Drilled Air Box ?

[fastdruid]

Originally Posted by Dave20046

Can't often hear mine over the snort

What other mods have you got? Much noteable change in performance?

I posted the full spec some time ago but to sum up

700cc (JHS, unknown amount of work[1][2])
BMC air filter
Akrapovic headers
Scorpion silencer
Geared down
*lots* of weight lost
USD frontend.

Just shy of 80BHP@rw.

It pulls like a train and tops out on park@cadwell.

Druid

[1] I bought the engine complete of someone going mini-twin racing who wanted a standard 650, came complete with a receipt for 1800quid for the engine work.
[2] The dyno guy said he thinks it has high compression pistons at the very least.

Don't forget guys 'n' girls any modification of your air box, filter will effect your insurance. Modification or performance enhancement needs to be declared, even a number plater change. Insurers are hot on finding a reason not to pay out! don't give them one!
That even goes for K&N filters, if you put them in you should let them know. Shouldn't effect your premium but if you don't declare you could find yourself in a spot of bother.

[dizzyblonde]

I have to run Suzy with a de snorkeled air filter and a Art race can, as it was dyno'd and re-jetted for it at Holeshot racing many years ago. TBH can't really see much performance enhancing going on.
However run her with a standard air filter and she runs like a bag of poo..did that once as an experiment, never again.

[jambo]

Curvy and pointy air boxes are very different designs.

But let's hold this thought for a sec. On the curvy if you drill holes in the air box you allow air to bypass the air filter. So your sandy gritty air is allowed past that lovely fine mesh, straight into the engine. That doesn't sound like a winning idea to me. On the curvy, a free-flowing air filter such as the BMC Race / BMC Race RS is as good as you want to go. Because the air intake at at the top of the air box, there may be a benefit in fitting tank raisers.

On the pointy I believe the air filter sits inside the air box seperating it into 2 halves (it's been a while since I've seen one open) so you probably could drill holes in some places without bypassing the air filter. I doubt this would help your power at all, but at least there's a potential for doing it without getting grit in the engine. As the air intake is at the front of the air box, not the top, tank raisers do nothing, but the SV1000 snorkel may help when combined with a free flowing air filter and a check for fuelling.

Jambo

Just to add to my previous comment, the standard airbox is probably fine for flow on a standard bike, perhaps a BMC filter might help a little if you also put a dynojet kit in to get the fuelling right, my bike is not standard and that is why there was a need to get more air going into the engine, this meant that the standard airbox/filter combination would not flow enough, on the pointy SV the filter is still doing it's job even with top of airbox removed, as for the noise well with a good exhaust system on the bike the noise seems to balance up just right with a combination of exhaust throb and induction roar.

You could also remove the lining off the bottom of the tank if you want more air into the Curvy airbox , I`ve heard of that being done . Probably just as pointless as the rest of it to be honest .

[Dave20046]

Originally Posted by fastdruid

I posted the full spec some time ago but to sum up

700cc (JHS, unknown amount of work[1][2])
BMC air filter
Akrapovic headers
Scorpion silencer
Geared down
*lots* of weight lost
USD frontend.

Just shy of 80BHP@rw.

It pulls like a train and tops out on park@cadwell.

Druid

[1] I bought the engine complete of someone going mini-twin racing who wanted a standard 650, came complete with a receipt for 1800quid for the engine work.
[2] The dyno guy said he thinks it has high compression pistons at the very least.

Sounds good!

[fastdruid]

Originally Posted by xXBADGERXx

You could also remove the lining off the bottom of the tank if you want more air into the Curvy airbox , I`ve heard of that being done . Probably just as pointless as the rest of it to be honest .

Yep, done that too. Noticed absolutely no difference but does remove the risk of it coming loose and blocking the airbox. Probably makes it a tadge louder too.

Druid

Originally Posted by fastdruid

Yep, done that too. Noticed absolutely no difference but does remove the risk of it coming loose and blocking the airbox. Probably makes it a tadge louder too.

Druid

Somebody on here had that problem a year or so ago didn`t they . The bike kept dying on them and it turned out to be a flappy loose bit of that lining , quick splash of contact adhesive and problem was sorted .

[fastdruid]

Originally Posted by xXBADGERXx

Somebody on here had that problem a year or so ago didn`t they . The bike kept dying on them and it turned out to be a flappy loose bit of that lining , quick splash of contact adhesive and problem was sorted .

The example I was thinking of was rather more than a year ago.

But then I've been here since the old forum.

Druid