Mishimoto B9 S4/S5 Catch Can R&D Thread - AudiWorld Forums

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Mishimoto B9 S4/S5 Catch Can R&D Thread

 
Old 08-30-2018, 06:37 AM
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Default Mishimoto B9 S4/S5 Catch Can R&D Thread

Hello AudiWorld!

Nick here from Mishimoto! I'm starting this thread today to let you guys know that we are embarking on an engineering journey to create a direct fit catch can kit for the B9 S4 and S5. We just got our very green loaner in the shop yesterday and Jason was eager to get started!



I'll be sure to keep you guys posted on the progress. Also, feel free to shoot me any questions, comments or concerns you might have!

Thanks,
-Nick
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Old 08-30-2018, 06:41 AM
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Is there any demonstrated reason to have a catch can on this car? what problem are you solving?

On my Mk7 Golf R, the catch can was totally worthless, it just filled up with water mostly. Seems that modern engine designs have made the device pretty pointless but that didn't stop 10 manufacturers from coming out with one for that car....
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Old 08-30-2018, 07:41 AM
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What’s a “catch can?”
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Old 08-30-2018, 09:12 AM
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My understanding is that it's a device that tries to separate oil / liquid from the blow by before it gets recirculated back into the intake. The idea being to reduce carbon build up on the intake valves for direct injection engines.
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Old 08-30-2018, 10:09 AM
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Thank you, heymoe!
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Old 08-30-2018, 12:33 PM
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Looks like this was crossposted to both the B9 S4 & S5 forums, so I'm copy-pasting my reply to S4 thread here:

Hate to break it to you guys but the B9 S4/S5 already has an oil catch can/fine oil separation+recovery mechanism right from the factory. See pages 20/21 of this doument: https://www.yumpu.com/en/document/vi...5/ssp655-wg-en
Would certainly welcome clarification if I am missing something, but it seems to me that there is zero benefit to bypassing the factory system, and no need for an aftermarket oil catch can on this engine. Wouldn't mind seeing more pics of that car though...that is a serious green.
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Old 08-30-2018, 03:24 PM
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Old 08-30-2018, 05:49 PM
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Originally Posted by mplsbrian View Post
Looks like this was crossposted to both the B9 S4 & S5 forums, so I'm copy-pasting my reply to S4 thread here:

Hate to break it to you guys but the B9 S4/S5 already has an oil catch can/fine oil separation+recovery mechanism right from the factory. See pages 20/21 of this doument: https://www.yumpu.com/en/document/vi...5/ssp655-wg-en
Would certainly welcome clarification if I am missing something, but it seems to me that there is zero benefit to bypassing the factory system, and no need for an aftermarket oil catch can on this engine. Wouldn't mind seeing more pics of that car though...that is a serious green.

Lollll I figured, thanks for the details.
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Old 08-31-2018, 09:14 AM
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Originally Posted by ArvX147 View Post
Is there any demonstrated reason to have a catch can on this car? what problem are you solving?

On my Mk7 Golf R, the catch can was totally worthless, it just filled up with water mostly. Seems that modern engine designs have made the device pretty pointless but that didn't stop 10 manufacturers from coming out with one for that car....
How long did you run your can for? Also, What time of year? We did some testing on the MK7s a while back, and also found that the factory AOS was pretty effective, but we're rethinking that after seeing the state of the intercooler pipes during our testing on a Golf 7R back in February:





Originally Posted by heymoe View Post
My understanding is that it's a device that tries to separate oil / liquid from the blow by before it gets recirculated back into the intake. The idea being to reduce carbon build up on the intake valves for direct injection engines.
Yup! that's a pretty accurate description! Our catch cans are also specifically designed to capture the blow-by so that it's not drained back into the oil pan, since a lot of times it can also contain fuel droplets and/or other contaminates.

Originally Posted by mplsbrian View Post
Looks like this was crossposted to both the B9 S4 & S5 forums, so I'm copy-pasting my reply to S4 thread here:

Hate to break it to you guys but the B9 S4/S5 already has an oil catch can/fine oil separation+recovery mechanism right from the factory. See pages 20/21 of this doument: https://www.yumpu.com/en/document/vi...5/ssp655-wg-en
Would certainly welcome clarification if I am missing something, but it seems to me that there is zero benefit to bypassing the factory system, and no need for an aftermarket oil catch can on this engine. Wouldn't mind seeing more pics of that car though...that is a serious green.
To paraphrase what I responded with of on that thread, yup we already knew going into this project that VAG incorporates an AOS into their PCV system. We saw this with our initial MK7 testing, and also when we designed our kit for the BMW N55 engines. Just from the photo above from our MK7 Golf R and also the residue we saw on our donor car's PCV line, we're confident that we'll be able to catch some blow-by once we run our 1000 mile test.




More to come soon!

-Nick
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Old 08-31-2018, 09:41 AM
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Presence of oil does not confirm rate of accumulation or demonstrate a need for a catch can, as I said, catch can always filled with water and very little oil.

If a very small amount of oil blowing by was a problem they would have just made the stock system better, but I am certain its not a problem.

But by all means keep trying to sell product that people don't need to the others who will gladly buy this because they believe the marketing. Just voicing my opinion.
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