Adam
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| posted on 18/7/07 at 07:23 PM |
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AIS .... Possible SVA problems ???
I'm trying to get my engine in a good state before i drop it in. I've sorted the wiring out but i'm still not sure on the AIS.
Should i remove it or should i leave it. I read in the Haynes manaul it helps with emissions? if this is the case should i leave it in to help with
the SVA and if i do how do i plumb it in as i'm not fitting the orginal air box? Any pointers would be great..... starting to get my head
round these engines now, been used to working on rotary's 
Cheers
adam
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amalyos
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| posted on 18/7/07 at 07:50 PM |
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I blocked off the AIS on my 5JJ R1, and had no problems with the emissions (2nd time round).
Others have had lots of problems, it seems very hit or miss, but I don't think the AIS has much to do with going through the SVA, as
you'll find a production bike probebly wouldn't meet the car requirements.
http://stevembuild.blogspot.com
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nitram38
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| posted on 18/7/07 at 08:06 PM |
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My understanding is that it allows air from the crankcase into the exhaust so creating a temporary oxygen increase to counteract the
"choke" (reducing emmissions) from a cold injection system.
I am leaving my engine well alone accept for a Cat and a Power commander.
Just make sure the engine is hot for emmissions and the valves on the system should be closed anyway.
[Edited on 18/7/2007 by nitram38]
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progers
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| posted on 19/7/07 at 07:06 AM |
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You need to block up the AIS for SVA. It puts air into the exhaust that will screw up lambda readings (i.e. you will not see the true engine exhaust
gasses).
It will make no difference to how the engine runs. To get through SVA you will need to lean off the engine - this can be done by leaning off the
ignition map (injected engine) or some kind of air bleed valves (for carbs). Talk to the kit suppliers they have helped many people through this
process.
You will need a CAT.
If you have a carb'd engine there is good advice here http://striker.r-one.co.uk/
under "SVA preparation". This site is a bible for any R1 builders.
Cheers
Paul
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Dillinger1977
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| posted on 19/7/07 at 07:27 AM |
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yeah i'd reccomend removing it or at least disabling it.
It lookes like it uses vaccuum from one of the carbs to control a valve. This has a tube thats connected to the airbox on a bike and splits into 4 to
connect to each exhaust output.
You can leave it connected, and if the engine is running you can feel the larger hose (airbox side) sucking air, so the simplest way to disable it
doing anything useful is to block that large hose. (i used a sva bolt covering cap and jammed it in!)
-Rog
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Adam
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| posted on 19/7/07 at 03:05 PM |
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Sorry forgot to put in my orginal post that it's a 2000 R1 engine. I think while the engine is out i will take it off.... just not looking
forward to tapping the holes where the 90 degree pipes come out  What do i do with the small pipe that runs round the fron of the engine, do i just
block that off too?
Cheers
Adam
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nitram38
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| posted on 19/7/07 at 03:52 PM |
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It is the same on the 05 injection but was fitted to improve emmisions. I still don't understand why it should be disabled!
After the engine is warm, it disables it's self.
A Power commander should be able to deal with this, or am I missing something?
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chockymonster
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| posted on 20/7/07 at 08:26 AM |
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It improves emissions on the bike, but the car emissions standards are much tighter, the extra air in the exhaust messes the lambda reading up.
As for blocking it up, I didn't tap mine, I used the pipes that connect the ais to the ports, cutting them about 3cm from the ports. I then
flattened the ends and sealed them up with metal weld stuff. It seems to be working fine.
PLEASE NOTE - Responses on Forum Threads may contain Sarcasm and may not be suitable for the hard of Thinking.
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nitram38
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| posted on 20/7/07 at 11:15 AM |
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I have an innovate wide band sensor on mine. Once the car is up and running, I'll do a few experiments to see what happens. It will be a while
yet!
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