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Re: Is Kent Moore Tool J-7090 worth the investment
don't waste your $. I had one for years. tried using it in the mid 70's. useless IMHO. never used it again. sold it at carlisle for 100 bucks several years ago. they are man cave display items. . mike mccagh -
Re: Is Kent Moore Tool J-7090 worth the investment
Leo, I think that tool is a "historical" conversation piece. In my opinion an exhaust analyzer is the only way to fine tune an old fuel unit. I have used that on one of my 2 fuel cars and that convinced me. An exhaust analyzer can be expensive but there are new alternatives that hook into a laptop. Good luck, Don H.Comment
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Re: Is Kent Moore Tool J-7090 worth the investment
Leo,
Good results can be had with the old Kent-Moore manometer but excellent results can be had with more modern equipment.
If your 7320 has never been modified, say with nozzles with drilled out orifices, you can use the KM gadget to get good calibration. Any modifications at all, however, render the KM thingy unusable.
A far better tool is a wide band air/fuel gauge. This device will let you tweak the air/fuel mixtures at cruise and at wide-open-throttle to their optimum values, regardless of what's been done to your FI unit.
When I calibrate an FI unit, I use air/fuel equipment made by Innovate Motorsports. There are other suppliers of wide band a/f equipment but I like Innovate equipment for its modular nature. Capability can be added incrementally as needed. For example, when I set out to solve the FI fuel perc problem, I added a thermocouple interface to my Innovate hardware and was able to note the exact conditions under which fuel perc happened.
In any event, I would NOT recommend spending money on a KM manometer unless you desire one as a piece of FI history. If, instead, your goal is to accurately calibrate your FI unit, buy a wide-band air/fuel gauge.
JimComment
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Re: Is Kent Moore Tool J-7090 worth the investment
Thank you all very much for your insights and opinions. I will invest in an analyzer rather than the historical man cave device. You all have confirmed what I thought.
LeoComment
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Re: Is Kent Moore Tool J-7090 worth the investment
Leo,
There is a definite sequence of steps to follow if you want your FI unit to be correctly calibrated. When you have your wide band air/fuel gauge, get in touch with me and I'll walk you through the proper procedure.
JimComment
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Re: Is Kent Moore Tool J-7090 worth the investment
Thanks Jim I have already started trying to educate myself on the innovate Motorsport equipment. Are you speaking of their LM-2 basic kit as a starting point?
LeoComment
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Re: Is Kent Moore Tool J-7090 worth the investment
I don't have first-hand experience with the LM2 but I believe it will work well. I use the less expensive LC1 controller (out of production) and the LC2 controller because I'm cheap and they cost less.
A key requirement, IMHO, is the ability to record a test session for later, off-line review. Invariably there will be events or anomalies which you couldn't have noticed by occasional glances at a gauge. Reviewing a data log allows you to catch them.
I believe the LM2 records to an SD card or maybe a micro-SD card, not sure. The simple controllers I use connect to a small laptop computer I carry in the car with me. One way of recording isn't better or worse than another. The key thing is to have the ability to record and review a session.
If you buy an LM2, I believe you will have the ability to also monitor/record engine RPM. I recommend you take advantage of that capability. Knowing RPM will help you identify where you were and what was happening concurrently with a given air/fuel ratio reading when you review your data log.Comment
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Re: Is Kent Moore Tool J-7090 worth the investment
I've attached a screen shot of the kind of data I can record when I'm calibrating an FI unit. The dark, almost black trace is air/fuel ratio. The purple trace is engine RPM. (The other traces are either not presently connected or not calibrated.)
At 21:15 in the log, I went wide open throttle in 4th gear and, as a result, air/fuel suddenly goes rich, as indicated by the sudden drop. Notice, too, that for the duration of the wide open throttle sprint, RPM climbs.
At the left edge of the screen shot, you can see RPM rise and fall as I work through the gears. You also notice that air/fuel ratio momentarily goes very lean at the moment of a gear change. Watching only a gauge, you'd probably not notice that.
In any event, this is the kind of information I have at my disposal after a test run because of my data log.
logworks-20220125.jpgComment
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Re: Is Kent Moore Tool J-7090 worth the investment
Leo,
FYI: My FI '60 is my "found in a barn" car and I've had it since April of '79. I bought my first FI unit in '77 from a well known South Carolina hoarder. I've been hooked on Rochester fuel injection ever since.
Your remark about your car being driven "a quarter mile at a time" makes me chuckle.
Regarding Duntov and Dolza, I strongly encourage you to read and absorb the 1957 SAE paper co-authored by Duntov, Dolza, and Kehoe. Even though the developers of FI didn't fully understand what they had wrought at the time, ALL of the fundamental principles are described in detail and will contribute to your understanding.
Once understood, there is nothing an FI unit can do which will surprise or baffle you.
The nylon bolts are available from Amazon. You want 1/4-20 x 1.5" bolts.
BUT, pay attention here(!), I don't claim they will cure fuel perc!!!!! I claim only that they help measurably. The Big Change is the alteration to the fuel path to let a C1 FI fuel path mimic that of a C2 FI fuel path.
JimComment
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Re: Is Kent Moore Tool J-7090 worth the investment
Leo, PM me your email address and I'll send you an electronic copy of the SAE paper. JimComment
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