drag motor question

[stoker2001]

if you remove filter screens in fuel injectors,should you lean ecu down to compensate

[W. Tripp]

The cheap way is to base fuel trim on EGT readings, spark plugs and piston crown burn pattern.

The better way is to have the injectors bench flow tested. This way you can blueprint the injector to the cylinders. (highest flow to #'s 6 & 5 - lowest flow to #'s 1 & 2).

I hope this helps.

You might think about, they put them in for a reason. Do you remember what happened when you removed your water separator?

I would leave them in even with small amounts of debris they can still flow It just takes a small amount to clog the injector. If it sticks open you can be rich, I know you know what happens if it gets closed up..............Uncle Tony;)

[stoker2001]

i should have known you would be on your puter,you should be out lake testing,i know you want some redemption at next spanping party,hehehe

Hey Hey Hey other than 100 thousands ring gap and water in my motor, my boat was running fine. Can you say leak down..........Uncle Tony:D

[Russ]

Stoker, you can run w/o screens installed, your choice, and you really don't need to change any of your tuning practices. In addition to what Wayne's saying in using the "better way", I wouldn't ignore the practices stated in the "cheap way" if your going with the "better way". Whew... is that clear as mud? Also, keep in mind that these injectors were designed for automotive use, and they are being used in the marine outboard application out of convenience. Yes, the screens do catch material and will deliver within a flow spec for a certain amount of clogging. If you forget about cleaning, the debris won't forget to keep collecting, and you know where it could go from there. The other important aspect with these automotive injectors with these screens is that they were made to pass gasoline, not a fuel/oil mix specifically. So should keep that in mind, as, if the injectors remained idle for a long period of time that oil in the fuel could settle out of the fuel, coagulate and find a nice area to cling to (the screen) think you could picture the rest. Granted, this may not happen allot, but it has happened. Personally, I run without. The Kinsler filter I run upstream of the rail filters out anything big enough to be a problem, anything that isn't filtered is small enough to pass right on through the injector. Just another idea...

[Jay Smith]

Everytime we build a motor we remove the screens. To remove use a long dry wall screw and start in by hand about two threads or rounds then use pliers and wiggle the screw like you are pulling a tooth and it will come out ! Then we run the WIX 33093 filter and change often ( once a month and @ $ 6.00 a pop its cheap insurance ) it will richen the mixture a little probally my guess about 3 to 5 %.

Good luck,
Jay @ JSRE

[dan agnew]

jay as per uour instructions on a thread here i got a handful of the wix filters my question is will it take the fuel pump pressure of an efi? the napa person could not tell me what pressure was max.
after talking to chuck goodman i think i want to plumb in two efi pumps and activate the second one when wfo so as to minimise pressure loss on top. put a filter tween tank and each pump? or just one in line after joining fuel lines?
thanks for the advise.

Danny

[Jay Smith]

Danny ,
The wix filters are off an earlier model Caddy with a high pressure EFI system I have been using them for years with no failures or problems !

Jay @ JSRE

[dan agnew]

thank you for the prompt reply

Danny

[Rickracer]

I know the electric pumps don't like eating trash, but it takes a lot less restriction to starve the pump on the suction side than on the pressure side. I found this out the hard way.....:D :D