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What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 12:26 am
by Hog Guts
540 options.... Want wide deck from what I've been told a bit less expensive for parts. Angle valve or straight? Not sure if having the lighter motor on 13 ft boat better than go gain of av or not. Your thoughts?


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Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 2:26 am
by ptr34
Go 350 hp ecotec be a little lighter and 50 to 90 more hp.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 6:22 am
by lariat
I don't know that you would be able to see the difference either way. I have a SV and my two buddies that I usually run with have very similar boats, but one has an AV, and the other has an upstack. There is very little difference between the three. There is no where one would be able to go and not the other. Mine is actually the quickest out of the hole of the three.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:26 am
by Hog Guts
I've considered the Eco but at 5k more it's hard to justify even with fuel savings. Are my dollars off?


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Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:34 am
by sidejobs
It's hard to beat a good sv 0540 for power and reliability. I think you would be pleased with one on the boat you have.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 8:05 am
by ptr34
13375 for engine/gearbix/prop. Depends where u are getting 540 from . Around 9500 for one from a reputable engine builder. Sell ur prop off ur boat for 1500. And ur only 3000 off. And u can run regular fuel and get parts from parts store. And it has a 1 year warranty

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 8:13 am
by fl cracker
S/V 540 with 10-1.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 8:51 am
by John Fenner
fl cracker wrote:S/V 540 with 10-1.
X2!

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 9:04 am
by Outlawaircraftengines
straight valve 540. You cant go wrong.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 11:08 am
by getchasumairboats
Straight valve is hard to beat they are tough engines.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 3:12 pm
by FLA BOY
Don't forget to figure in Av gas vs. pump gas w/ Av being almost twice as expensive. W/ 10:1 it will run great, but you will HAVE to run the good stuff. I personally am a A/C guy. My dad runs a A/V 540 w/ low compression pistons and has never ran Av gas and has been running the same engine for 20+ years and has never opened it up or had any cylinder problems. The Eco's certainly are intriguing, but it's hard to beat the look and sound of an AV 540.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 4:48 pm
by fl cracker
You figure a dollar more per gallon. I payed 4.35 per gallon for 100ll. That would be about 20 bucks more every time I bought fuel. A lot of C/M's have 40 or more gallon tanks. That's not really a selling point in my eyes. Convenience of buying A/V gas and Oil would be at the top of concerns. My current boat runs great but next time I'll have another C/M!

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 4:59 pm
by ptr34
But a ecotec doesnt need a 40 gallon tank like a regular cm does. And then they dont burn that much fuel . So I would say its more than 20 bucks. Because thats cheap for avgas. It over 5 where I get mine

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:14 pm
by FLA BOY
fl cracker wrote:You figure a dollar more per gallon. I payed 4.35 per gallon for 100ll. That would be about 20 bucks more every time I bought fuel. A lot of C/M's have 40 or more gallon tanks. That's not really a selling point in my eyes. Convenience of buying A/V gas and Oil would be at the top of concerns. My current boat runs great but next time I'll have another C/M!

Where is Av Gas $4.35/ gallon?? I would stock up! It is $5.99/ gallon here.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:23 pm
by ptr34
And looking in classified the schimdt 540 is 12900. Jamie wants 12000 for his and another one for 11500. So thats closer to my 13375 for 350 hp pump gas special lol

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:45 pm
by Seven3
Each type of engine has it's pros and cons. There are boat types that are better off running CMs, then there are boats that are better suited for an AC.

But an undeniable fact is there is a certain 'cool factor' that comes from having an aircraft engine. When I filled my boat up yesterday, a guy who knew nothing about airboats at the pump asked me what kind of engine was on it. When I told him it was out of an airplane he thought it was the coolest thing. I'm sure if I had said "It's a 4 cylinder out of a Chevy Malibu" he would've been a lot less interested lol.

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:50 pm
by getchasumairboats
ptr34 wrote:But a ecotec doesnt need a 40 gallon tank like a regular cm does. And then they dont burn that much fuel . So I would say its more than 20 bucks. Because thats cheap for avgas. It over 5 where I get mine


So why haven't you sold your A/C engine yet ?

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:53 pm
by getchasumairboats
ptr34 wrote:But a ecotec doesnt need a 40 gallon tank like a regular cm does. And then they dont burn that much fuel . So I would say its more than 20 bucks. Because thats cheap for avgas. It over 5 where I get mine


So why haven't you sold your A/C engine yet ?

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:54 pm
by ptr34
Because its my baby. Ill have ecotec to ride soon. And the star will get new revo hull

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 5:59 pm
by HAMMERHEAD
to answer your initial question 50 pounds lighter AND 40 more horsepower!

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 6:04 pm
by signcoc43
Id love to find a geared 480 like terrys motor than a 540

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:11 pm
by Tony480
FLA BOY wrote:
fl cracker wrote:You figure a dollar more per gallon. I payed 4.35 per gallon for 100ll. That would be about 20 bucks more every time I bought fuel. A lot of C/M's have 40 or more gallon tanks. That's not really a selling point in my eyes. Convenience of buying A/V gas and Oil would be at the top of concerns. My current boat runs great but next time I'll have another C/M!

Where is Av Gas $4.35/ gallon?? I would stock up! It is $5.99/ gallon here.
At the airport in Apopka

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:17 pm
by Bruce
go av 540 why not have the extra ponies and better cylinders not to mention an av just looks cooler if you can swing it dont buy somethin off the back of someones boat that has had the snot run out of it then got a degreasing and krylon overhaul lots of snakes out there

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:48 pm
by Hog Guts
Thanks for all the feedback. I know all this has probably been discussed a thousand times, but when I'm about to spend the money I like direct answers :)

So I've spoken with lots of folks and the general consensus is O-540 Straight Valve Wide Deck. I think thats my current direction. Next item of interest is the pistons. There are basically standard ones then 10:1 higher performance. I'm on the fence with the AV gas. If thats what it takes then I'll deal with it, but I have to tell you being able to stop at any gas station between here and there is nice without having to go out of the way tot he airport - forget the price difference, its the convenience more than anything. Is it good for the engine? Seen those threads don't need to go there again. I used 93 in the 520 but I Its sorta weird saying it worked fine after my motor unraveled the other day - even though that had nothing to do with it.

Is it worth the difference going 10:1 pistons? Does it make the motor any less dependable? Whats it do for me performance-wise? If I really can drop 93 in the lower compression engine if I happened to be in BFE etc it would be nice to know I could...

Re: What's better, 50# lighter or 40hp more?

Posted: Mon Dec 01, 2014 7:52 pm
by ptr34
10:1 will need avgas for sure. Plus you add cost of 1500 for pistons. If u get new ones