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Post by fuzzyruttin on Mar 8, 2018 7:26:08 GMT -5
think the pair has any effect on backpreasure or scavenging effect? (Is it taboo to revive old threads?) Anyway I was wondering about scavenging effects as well... from what I have read, probably negligible, or none. Buying a GY6 as an aftermarket bolt-on, there is obviously no associated tubing - I was simply curious what that open ventilation tube was on the bottom of the valve cover, and landed myself here. If the PAIR valve is pumping air out of the engine that should otherwise be going toward compression, seems there would be some effect, however minuscule it may be. Nonetheless, seeing that there's snow on the ground for the foreseeable future, this has valuable entertainment potential. 1) Disassemble and remove horseshoe pipe, reed valve guts... quick, easy 2) Determine what to do for a block-off plate... garage scavenge hunt since I don't have a welder 3) Now the pesky reed valve housing... hmm, looks like something a few dremel tools could make quick work of. Has anyone ever cut & smoothed this off? Thinking I may use some BBQ Black paint on it afterwards.
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Post by GrumpyUnk on Mar 8, 2018 10:24:42 GMT -5
I think emissions for motor vehicles are measured in 'grams per mile' of HC, NOx, and CO. Given that these small engines produce such a limited volume of exhaust gas(50cc max per cycle .. 2T twice as many, and dirtier) for each mile traveled, it may be below the 'limit' out of the box, with nothing added. PAIR likely dilutes the exhaust gas, and provides some 'excess' O2's just in case there are any unburned HC's still available, or making the O2's available to hook up with the CO(carbon monoxide) to make CO2. Are the differences significant? Dunno. I have multiple machines, and each has its own little 'details' of their emission control systems. I have yet to figure out if any do enough to keep, or are problematic enough to remove, so have just left them as-is. I will likely end up removing the PAIR if only to clean up 'under the hood'. tom
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Post by Happypancake! on Mar 8, 2018 12:08:22 GMT -5
It’s also hard to tune using an A/F meter as the excess O2 will make reading inaccurate.
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Post by jeff84 on Mar 9, 2018 20:22:44 GMT -5
think the pair has any effect on backpreasure or scavenging effect? (Is it taboo to revive old threads?) no, unless its totally irrelevant. 2) Determine what to do for a block-off plate... garage scavenge hunt since I don't have a welder I found a grade 8 bolt that fit snug in the hole. I just cranked it in and made new threads with the bolt. the perfect block off for the pair system. and I could still add it back if I ever wanted to.
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Post by Happypancake! on Mar 9, 2018 21:50:37 GMT -5
On a Honda GET motor, the pair is typically closed anyway. Who runs below 6700 rpm? ?
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Post by fuzzyruttin on Mar 9, 2018 22:33:08 GMT -5
Forgot to take a before pic. This is after I dremeled off the PAIR bracket on the GY6 valve cover. Little more sanding and touching up afterward before I hit it with bbq black paint. Maybe I'll post a pic of the installed cover when it's done. It turned out nice.
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Post by Happypancake! on Mar 9, 2018 22:35:16 GMT -5
You are removing it then...
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Post by fuzzyruttin on Mar 9, 2018 22:38:34 GMT -5
Yes the stock GY6 comes with it. Completely useless for a Ruckus bolt-on application.
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Post by Happypancake! on Mar 9, 2018 22:48:53 GMT -5
Check !
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Post by fuzzyruttin on Mar 10, 2018 8:39:26 GMT -5
No more pair, now just a stealthy valve cover
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Post by zummerp on Mar 11, 2018 17:18:40 GMT -5
No more pair, now just a stealthy valve cover Looks awesome!
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Post by GrumpyUnk on Mar 12, 2018 12:12:35 GMT -5
Very professional looking... and no more white spots on the cam cover... tom
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