Horsepower and Torque - GL1800Riders
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post #1 of 29 (permalink) Old 07-01-2011, 12:09 AM Thread Starter
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Horsepower and Torque

I am curious as to just what are the horsepower and torque figures for the GL1800. I am pretty sure that both are plenty good enough for most of us, but I would like to know the figures. Anyone got a good idea as to the numbers?
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post #2 of 29 (permalink) Old 07-01-2011, 12:29 AM
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2010 specs are quoted at 118 HP, 125 Ft/lbs torque

This Dyno run shows rear wheel at 93HP and 133ft/lbs at the one minute 11 second mark

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post #3 of 29 (permalink) Old 07-01-2011, 12:33 AM
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I think 120hp at the crank 100hp at the back wheel roughly same for the torque figures

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post #4 of 29 (permalink) Old 07-01-2011, 01:02 AM
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the 118hp and 125ft/lbs. numbers are from Honda and are measured at the crank.

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post #5 of 29 (permalink) Old 07-01-2011, 09:06 AM
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Can some knowledgeable engineer clarify the relationship of horsepower and torque? If torque makes the bike go, then what does horsepower do?

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post #6 of 29 (permalink) Old 07-01-2011, 09:20 AM
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Originally Posted by bluestone View Post
If torque makes the bike go, then what does horsepower do?
You use torque every time you twist the throttle.
You use horsepower once a month.

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post #7 of 29 (permalink) Old 07-01-2011, 09:48 AM
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horse power

Originally Posted by bluestone View Post
Can some knowledgeable engineer clarify the relationship of horsepower and torque? If torque makes the bike go, then what does horsepower do?
HP is how fast the bike will go.

Ie: timed torque.


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post #8 of 29 (permalink) Old 07-01-2011, 10:16 AM
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My 2010 has 104hp and 118ft/lbs torque at the wheel @ sea level 70 degrees.

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post #9 of 29 (permalink) Old 07-01-2011, 10:50 AM
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The magic of the GL1800 engine is that it is big and makes a lot of torque without having to spin fast, so it also lasts a long time. For useful power, you want a torque curve that jumps up off idle, goes high and stays flat as long as this one. Very few motorcycle engines will make 90 ft lbs...the GL1800 makes it from 1500-5500 RPM's. Notice also that the horsepower builds in a perfect straight line to 5500, making throttle response very predictable.

There's not much point in reving it past 5,500, since everyting is dropping after that.

They could have made it spin faster and breath better and it could make a lot more horsepower, but it would have to give up low end torque and durability. But, at what RPM do you spend most of your time on a touring bike?

(There is no replacement for displacement.)
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post #10 of 29 (permalink) Old 07-01-2011, 11:04 AM
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I asked that question to a very well known sprint car engine builder alot of years ago. Here's what he said.....

HP = Muhammad Ali rabbit punch
TQ = George Forman punch hitting then following through all the way to the floor.

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