[uucdigest] Friday, April 4 2003 Volume 03 : Number 6281
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Send 'em to [EMAIL PROTECTED] |__________________________________________________________________ In this BMW UUC Digest: Re: [uuc] Re: Questions about adjustable shocks Re: [uuc] <OT> Collisions Re: [uuc] E36: questions about aux air pump and adjustable shocks Re: [uuc] Re: Questions about adjustable shocks Re: [uuc] High-pitched metallic whistling sound from rear end Re: [uuc] Re: Questions about adjustable shocks RE: [uuc] Potential Dex-Cool Class-Action Suit Re: [uuc] E36: questions about aux air pump and adjustable shocks RE: [uuc] ABS question [uuc] Catalysts [uuc] cooling system life RE: [uuc] Catalysts ---------------------------------------------------------------------- Date: Thu, 3 Apr 2003 22:21:42 -0500 From: "Gary Derian" <[EMAIL PROTECTED]> Subject: Re: [uuc] Re: Questions about adjustable shocks Yes, rebound damping is the piston of a twin tube shock. Bump damping is in the foot valve. Gary Derian > > BTW, where is the adjuster on those new externally adjustble rear SAs? Top of bottom? > > It's just like the Koni front strut cartridge insert - the adjuster comes up > inside the main shock shaft and ends with a pair of flats on the top end > above the main nut. > > Too bad it's not a simple external knob on the shock body like the Koni SA I > helped a friend install on his Z06. They're even easier to adjust. > > Neil > 96 M3 > ------------------------------ Date: Thu, 3 Apr 2003 22:30:30 -0500 From: "Gary Derian" <[EMAIL PROTECTED]> Subject: Re: [uuc] <OT> Collisions Yea, he corrected me also :-). Good thing car collisions are plastic. Gary Derian > Sean: > > I was waiting for you to chime in with the physics > background. My reference was to the three-body > problem when the collision is simultaneous not having > a solution in classical mechanics. > > I was under the impression that the solution for the > two-body was known, but clearly I was mistaken. I was > under the impression that the three-body was 'solved' > by treating it as a two-body with a slight time > stagger and taking two in turn and iterating. > Similarly for gravitation problems. > > Another long-term misconception cleared up when I read > further on it, I guess. > > Neil Deshpande - loves the amusing/scietific > diversions/found Jay's post exceedingly amusing! > > *** > > Sean Cordone <[EMAIL PROTECTED]> > Hah - I'm stunned this Frinkiac thread still has legs. > In fact there's no unique solution to the general > problem of an elastic collision in two dimensions - > even for two bodies. Conserving energy and momentum > gives you three equations, but there are four > unknowns. > - --SC > ------------------------------ Date: Thu, 3 Apr 2003 22:34:53 -0500 From: "Gary Derian" <[EMAIL PROTECTED]> Subject: Re: [uuc] E36: questions about aux air pump and adjustable shocks Fire needs fuel and air. Remove one and the fire stops. A cold engine runs rich by necessity. An air pump adds extra air to the exhaust to burn up the excess fuel. The heat also serves to light off the catalyst. Excess fuel to the catalyst causes no harm. It does pollute the atmosphere though. As soon as the catalyst and exhaust sensor heats up, the engine control goes close loop stochiometric and the air pump is no longer needed. Leaving the pump inoperative will cause no harm to the catalyst and will not increase emissions once the catalyst warms up. Gary Derian > "Gary Derian" <[EMAIL PROTECTED]> wrote: > > Fake the sensor? The air burns the rich mixture to clean the exhaust > > and heat the catalyst faster. > > I have to claim ignorance of the internal workings of the cat. > I thought dumping unburnt fuel into the cat will burn it off and heat the > cat up faster? > > If not pumping enough oxygen into the cat at start up might lead to its > early demise I might move my noisy cat air pump replacement to the top of > my to-do list. > > alex f ------------------------------ Date: Thu, 3 Apr 2003 22:10:42 -0500 From: "Gary Derian" <[EMAIL PROTECTED]> Subject: Re: [uuc] Re: Questions about adjustable shocks A twin tube shock can be compressed while it is held upside down but it should be turned right side up when it is extended. If you don't do this, the air will have to work out before you get really good damping. Gary Derian > on 4/3/03 4:44 PM, "J. Ochi" <[EMAIL PROTECTED]> wrote: > > > Gee - I just put a 3/8" drive hex key socket on a breaker bar, then put the > > bar on the floor. Stand on the handle, put the shaft on the hex key, > > compress and turn away. Piece of cake. > > But what kind of fun is there in that????? > > Neil > 96 M3 > ------------------------------ Date: Thu, 3 Apr 2003 19:57:55 -0800 From: "Joe Elwell" <[EMAIL PROTECTED]> Subject: Re: [uuc] High-pitched metallic whistling sound from rear end Mama mia, this is too obvious! I'll put a bottle of BeanO in the diff, this is sure to cure it. :-) thanks Jeff!! - ----- Original Message ----- From: "Pharr, Jeff" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, April 03, 2003 11:23 AM Subject: RE: [uuc] High-pitched metallic whistling sound from rear end > > A whistling sound from the rear end can also be caused by bad gas... > > --Jeff > > > P.S.: Is there enough fluid in the diff? Have you tried inviting a > helper > to ride in the trunk to verify the origin of the sound? > > "Joe Elwell" <[EMAIL PROTECTED]> wrote: > > All, > > My 95 M3 is giving off a very high-pitched whistling sound when > moving. > > It does not vary with speed. It does go away when I turn, and > sometimes > for > > a while afterward. > > This is a track car, original diff, 88k miles. I'm guessing limited > slip. > > Comments? > > tia, > > Joe Elwell > > > > ------------------------------ Date: Thu, 3 Apr 2003 20:22:39 -0800 (PST) From: Carlos Lopez <[EMAIL PROTECTED]> Subject: Re: [uuc] Re: Questions about adjustable shocks Alex Fadeev sez: >Make that amateur OB-GYN ;-) Aren't we all? Neil sez: > Exactly. Most people come to think of the normal Koni SA rears as > "pre-settable" rather than "adjustable." Then Alex sez: >Agreed. Same goes for the 'adjustable' camber plates and 'adjustable' >ride height coil over suspension kits. Oh puhleeze! Explain how these are not adjustable. The Konis I can see your point since you have to remove them but camber plates and threaded collars stay in the car when you adjust them. You do need to know how they affect the alignment but that doesn't put them in the set them and forget them camp. You can actually align your car in such a manner that it can have a "track" setting and a "street" setting at least for the front camber plates. Carlos 91 M3 88 iS __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - File online, calculators, forms, and more http://tax.yahoo.com ------------------------------ Date: Thu, 3 Apr 2003 23:27:46 -0500 From: "KMS - Brett Anderson" <[EMAIL PROTECTED]> Subject: RE: [uuc] Potential Dex-Cool Class-Action Suit This exact same thing happened to me when I was a teenager. A friend who worked at a gas station "topped us up" with oil before a trip. About 20 minutes into the trip, the vehicle, a Ford Escort panel van, filled with smoke. As it was a long trip, and we had about 60 gallons of gas in cans in the back, we pulled over and bailed. After 5 minutes, when the vehicle didn't explode, we went back to investigate. It was oil smoke, because every seal in the engine had blown out. Having little choice (2am, middle of nowhere, and totally stupid) we got back in and continued to drive. Vehicle began running strange after about 100 miles. During a driver swap, engine stalled, and never restarted. Seized solid. Ran out of oil....... Oh well..... - ----------------------------------------------------- BMW Special Tool Rentals Pay per incident tech support - ----------------------------------------------------- Brett Anderson KMS (440) 338 1650 www.koalamotorsport.com OSS committee member > -----Original Message----- > [mailto:[EMAIL PROTECTED] Behalf Of steve lyon > Another ignorant owner story... I had a friend in high school who > bought a used Honda Civic. He decided one day to change his own oil, > and was doing fine until he got to the part about filling the engine > with new oil. He *FILLED* the engine. All the way to the top, oil > level right up to the top of the valve cover. > The unbelievable part is the car somehow started and drove for about a > block before it quit. He blew out all the seals and had oil > leaking/sprayed/dripping/puddling everywhere. I asked him how much he > put in - he said something like 9 quarts. ------------------------------ Date: Thu, 03 Apr 2003 23:36:18 -0500 From: Brian Daley <[EMAIL PROTECTED]> Subject: Re: [uuc] E36: questions about aux air pump and adjustable shocks Gary Derian wrote: >Excess fuel to the catalyst causes no harm. It does pollute the atmosphere >though. > That depends on how you're defining "excess". Too much fuel burning in the cats will overheat the catalyst brick and it will crumble. In the context of the current discussion (cold start-up with no air pump) it's only a little rich for a short period of time so this doesn't come into play. Brian Daley ------------------------------ Date: Thu, 3 Apr 2003 23:33:52 -0500 From: "KMS - Brett Anderson" <[EMAIL PROTECTED]> Subject: RE: [uuc] ABS question Yes. Unless the system is programmed for it. eg. 318ti/Z3 with donut spare. - ----------------------------------------------------- BMW Special Tool Rentals Pay per incident tech support - ----------------------------------------------------- Brett Anderson KMS (440) 338 1650 www.koalamotorsport.com OSS committee member > -----Original Message----- > [mailto:[EMAIL PROTECTED] Behalf Of T WALROD If one tire is a different diameter from the other three does > that screw up > the ability of ABS to operate? For instance, if you were running a > tire/wheel combination on one corner that was x% different circumference > from the other three, would you get an ABS fault light, and would the ABS > then default to non-operative status, leaving you with working > brakes but no > ABS? ------------------------------ Date: Thu, 3 Apr 2003 23:54:44 -0500 From: "Gary Derian" <[EMAIL PROTECTED]> Subject: [uuc] Catalysts By excess fuel I mean a rich mixture. Rich means more fuel than a stochiometric mixture which translates into no or nearly no oxygen in the exhaust. No oxygen in the exhaust means the catalyst cannot catalyze anything. It can get some oxygen by reducing NOx to N2 and O2. When the engine goes into power enrichment at full throttle, the fire in the catalyst nearly goes out. It stays plenty hot though because the exhaust is plenty hot and there is lots of it. I know this is contrary to the old mechanics tales we've heard. Gary Derian > Gary Derian wrote: > > >Excess fuel to the catalyst causes no harm. It does pollute the atmosphere > >though. > > > That depends on how you're defining "excess". Too much fuel burning in > the cats will overheat the catalyst brick and it will crumble. In the > context of the current discussion (cold start-up with no air pump) it's > only a little rich for a short period of time so this doesn't come into > play. > > Brian Daley > > ------------------------------ Date: Thu, 3 Apr 2003 21:36:57 -0800 (PST) From: Drew Sheppard <[EMAIL PROTECTED]> Subject: [uuc] cooling system life - --0-374899541-1049434617=:9860 Content-Type: text/plain; charset=us-ascii Regarding this statement: "Domestic thermostats last 20-50K miles. Water pumps 30-60K. Hoses rot and start leaking, etc, etc." As a former GM powertrain engineer I have to say I disagree, both from what I saw/did in development and as a satisfied customer. Is this based on any recent data? - --------------------------------- Do you Yahoo!? Yahoo! Tax Center - File online, calculators, forms, and more - --0-374899541-1049434617=:9860 Content-Type: text/html; charset=us-ascii <P>Regarding this statement: <P>"Domestic thermostats last 20-50K miles. Water pumps 30-60K. Hoses rot <BR>and <BR>start leaking, etc, etc."</P> <P>As a former GM powertrain engineer I have to say I disagree, both from what I saw/did in development and as a satisfied customer. Is this based on any recent data? </P><p><br><hr size=1>Do you Yahoo!?<br> <a href="http://us.rd.yahoo.com/finance/mailsig/*http://tax.yahoo.com";>Yahoo! Tax Center</a> - File online, calculators, forms, and more - --0-374899541-1049434617=:9860-- ------------------------------ Date: Fri, 4 Apr 2003 00:42:14 -0500 From: "KMS - Brett Anderson" <[EMAIL PROTECTED]> Subject: RE: [uuc] Catalysts But...... You dump all that fuel into the exhaust during a rich condition, then the condition leans out. Now there's oxygen in the cat, and a tonne of fuel. Cat proceeds to ignite everything around it. Seen it many times. Now granted, the most common cause for cat ignition is a misfire, not a rich condition. One or more cylinders dumping gas, while the rest are pumping oxygen. That way you get raw gas and oxygen and tremendous heat. All of which equals this...... http://www.koalamotorsport.com/misc/burn.bmp - ----------------------------------------------------- BMW Special Tool Rentals Pay per incident tech support - ----------------------------------------------------- Brett Anderson KMS (440) 338 1650 www.koalamotorsport.com OSS committee member > -----Original Message----- > [mailto:[EMAIL PROTECTED] Behalf Of Gary Derian > By excess fuel I mean a rich mixture. Rich means more fuel than a > stochiometric mixture which translates into no or nearly no oxygen in the > exhaust. No oxygen in the exhaust means the catalyst cannot catalyze > anything. It can get some oxygen by reducing NOx to N2 and O2. > > When the engine goes into power enrichment at full throttle, the > fire in the > catalyst nearly goes out. It stays plenty hot though because the > exhaust is > plenty hot and there is lots of it. > I know this is contrary to the old mechanics tales we've heard. ------------------------------ End of [uucdigest] V3 #6281 *************************** | | In memory of Michel Potheau - friend, enthusiast, founder of the BMW CCA. |________________________________________ | Please visit these UUC-approved BMW parts vendors/service providers: | (listed alphabetically) | | Autoscope-Motorsports - http://www.autoscope-motorsports.com | |==================================================== | | Koala MotorSport . 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