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Crusader fuel usage

G

gmw67

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I recently purchased a 2007 Luhrs 28 Hardtop with twin Crusader 5.7 MPI 330 hp. The Port engine is using more fuel (no flow scan) than the Starboard unit. Both engines have 158 hours on them. Anyone experience this and/or know possible causes/fixes?
 
If you have no fuel flow meter, how did you verify one engine is thirstier than the other?

How much higher is the fuel consumption?

How long has this been going on?
 
Timing, dirty flame arrestor, dirty injectors, running too cold, bad prop, bad plug(s) and or wires, distributor cap dirty inside, etc. etc. It's a long list!

Have fun.

Jeff
 
As I read through this...here is my question. What would you think is the difference in overall fuel burn before you begin to think that ONE is burning more than the other? Would you say 5%, 10% 20% ????

I have fuel flow metering and I have a slight difference in fuel consumption but I just accept it as a normal variable. I would not think they could be identical. Especially that I have no exact idea if they are each running symmetrical rpm as well. The sync looks good but if just a 3% +/- error is built into the sync gauge...that would help to throw off any real determination, does'nt it?

So, how much before you could say." HOLY COW, That one is using a lot more fuel!"
 
two big drivers here: mechanical assembly and "state of tune". The first is something you "buy" and can't control. This is design tolerance and I'd estimate that +/-5% would be a reasonable figure for "manufacturing tolerance". The state of tune is something you have more control over and usually is a bigger factor when something goes wrong. Jeff's example reinforces this. I've seen similar figures when plug wires fail, especially at cruising rpm.

I start troubleshooting when the flowscan shows any noticeable deflection beyond "normal" at cruise rpm....going from memory, this would be +10-15%
 
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