fastyoungone

I have another primary fuel rail and a set of 850's. I am currently running a single setup with a To4, 60-1 1.15 a/r., a pfc, walboro, blah blah blah. But I am still running stock fuel(at very low boost, 10psi). So I might as well take the old ones and have them milled. My question is, when ppl talk about milling the primary fuel rail for the 850's, I am not sure why. Are the bases of the 850's larger and the rail needs to be milled for them to seat properly? If so, is it for depth, width? Also I have heard about double grommets? I need some advice on this. PLEASE ONLY ANSWER IF YOU HAVE DONE THIS AND HAVE SUGGESTIONS AND ADVISE. THANKS

Buzzardsluck

you mill so the injectors sit futher down making a (better) seal, double orings are supposed to do this also but i milled mine.
searching is where i got my information from

Xeros

Have indeed dont this runnign a set right now. You mill the top of the rail. I did it with a file haha. Took a while but came out much better then my first attempt. Over heated and warped the rail. Its done because the 850s if you noticed are a waaaaay shorter then the 550cc so you have to mill it down it order for the tips to seal properly. You can do double grommets but thats your call. All of these hoem made solutions alwayS HAVE 50/50 OUT COMES. Becasue they are home made.

GoRacer

iTrader: (2)

There is a cap that screws on the top of the rail. It keeps the injectors snug. Since the 850's are shorter, the cap won't keep them snug. You shave the top down the the cap seats lower, thus keeping the 850's in there nice and snug. I also bored down the cone inside the rail, so the tip would be further down as well. This was just to ensure the spray pattern would be outside of the rail.

slo

iTrader: (1)

there was someone milling them down for like $10 plus shipping both ways, I searched but couldn't find anything.

anyone know who that was?

fastyoungone

Ok so what you are saying is that I need to mill down the top of the fuel rail underneath the cap so the injector will seat farther down in the rail. Are the screw holes deep enough to get a tight fit, or do they bottom out if I go to deep? Also, what is too deep, or how far do I need to mill it down? Thanks alot guys this is helping a bunch.

Buzzardsluck

thats a secondary rail. you REALLY need to do some research or have ashop do this for you.

Mistakes and fuel systems don't go together well.

Jesus ******* christ at least glance at the FSM.

fastyoungone

Thank you buzzardsluck for your mature response and courtesy, and answering my questions. I know what it is. I used the primary for the example because it is much easier to see and it is essentially the same thing. The principle is the same is it not? Did you read what I said underneath it? Do you or do you not need to mill down the upper part of the rail underneath the clamp that holds the injectors down? I kind of need to know what to tell the shop to what to do don't I so they mill the proper spot? So now that we have a useless post from our above friend here, can someone plz answer my questions now?

Am I on the right track as far as where to mill( on the secondary rail, yes I know)
Are the screw holes deep enough that the screws dont bottom out, or do I need to buy longer screws?
How far am I supposed to mill?

Thanks guys!

BlueTII

Take off .125 off the top of the primary rail.

fastyoungone

Thanks BlueTII!! So I guess I will have someone mill it down about .125 inches and slide those bad boys in there and get to work!!!!!

M104-AMG

iTrader: (8)

Yes, and the screw threads are deep enough.

Please take it to a machine shop to do. Make sure you clean out all the metal shavings; use new Mazda O-rings (IMHO, they seal better) or if aftermarket, VITON metric O-rings.

If you haven't changed out the pulsation dampener or the fuel lines in 3-years, I'd replace them with new updated factory parts as well.

Good luck, and be sure to get all your initial tuning numbers ready, otherwise you won't be driving her . . .

:-) neil

gracer7-rx7

iTrader: (16)

I think GothamRacing.com sells a properly milled primary rail.

mono4lamar

iTrader: (32)

I think his response was proper till faul language was involved... You posted a picture of the secondary rail! Your asking about milling the primary rail to accept secondary (850cc) injectors.

Anyway the process is VERY SIMPLE. Mill an 1/8 inch off the top of the rail. Bing, bang, boom... YOUR DONE!

Just bring it to any machine shop and tell them to take an 1/8 inch off the top.

fastyoungone

Great. It really doesnt seem like it is all that much work, pretty simple actually. Does anyone that has replied to this happen to have a map for a mild street port single with 4x850s? Oh and one more question, are all the injector clips the same?

fastyoungone

Well it is the same process and I thought that that would be easier to work with. Guess next time that I will have to make sure and state previously what my intentions were. I apologize. Thanks for all the help guys. The clips are the same right?

GSLSE20B

yes the clips are the same

fastyoungone

SCHWEEET!!!! Coverd alot of good stuff in this thread that I hope people can use in the future.

Buzzardsluck

Thats been covered before, how do you think I find out about it?? My foul language comes from me having a foul mouth and irratation towards people not trying to answer their own questions. Ill try to reign my foulness in, in the future.

My friend saw my replies and thought I was going soft

GoRacer

iTrader: (2)

You may also want to get new screws. You will have to crack them loose with pliers or vise grip. If they are too stubborn, then have a second person turn with a philips screwdriver and hold the rail in a vise while you use the pliers.

GARCO MOTORWORKS

I mill the rails for $5 plus shipping .

r0gu3

https://www.rx7club.com/showthread.p...=primary+850cc

Who would have thought people have been repeatedly asking this question for 5 years? You make reference to people using this thread in the future yet you didn't look to begin with. There is good stuff in many threads, JUST LOOK!

I can completely relate with Buzzardsluck as no one seems to make use of the wonderful resources this forum has to offer.

rxrotary2_7

We will mill it down for $5 plus return shipping if you are having your secondary injectors cleaned and flow tested at the same time. (always wise to have them cleaned before installing)

http://kgparts.com/index.php?page=fuelinjectclean