2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

KGPARTS primary fuel rail

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Old 06-24-08 | 10:46 AM
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KGPARTS primary fuel rail

Anybody using one?

Just want to see\know how did you set the injectors on the center iron. KGparts sells an injector spacers, but they didn't fit on the stock injector holes
Old 06-24-08 | 10:52 AM
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not quite sure what you are asking.....what style injectors are you trying to use?
Old 06-24-08 | 10:52 AM
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you'll probably have to rig some **** up man

I don't know about on the FD, but on the 2nd gen KG rails are very annoying to install because they come with no mounting hardware. I have the secondary rail and it took me a long time to figure out that I needed to stack two washers and use allen bolts of a certain size to make everything fit.
Old 06-24-08 | 10:56 AM
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there is a little black piece (its stock) that you need to keep. If you don't have it the rail wont mount properly. Here is the link to what it looks like.

http://www.mazdatrix.com/c-6.htm All the way at the bottom of page.

It's called the "Fuel Rail Spacer / Insulator"
"This is simply the plastic spacer that goes under the primary fuel rail for 86-92 where it bolts to the center housing. The rail will not seal correctly to the top of the injectors without the spacer. This is another part that likes to "disappear" during engine work."

here is a reference picture


Last edited by 88t2romad; 06-24-08 at 11:02 AM.
Old 06-24-08 | 01:30 PM
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Originally Posted by 88t2romad
not quite sure what you are asking.....what style injectors are you trying to use?
850CC Bosch style injectors.

Originally Posted by arghx
you'll probably have to rig some **** up man

I don't know about on the FD, but on the 2nd gen KG rails are very annoying to install because they come with no mounting hardware. I have the secondary rail and it took me a long time to figure out that I needed to stack two washers and use allen bolts of a certain size to make everything fit.
I did, but I was hoping not to; when I purchased the KGPARTS injector spacer.
http://kgparts.com/index.php?page=diy


I was able to find the hardware fairly quick, however the bottom section of a bosch style injector is different than the OEM style; so the OEM diffuser + OEM air bleed + OEM spacer + OEM injector grommets don't work.

I thought that with the KGPARTS spacer, all I had to do was leave in place the OEM diffuser (and remove everything else) + the KGPARTS spacer; and then install the bosch style injector and fuel rail. Unfortunately, the KGPARTS spacer did not "drop in" into the injector holes. I think the injector spacer, needs to be pressed (or hammer in) into the center plate injector hole

Originally Posted by 88t2romad
there is a little black piece (its stock) that you need to keep. If you don't have it the rail wont mount properly. Here is the link to what it looks like.

http://www.mazdatrix.com/c-6.htm All the way at the bottom of page.

It's called the "Fuel Rail Spacer / Insulator"
"This is simply the plastic spacer that goes under the primary fuel rail for 86-92 where it bolts to the center housing. The rail will not seal correctly to the top of the injectors without the spacer. This is another part that likes to "disappear" during engine work."

here is a reference picture

You don't need that on the KGPARTS fuel rail. The rail height is adjustable, meaning you can raise (or lower) the rail.

I ended up leaving the OEM diffuser, (removed the OEM spacer) + the OEM injector grommet. Seems to be working, but...

I don't know, it doesn't feel right
Old 06-25-08 | 05:10 AM
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Old 06-25-08 | 06:46 AM
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From: VA
Originally Posted by rxrotary2_7
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Keith, U are the MAN!!

FYI for everybody - The spacers are made with a very tight tolerance... tossing them in the freezer to shrink them will help in sliding them in without having to press fit or struggle.

BTW - This post was by no means a slant against KGPARTS, they shipped everything right away, and their price is reasonable. Keith also responds ASAP.

I just wanted to see what others have done
Old 09-15-08 | 07:10 PM
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So did you end up leaving the OEM injector spacer out or did it go back in underneath the KGParts spacer?

Basically I'm asking does it go:
Injector-->KGParts spacer-->OEM Spacer-->diffuser

-or-

Injector-->KGParts spacer-->diffuser


Originally Posted by KNONFS
850CC Bosch style injectors.



I did, but I was hoping not to; when I purchased the KGPARTS injector spacer.
http://kgparts.com/index.php?page=diy


I was able to find the hardware fairly quick, however the bottom section of a bosch style injector is different than the OEM style; so the OEM diffuser + OEM air bleed + OEM spacer + OEM injector grommets don't work.

I thought that with the KGPARTS spacer, all I had to do was leave in place the OEM diffuser (and remove everything else) + the KGPARTS spacer; and then install the bosch style injector and fuel rail. Unfortunately, the KGPARTS spacer did not "drop in" into the injector holes. I think the injector spacer, needs to be pressed (or hammer in) into the center plate injector hole



You don't need that on the KGPARTS fuel rail. The rail height is adjustable, meaning you can raise (or lower) the rail.

I ended up leaving the OEM diffuser, (removed the OEM spacer) + the OEM injector grommet. Seems to be working, but...

I don't know, it doesn't feel right
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