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Old 06-10-2011, 10:49 PM   #1
Versatile337
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Why V4 engines in MotoGP

it's come to my attention that both Honda and Suzuki use V4 engines in motoGP. and before that Honda used a V5 while Yamaha still uses an I4 but with a weird cranking order that emulates a v4's power delivery.

Can someone answer why V4 seems to be the popular choice in MotoGP and why there's not a lot of V4's on the market for sportbikes?
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Old 06-11-2011, 10:30 AM   #2
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You answered your own question as to why V4's in GP: power delivery. Even the one I4 has its crank configured such that the power delivery is more like a v4.

As to why no V4s in production bikes: complexity.

However, the "regular" I4s are getting so incredibly powerful that they're starting to get unrideable. I think over the next 5 years, crossplane crank motors and v4s will find their way into more production bikes.

The last part is personal opinion.
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Old 06-11-2011, 11:07 AM   #3
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Old 06-11-2011, 11:16 AM   #4
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Quote:
Originally Posted by po-po 5.0 View Post
You answered your own question as to why V4's in GP: power delivery. Even the one I4 has its crank configured such that the power delivery is more like a v4.

As to why no V4s in production bikes: complexity.

However, the "regular" I4s are getting so incredibly powerful that they're starting to get unrideable. I think over the next 5 years, crossplane crank motors and v4s will find their way into more production bikes.

The last part is personal opinion.
there are and have been v-4's in production bikes, and they aren't any more complicated than any other engine. the manufactures produce what sells the most.
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Old 06-11-2011, 12:03 PM   #5
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Quote:
Originally Posted by witchdoctor575 View Post
there are and have been v-4's in production bikes, and they aren't any more complicated than any other engine. the manufactures produce what sells the most.


I'm hoping the V4 makes a comeback.
I'd make room in my garage for a modern V4 superbike from Honda.
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Old 06-11-2011, 12:25 PM   #6
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Power AND power delivery, I would think. Seemed to work OK for Aprilia last year, and Yamaha before that.
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Old 06-11-2011, 12:45 PM   #7
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Rumors are that honda may use the same tranny in it's production bikes next year that they use in their MotoGP bikes. But yeah, the older VFR750 was a V4. Might be with the whole "people buy what they are familiar with" situation. It would be a big risk to switch, say, the CBR1000 from an I4 to a V4. If people stayed away from it it would really hurt the company. Look at Aprilia, all the magazines rave about the RSV4 but I have yet to see one on the road. Unfamiliar, as far as customers are concerned, territory.
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Old 06-11-2011, 12:53 PM   #8
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The V4 is narrower than the I4. This also reduces drag for top end.
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Old 06-11-2011, 01:45 PM   #9
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I saw a v5 tearing up the track in a vid great
if that would make it to the street. Would actually make me want a honda
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Old 06-11-2011, 01:54 PM   #10
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Quote:
Originally Posted by Chuckster View Post
Rumors are that honda may use the same tranny in it's production bikes next year that they use in their MotoGP bikes. But yeah, the older VFR750 was a V4. Might be with the whole "people buy what they are familiar with" situation. It would be a big risk to switch, say, the CBR1000 from an I4 to a V4. If people stayed away from it it would really hurt the company. Look at Aprilia, all the magazines rave about the RSV4 but I have yet to see one on the road. Unfamiliar, as far as customers are concerned, territory.
I had a vf1000r in the 90s. My first sportbike. It had top end oiling issues though, had to dump it when the cams wore down. Great power though but it had a 16" front tire turned waay to fast
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Old 06-11-2011, 03:33 PM   #11
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Quote:
Originally Posted by witchdoctor575 View Post
there are and have been v-4's in production bikes, and they aren't any more complicated than any other engine. the manufactures produce what sells the most.
twice as many heads, twice as many cams, twice as many cam chains, and a more complicated exhaust routing. How are they not more complicated again? Yes I realize there are v4 motorcycles in production, but none (save the new Aprilia) make the power or meet the price point of a I4 litre.
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