Inline 4s

Originally Posted by fizzwheel

I'm quite prepared to admit mine was a little tired with 36K on the clock, but thats still how it felt, I never really found any useful benefit about revving all the way to the limiter, used to change at 9K ish, but was definately on its way to feeling flat in terms of performance at that point.

Liz's pointy seems to feel like it rev's a bit harder for longer from memory but its so long since I've ridden that my memory is hazy.

Thing is to compare the two.

8K in 6th on the SV, compared with 8K in 6th gear on the GSXR, the GSXR feels hell of a lot more eager at that point than the SV ever did. Just surges forward whereas the SV to me in comparision feels slow.

I think this is more to do with the fact that the GSXR is twice the BHP of the SV. Rather than comparing IL4 with a twin.

You can't compare the two, an SV at 8000 revs is nearing peak power, a GSXR is just getting going, midrange is not in the same place, and your gixxer is a 750. Just as it wouldn't be fair to compared a 600 IL4 with an SV at 4000 revs.

I think we've concluded this debate many times on the forum, and the conclusion is it depends how you ride it and what you expect from the bike. If you want a bike to go mental and start building up past 100bhp 'cos you are at 8k revs an SV will disappoint. If you want to do an overtake without changing gear at 4000 revs a 600 IL4 will disappoint. Just look at the guy above complaining that a Fazer with an R1 engine didn't have enough power.

Originally Posted by hardhat_harry

Power falls away at 9500 on my graph

There are two graphs on there, one pointy, one curvy. And that's not a "fall away", it's a tiny drop of a couple of BHP.

[mikerj]

Originally Posted by -Ralph-

There are two graphs on there, one pointy, one curvy. And that's not a "fall away", it's a tiny drop of a couple of BHP.

Indeed, and just to put this one to bed, have a look at the dyno plots for all the popular middleweight bikes in 2006, at 8000RPM not even the Daytona 675 is producing as much torque as the SV650. The GSX-R is a good 10 lbft down over the SV at this point.

I think it's safe to say that if your SV isn't pulling hard at 8k then it's either restricted or there is something wrong with it.

Originally Posted by mikerj

Indeed, and just to put this one to bed

Ha, ha, you reckon?

Originally Posted by mikerj

Indeed, and just to put this one to bed, have a look at the dyno plots for all the popular middleweight bikes in 2006, at 8000RPM not even the Daytona 675 is producing as much torque as the SV650. The GSX-R is a good 10 lbft down over the SV at this point.

I think it's safe to say that if your SV isn't pulling hard at 8k then it's either restricted or there is something wrong with it.

The trouble with comparing dyno graphs, is that you are comparing a bikes output at a fixed point in time. Open the throttle from a steady speed at 8000 revs and within a few seconds your doing 9000 revs, a few seconds later you are doing 10000, now go back to the dyno charts and see how the SV compares at 10000, only a matter of a few seconds after you opened the throttle.

This may be why people say the SV "tails off", it doesn't tail off it stays the same, whereas by comparison the IL4 continues to build and build more and more power.

[fizzwheel]

Originally Posted by -Ralph-

The trouble with comparing dyno graphs, is that you are comparing a bikes output at a fixed point in time.

Yup, but the graph only tells you the BHP & Torque at that point. What you cant graph or draw up, is how it feels to a rider.

My curvey felt flat after riding the GSXR, like I said in another thread, I opened the throttle, it made some more noise, vibrated a bit more and didnt feel like it was accelerating. Note I said "didnt feel like it" because it didnt, it felt sluggish and slow. You cant replicate how it felt to me using a dyno graph to point out peak torque etc etc etc.

Which is back to Ralphs point about how we all like different things...

Originally Posted by fizzwheel

Yup, but the graph only tells you the BHP & Torque at that point. What you cant graph or draw up, is how it feels to a rider.

My curvey felt flat after riding the GSXR, like I said in another thread, I opened the throttle, it made some more noise, vibrated a bit more and didnt feel like it was accelerating. Note I said "didnt feel like it" because it didnt, it felt sluggish and slow. You cant replicate how it felt to me using a dyno graph to point out peak torque etc etc etc.

Which is back to Ralphs point about how we all like different things...

Were you replying to me or mikerj? 'Cos we just said exactly the same thing in different words.

[fizzwheel]

Originally Posted by -Ralph-

Were you replying to me or mikerj? 'Cos we just said exactly the same thing in different words.

Dunno, just waffling really

I hope you're all looking at the torque on that graph I posted, not the HP... remember, torque is the thing that's going to give you that shove. And it does tail away after about 8k.

I owned a K3 for a year, and have ridden a mate's K7, and they both felt the same - even though the K3 was my first bike, and therefore it was the fastest thing in the world to me, I could STILL tell it dropped off. Yes you could get to the redline, but it had more of a punch up to ~8k.

Originally Posted by mikerj

You miss the point, if both were burbling along at 3k then you would need to drop a gear or two to get your 600 up to 8k. It's no longer instant shove.

??
Why would you burble along at 3k?

I have said this before about all engine configurations, be it twins, triples or 4's- Don't get hung up on the tach numbers! You use an engine wherever it is happiest i.e not labouring or over-revving. The only people who get hung up are the V-twin owners who say:

"Well, I travel in 4th gear at 4k rpm and it is 40mph, but when I do the same on an IL4, it is gutless"