(Fwd) RX7 injector flow rates.

[Craig Pugsley]

Hi there,
Over on RX7 club there's been discussions of injector flow rates. Here's
a test someone (Rob Gallant) performed. Forwarded for your viewing
pleasure :-)

> Here's the details on the injector measurements:
> 
> Pressure: 37 psi
> Test Fluid:  Paint thinner
> Fluid Density:  .77 gm/cc
> Temp:  65 F
> Humidity:  50 %
> Peak Current: 4.3 
> Coil Resistance:  2.2 ohms
> Static pull in current:  320 ma
> Coil Inductance:  7.2 mh
> Static dropout current 160 ma ('86), 85 ma (GSL-SE)
> Static flow rate:  71.87 ('86),  107.6 lb/hr (GSL-SE)
> Opening Delay:  1.8 ms
> Closing Delay:  1.8 ms
> Opening time with no flow:  1.5 ms
> Closing time with no flow:  1.5 ms
> 
> '85 GSL-SE Injectors:
> 
> On    Peak  Cycle  Total   Total On  Mass Flow
> Time  Time  Time   Cycles   Time      Rate
> 
> 1 ms  1 ms  10 ms  16000    16.5 ms    29.4 lb/hr
> 1.5   1     10     8000     12.2       59.0
> 2     2     20     8000     16.2       76.3      
> 4     2     20     4000     16.3       92.5
> 6     2     20     4000     24.1       94.0
> 8     2     20     2000     16.1       95.6
> 10    2     20     2000     20.1       96.6
> 12    2     20     2000     24.1       99.0
> 14    2     20     2000     28.1       100.2
> 16    2     20     2000     32.1       102.2
> 18    2     20     2000     36.1       104.5
> 
> '86 Non Turbo Injectors:
> 
> On    Peak  Cycle  Total   Total On  Mass Flow
> Time  Time  Time   Cycles   Time      Rate
> 
> 1 ms  1 ms  10ms   16000    16.5       22.5
> 1.5   1     10     8000     12.2       34.6
> 2     2     20     8000     16.3       52.5      
> 4     2     20     4000     16.3       60.0
> 6     2     20     4000     24.1       62.0
> 8     2     20     2000     16.1       63.5
> 10    2     20     2000     20.1       64.7
> 12    2     20     2000     24.1       65.1
> 14    2     20     2000     28.1       66.5
> 16    2     20     2000     32.1       68.5
> 18    2     20     2000     36.1       70.6
> 
> I also put a scope on my car while driving and found the pulse width of the 
> injectors varies with throttle position.  Max pulse time is approx 10 ms.  This 
> is full throttle below 3750 rpm, so only the primaries are firing.  Above 3750  
> the primaries and secondaries fire at the same time, with a max pulse width of 5
> ms.
> 
> So at 5 ms, two '86 injectors flow about 122 lb/hr of fuel. With the secondary 
> replaced with a GSL-SE injector, this will be: 61 + 93 = 154 lb/hr.  This 
> represents an increase of approximately 26.3 %.
> 
> Later
> 
> Rob
> gallant at oasys.dt.navy.mil
> 
> 
Craig,
pugsley at trl.oz.au