K&N Air Filter Queries and Doubts

[rx100.7050]

Re: K&N Air Filter Queries and Doubts

Compression ratio is the amount by which the air-fuel mixture in the engine is compressed to during the compression stroke. So 10.4:1 means that 10.4 parts by volume of the mixture is compressed into 1 part before ignition.

Exactly!! It's not the mixture of Air and fuel.

[sniper]

Re: K&N Air Filter Queries and Doubts

Compression ratio is the amount by which the air-fuel mixture in the engine is compressed to during the compression stroke. So 10.4:1 means that 10.4 parts by volume of the mixture is compressed into 1 part before ignition.

[devils_friend]

Re: K&N Air Filter Queries and Doubts

A fuel injected engine does not necessarily flow more air-fuel combo than one with a carb. The R15 engine has a higher compression ratio (CR) at 10.4:1 compared to the 9.5:1 of the FZ. The R15, hence can produce more power with the same amount of air & fuel. However increased CR means more heat, which is too much for an air-cooled engine to handle, so its reserved for liquid cooled engines.

You getting it wrong brother. The CR of R15 is 10.4:1, this means that, for 10.4 units of Air you need 1 unit of fuel to help gain the required CR. Same goes for all the bikes. Generally for FI biked the CR will be on higher side.

TVS Apache RTR FI is air cooled bike. It dosent matter if the bike is 150cc or 200cc. The bike can be FI or Carb depends on how the company wants to position the bike in market. Pulsar 200NS is liquid cooled but with Carb.

Hope you get the point.

Cheerz!!

How does high compression allow more air?

Sent from my GT-I9001 using xBhp Connect mobile app

Explained above

Cheerz!!

[Bibhu]

Re: K&N Air Filter Queries and Doubts

The compression ratio of FI bike is higher than that of Carb fitted bike. Hope this helps

Cheerz!!

How does high compression allow more air?

Sent from my GT-I9001 using xBhp Connect mobile app

[sniper]

Re: K&N Air Filter Queries and Doubts

You cannot compare FZ and R15, both are different. R15 has Fuel Injection, so the amount of Air Fuel mixture going in the cylinder is more. This in turn produces more power as compared to a bike fitted with Carburetor. So, 150cc bike can be manufactured to produce power of 200cc bike and at the same time it can be manufactured to produce power of 110cc bike also.

Cheerz!!

A fuel injected engine does not necessarily flow more air-fuel combo than one with a carb. The R15 engine has a higher compression ratio (CR) at 10.4:1 compared to the 9.5:1 of the FZ. The R15, hence can produce more power with the same amount of air & fuel. However increased CR means more heat, which is too much for an air-cooled engine to handle, so its reserved for liquid cooled engines.

[devils_friend]

Re: K&N Air Filter Queries and Doubts

Can you please how a fuel injector allows more af mixuture to flow than a carburetor?

Sent from my GT-I9001 using xBhp Connect mobile app

The compression ratio of FI bike is higher than that of Carb fitted bike. Hope this helps

Cheerz!!

[Bibhu]

Re: K&N Air Filter Queries and Doubts

You cannot compare FZ and R15, both are different. R15 has Fuel Injection, so the amount of Air Fuel mixture going in the cylinder is more. This in turn produces more power as compared to a bike fitted with Carburetor. So, 150cc bike can be manufactured to produce power of 200cc bike and at the same time it can be manufactured to produce power of 110cc bike also.

Cheerz!!

Can you please how a fuel injector allows more af mixuture to flow than a carburetor?

Sent from my GT-I9001 using xBhp Connect mobile app

[gyan_recl350]

Re: K&N Air Filter Queries and Doubts

Its a common misconception. Instead of saying they draw more air, the better term would be that k&n filters allows the air to pass more easily thru the filter.

Off-course that would have been better term I agree. It is not a vacuum cleaner or suction pump that it would suck, only thing it allows air to pass more freely. Agreed. That was just put in haste.

i have a pulsar 200 ns and i have a conical type performance filter installed. No re jetting(jets were already big & similar to 220) , still power mileage both have increased, and no issues of carbon deposits on the spark plug or engine over heat, or similar issues related to running on lean mixtures.

How your mileage has increased can you explain until and unless you are running lean or may be too lean. Now if you are running lean (not idle A/F mixture) then how your power has increased? If power has increased then off-course you need to increase the fuel intake a bit to compensate for more air, then how your mileage has increased? I mean can both the things go hand in hand? I guess not. May be I am wrong, correct me with your inputs.

Sent from my GT-I9300 using xBhp Connect mobile app

----consecutive posts auto-merged-----

Air flow through a stock replacement filter (SRF) is dependent on the stock air box too. A SRF in a stock air box does not flow as much air as an open conical air filter fitted close to or directly on the carb. Therefore jetting is not required. Air flow can be increased by drilling holes on the air box cover. Then jetting is required in most cases.

Ok sounds logical. Then would we get any performance gain or not using them? I mean using SRF inside the Air filter box

[devils_friend]

Re: K&N Air Filter Queries and Doubts

Still the same. The power output of the bike is more that's it. Since r15 has 150cc capacity like the fz, amount of air intake would have to be same. There is no way that the r15 sucks in air in amounts compared to 220cc bikes. The cubic capacity is limited. For more power, the company will have played around with other factors since the cylinder is just 150cc.

Sent from my MT27i using xBhp Connect mobile app

You cannot compare FZ and R15, both are different. R15 has Fuel Injection, so the amount of Air Fuel mixture going in the cylinder is more. This in turn produces more power as compared to a bike fitted with Carburetor. So, 150cc bike can be manufactured to produce power of 200cc bike and at the same time it can be manufactured to produce power of 110cc bike also.

Cheerz!!

[abhi7013]

Re: K&N Air Filter Queries and Doubts

That is what even I am trying to convey . All 150 or any other CC are not universal to have universal filters

----consecutive posts auto-merged-----



Partially agree with you.... HOw about R15 and FZ then???

Still the same. The power output of the bike is more that's it. Since r15 has 150cc capacity like the fz, amount of air intake would have to be same. There is no way that the r15 sucks in air in amounts compared to 220cc bikes. The cubic capacity is limited. For more power, the company will have played around with other factors since the cylinder is just 150cc.

Sent from my MT27i using xBhp Connect mobile app

[Team Torque]

Re: K&N Air Filter Queries and Doubts

Shoes aren't universal fit . Also, cars have various cylinder configurations. So, my thinking is, universal fit is not possible for them.

Cheerz!!

That is what even I am trying to convey . All 150 or any other CC are not universal to have universal filters

----consecutive posts auto-merged-----

There might be only small variations in air intake volume depending on cc. But practically that hardly makes any difference. As it is, the filter would be allowing more air than the stock ones.

Sent from my MT27i using xBhp Connect mobile app

Partially agree with you.... HOw about R15 and FZ then???

[devils_friend]

Re: K&N Air Filter Queries and Doubts

Practically will a Size 8 shoe fit to a person who has Size 9 foot???. K&N have assorted filters for 4-wheelers but not for bikes. I prefer to go with Replacement filters but certainly not with UNIVERSAL. Just sharing my take

Shoes aren't universal fit . Also, cars have various cylinder configurations. So, my thinking is, universal fit is not possible for them.

Cheerz!!

[abhi7013]

Re: K&N Air Filter Queries and Doubts

Practically will a Size 8 shoe fit to a person who has Size 9 foot???. K&N have assorted filters for 4-wheelers but not for bikes. I prefer to go with Replacement filters but certainly not with UNIVERSAL. Just sharing my take

Size 8 and size 9 shoes in case of bikes would be like 150cc and 200cc+. The amount of air drawn in for a 150cc bike would be lesser than any other 200cc+ bike. Hence the filters for higher cc bikes have a larger surface area to let more air in. But variations in air intake within 150 cc category would not be that great. Like an fz and a hunk. There might be only small variations in air intake volume depending on cc. But practically that hardly makes any difference. As it is, the filter would be allowing more air than the stock ones.

Sent from my MT27i using xBhp Connect mobile app

[Team Torque]

Re: K&N Air Filter Queries and Doubts

My understanding is that, these type of Filters can fit all bikes of same segment. Also, the amount of air drawn will be same. But, the required output might vary from bike to bike.

(just a thought)

Cheerz!!

Practically will a Size 8 shoe fit to a person who has Size 9 foot???. K&N have assorted filters for 4-wheelers but not for bikes. I prefer to go with Replacement filters but certainly not with UNIVERSAL. Just sharing my take

[devils_friend]

Re: K&N Air Filter Queries and Doubts

I have a small query here. How can a single universal air filter be a fit for multiple bikes????. Yes I know that IT SAYS UNIVERSAL. But for instance: the 153cc of Yamaha FZ will not share same technical characteristics and output with that of a Unicorn or HUnk or anyother 150cc. Considering that, how do you THE UNIVERSAL FILTER is advantageous???

My understanding is that, these type of Filters can fit all bikes of same segment. Also, the amount of air drawn will be same. But, the required output might vary from bike to bike.

(just a thought)

Cheerz!!