drilling injectors

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Jul 18, 2004 | 10:25 PM

train460

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Joined: Dec 2003

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From: Outside Houston

drilling injectors

Hello friends
looked under the search but could not find anything about driling out the injectors for more power. Any thoughts?
thanks
Michael Hansen

Jul 19, 2004 | 06:17 AM

tjbeggs

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Joined: Apr 2004

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From: Silver Lake Dunes, MI

i think you are talking about drilling out the nozzle thinking a bigger hole means more fuel. it may work it may not. i don't know alot about injectors other than they are a precsion unit and they are expensive. to me the idea sounds like a $1600 mistake. in some engine if and injector is spraying on the wrong part of the piston it could burn the piston. i would stay away from do it yourself upgrades on you injector. just my quarters worth of thoughts.

tjbeggs

Jul 19, 2004 | 09:12 PM

cookie88

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Joined: May 2001

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From: Cabot, Arkansas

Switching to tips with more holes that are smaller will make better power than a few large holes....better atomization and a more thorough burn. People have modified their stock tips by extrude honing them, but it is my understanding that the nozzles will tend to crack (18000-21000 psi will do that to thinner walls).

I wouldn't even think of "drilling" out my nozzles....heck, I've never even seen a drill bit that goes down to .006", and the biggest holes I've seen on a HEUI injector was .012"

Jul 19, 2004 | 09:31 PM

farmb0y

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From: IOWA

Yea, I wouldn't think you would want to drill out your injectors. Like cookie said, you want more atomization, which is accomplished by smaller holes and higher pressure. I don't know if you have heard anything about the 10K mod, but it increases the injector pressure to improve the mist into the cylinder, I did it and got a noticable difference out of it. I can't complain either for the whole $0.25 I spent on it.

Jul 20, 2004 | 12:22 PM

Lightning4me

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farmbOy

please elaborate on the 10k mod.

Jul 20, 2004 | 06:36 PM

farmb0y

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From: IOWA

I use to have a website that gave good instructions on how to do it, but can't find it. Maybe somebody on here knows it or even go to the search and look up 10k mod.
You use a 10k ohm resistor (normally used on circuit boards, can be picked up at radio shack for ~$0.25) to increase the injector pressure. You wire the resistor into two wires on the injector pressure control, which tricks it into thinking that the injector pressure is low and so kicks it up to get it back where it should be, but in reality it's increasing the pressure even more. It's simple to install, and there are different ways to have it set up. I have mine on a switch, so I can turn it on and off whenever I want. Others wire it in to their 'go' pedal so when they let off it will open the circuit and the resistor isn't being used, but when they step back on it, it kicks in. That's nice because the 10k mod will roughen up your idle, kinda like you put a bigger cam in it. I'll see if I can find that website and get back to you.