Top feed injectors and greddy manifold

[MoogLe]

So i was installing my RC injectors in my new greddy manifold today and ran into some confusion

how far in are the injectors supposed to sit in the manifold?

look at the pictures



is the rc injector supposed to sit flush with the big oring and stick out inside the manifold like the stock injector?

cause the bottom doesnt clear the hole in the manifold, the hole needs to be like half a mm larger for it to go through

is it supposed to be this way or do i need to make the hole a little bit bigger?

the injectors are VQ35DE injectors which may explain the inconsistency

[Darius]

Drilling out the manifold shouldn't hurt anything, just don't go any bigger than you have to in order for it to slip down in there.

[240z4u]

That is exactly what my manifold looks like with the top feeds installed. I haven't had any problems.

Evan

[Darius]

The concern is with not having the injector seat onto the rubber grommet to hold it down. Under boost, pressure pushes against that grommet and if the injector is not butted up against it to keep it from popping up, it could become a boost leak.

I assume that since you're using RC injectors that you'll probably go to them for your next set if you ever decide to go bigger. But if you ever think you'll sell the intake manifold or switch back to injectors that actually fit, I'd think twice about drilling out the manifold.

[240z4u]

FWIW the base of those injectors are big enough around it actually compresses the gasket and seal. I have been running like that for years at 25 or so PSI with no boost leaks.

I see what your saying though, but they essentially end up smashed in place LOL.

I don't think it is a good idea to drill out the manifold for reasons Darius stated above.

[krayton]

isnt one of those side feeds not sitting its in side feed rail? thus it sitting farther down?

[Darius]

Yes you're correct. I noticed that, but didn't point it out because I wasn't sure of the amount of difference that the fuel rail would make. I'd guess it to be a few mm's. I tried looking for pics of my own but my work computer has a limited project pic inventory

Evan- werd to your mother.

[MoogLe]

thanks for the responses guys

since there are people running it this same way, i'll stick to it

everything is mounted up nicely and ready to go!

[StricNyne]

rezzz the dead here. how did this work out for you ?

[MoogLe]

wouldnt know cause i havent started the car yet lol

will be starting in about another week or two

[StricNyne]

ahh its you, i have same rail and same inj, but mine stick up a lot more cause instead of rubber inbetween manifold and inj i got a metal coller but mine are wrong size, do u have a part number for them ?

[MoogLe]

part number for what? the rubber spacers?

i reused the ones from the stock manifold

[meet07]

I was gonna say try to use some petroleum Jelly on the orings that sit in the manifold but seems that everyone else is ok...

[StricNyne]

i dont have them lol