tima

Hi, my question is more from a lay man's perspective. A bike reaching its max torque at low or high rpm why should I bother about it or how does it affect me or the bike?

For eg
iron 883 - 70Nm @ 3750rpm
st7 - 57Nm @ 6000rpm

Does it mean there are more chances of wear tear in bike due to higher revs?
Does the bike reaching max power at low rpm will have better pick up?

Thanks,
Amit.

Noor

Query approved

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pavanchirmade

IMO the IRON will have a massive wheelie inducing low end and will make speed faster in the lower revs itself and the pull that one experiences when accelerating will be more in the Iron. But the ST7 will make more speed in higher revs.

You won't have to rev the Iron much where as you will have to rev the ST7 to get out!


This is completely what I think and may be wrong. Experts please comment.

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antz.bin

The power delivery is different. The one on the Iron 883 will be similar to a Bullet 500 CI(only replaced with more pulling power obviously)
The ST7 in comparison will be similar to a ZMA in nature(But only muuch faster). But the natures will be similar.

The fact that you have to rev the ST7 a bit higher to get into the power band has nothing to do with the wear and tear. The bike's engine is designed to be run at higher revs in the ST7's case. If you are thinking about the ST7 over the Iron, you have my full support(if it counts ) the ST7 is truly a delight to ride.

And it will at least have a tank range which is much more than the Iron. I mean, for a 12.5 litre tank, the fuel stops would be much more frequent than pee-pee stops when on a longish ride.
It also happens to have much superior Ground clearance which means you can enjoy more and worry about the speed-bumps and pot-holes less.

Also, if this interests you, since the torque on the ST7 peaks over 4.6k RPM, it might actually have more BHP than the Iron/Superlow. The Might was there because HD do not reveal Horsepower figures on their bikes. Only torque.

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riot

Max torque at lower revs is good for touring bikes. U get max pulling power from really low revs. U can carry more luggage and it is effortless to cruise.

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tima

Thanks Guys.

Ha ha Actually initially I thought of not mentioning bike names. I was worried discussion will go there There is a thread here discussing that Harley Davidson SuperLow or Hyosung ST7
But yes I am also leaning towards ST7

Thanks. hmm.. I think that also means IRon will go up the mountain more easily than ST7?

antz.bin

Not 'more easily' per se.. both have enough torque to climb a mountain with luggage mounted. However, the Iron will go up a slope better if there are no potholes / bad roads involved.

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Garry_rxz

Depends ...whether its a hill climb race, or just a tour uphill

Samarth 619

Today's level of tuning means that one cannot derive much facts from the Max Torque figures.
Specs sheets and real experience is much different guys.

A bike may have 60 NM Torque @ 7000 rpm, but it may have
12 NM @ 2000 rpm, OR
maybe 5 NM @ 2000 rpm OR
maybe 35 NM @ 2000 rpm, all dependent on tuning, technology and cc's.

The initial figure 60NM @ 7000 rpm is of no use for your analysis of the engine, if you ride at 2000 rpm generally.

What you can derive from Max Torque's rpm is your cruising requirement.

If you generally cruise on highways at a speed of 80 kmph, try finding a bike which makes 80 kmph in top gear at the rpm on which it produces maximum torque. In other words, you should be on your Max torque rpm for cruising, specially with baggage for maximum push, to the throttle's input.


If you commute more than touring, try getting a bike with least max torque rpm for quick traffic boosts.
Like Suzuki Zues which used to give 10 NM @ 3000 rpm only. Which means at this speed, its engine gives maximum buck for the throttle.

tima

Thanks Samarth, makes lot of sense.