't have to. Are they needed to seal the primary rail? Or will the o-rings be enough? I was under the impression that the o-rings provided the main seal.

Thanks

 

Is there a chamfer on the top edge of the injector holes? If not you can use a file and just knock the edge down, this will allow the injector to drop the rest of the way in the rail. Before the rail was machined it had one there from the factory.

The o-rings that sit on the outside of the rail provide the seal, but we still prefer to use the diffusers for the primaries to help with atomization of the fuel.

 

Thanks a bunch. Looks like I need to file it out a bit, I forget the top was chamfered before milling.

*edit* The rail is chamfered a bit, but maybe it needs to be opened up a little more... We'll see.

 

So I think I am just going to leave it as it is...



Note how close the upper o-ring (green) is to the opening. I'd be afraid of leaks if I pushed it down any more. After some quick measurements, I *think* the lower o-ring is low enough to seal.

I'll just leak test it off the engine when I get everything back in the car.