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What are your injector cleaning / flow test results?

towerymt

the real Towery
Joined
Sep 18, 2002
Location
VA, USA
I just got a set of 4 injectors back from WitchHunter Performance (www.witchhunter.com) and I was concerned about the actual measured flow rate, even though it's even across the set.

They are Bosch p/n 0-280-150-785 for the orange 850 Turbo injectors. They flowed 207cc/min at 43.5psi.

Anyone else have measured data on the orange 850 Turbo injectors?

I wonder how it could be so much lower than published data. We ran the same injector on our lemons car with ~14psi boost, probably making close to 200whp....if they actually flowed that little, I think we run out of injector...but AFRs were safely into the 12s at WOT down the straights.

Other sources list their flow rate at 43.5psi at over 300cc/min, but that doesn't seem accurate. I noticed here that 310cc/min is given at 57psi instead of 43.5psi. At 43.5psi they're listed at 270.9cc/min...still considerably higher than 207-208cc/min.

http://users.erols.com/srweiss/tableifc.htm

My injectors yielded 208, 208, 207, 207 cc/min @43.5psi

Other measurements from the service:

Resistance: 14.5, 14.4, 14.5, 14.4
Static flow:
dirty: 102, 103, 0, 100
clean: 104, 104, 103.5, 103.5

Pulsed flow cc@2500rpm:
dirty: 115.5, 117, 0, 114
clean: 117, 118, 117, 117.5

static variance: 0.5% after cleaning
pulsed variance: 0.8% after cleaning
 
I have never used WitchHunter. Do they provide the performance results to you in cc/min or did they provide it in lb/hr or gm/sec and you did the conversion? Fuel injector cleaning services do not flow test with gasoline for safety reasons. They use a less flammable similar viscosity test fluid. The test fluid has a different density than gasoline. If they provided a mass flow rate based upon the test fluid and you converted that to cc/min using the density of gasoline, that will create an error. However, 208 versus 270 does seem a bit large because the density difference is normally much less than 30%.

If WitchHunter provided the results as a volume flow rate, then it is unlikely that the test fluid density is the source of your discrepancy.
 
Not for this particular injector. You want cookies?

Sure. Any injector with published flow rates.

I have never used WitchHunter. Do they provide the performance results to you in cc/min or did they provide it in lb/hr or gm/sec and you did the conversion? Fuel injector cleaning services do not flow test with gasoline for safety reasons. They use a less flammable similar viscosity test fluid. The test fluid has a different density than gasoline. If they provided a mass flow rate based upon the test fluid and you converted that to cc/min using the density of gasoline, that will create an error. However, 208 versus 270 does seem a bit large because the density difference is normally much less than 30%.

If WitchHunter provided the results as a volume flow rate, then it is unlikely that the test fluid density is the source of your discrepancy.

They gave results in cc/min at 43.5psi. Fluid temp was 71F.

Thanks for the info.
 
I clean them myself with Berrymanns compressed air and a 9 volt battery.

Many used injectors just have debris caught in the inlet screen, EZ fix.
 
Finally found my book on our build. We used Advanced Injector in Valley Center, Kansas. We had 8 injectors out of an '88 Camaro L98 done. Bosch # 0-280-150-223. Flow values at 3 bar.

Resistance: 16.0 16.0 16.0 16.0 16.0 16.0 16.0 16.0
Static Flow cc
Dirty: 242 250 250 253 253 250 253 254
Clean: 255 254 255 255 255 254 255 255

Pulsed flow cc @ 2500
Dirty: 121 125 125 126 127 125 127 129
Clean: 130 130 130 130 130 129 130 130

How is it your static flow was less than pulsed?
 
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