Shuiend tries built motor #4, lets see how I break this one - Page 16 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-29-2010, 03:54 PM   #301
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Seat those hoes.
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Old 10-29-2010, 04:07 PM   #302
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Seat those hoes.
I will tomorrow. Hopefully that works out, as I miss boost so much.
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Old 10-29-2010, 04:26 PM   #303
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What brand is your fuel rail? I am installing a FM dual feed and new injectors this weekend.

I just lube up the injector o rings with some oil. Those stupid injector holes in the head also get so dirty. I think it is just luck whether or not your **** leaks fuel or vacuum when you tighten down the rail.
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Old 10-29-2010, 04:29 PM   #304
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What brand is your fuel rail? I am installing a FM dual feed and new injectors this weekend.

I just lube up the injector o rings with some oil. Those stupid injector holes in the head also get so dirty. I think it is just luck whether or not your **** leaks fuel or vacuum when you tighten down the rail.
It is an old BRP dual feed fuel rail that I just picked up. This is actually the first time I have ever had a fuel leak, which is surprising.
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Old 10-29-2010, 04:45 PM   #305
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Sometimes its the spacers that don't get seated completely that can cause this as well. That was my problem once, and spewed a wonderful mist that could have easily burned it to the ground.
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Old 10-29-2010, 07:15 PM   #306
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I had a soap opera with the DW injectors' O-rings too. They are way more finicky than RC injectors for some reason.

If you tightened the rail down and got a fuel leak, those O-rings which leaked are goners. Search for my post re: proper replacements.

The trick is to semi-position the injectors in the head, position the rail, then one by one carefully pull the injectors up with a twisting motion, to properly seat their O-rings, starting at one end, working your way in a line to the last injector. The difference in the feeling of when the injector O ring is properly seated, vs. slightly cocked and leaky, or the feeling of the O-ring popping in place, is quite subtle.

Then you make damn sure they are all properly seated before you cinch down the 3 bolts that hold the rail down. And as you tighten them evenly, you twist the injectors slightly to verify the feeling that they are seated.

You will want several extra O rings.

BTW another good tip is to JB weld or silicone the 3 black spacers that sit between the rail and the mounting bosses on the head, to the head, because they like to fall out and disappear at the worst times.

Your fuel leak is between the injectors and the rail. The bottom, where the injectors go into the head, will leak vacuum/boost, not fuel.
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Old 10-30-2010, 12:28 AM   #307
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Quote:
Originally Posted by JasonC SBB View Post
BTW another good tip is to JB weld or silicone the 3 black spacers that sit between the rail and the mounting bosses on the head, to the head, because they like to fall out and disappear at the worst times.
Holy **** that is a great idea.
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Old 10-30-2010, 12:08 PM   #308
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Quote:
Originally Posted by JasonC SBB View Post
I had a soap opera with the DW injectors' O-rings too. They are way more finicky than RC injectors for some reason.

If you tightened the rail down and got a fuel leak, those O-rings which leaked are goners. Search for my post re: proper replacements.

The trick is to semi-position the injectors in the head, position the rail, then one by one carefully pull the injectors up with a twisting motion, to properly seat their O-rings, starting at one end, working your way in a line to the last injector. The difference in the feeling of when the injector O ring is properly seated, vs. slightly cocked and leaky, or the feeling of the O-ring popping in place, is quite subtle.

Then you make damn sure they are all properly seated before you cinch down the 3 bolts that hold the rail down. And as you tighten them evenly, you twist the injectors slightly to verify the feeling that they are seated.

You will want several extra O rings.

BTW another good tip is to JB weld or silicone the 3 black spacers that sit between the rail and the mounting bosses on the head, to the head, because they like to fall out and disappear at the worst times.

Your fuel leak is between the injectors and the rail. The bottom, where the injectors go into the head, will leak vacuum/boost, not fuel.
Thanks for the advice, I am betting that is the exact problem I am having. I remember some of the injectors did not feel like they seated properly when I first installed them. I also went from RC to the DW just like you.

I am off to advance to pick up some O-rings now and then will reinstall those 2.
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Old 10-30-2010, 01:10 PM   #309
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I just noticed something on one of my injectors.


One of my injectors is missing the little yellow part on top. I have looked all around for it and I cannot find it. Should I try just putting 2 o-rings on there? I will be contacting DW Monday to see if I can get a replacement.
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Old 10-30-2010, 02:36 PM   #310
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So I swapped back to my 94 fuel rail to see if that helped. I am still getting leaks on 2 of the injectors. It seems that when I have the fuel rail tightened down the angle of the injectors is off and that is causing the leaks. I am attaching 2 pictures to help illustrate what is going on the best that I can show it.

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Old 10-30-2010, 03:03 PM   #311
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I found some old tan tops that I had and compared the DW to them and the DW injectors are definitely shorter. When I threw in the tan tops the car started up right away and no fuel leaks. I am going to try the DW without the spacers and see how they work then. If not, I might drive around on my tan tops for the engine break-in period and then until I talk to DW about the shortness.
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Old 10-30-2010, 06:26 PM   #312
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So after fuxoring with my **** today this is what I have gotten done. The DW1000cc injectors are about a quarter inch shorter then my stock tan tops. When using the tan tops I get no fuel leaks, but they do not have pintel caps so I get bad vacuum leaks there. I let the car semi-idle and get up to coolant temps of 180 degrees. I then drained the oil and it looked perfect. No water or gas and nothing was coming down the side of my blocks.

I will be off to all the local parts stores tomorrow to see if any of them have pintel caps. I do not have my hopes up, but you never know. Then first thing Monday morning I will be calling DW to try to get my injectors sorted out. Once I get my fuel situation sorted out I should be able to get the thing on the road.
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Old 10-31-2010, 05:04 PM   #313
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shuiend:

You're using an NA fuel rail on an NB Head.

This is the source of your problem.

They aren't made to play well together.

The NB mounting is angled differently.

Get a proper fuel rail.
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Old 10-31-2010, 06:45 PM   #314
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Quote:
Originally Posted by fooger03 View Post
shuiend:

You're using an NA fuel rail on an NB Head.

This is the source of your problem.

They aren't made to play well together.

The NB mounting is angled differently.

Get a proper fuel rail.
If this is the case, I have a fast forward superchargers dual feed fuel rail I'm not using. And will shortly have a stock NB rail I won't be using.
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Old 10-31-2010, 07:46 PM   #315
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Quote:
Originally Posted by fooger03 View Post
shuiend:

You're using an NA fuel rail on an NB Head.

This is the source of your problem.

They aren't made to play well together.

The NB mounting is angled differently.

Get a proper fuel rail.
That actually makes a lot of sense, because when I would tighten down my fuel rail the angle would be off. I actually used an nb rail the first time I put my engine together, but it fell and got bent to badly to be used. I guess I will be giving panic motorsports a call tomorrow and ordering a new one.
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Old 11-01-2010, 03:10 PM   #316
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NB rail has been ordered from panic motorsports and it will be in tomorrow. God I just want my car done.
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Old 11-01-2010, 03:14 PM   #317
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Originally Posted by shuiend View Post
I just noticed something on one of my injectors.


One of my injectors is missing the little yellow part on top. I have looked all around for it and I cannot find it. Should I try just putting 2 o-rings on there? I will be contacting DW Monday to see if I can get a replacement.

are those things just caps to protect the injectors? i wouldn't think you'd want to use them...not quote me on that... and how did you lose one?!
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Old 11-01-2010, 03:16 PM   #318
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are those things just caps to protect the injectors? i wouldn't think you'd want to use them...not quote me on that... and how did you lose one?!
I think they are there to keep the O-rings in place. I am not sure how I actually lost it or where it went.
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Old 11-01-2010, 03:18 PM   #319
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its in your fuel tank now...lol
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Old 11-01-2010, 03:26 PM   #320
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its in your fuel tank now...lol
I doubt it. Probably fell off when I was test fitting the injectors in the different fuel rails I had and such.
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