Thoughts on these readings – Anything to investigate?

[John]

1,000 hr – QSC 540’s
ZF 285 A

Listed out the data I pulled from the SmartCrafts at cruise and WOT. I note port engine a bit shy of WOT. Just had props done so will get it tweaked to get more RPM.

Any thoughts on the difference or what they are showing?
Manifold Temps, Gear Temps, Loads, etc.?

Thanks in advance,

J

Topic

[Clark Leighs]

Just some suggestions:

Higher fuel filter restriction from more contamination one side to the other so one filter collects more  junk.

Hoses degrading inside closing the pathway.

Longer hose runs one side to the other.

Partial kink in one hose.  Doesn’t have to be a full kink.

More fittings such as elbows one side to the other.

Tank vent on one tank has a bit more restriction from hose degradation, bugs clogging the vent, kink in the hose.

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John

[John]

Thank you Tony. I appreciate the help.

Regarding higher fuel restriction, what could be the cause of that / should I bother to chase it down?

Happy to throw a part or two at it (or take some other readings/measurements) if you have any recommendations.

Filters are Racors 1000 w/20 or 30 (can’t remember at the moment but same on both motors) and the spin ons.

All the best,

J

[Tony Athens]

I went over it all a few times and overall things look about as good it it gets what you want to ask for it all at WOT.. Nothing wrong with that at all as that is what many people need to get the cruise speed at a reasonable RPM to run at when they travel..

Not that this really matters, but becase the GPH is quite different on the engines at cruise, I’d be curious if the reading was being affected because of higher fuel restriction on that engine.. Even though actually GPH might be the same. HIGH fuel restriction can skew that reading because the algorium used to measure looks at electronic throttle internal position and to overcome that restriction, the throlle moves higher to compensate. I do not have full understanding of that, but fo sure this happens..

[Author]

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