Horse Power Question
- Thread starter hottank
- Start date
The V6 is built for longevity, reliability and running at steady RPMs for a long time where as the 800 twin is built for performance and the engine speed is all over the place.
Outboard see a much much much higher loading as a percentage of run time as compared to snowmobiles, or anything else for that matter. Also, the resistance to get the boat up on a plane is large, requiring lots of torque and hp in the middle of the rpm range in order to get the boat to top speed, where as a snowmobile really only needs lots of power in a narrow rpm band at the top.
Yes the outboards are built much sturdier and heavy, as the loading that are put on them are higher and for a much longer time.
Also, I would think the rpm operating window of an outboard is pretty narrow compared to that of a snowmobile.
Sleds = 1200 - 9000 rpm
Boat = 1200 - 5000rpm? I don't know what they rev out to..
It is like comparing a honda inline 4 to a chevy v8.
Yes the outboards are built much sturdier and heavy, as the loading that are put on them are higher and for a much longer time.
Also, I would think the rpm operating window of an outboard is pretty narrow compared to that of a snowmobile.
Sleds = 1200 - 9000 rpm
Boat = 1200 - 5000rpm? I don't know what they rev out to..
It is like comparing a honda inline 4 to a chevy v8.
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I agree with the tank. Sleds have been getting more HP. and also have been loosing weight now for years. The over rating is a possibility. Come on people how many times have you seen where a sled is advertised as lighter than last years model.
Hmm, pretty sure I answered your question. You asked why the bigger V6 has less power than a 800cc twin out of a sled and I told you.
I never said that Arctic Cats or any sled for that matter aren't built for longevity. But compared to an outboard engine they won't last as long. Think about it, how often does a person rebuild your average 800cc 2 stroke sled engine? Roughly every 1-2 seasons. How often does a person rebuild a 2 stroke outboard engine? Not that often last time I checked.
There is a lot more to making horsepower than just sheer displacement. Why doesn't an XR650 make more power than a CRF450? Simple, the XR is designed to run forever with mild power whereas the CRF is a race engine that Honda recommends rebuilding every X amount of hours (Gimpster would know this being the Master Honda Tech). The CRF is a much more aggressive design: hotter cams, timing, requires higher octane fuel due to the higher compression ratio and so on and so forth.
Theres a balance of reliability and all out power. A sled's engine is more power than reliability and the outboard is vice versa.
Am I clear enough for you padre?
It's a trick question.
Why would anybody want a V6 OMC?
Or a V4 OMC for that matter?
Hell, any OMC for that matter?
I'll guaranfreakintee that 800 Cat will start better at 30 below zero than that OMC will at 70 above zero!
Word that, OMC's blow. Wouldn't own one if it was given to me. I'll take a Yamaha or Mercury outboard anyday. 170hp 800Cat? 5500 rpm vs 8200 = more torque for the outboard and that is what is needed to get the boat up on plane. And yes, they can last for hours and hours into thousands of hours. And look at the exhaust system on the outboard, basic hexagon and restricted by the water.
heres an easy explanation...drag car makes 1000 hp..same motor built for nascar only dyno,s 600 hp...the 600 hp motor will go 500 laps easy..the 1000 hp drag motor will only go a few miles(1/4 mile at a time)..the more you rev a motor, the more power it makes...the shorter its life...period..now a boat motor will basically run a steady low rpm most of its life where a sled will run a much higher rpm for shorter periods of time...as an example my drag bigblock chevy dynoes 967 hp(at 11000rpm) with no nitrous...a like built daily driver big block I built dynoed 659 hp(at 8500 rpm)...that motor went 8 yrs in my driver..the race motor on twin pro fogger 500 hp kits(dynoed 1596 hp on 1 kit)got the topend looked at every 100 ft(mud racer making 100 ft. passes)....
Many outboards are restricted due to the engine and outdrive casing that limits the feasibility of a good expansion chamber exhaust system.
I bet even that POS OMC 150hp outboard compared to your 170hp snowmobile motor has alot more torque. HP is fun to talk about and it has it's place but torque is what does the work.
I've never seen a dyno sheet for a outboard motor but I would be shocked if they didn't have a higher torque number than HP number.
I've never seen a dyno sheet for a outboard motor but I would be shocked if they didn't have a higher torque number than HP number.
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