Sup guys.
Last week I posted if I can buy 4G63 eclipse's injectors for our 420A engine to use without any modification, and Darkone said just change the O-ring. so I purchased the 680cc injectors and they arrived today!

They are huge (680cc!) But now I am looking at both of the tips of each injector, and they are totally different compare to my current injector for 420A. So do I just pull the o-ring out from my current injector and put the o-ring into my new set of injectors and it will work and not leak? (do I have to change both of the o-ring for each injector?)

Coz to me it seems like that even if I change the O-ring, the O-ring will not stay on there tight or the o-ring is possible to slide up and down. This is because from the pic, the current injectors I am using has a gap or grove on the injector's tip for the o-ring to go into, but my new 680cc injectors doesn't.

Any help will be appreicated. BTW, I am using the new injectors with the Megasquirt setup.

Check out the picture below, the 330cc is what I am using now on my eclipse, and the 680cc is what I just received for the MS setup.


Thanks!

If they are really ment for the 4G63 follow Dino's advice, and cram them in.

However, you should have bought the correct injectors so you wouldn't have to deal with cramming it in or having to worry about swapping rings.

But how do you know if they are right for our fuel rail? The only real fitment information I can ever find on any given injector is top feed or side feed, and not much about the style of O-rings they use.

They aren't. They are the wrong injector. It's a damn tight fit, but if you lube them up enough and manage to not pinch the rings on the way in, it works.

ok.. thanks !
I will give it a shot this weekend.