radkins

I am looking into upgrading my primary injectors and was wondering if anyony has used the 850's in the primary slot? I have already replaced the secondaries with 1600's, so these are just lying around. Also any thoughts for or against boring the stock 550's to 850's.

Thanks

duboisr

That is what most people do . The fuel rail needs to be cut down from the top 1/8 inch ( .125 thousands ) .Garfinkle has a holder he uses to do it in a mill . New O -rings will be nice, and you should remove the bottom of the defusser in the secondary injector holes as the larger injector may break if off from the extra force . Leave the ones in the primary holes alone so the idle will be good .

LetsGO7

iTrader: (2)

bring the thread from the dead....

i don't get about the milling down part...does someone a pic of before and after the milling?

Thanks

-joe

radkins

The primary 550's are taller than the secondary 850's, so you need to mill down the top of the rail so the secondaries will sit down far enough to work. Garfinkle did mine and even sandblasted the rail so it looks new.

pp13bnos

iTrader: (1)

http://www.newwave.net/~flanham/wlan...el/850pri.html

This is the way I did it. Seems to be working fine for me. CJ

rx7raca

i dont get where you mill, you say on the top of the rail?
take a picture of the rail and show where you mill down. its kind of hard to figure out where you exactly mill out.

2manytickets

get a second 0-ring from the parts store to seat the original one lower, and your fine. costs like $0.40

LetsGO7

iTrader: (2)

i rather mill it down....i didn't know that the 550's are taller...make sense now....i guess you mill down the rail's surface where the injector end cap would come in contact with...

thanks guys!

-joe

p.s. if i'm wrong, tell me!

pomanferrari

iTrader: (1)

Duboirs,

How much does Garfincikle charges to mill the primary rail down?

I have a spare primary rail I can send to him for milling. Please let me know.

Also, you said:

you should remove the bottom of the defusser in the secondary injector holes as the larger injector may break if off from the extra force . Leave the ones in the primary holes alone so the idle will be good .


I'm not clear on the above. You remove the diffuser in the primary rail, put the 850cc into the primary rail but then you said leave the ones in the primary holes???

duboisr

If you go to 1680 cc sec injectors then you remove the bottom of the plastic thing . Leave the one alone in the primary hole with the 850 cc .I think if you have his engine torque brace the milling cost shipping . If you do not the cost is $ 5.oo plus shipping .

duboisr

Letsgo7, You mill the top surface of the rail where the four screw holes are .

LetsGO7

iTrader: (2)

i thought that's how i understood it....i guess my english sucks....

thanks

-joe

rx7raca

ya thats what i thought, do you know how much you have to mill it down?

duboisr

rx7raca You mill off 1/8 inch ( one hundred twenty five thousands of an inch ) .

ghostrx7

You dont really have to mill it down, I also just added another o-ring, and so far its been problem free. BTW thanks for that website faq. really helped me out.

duboisr

Another o-ring = another chance for a failure when the wrong type of rubber gets fried from the heat .The proper type of rubber should last as long as the ones the factory uses but they get brittle as well .Milling is inexpensive with no more risk than using stock o-rings .

pomanferrari

iTrader: (1)

duboisr,

Can you give me garfinkle address and exact cost of just milling the primary rail for 850 cc injectors and shipping cost.

Thanks.

duboisr

Call ups for cost of shipping as I am not in the shipping business and can not even guess, sorry.The cost of milling the rail is five dollars and some of that is for time to travel to the shipping store .If you handed it to him the cost may be a hamburger . you are welcome to call him at 615-893-4469 for info .

guner

You are all making this more difficult than it needs to be. I bolted the primary rail to a block of wood (using the mounting holes) and c-clamped the block to my deck steps. I then used a belt sander and grinded the seating surface down an 1/8th of an inch. I periodically stopped and inserted the old 550's in the hole until I got 1/8th inch gap (use a feeler gage). Cleaned the rail thoroughly, installed the 850's, pressurized the system and luckily no leaks. Yes I felt like a redneck doing this, but I think that for the most part we rx7 people tend to want to over-engineer things. Fact of the matter is, the wankle is still a combustion engine and sometimes good old NASCAR engineering is still authorized. Good luck and I'll let you know when my car burns down.

regards,
guner

rotarypower101

iTrader: (1)

Probably not a good idea, as going to far or not enough can cause the injectors rings to leak.
And I hardly think that 5 bucks is going to set anyone back, and the piece of mind that things are done correctly is nice.
hell i will cut them for free if $5 is too much for you.

HeatTreated

Dont waste your time boys.. Just get some upgrade your secondarys (1200,1300,1600)

truss me

Snook

iTrader: (12)

most people are doing this with also upgraded secondaries. Lets hope 850s for all 4 isnt enough fuel for most peoples power needs

ive got 1300s and 850s and worrying ill have to upgrade further

widebody2

yanni, max cooper has a site...i don't feel like looking it up for you (sorry) but there is a fuel calculator on there that will tell you what power your fuel setup is good for. I am using the same setup as you and when I did the calculator it was a pretty high power level for 85% duty cycle...maybe high 400s low 500s. What power are you aiming for?

Snook

iTrader: (12)

515rwhp or so is my goal and ill be at around 95%duty cycle im not sure if thats ok but I think so.

Here is for our injectors
850 1300 4300cc 550rwhp@100% 465rwhp@85%

jspecracer7

lmfao. I still think I gotcha beat. Kid I knew wanted me to do this for him so I told him to get me some sandpaper and I'll come by and do it for free. Drove 45 minutes to his shop to find out he had no sandpaper...but he had the rail out so we took his SKATEBOARD and rubbed off 1/8th of an inch of aluminum on this his board...worked fine too.

...Now THAT'S ghetto.