Running without Injector Mixing Plates?

Justen · 07-09-2009, 07:31 PM

Just wondering if anyone has completely/permantently removed their secondary injector mixing plates...?

Mine snapped off of the air bleed during my rebuild , but i noticed that the perforations in the plate were pretty dirty and completly clogged, so i don't see what good it could have been doing anyway.

and frankly, i don't really wanna spend 35 bucks for another one.

Has anyone had any success or problems running their motor without them?
Idle problems? Problems at high revs?

RETed · 07-09-2009, 09:46 PM

At the RPM's they normally kick in, you really don't need them.
As for the perforations being clogged, it doesn't really matter - the fuel does not need to shoot through them to be effective.

The big problem is that the fuel injector (tip) actually sits in them.
Without them, they will not center in their holes.
The lower grommet actually seals the tips, so this might or might not be a problem.

-Ted

***TitaniumTT*** · 07-09-2009, 10:12 PM

The injector will probably work it's way down into the LIM until it falls out of the fuel rail. That causes a problem. I don't know if this can happen with a stock rail, I'd imagine it can, it happened with my Marren rails/injectors when a grommet wasn't installed.

NoDOHC · 07-09-2009, 11:34 PM

If you broke the two supports for the perforated plate off the upper part with the o-rings you should be ok for injector support. I noticed a difference in starting without the primary deflectors, it might have hurt on-throttle response too (there were several factors involved).

RETed · 07-09-2009, 11:59 PM

Primary ones should always be replaced.
There just isn't enough intake velocity to allow for good mixing of the fuel with the incoming air.
This is why you see degraded idle and low RPM's response.

The OP was just talking about secondaries.

-Ted

Justen · 07-10-2009, 02:30 AM

yea it was one of my secondary plate supports (just the botom part that holds the plate). My primary ones are okay so i'll definately use those. and I guess i'll snap the other supports/plates off of the other secondary air bleed socket, and just use them as spacers to ensure the injectors fit right. ...As long as it doesnt harm performance

***TitaniumTT*** · 07-10-2009, 06:08 AM

Quote:

Originally Posted by RETed

Primary ones should always be replaced.
There just isn't enough intake velocity to allow for good mixing of the fuel with the incoming air.
This is why you see degraded idle and low RPM's response.

The OP was just talking about secondaries.

-Ted

I know Ted, I should've mentioned that it was my secondary injector that fell from the fuel rail. Started pissing fuel all over a pair of hot turbo's. I got lucky. VERY lucky.

07-09-2009, 07:31 PM	#1
Justen In Too Deep Join Date: Jun 2009 Location: Clifton, NJ iTrader: (3) Posts: 112 Rep Power: 16	Running without Injector Mixing Plates? Just wondering if anyone has completely/permantently removed their secondary injector mixing plates...? Mine snapped off of the air bleed during my rebuild , but i noticed that the perforations in the plate were pretty dirty and completly clogged, so i don't see what good it could have been doing anyway. and frankly, i don't really wanna spend 35 bucks for another one. Has anyone had any success or problems running their motor without them? Idle problems? Problems at high revs?

07-09-2009, 10:12 PM	#3
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	The injector will probably work it's way down into the LIM until it falls out of the fuel rail. That causes a problem. I don't know if this can happen with a stock rail, I'd imagine it can, it happened with my Marren rails/injectors when a grommet wasn't installed. __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

07-09-2009, 11:34 PM	#4
NoDOHC The quest for more torque Join Date: Sep 2008 Location: Sheboygan, Wisconsin iTrader: (1) Posts: 855 Rep Power: 17	If you broke the two supports for the perforated plate off the upper part with the o-rings you should be ok for injector support. I noticed a difference in starting without the primary deflectors, it might have hurt on-throttle response too (there were several factors involved). __________________ 1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers) 1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)

07-10-2009, 02:30 AM	#6
Justen In Too Deep Join Date: Jun 2009 Location: Clifton, NJ iTrader: (3) Posts: 112 Rep Power: 16	yea it was one of my secondary plate supports (just the botom part that holds the plate). My primary ones are okay so i'll definately use those. and I guess i'll snap the other supports/plates off of the other secondary air bleed socket, and just use them as spacers to ensure the injectors fit right. ...As long as it doesnt harm performance