JPI and fuel flow

[Pictreed]

How difficult is it to add a fuel flow? 65 E

I have a JPI 7xx.  I need to send it in because while it was in the shop the left bank of digits went out.  The shop is going to make sure something didn't get unplugged but I figured if there's something they have to do to the unit is do it while it's there although me feeling is that it's already there and I just need the sensor. 

I'm going to add gami injectors and was thinking they may need fuel flow. 

I want to upgrade to the 9xx at some point so I don't want to get too deep into this one. 

Tim

[Bob_Belville]

Tim, are you sure you need GAMIs? Most IO360s are naturally pretty well balanced and do not benefit. If you have 4 cyl EGTs and FF you can run a LOP check to verify your engine will run smoothly LOP.  Even w/o FF if you have EGT on all cyls you can lean out to ~30deg LOP and see if the engine is happy there. 

My E cruises @ 8.3 gph. I recently flew 603 nm with about a 15k headwind to MRN-MSN on the way to KOSH. 4:43 fighttime, used 42 gallons. 

https://flightaware.com/live/flight/N943RW/history/20160722/1210Z/KMRN/KMSN

[mike_elliott]

34 minutes ago, Pictreed said:

How difficult is it to add a fuel flow? 65 E

I have a JPI 7xx.  I need to send it in because while it was in the shop the left bank of digits went out.  The shop is going to make sure something didn't get unplugged but I figured if there's something they have to do to the unit is do it while it's there although me feeling is that it's already there and I just need the sensor. 

I'm going to add gami injectors and was thinking they may need fuel flow. 

I want to upgrade to the 9xx at some point so I don't want to get too deep into this one. 

Tim

It is not hard to add to the JPI. Just get the add on from them. You will also need a couple of new fuel lines where you install the transducer.

The chances of needing GAMI's are slim. Make sure your induction system is "tight", no leaks at the intake ports, etc. After you get the FF option, determine the FF at Peak EGT for ea. cyl. swap out the high FF cyl injector with the low FF injector, repeat the lean test. If your intake system is good, your spark plugs good, you should be able to run well LOP on stock injectors with an IO360.

[carusoam]

One can't tell the 'need' for GAMI injectors without FF.

The GAMI test is essentially leaning and recording the difference in FF from the first to the last cylinder to peak.

This is the GAMI spread.  If the spread is large, there are a few things that can be done like swapping the injectors around.  This works because the airflow is not perfectly distributed either.

Asside from that, FF with a totalizer is a great to have type of device.

 

you may get a feel for how wide the spread is by noting the number of turns of the red knob are needed between the first and last peak...

If they all peak within a half turn, that would be pretty tight.  Compare to a similar plane that has a FF device.  How many GPH is added for each full turn of the mixture knob...?

PP ideas, not a mechanic.  Some things to consider while figuring out your next additions...

the nice thing about adding a FF sensor to your JPI, it can be shared to your GPS.  The GPS does the calculations like fuel needed to get to your destination based on current conditions.

A smooth running engine isn't worth very much if it runs out of fuel... 

Best regards,

-a-

[DXB]

You will love having a well calibrated fuel flow readout - was worth every penny even in my carb'd plane.   It's made leaning quicker, easier, and more consistent.  It adds huge peace of mind to fuel management in flight. I would freak out if it stopped working (irrationally, of course).

[HRM]

I suggest a EI MVP-50. Why not add everything but the kitchen sink while you add FF?

If mine served espresso in flight I wouldn't be surprised.

[Pictreed]

Well, I ASSumed I needed the Gamis. 

I made a couple 1-2 hour trips last week and I'm starting to learn my plane a bit more each time.  It's hard to tell anything with the left bank of digits missing on the JPI so I need to get that fixed first. 

It looked like when I get to about 350 degrees on the 1 and 4 cylinder, 2 and 4 are anywhere between 30-50 degrees cooler.  But the engine runs rough.  

When I get the engine smoothed out by enrichening the mixture number 1 and 4 get about 380 degrees. 

I need to get the JPI fixed and get someone to go up with me that knows what they're looking at. It's very possible there is nothing wrong...except with the operator!

Tim

[Pictreed]

So about how much are we looking at for adding fuel flow?

[kortopates]

While they have your unit be sure to talk to them about upgrading it to support FF and make sure it has downloadable memory on it too or it'll still be useless. You really can't record much useful info in the air. You need to fly it and then download the data on the ground and look it on your computer. As you talk to JPI, consider upgrading the display to the newer color 830 display. You can look on Spruce to check prices for any sensors including FF and the upgraded display which is a trade in and you will see all parts are cheaper through Spruce than JPI.

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[kortopates]

By the way, the lost display columns are almost always from an installer tightening the screws too tight and cracking it. They rarely fail otherwise.

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[Guest]

6 hours ago, Pictreed said:

So about how much are we looking at for adding fuel flow?

I believe that it's 695.00 to add fuel.

Clarence