Fuel injector cleaning services

Black_Diamond

I'm looking to pull all my injectors and get them cleaned/serviced, if nothing more than preventitive maintenance and maybe help with my performance issues (real or perceived lol).  Anyone used a cleaning place they can recommend? 

Seem to be a lot just searching..Witchhunter performance (WA)..lots of small places..

Thanks!

212rowboat

if it's truly 43, it will make your job easier... The emerging industry standard is 43.5psi, but different makers use different pressures.. Ford motor sports uses 39psi, mopar 49psi, as examples.. an injector that delivers, say, 250cc of fuel to a cylinder on like displacement engines and is dead on with that delivery will be hugely different depending on the pressure.. a Ford may use a 35# injector with its 39psi rail pressure, but mopar may only use a 24# injector for the same displaced engine... After you dtermine delivery at various pressures you gotta nail down an injector that provides the proper spray characteristics at that pressure, so it doesn't drip or turn into a pencil sprayer... 

For what it's worth, injectors rarely go bad unless exposed to dirty fuel.  Rarely. 

I'll tell you what does go bad, though, and is a pita to isolate: fuel pumps... They operate way outside of parameters at odd times during their work, but may be fine at idle.. it makes it hard to figure.. hint... hint...  

YYZRC

@Black_Diamond did you ever pull the trigger on injectors?

212rowboat

you can likely purchase new ones from bruce at fiveomotorsports which have been benched and grouped for not a lot more than having them cleaned, rebasketed, and benched by a competent shop.... a lot of those shops simply drop them in an ultrasound cleaner and call it a day...

go with a replacement by Siemens or one of the FMS models that match up in flow+duty cycle (which are made by Siemens)    for replacement... for the love of all that's holy, stay away from accel. 

edited to add: five hole sprayers are the way to go, too... they mist A LOT better, as opposed to relying on the backside of a hot valve to atomize the spray.... I once swapped out single hole sprayers for five hole sprayers, and found that I could retard my fuel sync by 4~7* and maintain good exhaust A:F sniffed by a five wire... the retard (spraying closer to TDC) allowed less fuel to be delivered for the same performance, hence increase in economy (worth nearing 1.5mpg on the ground if I recall correctly)... 

good stuff... no?

Black_Diamond

Thanks Drew...my concern was like yours..some just do a simple ultrasonic clean and done, a few places are almost word for word the same for what they do..odd.  I emailed five-o to see if they do the injectors for a Mercury, their prices seem cheap for new so hope they are not chinese fakes..some bad word on those, I've seen the Mercury ones for near $150 each..ouch. 

212rowboat

you don't have to use the merc ones... many if not most of the quality ones are branded by siemens.. they will cross reference, and bruce is the man to know...

i've purchased at least four sets from him over the years... he doesn't do weirdo stuff like other places which pray on peoples lack of knowledge on those things..

you'll have to determine your connectors, and your stack height, and of course the diameter of the mating side... the fuel pressure needs to be known, and an injector selected that maintains the wanted spray characteristics and volume at the pressure the pump provides... if you match up those things, you can choose from a huge selection of injectors available on fiveo. 

Black_Diamond

Sounds like a project in the making!  Carbs were so much easier lol  I would assume 43psi is the operating pressure.  I'll have to dig into all the stack height, connectors and diameters info..

 

Thanks for the tips!

raybo3

RY I think BD is falling 3 or 4 MPH shy of where he should be......

Black_Diamond

Never did go this route. The Hill 4x4 props and pitch drop did the trick.