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-   -   K&N Air Filter and Snorkel Removal ( https://www.xt660.com/showthread.php?t=9224)

tripletom 25-02-09 17:16

Quote:

Originally Posted by Gas_Up_Lets_Go (Post 83954)
I guess it depends on where you ride, but doing this would lower your wading depth, and I think I'd be concerned with water ingress in heavy rain, it does stream acrosss the side panel - when it's biblical, like it usually is up here!

I did it to my TTR, gave loads more response, but I lost too much depth in water, so I replaced it with the stock one.

Agreed, I've run pod filters on bikes in the past and had the joys of rain water entering the system. I had in mind a louvered cover of some sort to help prevent water ingress, though not sure which way you'd fit it for best results!

tripletom 26-02-09 20:44

So the K&N arrived today, nice fast service can't fault it.
I popped the seat off and took the old filter out, stuck the new one in and had a look at the snorkel set up. A testing twist revealed the snorkel could be removed from the retaining plate. So removed it was-

http://i97.photobucket.com/albums/l2...s/DSC00306.jpg

Bolting the plate back on revealed the K&N was loose in the airbox even with the plate on. This was no good and I didn't want to cut the snorkel about "just in case" ;) so after some shed searching I found some old fuel line and vacuum hose.
These were formed into doughnut shapes and a bit of insulation tape applied to ensure things stayed as they were-

http://i97.photobucket.com/albums/l2...s/DSC00307.jpg

I dropped the filter back in and placed the doughnut over the top then sat the plate in place before tightening everything back up-

http://i97.photobucket.com/albums/l2...s/DSC00308.jpg

Job done, without damaging anything and without spending 46Euros on an OTR plate :)

maxwell123455 26-02-09 20:59

Good bit of home made engineering.

tenere doug 27-02-09 08:31

Quote:

Originally Posted by tripletom (Post 84120)
... and I didn't want to cut the snorkel about "just in case" ;) so after some shed searching I found some old fuel line and vacuum hose.
These were formed into doughnut shapes and a bit of insulation tape applied to ensure things stayed as they were-
I dropped the filter back in and placed the doughnut over the top then sat the plate in place before tightening everything back up-
Job done, without damaging anything and without spending 46Euros on an OTR plate :)

I did have a rake about for something to susbstitute the rubber too, but in the end I just "Stanleyed" the snorkel off! At the end of the day, I just wanted peace of mind that it would seal, and stay put. If I ever sell it, I'll just get another snorkel, but that won't be happening any time soon..!

tripletom 27-02-09 11:26

Wasn't meant as a dig Doug. To be honest I'm going to refit the snorkel as I'm worried about lean mixture. I'll wait to open it up again til I can modify the fuelling with a PCIII or similar. I've got plans in the wings to build a new exhaust so will be needing to adjust the mixture definitely then.

tenere doug 27-02-09 12:39

Quote:

Originally Posted by tripletom (Post 84182)
... I'll wait to open it up again til I can modify the fuelling with a PCIII or similar

No worries Tom! Like you I'm waiting for Powercommander to sort out a PCIII for the Z, just to make sure it's running at it's best, but I've done a few miles now with the snorkel off, and it does feel better.

Biking 07-03-09 22:02

Quote:

Originally Posted by tenere doug (Post 84192)
No worries Tom! Like you I'm waiting for Powercommander to sort out a PCIII for the Z, just to make sure it's running at it's best, but I've done a few miles now with the snorkel off, and it does feel better.


I'm also running a dna filter without the snorkel. It runs very smooth. But I don't know if the mixture is to lean. Maybe Kev knows? There is a sensor in the exhaust. If the motor is running to lean this should correct it?

Kev 08-03-09 00:52

Quote:

Originally Posted by Biking (Post 85066)
I'm also running a DNA filter without the snorkel. It runs very smooth. But I don't know if the mixture is to lean. Maybe Kev knows? There is a sensor in the exhaust. If the motor is running to lean this should correct it?

It will only correct the fuel mixture when the O2 sensor is in the closed loop, that is when you are mostly on the cruise & at lower RPM. Other then that it will run a leaner A/F ratio.

The XTZ's A/F ratio is still unknown as I do not know of anyone running one on a Dyno to see what Yamaha have done with the fuelling.

JMo 08-03-09 01:13

Quote:

Originally Posted by josephau (Post 83930)
Call me completely untechnical and my physics didn't score very well in high school. I remember one said that if I have such K&N airfilter or any mods that "improves" the airflow, therefore, the fuel consumption would increase, 'more air burns more fuel', that's the logic. I thought about it a lot, and came to speculate that first we need oxygen, spark, and combustible materials to make a fire. If the spark is constant, then the amount of oxygen and combustible materials needed should be the same, so if more oxygen, less combustible materials needed, and vice versa. So wouldn't more airflow actually decrease the amount of required combustible materials which are gasoline in our cases here, assuming we hold the size of the fire or in our cases the power from the engine constant? Why I hold the power from the engine constant, because the fuel injection senses how much fuel the engine needs in order to keep the idling speed at 1500rpm on one hand, and the presumably optimal amount of fuel depending on the throttle position on the other. The fact is I have tried both the stock and K&N filter, and I have found the stock filter actually eats more gas than the K&N filter, but I just couldn't quite get my head around it. On power commander, am I correct that its main function is to manage the smoothness of power delivery but not so much on increasing power at any rpm?

Hi Josephau - I can see your thinking, but that's not quite right... the optimum burn ratio for a petrol engine is about 15:1 I believe, so if you have more air then you are going to need more petrol...

However, as the engine is arguably now working more efficently, you might find you use less throttle for a given engine speed/road speed, and therefore save fuel? Certainly the bike does feel a bit 'corked' as standard, so you tend to wind the throttle open harder than you might if it were breathing more freely?

I too would be interested to see how significant the change in fuel consumption is with the snorkle removed...

xxx

JMo 08-03-09 01:17

Quote:

Originally Posted by tripletom (Post 83942)
I was thinking about the air filter set up on the Ten last night after adjusting the chain. The plastic side panel I can't see being hideously expensive, and the DNA stage 2 filters for the X and R's is basically a sidepanel with a filter in to allow more air in, so it wouldn't be too hard to make a sidepanel with some filter in to give more air surely?

Hi Tom - I'm sure you've realised, but you are aware the side panel is on the post filter side? - ie. the original filter wouldn't be doing anything if you cut the side panel open, as the whole airbox is after the stock filter, so you'd have to put a filter in the side panel and seal it well (and may as well do away with the original)...

btw. the right hand airbox side panel is around a tenner... don't ask me how I know this x

xxx


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