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#1. [E36M3] sway bar bushings - from Paul Elliott
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Date: Mon, 10 Jun 2002 18:45:24 -0500 From: "Paul Elliott" <elliott.paul@worldnet.att.net> Subject: [E36M3] sway bar bushings Date: Mon, 10 Jun 2002 19:45:50 -0400 From: "Paul Elliott" <elliott.paul@worldnet.att.net> Subject: sway bar bushings I got a chance to take a look at my front left sway bar rubber bushing yesterday, and it looked a little deformed, squished, and stressed to me. I could see the split in the bushing clearly, but one side was sticking out of the bushing brace further than the other, and sort of twisted. If it were alive, Id say it looked as though it were 'pained'. Would you say this is normal, that it needs replacement, or somewhere in between? Thanks. Paul Elliott --------------------------------------------------------- '99 White M3; < 45K miles; Dinan stage II SC kit with 6" RMS crank pulley: 11 psi; AA Water Injection; Fikse FM-10s; X-Brace; Dinan Koni Suspension; Stygar SS and Clutch Stop; Sound by Polk, Excelon, JLAudio ************************************************************* List Commands UNSUBSCRIBE - (in subject line) unsubscribes you from the mailing list. DIR - sends a listing of files available in the list's GET directory. GET filename1.ext,filename2.ext - sends the requested file(s). To issue a command/request to the server: Send a message with the command you wish executed as the subject of the message to the email address e36m3@bmw-m.net. *************************************************************
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#2. Underdrive pulleys and the butt dyno - from Wayne Miller
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Date: Wed, 12 Jun 2002 10:15:02 -0400 From: "Wayne Miller" <m3@waynemiller.com> Subject: Underdrive pulleys and the butt dyno Now that I have spent more time driving my car with the underdrive pulleys, I am sure that there is a nice improvement in the power. For a short time today, I was convinced that my clutch was slipping because the engine was accelerating so fast but then I realized that I was just going very fast. I am getting the car dynoed tomorrow during lunch so I will have a better idea then about how calibrated my butt is. -Wayne
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#3. Re: [E36M3] Need Help with Cooling Problems (Long) - from Noah Paci
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Date: Wed, 12 Jun 2002 13:13:37 -0400 From: "Noah Paci" <npaci@rr.com> Subject: Re: [E36M3] Need Help with Cooling Problems (Long) Physics. In more detail, heat exchange is a function of temperature difference. If you don't allow the radiator to cool the fluid down(and itself), while the water in the engine is heating up and the thermostat is closed, you have narrowed the delta in temperature between the radiator metal and the water exiting the engine, resulting in less cooling by the same cooling device. I looked around on the internet to find some nice description of this and I all I found was a bunch of crazy University Physics course stuff...but an excerpt from one was pretty clear: "The rate of heat transfer should be proportional to the difference in temperature between the layer of external fluid molecules and the nearby layer of interior molecules with which they collide," -taken from: http://www.geocities.com/chemforum/heat.htm further down, I found that there is even more interesting stuff, that the higher the temperature the fluid, the BETTER it transfers heat. Now that's cool. I mean hot. :) "For nearly all fluids, the thermal conductivity is almost entirely a function of temperature, depending little upon density or pressure, and increasing with increasing temperature" resulting in everything being too hot, which I think Geof has already shown us. Cheers, Noah. p.s. if anyone actually understands fluid dynamics and all those crazy greek symbols, there is something about flowing fluids at http://www.mas.ncl.ac.uk/~sbrooks/book/nish.mit.edu/2006/Textbook/Nodes/ chap13/node10.html which was a bit more than I could understand intuitively this morning. -------------------- 6 -------------------- Date: Tue, 11 Jun 2002 15:11:22 -0700 (PDT) From: Matt Henson <hensonator@yahoo.com> Subject: No Thermostat causes overheating? was ..Re: [E36M3] Need Help with Cooling Problems (Long) I'm not sure that I follow this logic.. If the heat can transfer from the metal of the engine to the coolant then it can transfer from the coolant to the metal radiator. Once the heat is in the metal radiator, it will transfer to the air at the same rate regardless of the speed of the coolant. There is no direct coolant->air transfer of heat. Even if there were, I don't see how the total heat transfer of the system depends on the speed of the water. While it is true that you won't transfer as much heat from the coolant with each pass through the radiator, the coolant gets more chances to cool off. Can anyone explain this? Maybe if the coolant flows faster, turbulence will increase, resulting in some thermal barrier forming between the coolant and engine or radiator? I know that water wetter, for example, works by decreasing the thermal barier formed by the coolant (by reducing surface tension?) Then again, with air flow, the barrier typically degrades as the turbulence increases due to excessive velocity. I'm not arguing that leaving the thermostat out won't cause overheating since I don't know; I'm just curious as to why this happens (if it does). Thanks, Matt Always the engineer, I guess :-). --- "kitwetzler@mindspring.com" <kitwetzler@mindspring.com> wrote: > > > Without a thermostat, coolant always has a wide > open path > > and will always flow through the radiator. > > Actually, this can result in overheating. The > transfer of heat to water is pretty efficient, but > going from water to air is pretty inefficient... air > makes a much better insulator than a heat transfer > agent. Anyway, the thermostat does present a > significant flow restriction, even fully open. I > suspect that Joe is right, a lot of cars are pretty > unhappy if you completely remove the thermostat. > > -kit > __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com
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#4. Re: [E36M3] Need Help with Cooling Problems (Long) - from Matt Henson
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Date: Wed, 12 Jun 2002 10:53:06 -0700 (PDT) From: Matt Henson <hensonator@yahoo.com> Subject: Re: [E36M3] Need Help with Cooling Problems (Long) To me, this explanation supports the idea that removing the thermostat does not increase the engine temperature. The thing to note here is that if the water in the radiator is getting hotter then the heat transfer rate will increase, getting more heat into the radiator. This will result in a greater temperature drop as the fluid passes through the radiator. This all adds up to a negative feedback that tends to keep the system stable and the temperature constant. I'll post to sci.physics and see if I get anywhere.. -Matt --- Noah Paci <npaci@rr.com> wrote: > > Physics. > > In more detail, heat exchange is a function of > temperature difference. > If you don't allow the radiator to cool the fluid > down(and itself), > while the water in the engine is heating up and the > thermostat is > closed, you have narrowed the delta in temperature > between the radiator > metal and the water exiting the engine, resulting in > less cooling by the > same cooling device. I looked around on the > internet to find some nice > description of this and I all I found was a bunch of > crazy University > Physics course stuff...but an excerpt from one was > pretty clear: > > "The rate of heat transfer should be proportional to > the difference in > temperature between the layer of external fluid > molecules and the nearby > layer of interior molecules with which they > collide," > -taken from: > http://www.geocities.com/chemforum/heat.htm > > further down, I found that there is even more > interesting stuff, that > the higher the temperature the fluid, the BETTER it > transfers heat. Now > that's cool. I mean hot. :) > "For nearly all fluids, the thermal conductivity is > almost entirely a > function of temperature, depending little upon > density or pressure, and > increasing with increasing temperature" > > resulting in everything being too hot, which I think > Geof has already > shown us. > > Cheers, > > Noah. > > p.s. if anyone actually understands fluid dynamics > and all those crazy > greek symbols, there is something about flowing > fluids at > http://www.mas.ncl.ac.uk/~sbrooks/book/nish.mit.edu/2006/Textbook/Nodes/ > chap13/node10.html which was a bit more than I could > understand > intuitively this morning. __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com
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#5. Re: [E36M3] Need Help with Cooling Problems (Long) - from Chris Papademetrious
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Date: Wed, 12 Jun 2002 13:59:42 -0400 From: Chris Papademetrious <chrispy@ieee.org> Subject: Re: [E36M3] Need Help with Cooling Problems (Long) As a follow-up to this, I think there might be a good laymen's way to sum all this up. The engine generates a certain amount of heat, which is removed through radiation and through the cooling system. Instead of looking at the system from the heat that goes into the coolant, let's look at it from the standpoint of the radiator, where the heat is removed. If the coolant exiting your radiator is ambient temperature, then all the possible heat energy has been exchanged. If the coolant exiting your radiator is higher than ambient because the rate of flow is too high and the coolant has not had sufficient contact time to come to thermal equilibrium, then the temperature deltas are below their system maximums, and suboptimal cooling results. In other words, I think the temperature of the coolant coming out of the radiator determines where the boundary condition is. It is not the speed of the coolant which removes the heat from the system, but rather the temperature differences - Newton's Law of Cooling and all that. Faster coolant flow in itself is not the cause for less cooling; it simply results in less drastic temperature differences in the system, which is the real source of efficiency loss. Of course I'm just an EE myself, so I could be wrong. :) - Chris (back to my Verilog...)
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#6. E36 parts for sale: IFGs, JC intake, JTD tranny brace - from daniel chin
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Date: Wed, 12 Jun 2002 11:19:35 -0700 From: daniel chin <djchin25@mac.com> Subject: E36 parts for sale: IFGs, JC intake, JTD tranny brace I was holding onto these parts thinking that i'd get another E36M3, but in reality, i just spent several hrs working on my E46M3's brake cooling system (a custom version from James Clay). I was hoping to not get sucked into taking the new car on the track so soon... Hence the following are for sale: a. JT tranny brace w/ 'his' & 'hers' bushings, never installed: $225 ($300 new from BMP) b. JT oil distribution block, never installed: $60 ($90 new from JT-D) c. 4 IFG A5 (17x8) excellent condition; 2 bare, 2 w/ 245/40-17 Michelin MXXs w/ about 75% tread left: $1200 d. Peake reset tool: $20 e. RacingDynamics front strut bar (yeah i know): $40 f. JC intake for '96-99 M3 (used 1 yr): $275 g. Two 10 mm H&R spacers: $35 h. 1 instrument pillar pod (never installed): $20 Prefer SF BayArea for the wheels & strut bar. Wheels include 4 fresh center caps for the IFG's. The wheels are true and no road rash, only minor mounting marks, but one wheel's center threads is damaged so a center cap is hard to install (but these wheels are likely used on the track, right?) dan
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#7. Bilstein Install Instructions - from Mohammed Fares
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Date: Wed, 12 Jun 2002 14:32:16 -0400 From: "Mohammed Fares" <mofares@hotmail.com> Subject: Bilstein Install Instructions Does anyone have instructions or a web link for Bilstein Strut/shock install? Thanks. Mo BMWCCA 87925 _________________________________________________________________ Send and receive Hotmail on your mobile device: http://mobile.msn.com
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#8. Going to Buttonwillow HPDE from SF bay? - from Juan Bruce
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Date: Wed, 12 Jun 2002 12:03:04 -0700 From: "Juan Bruce" <jbrucebmw@hotmail.com> Subject: Going to Buttonwillow HPDE from SF bay? Is anyone from the SF bay area heading down Thursday night for the Buttonwillow HPDE on Friday? If you would like to caravan let me know. Juan Bruce BMW CCA GGC '85 M635CSi '95 M3 _________________________________________________________________ MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx
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#9. Subject: radiators,thermostats, heat flow, et al - from Anthony Le
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Date: Wed, 12 Jun 2002 15:27:28 -0500 From: Anthony Le <anthony.le@wcom.com> Subject: Subject: radiators,thermostats, heat flow, et al Here is the real world result. My thermostat broke and stuck in the always open position so coolant always flow. My car ran COOLER. Even running the car for a while in warm weather will not get the temp guage to the middle position where it normally is. Changed the thermostat (plus water pump) and all is back to normal. The car temp guage now points straight up after a minute of running. I just don't see the logic in how running a car without a thermostat will cause overheat. > -------------------- 4 -------------------- > Date: Tue, 11 Jun 2002 20:47:13 -0700 (PDT) > From: John Pease <john_pease123@yahoo.com> > Subject: radiators,thermostats, heat flow, et al > > I couldn't resist. As a full time electrical engineer,part > time plumber, and tinkerer I will add > to the confusion. The engine makes a certain amount of heat. > It can get rid of that heat by > dissipating it or passing it on to the radiator. The rate at > which the heat can be passed on to > the radiator is proportional to the flow rate and temperature > of the coolant exiting the engine. > The thermostat restricts this flow so that at equilibrium the > engine runs at a warmer temperature > than it would without the restriction. With no restriction > (stuck open thermostat) the radiator > sees the maximum flow and maximum heat transfer. This tends > to warm the radiator up, but radiators > dissipate more heat when they are warmer (check out Newton's > law of cooling). So the engine runs > cooler. > > Think also about the boundary conditions. What happens to an > engine with a blocked thermostat? > What happens when you replace the closed engine, radiator, > thermostat system with a fire hose > pumping 48 F water through the engine coolant inlet? > > Break over > Back to Verilog.............. > > John Pease > > __________________________________________________ > Do You Yahoo!? > Yahoo! - Official partner of 2002 FIFA World Cup > http://fifaworldcup.yahoo.com > >
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#10. Re: [E36M3] Need Help with Cooling Problems (Long) - from Matt Henson
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Date: Wed, 12 Jun 2002 15:06:36 -0700 (PDT) From: Matt Henson <hensonator@yahoo.com> Subject: Re: [E36M3] Need Help with Cooling Problems (Long) I don't think that this explanation properly takes into account the fact that the coolant is in a big loop. At all times there is coolant in the radiator, transferring heat. If the coolant temperature increases, so does the rate of transfer into the radiator, keeping the system stable. I think I've found my answers - it has nothing to do with the flow rate but everything to do with the water pump and ability of the coolant to remove heat from the engine. http://yarchive.net/car/engine_water_restrict.html http://www.inccn.net/techforum.htm (see sections 4 and 5) Also, on many cars (don't know about ours), the thermostat doesn't just open the path to the radiator, it closes a bypass path around the radiator. So, if you remove it then the bypass path will always be open. The coolant won't flow through the radiator at all. -Matt (No more Verilog for me today, it's Beer O'clock) --- Chris Papademetrious <chrispy@ieee.org> wrote: > Date: Wed, 12 Jun 2002 13:59:42 -0400 > From: Chris Papademetrious <chrispy@ieee.org> > Subject: Re: [E36M3] Need Help with Cooling Problems > (Long) > > As a follow-up to this, I think there might be a > good laymen's way to sum > all this up. > > The engine generates a certain amount of heat, which > is removed through > radiation and through the cooling system. Instead > of looking at the system > from the heat that goes into the coolant, let's look > at it from the > standpoint of the radiator, where the heat is > removed. > > If the coolant exiting your radiator is ambient > temperature, then all the > possible heat energy has been exchanged. If the > coolant exiting your > radiator is higher than ambient because the rate of > flow is too high and > the coolant has not had sufficient contact time to > come to thermal > equilibrium, then the temperature deltas are below > their system maximums, > and suboptimal cooling results. In other words, I > think the temperature of > the coolant coming out of the radiator determines > where the boundary > condition is. > > It is not the speed of the coolant which removes the > heat from the system, > but rather the temperature differences - Newton's > Law of Cooling and all > that. Faster coolant flow in itself is not the > cause for less cooling; it > simply results in less drastic temperature > differences in the system, which > is the real source of efficiency loss. > > Of course I'm just an EE myself, so I could be > wrong. :) > > - Chris (back to my Verilog...) __________________________________________________ Do You Yahoo!? Yahoo! - Official partner of 2002 FIFA World Cup http://fifaworldcup.yahoo.com