Author |
Message |
Mcdusa1
| Posted on Wednesday, June 25, 2008 - 10:06 am: |
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The crank case vent system in the 2002 S3 is not the best. What is a good solution? |
Buellistic
| Posted on Wednesday, June 25, 2008 - 10:28 am: |
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When the BLAST came out in 2000 "i" put their rocker cover PVC's on ... Also put a PVC valve in my timing plug hole ... |
Ratbuell
| Posted on Wednesday, June 25, 2008 - 12:39 pm: |
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Actually, it's a PCV valve (Positive Crankcase Ventilation), and they also come on the XBs. The XB rocker box upgrade is popular - a search here on badweb should turn up plenty of how-to's. |
Djkaplan
| Posted on Wednesday, June 25, 2008 - 01:21 pm: |
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Not so sure the PCV valve in the timing hole makes a huge difference according to this data... http://www.badweatherbikers.com/buell/messages/384 2/11962.html?1018393759 "Another surprise was just how easy it was to plug the hose with my finger, and how it felt when I did. The pressure was not great." But it couldn't hurt and it looks kinda cool... I may do it myself just for grins. |
Djkaplan
| Posted on Wednesday, June 25, 2008 - 01:26 pm: |
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I did the XB rocker cover conversion, btw. It really cleans up the right side of the bike if you've replaced the breadbox and some have reported much less spooge (I never found that to be the case, but I never had a ton of spooge, either). It was still money well spent and a good upgrade. |
Buellistic
| Posted on Wednesday, June 25, 2008 - 02:26 pm: |
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People miss the point by putting a 460 CI PVC valve in a 74 CI breather system ??? Can a DYNO really duplicate real word riding, ie: work required for the engine to push it's self down the road including wind resistance and air pressure in and around the intake, plus movement through the air helps some what to pull the exhaust out of the exhaust system ... |
Werewulf
| Posted on Wednesday, June 25, 2008 - 03:28 pm: |
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everyone has their opinions and a lot of knowledge on this site... heres my observation on venting... the pcv valve on the timing hole is a popular mod with some harley types... i did the xb valve cover mod and it makes sense... everyone wants to remove spooge.. ok, heres my thoughts..ive always been a mopar man...prior to 1966, mopars used a draft tube from the valve cover, down the back of the motor and hung down with a tab welded on the end... the moving air would create negative pressure on the tab and should suck out the blow-by fumes... then came the pcv valve on the carb, sucking the blow-by out with great force at cruise...everyone thought is was just epa stuff...chrysler said no, that it made the motors run cleaner and last longer.. so it was a popular mod to convert the newer motors to the old draft tube set-up and i was no exception...the car didnt feel any stronger, but i know it wasnt burning the spooge in my carb.. however, when the late model cars started getting miles on them, it was plain to see, that the motors with the pcv valves had much less sludge build up inside than the draft tube cars had, using the same oil.. a lot of bike owners seem to jet their bikes very rich, which might contribute to the spooge. im thinking that my xb rocker boxes need some suction from the intake like my xb has.. im not convinced that reburning the blow-by is as bad as it seems...im running a force intake and would like to route my rocker boxes back into the force.. i just havent figured out how...maybe welding a nipple or the like... ok, the timing hole pcv thing might also work better if it had negative pressure, but in conjunction with the rocker box mod, maybe they would work against each other... im still thinking... |
Buellistic
| Posted on Wednesday, June 25, 2008 - 04:16 pm: |
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My question is, do the MOPAR Racers run the breather/breathers into the intake to pollute the intake charge, bet they do not !!! Running 12.0 to 1 fuel ratio ... Have a 103,471.8 miles as of the last ride and my set up works as the rocker arm and cam gear cavities are very clean(pictures if you want them) ... |
Werewulf
| Posted on Wednesday, June 25, 2008 - 04:57 pm: |
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yep, they do...when you blocked off the pvc port, you had to recalibrate your idle circuit, because the blow-by was part of the mixture.. i used to observe the situation on my first patrol car..a 1966 440 mopar with 172,000 mies on it at trade-in time and probably 100,000 miles of idling in he medians.. it would burn a quart of oil every 500 miles...it wouldnt smoke unless i ran it wide open and would catch almost any car on the road..when the valve cover gaskets were replaced, no sludge in the lifter valleys....the 64 models with the draft-tube looked like mud.. |
Jstfrfun
| Posted on Wednesday, June 25, 2008 - 05:24 pm: |
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Well Wulf you shouln't have any problems with PCVs at all since yer top speed is only 35mph. |
Natexlh1000
| Posted on Wednesday, June 25, 2008 - 10:02 pm: |
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I rerouted mint to a hose to the street. Been like that for many miles with no adverse effects. |
Werewulf
| Posted on Wednesday, June 25, 2008 - 11:21 pm: |
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yep that was pretty hairy, but its not like i take chances like that everyday, or anything! |
Jos51700
| Posted on Thursday, June 26, 2008 - 08:15 am: |
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I must say this: Installing a PCV in the timing plug hole can't be all bad. Think: ALL XB's (Except Scions) have reed valves in the crankcase to to help maintain desired internal air pressure. It's not the same, but it's close. I know adding another PCV on a 200 horsepower Vrod helped add a few more ponies. BTW, the hot trick on Mope racers was to run the PCV to a spot (Exactly which? I dunno) on the headers, where the passing gas volume created a vacuum, thereby taking out the trash with the rest of the trash, and keeping the nasty low-octane oil out of ones intake. I myself have never had blowby issues on mine or my customer's Buells, so stock works fine for me. But I've seen some bikes that were problematic, and even some owners that caused it. |
Djkaplan
| Posted on Thursday, June 26, 2008 - 02:31 pm: |
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"Can a DYNO really duplicate real word" No, but if you got something to prove (or disprove) it means a lot more than the seat of your pants. Of course, your's might be better calibrated than most... |
Mmmi_grad
| Posted on Thursday, June 26, 2008 - 05:12 pm: |
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After about 9000 miles on my 01 x1 I still dont know why people have problems with the breather system. My valves were replaced at 5000 after finding leaking valve cover gasket. |
Buellistic
| Posted on Saturday, June 28, 2008 - 09:10 pm: |
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"i" use a FUEL/AIR Gauge for my real world tuning ... This means O2 sensors fittings in each pipe out of each exhaust port and at the collector ... The Devil is in the details !!! Seat of the pants went out with Bi-Planes ... |
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