exhaust valve

[rsvdan]

My Dealer in the UK is advising that they will be suppling new bikes with the exhaust valve disconnected. They say it was installed just to pass noise tests and apparently they have done this with their demo bike and got smoother fueling etc at the lower revs.

Anyone have any thoughts on this.

Cheers

[Diablo1]

From what I've read on this forum, the exhaust valve system closes down and restricts noise and gas flow(?) when the bike is in neutral. When it's in gear, it opens up. If this description is accurate, and the valve opens up 100% all the time when in gear and at all throttle settings, then I would have to concur with your dealer - opening the valve full by disconnecting the control will not make the engine run poorly. However, all it would be doing would be to make the exhaust louder in neutral.

If the exhaust valve throttles up and down when the bike is in gear, then perhaps your dealer is on to something.

[Poussin]

Aprilia must have think this valve out.

I mean, they spent 23 milions EUR in engine + electronic developpement. I don't see why they have put this valve if it's useless.

Plus the valve does have a price, and adds to the price of the bike.

Just my 2 cents.

[rsvfourdave]

My Dealer in the UK is advising that they will be suppling new bikes with the exhaust valve disconnected. They say it was installed just to pass noise tests and apparently they have done this with their demo bike and got smoother fueling etc at the lower revs.

Anyone have any thoughts on this.

Cheers

Dan, I'm with diablo. I rode and studied the bike at silverstone and can confirm that in nuetral valve closed, in gear valve open. The only thing disconnecting will do is make it loud in nuetral.

The only thing i didn't check was if this happens in all the modes as I only checked it in Track mode. I rode it in road mode and sport mode but didn't check when stationary what was happening to the valve in the lesser modes.

Cant think disconnecting gives any advantage and can't think why a dealer would change a standard bike in this way before giving it to a customer.

[Jaguar]

Aprilia must have think this valve out.

I mean, they spent 23 milions EUR in engine + electronic developpement. I don't see why they have put this valve if it's useless.

Plus the valve does have a price, and adds to the price of the bike.

Just my 2 cents.

It's not useless if it makes the bike pass the noise test. The test is conducted at a set distance so, presumably, the bike is revved in neutral to the required revs (1/2 of max power revs, I believe).

[Rich22]

My Dealer in the UK is advising that they will be suppling new bikes with the exhaust valve disconnected. They say it was installed just to pass noise tests and apparently they have done this with their demo bike and got smoother fueling etc at the lower revs.

Anyone have any thoughts on this.

CheersMy dealer agrees so do I.

[Rich22]

I can say that the flapper open with cables disconnected is a good mod, feels even smoother pulling away.

[rsvdan]

I can say that the flapper open with cables disconnected is a good mod, feels even smoother pulling away.

Cheers for that Rich, is that in comparison to a Silverstone bike? I'm asuming now though that no distinct change in exhaust noise when changing from neutral to 1st? Do you do track days? just wondering about getting through the noise test?

Cheers Dan

[Rich22]

Dan

it's a comparison to the dealers demo bike and we both agree it seems smoother on pulling away and idling with the valve open. Strange as its meant to open when in gear anyway but that's how it seems!

Yes track days are a grey area but I'm going for an after market can soon as poss so that should have a removable baffle to sort the problem.No noise change now just sounds fantastic soon as you start her up, my mates are drooling.:cheers:

Where are you in sussex mate

[rsvdan]

I wonder if it is proper power valve, like the Yam EXUP then the degree of opening changes depending on revs etc so initially when you select a gear it opens say 33% and as the revs increase it changes where as now yours is fully open all the time.

Hopefully have a go on the dealer bike this afty an he has disconnected the valve as says it smoother upto about 4K then no diff.

I'm based in Pulborough in W Sussex

[Rich22]

I'm Brighton so have to arrange a meet mate

[rsvdan]

Yer defo, pretty local to each other.

Outta curiosity why did you get yours from In Moto in Croydon and not Bikers World East Grinstead??

Had my test ride today....they are good ain't they lived up to all my expectations and then some, very similar to my RSV-R but just a bit better all over, so felt comfy within a couple of mins, so sweet handling, very neutral and about the best balanced stable bike I've even riden, love the engine, full of character and if you didn't know it was a V4 I would think you would say it's a twin, very similar to the RSV in that you can ride it very lazy and use the torque or wind it up to get it screaming, and the noise it makes, like some barking devil monster and nice little pops and bangs on the over-run. Was well impressed with the fueling...exhaust flapper open, nice smooth pick-up.

Only a few negatives, found with the sun today the dash is very difficult to read, maybe a tinted double bubble screen may help, the seat is about the firmest I've ever sat on....need to eat more pies for a bit of padding!! and storage in the rear....just about enough room for a paper clip, wonder if there is a bit of room under the riders seat? Tail tidy has got to be a must and a slip on to get rid of the ugly exhaust. One major concern is over the swing arm linkage plates, they look identical to the ones on the RSV-R of which some have failed, the weak vertical section looks identical, wonder if they are the same dims as the RSV-R, whether they are or not they will be the very first thing to change!

Top bike though, Aprilia have made one seriosuly nice bit of kit!

[Ian_XX]

Depends on what you want. When Yamaha had the patent on the EXUP valve, the R1 was stronger down low with it closed, or partially closed, but once past the midrange it hurt the performance.

I installed a full system on mine and a jetkit and gained like 14rwhp from it, now granted it was weaker at say 4,000 rpms, and it ran like poop under 4,000 rpms at anything more than partial throttle.

Just depends on what you want. I'm sure the exhaust valve on the ape boosts low power and midrange power slightly. But I guess it depends on how they use it.

[Rich22]

Dan. i agree the clocks are hard to read but over this weekend i have got use to them, the boot is massive just room for the allen key you get as a tool kit:happy:
Don,t know about the swingarm thing:confused:
Exhaust yep got to go, tail tidy done mine, seat is hard but again use to that and I'm a slim jim! long rides may hurt but so far so good.

Sounds just great and so different from anything out there.

Love it!!

Meet when you get yours mate.

[rsvdan]

Don,t know about the swingarm thing:confused:

Did you own a RSV-R before?

If you look on the 2004-2009 section on here and to a search for "link plates" then you will see about the problems, for me looking at the weak link plates on the RSV4 on Saturday I just wouldn't risk leaving them as is, just a peace of mind thing.

Have a look at this thread and threads it links to

http://www.apriliaforum.com/forums/showthread.php?t=177082&highlight=link+plates&page=2

I know it's a very very small percentage of bikes but I am an engineer and don't like the Aprilia plates and when you look at the damage / scoring of the standard plates when you take them off then I feel happier with the my chunky replacement stainles steel ones. I also take the GF pillion so its not just my safety.

[Rich22]

Hi mate no I didn't own a RSV before but i think that thread is a little heavy so I'm gonna ignore it all unless i have reason not to.

:cheers: