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| St0rmer66 |
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St0rmer66
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 Posted: 15:03 - 04 Jan 2008  Post subject: KTM RC4 - 78bhp, 132kg. |
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https://www.motorcyclenews.com/MCN/News/newsresults/mcn/2007/November/november-26-30/nov3007ktmrc4detailsrevealed/
Okay, so it's from MCN. And actually it's not even new, I just found it that's all.
But if it is in fact real (the prototype clearly is) then it would be perfect for the road. Of course that's assuming it's a road tuned engine, if it's taken from an off road competition bike then the service intervals will be terrible and all of a sudden it wouldn't be so great. I expect the 78bhp is at the crank and quite exaggerated though so it could be fine! The KTM 690SM makes 63bhp apparently, so if 78bhp at the crank is correct then it's definitely possible that it's similar bhp at the wheel and therefore a road going engine.
Looks like with the Mito500 (or 650twin now?) there might eventually be a whole class of lightweight sportsbikes without the huge unusable horsepower of a 600 IL4. Good news I reckon!
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| Fawbish |
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Fawbish
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| Posted: 17:00 - 04 Jan 2008 Post subject: |
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Id think about one, just to be different  sounds pretty cool, might be a bit...vibey, for a sports bike? Thoughts?
Its not unusable! You just arent going fast enough 
lol jk 
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| Wave2k |
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Wave2k
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| G |
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G
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| St0rmer66 |
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St0rmer66
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| Posted: 19:45 - 04 Jan 2008 Post subject: Re: KTM RC4 - 78bhp, 132kg. |
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| Fawbish wrote: | Id think about one, just to be different sounds pretty cool, might be a bit...vibey, for a sports bike? Thoughts?
Its not unusable! You just arent going fast enough
lol jk |
Might be a bit vibey at low revs, but at higher revs it will probably smooth out. They use single cylinder bikes in several smaller racing series already. Google "supermono" for some examples.
| wave2k wrote: | I found my 600 IL4 a bit gutless. |
Exactly my point, they're clearly not gutless though as you can see from lap times which aren't all that far behind 1000cc IL4's.
| G wrote: | ]You need to learn to turn the throttle. Oh and not buy a Honda  .
If it's a 650cc single making 78hp it's going to be in a pretty serious state of tune. I don't think any of the LC4 engines they sell make near that really, in whatever state of tune. |
Well as I said, 78bhp is probably very optimistic. I expect they will just use the 690 engine (actually 654cc) but with different cams and fuel map etc to get a bit more top end power. But if the power was similar to a 400cc IL4 I would be happy. It doesn't make much sense for them to release a sportsbike which can't be used on the road, they're trying to take a bigger chunk of the on-road market and have been for a few years now.
Other articles on MCN say it will be released in 2009, along with a leaked document from KTM that was given to investors saying which bikes are going to be released in the future (up to 2009).
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| Itchy |
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Itchy
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| Posted: 20:02 - 04 Jan 2008 Post subject: |
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Sounds kinda like the RS250, ie 2 smoke 60ish BHP explosively tuned RGVs are alledged to be 65bhp and only 135 kilos.
Hey if you take my bodge ie run it on 2 stroke oil it'll never seize !.
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| Wave2k |
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Wave2k
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| St0rmer66 |
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St0rmer66
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| Posted: 21:22 - 04 Jan 2008 Post subject: Re: KTM RC4 - 78bhp, 132kg. |
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| wave2k wrote: | Thats irrelavent as thats track, im not saying they are slow, you just have to rev the absolute bollocks off them to make them move, because below that they are gutless.
its more in terms of torque than absolute power than makes them gutless in my opinion.
But to be fair before i owned a 600 when i test rode one i though they were quick. |
Not completely irrelevant, just an easy way to compare and measure their speed that's all.
To be fair, you are probably "desensitised" to the speed of a 600, they are by no means slow but you have experience of faster bikes that will make them seem it.
In terms of the power being unusable, I mean both with how the power is delivered (as you say, need constant high revs) and the peak power. You can't reasonably keep the revs that high all the time and in terms of raw power they can do over 160mph in most cases with the maximum speed limit on our roads being 70mph. Okay, so nearly everyone breaks the speed limit, but not by that much very often! You cannot possibly reach the limits of a 600cc IL4 engine whilst on the roads for more than a few seconds (unless it's on a no speed limit road in IoM, Germany, etc) without losing your license or ending up in a wooden box under the ground.
I could go all "G" on you about the torque, but I'm sure you've heard it a million times already. They have plenty of torque, just not a decent spread .
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| Itchy |
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Itchy
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| Posted: 21:33 - 04 Jan 2008 Post subject: Re: KTM RC4 - 78bhp, 132kg. |
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| St0rmer66 wrote: | Okay, so nearly everyone breaks the speed limit, but not by that much very often! You cannot possibly reach the limits of a 600cc IL4 engine whilst on the roads for more than a few seconds (unless it's on a no speed limit road in IoM, Germany, etc) without losing your license or ending up in a wooden box under the ground.
I could go all "G" on you about the torque, but I'm sure you've heard it a million times already. They have plenty of torque, just not a decent spread . |
I reckon I came pretty close in France , north of Grenoble running for a hotel room ,
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St0rmer66
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| Fawbish |
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Fawbish
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| Posted: 14:20 - 05 Jan 2008 Post subject: |
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I dunno if its just me (definitely not, but seems it sometimes) but I like that theres a big rev range to play with on a 6. Admittedly, your not pulling like a son of a bitch below 7/8 thou, but it makes it fun to be pushing the higher revs to be hitting that optimum power zone.
A single making 60-ish (are we agreed on that? if it has to be in a v high state of tune to make 78, I assume something around 60 is fairly achievable?) and weighing in at around 130kg will put it in the same league (hp per KG) as an RS250, RGV, KR1 etc, like Itchy said....yet you will have more usable torque throughout the smaller rev range, yes? (considering you arent making peak power on a stroker til 7/8 thousand + revs?)
In effect giving you better "grunt", but maybe a bit less top speed...I think.
Does this sound about right to everyone? Im quite curious.
On the road though, it sounds like it'll be a hoot...though being a single, might not have that "feel good, just came in pants" factor methinks.
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craigs23
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craigs23
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| ram_doom |
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ram_doom
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| Posted: 18:42 - 05 Jan 2008 Post subject: Re: KTM RC4 - 78bhp, 132kg. |
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If you were out, riding in a spirited manner, when would you be below 8k on a 600 anyway? I dont see the problem
Oh, and in comparison, a single has a very narrow range of useable power, which makes for lots of gearbox dancing. Too few revs, and they knock, rattle and grumble, without accelerating, then once you've gained another 15/20mph its time for another gear, before the rev limiter cuts in.
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Old Thread Alert!
The last post was made 18 years, 58 days ago. Instead of replying here, would creating a new thread be more useful? |
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