How-to: completely remove AIS

[Jamesf100]

Just a tip to the wary. You are correct in how to remove the AIS. However one interesting note is that once you do that the upper end (cam shaft area) cannot breath.

When I remove mine, I will actually put tubes to a breather container.

Why you may ask. To prevent pressure build up. It could be possible to cause positive pressure in the top-end which could rob HP and pop the occasional valve cover gasket. It was not uncommon in hi-perf motors to pressure their bottom ends and blow out seals. The pistons moving up and down create an effect called windage. Suzuki pioneered a piston crankshaft lower case design to prevent just this from happening.

Two cents worth..........

[tracker]

Originally Posted by Jamesf100

Just a tip to the wary. You are correct in how to remove the AIS. However one interesting note is that once you do that the upper end (cam shaft area) cannot breath.

When I remove mine, I will actually put tubes to a breather container.

Why you may ask. To prevent pressure build up. It could be possible to cause positive pressure in the top-end which could rob HP and pop the occasional valve cover gasket. It was not uncommon in hi-perf motors to pressure their bottom ends and blow out seals. The pistons moving up and down create an effect called windage. Suzuki pioneered a piston crankshaft lower case design to prevent just this from happening.

Two cents worth..........

Get to work! You are already faster than 99.9% of the riders here. Let us get secrets to try to keep up with you!

[TEZZMIN]

Originally Posted by Jamesf100

Just a tip to the wary. You are correct in how to remove the AIS. However one interesting note is that once you do that the upper end (cam shaft area) cannot breath.

When I remove mine, I will actually put tubes to a breather container.

Why you may ask. To prevent pressure build up. It could be possible to cause positive pressure in the top-end which could rob HP and pop the occasional valve cover gasket. It was not uncommon in hi-perf motors to pressure their bottom ends and blow out seals. The pistons moving up and down create an effect called windage. Suzuki pioneered a piston crankshaft lower case design to prevent just this from happening.

Two cents worth..........

I get what your saying but the way the reeds are designed they only let air in and not out so I don't see how that can help the cam shaft area breath or release pressure? Please explain. I am willing to learn.

[j-dubr6]

I have a question and a comment.

First Im not sure but I dont believe the top end or camshaft area vents into the IAS. I think it vents just like the bottom end vents, throuth the crankcase ventalation hose at the rear of the block. From there it is pulled into the air box.

With that said, couldnt you remove all the AIS components, leaving the reed valves totaly intact, and rerout the crankcase ventalation hose to the AIS inlet ports.

Theoretically wouldnt this create a slight vacuum in the crankcase thus improving ring seal and performance.

I have heard of a similar mod for the Suzuki gsxr.

any input would be great.

[TEZZMIN]

Originally Posted by j-dubr6

I have a question and a comment.

First Im not sure but I dont believe the top end or camshaft area vents into the IAS. I think it vents just like the bottom end vents, throuth the crankcase ventalation hose at the rear of the block. From there it is pulled into the air box.

With that said, couldnt you remove all the AIS components, leaving the reed valves totaly intact, and rerout the crankcase ventalation hose to the AIS inlet ports.

Theoretically wouldnt this create a slight vacuum in the crankcase thus improving ring seal and performance.

I have heard of a similar mod for the Suzuki gsxr.

any input would be great.

I agree that the top end does not vent through the AIS do to the fact the reeds are designed to only let air in and not out. I have heard of venting the crankcase into AIS inlets but I would have a few concerns about that. The first thing I heard is you need to clean out your reeds periodicaly of small oil deposits. My main concern would be if for some reason you over revved or strained your engine and it released a good bit of oil through the crankcase what would happen with it going through the reeds like that? I only ask because I had it happen once and it shot oil into the air box creating a huge white cloud and sputtering. It could have been allot worse if.

[20lb.teg]

I will post more about it later as I just got home from my second job and I have to be back there at 7:00 AM tomorrow. But venting the top end DOES yield positive results... I have been doing it for years on my cars. Here is some pictures from another companies motors... Notice the same type of design. The hoses come from the valve cover and into a breather tank as originally said... Again I will not leave you hanging I will post a lot more technical info on it tomorrow. Now the pics...



Later,

Sean C.

[TEZZMIN]

Originally Posted by 20lb.teg

I will post more about it later as I just got home from my second job and I have to be back there at 7:00 AM tomorrow. But venting the top end DOES yield positive results... I have been doing it for years on my cars. Here is some pictures from another companies motors... Notice the same type of design. The hoses come from the valve cover and into a breather tank as originally said... Again I will not leave you hanging I will post a lot more technical info on it tomorrow. Now the pics...

Later,

Sean C.

Cool.. thanks, looking forward to the other pics and how to. So if you do this on the R6 you would need to completely remove the reeds because they are designed to let air in not out? Thats the only reason I question what Jamesf100 said about possible damage. By removing the AIS I don't see how it will affect the engine breathing.

[Cever]

Just a question for the experts. In theory if you do this mod and then have your bike dyno tuned according to the A/F would the bike not appear to be richer than it actually is and therefore causing the tuner to lean the bike considerably?

[TEZZMIN]

Can't say how it affects the readings but some tunners just clamp the hose shut while on dyno.

[TEZZMIN]

Originally Posted by 20lb.teg

I will post more about it later as I just got home from my second job and I have to be back there at 7:00 AM tomorrow. But venting the top end DOES yield positive results... I have been doing it for years on my cars. Here is some pictures from another companies motors... Notice the same type of design. The hoses come from the valve cover and into a breather tank as originally said... Again I will not leave you hanging I will post a lot more technical info on it tomorrow. Now the pics...
.

You have my interest. Bumpity bump..