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Do my engines have enough power
scottb3200
Member Posts: 46 ✭✭
I have a 320 with 5.0 mpi merCruiser
My mechanics telling me those engines are too small for that boat
Any intake on that ????
My mechanics telling me those engines are too small for that boat
Any intake on that ????
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Dream 'Inn III -- 2008 400 Express
Andy
Dream 'Inn III -- 2008 400 Express
drop a size in pitch for your props you wrote about
my 320 underpowered Can you explain to me
I don't get it
please help
Thant you
I have a friend with a 320 with 305s. He says its fine but a bit slow to plane when loaded. He just moves some people forward and takes it easy. He's happy with the boat. No question the 305s are less expensive to purchase and get slightly better fuel economy at lighter loads. I bought a new 2013 Rinker EC 310. I think it weighs the same as the Rinker 320. I had a choice of engines right up to the 377 Mags. I bought the 350 Mags. I did not think the extra $ for the 377s was worth it - but - I was really glad I got the 350 Mags because with gear and six people on board those 350s had to work to get the boat on plane. I know I would not have been happy with 305s. This is just my opinion as to what I would buy if I had a choice.
So to answer your question is it under powered, no. But it is powered by the minimum engine size for your hull, so the expectation should be the same.
mazda3 for her....
here comes one of my infamous winded responses...
the EFI/MPI is a LOT more efficient than carbs. It maintains fuel trim with precision, and the E part (electronic, denoting computer involvement) adjusts for engine temperature, ambient temperature, intake temperature, manifold absolute pressure or mass (as in weight) of air flow in the intake- coupled with adjusting spark timing based on a similar data set, and even sync of injection (timed similar to spark and based on pistons relation to time of injection/valve events)... it allows control a carb'd engine simply can't compare to..... the biggest gains is economy, wear, and power based off of using MORE available 'adjust on the fly' parameters...
Carb'd engines simply provide a squirt of 'enough' fuel volume into the intake manifold, and let the flow dynamics of the manifold feed hungry vacuum created by a diving piston... at times it can wash a cylinder, at times it can run lean, at times some cylinders are starved and others are rich, and it doesn't speak much with the spark function at all- meaning at one temperature you're running rich yet at another you're running lean and the spark doesn't know the difference....
think of it in terms like this:
both engines have capacity to generate torque @ a rate of 1:80 liter to #.
an 8 cylinder 5.0 liter displaced engine, running at 90% it's possible peak and due to having PCM/ECU controlled EFI/MPI engine can produce 360# of TQ, which due to stroke distance of travel translates in this hypothetical comparison of mine to around 300hp... advantage: this thing is controlled by computer which senses changes in environment and can adjust, so it's making durn near 90% of it's peak at any given point.
an 8 cylinder 5.7 liter displaced engine which is carb'd and can therefor only peak at around 75% of it's possible peak, can produce 340# of torque, but due to longer stroke increases the rate of work (HP) better, and presents an engine that produces 300hp as well.... problem: it can only produce this in conditions it was tuned in, and will fall off when those conditions change.
PC BYC, Holland, MI