Am I the first to have driven with a ROOTS SUPERCHARGER installed on a S4?
05-01-2003, 05:35 PM
#31
Three Wheelin'
</font><blockquote><font size="1" face="Verdana,Tahoma,Helvetica">quote:</font><hr /><font size="2" face="Verdana,Tahoma,Helvetica">How and when should I check for detonation? </font><hr /></blockquote><font size="2" face="Verdana,Tahoma,Helvetica">I wonder if there is a way to tap into and monitor the knock sensor? That would be sweet indeed.
Another way would be to monitor the timing and see if it gets retarded during a run; that's assuming that the knock sensor works by retarding the timing when it detects detonation. I do not know regarding a 928.
Another way would be to monitor the timing and see if it gets retarded during a run; that's assuming that the knock sensor works by retarding the timing when it detects detonation. I do not know regarding a 928.
05-01-2003, 08:15 PM
#32
928 Collector
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Sno .... what is the source of a roots blower like this? I'd like to start one too.
Heinrich (projekt 928 at yahoo ... not related to the other guy)
Heinrich (projekt 928 at yahoo ... not related to the other guy)
05-05-2003, 07:29 PM
#35
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Different engines make different sounds, and is one reason why knock sensors should ideally be ones made for the specific engine. In other words, a knock sensor that comes on a four cylinder Honda engine is not the same as one from an eight cylinder Ford engine, and neither one of them is the same as one for an S4 engine. A generic knock sensor and monitor for it may or may not work well with your particular engine.
The other thing is that kock sensor tell you that knock has occurred. They don't tell you when it's going to occur. The sensor gives an indication of what happened so that conditions can be changed to try to help keep it from happening again. The knocking that it detected, and notified you or the engine management system about, is over with and too late to do anything about. How many knocks does it take before serious damage is done? One big one can easily do it. In that situation, the knock sensor would only be telling you that you just blew something up, which would be very obvious anyway in most cases.
Knock sensors can be very useful, but don't think that you don't have anything to worry about just because you have one.
The other thing is that kock sensor tell you that knock has occurred. They don't tell you when it's going to occur. The sensor gives an indication of what happened so that conditions can be changed to try to help keep it from happening again. The knocking that it detected, and notified you or the engine management system about, is over with and too late to do anything about. How many knocks does it take before serious damage is done? One big one can easily do it. In that situation, the knock sensor would only be telling you that you just blew something up, which would be very obvious anyway in most cases.
Knock sensors can be very useful, but don't think that you don't have anything to worry about just because you have one.
05-07-2003, 03:29 AM
#36
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Just killing time on EBAY. Lots of different SC for sale actaully.
Did you have to lengthen the "snout" for the upper pulley to sit over the lower?
The similair M112s i see for sale are shorter i think.
Whats is the make model/application of the one you have?
anyway..heres a few on ebay. The one of the GM 3800 and FORD 3.8 seem pretty popular sale items.
Also see a few MB "kompressors" from the 320 cars. They have an electromagentic clutch. I though that was pretty cool.
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2414090144" target="_blank">http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2414090144 </a>
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6770&item=2413783051" target="_blank">http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6770&item=2413783051</a>
keep us informed.. <img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" /> to your work!
Did you have to lengthen the "snout" for the upper pulley to sit over the lower?
The similair M112s i see for sale are shorter i think.
Whats is the make model/application of the one you have?
anyway..heres a few on ebay. The one of the GM 3800 and FORD 3.8 seem pretty popular sale items.
Also see a few MB "kompressors" from the 320 cars. They have an electromagentic clutch. I though that was pretty cool.
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2414090144" target="_blank">http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33741&item=2414090144 </a>
<a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6770&item=2413783051" target="_blank">http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6770&item=2413783051</a>
keep us informed.. <img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" /> to your work!
05-07-2003, 05:00 AM
#37
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Tony,
I spent a lot of time looking at different blowers OEM and aftermarket. I based my search on avalibility, displacement and length of snout. The Jaguar M/MP112 blower is the best candidate because it has the longest snout and is the largest displacement. The trick is to pull the off-set pulley off and turn it around. This gives the clearence to line the blower's 8 rib pulley (which will work w/ 6 rib belt) up with a 6 rib crank pulley that replaces the PS pulley at the crank. I call it the M/MP112 because it does not have the built in bypass but does have the teflon on the rotors. <a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33741&item=2412026540" target="_blank">ebay jag blower</a> <a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33741&item=2412781900" target="_blank">.......... and another.</a>
The Lightning MP112 is the same size but has 2 flaws, short snout and top inlet. A longer snout can be had for $400 to $600 from Magnuson. A top inlet would be ok with a longer snout though because it places the inlet further back where there is more clearence with the sloped hood.
The mustang MP112 has too short a snout. The side inlet is good though.
Next best to the Jag MP112 is the later model GM Eaton MP90, sometimes referred to as the GM 3800II (the 3800I is a M62). It seems to have a long snout and given Lagavulin's calculations on the "boost post" it should be big enough to make 5psi, 423 HP(and not much more) on the 32 valve. It also has a built in by-pass valve where the Jag M112 does not. Another plus to the GM3800II is the circular inlet, making it easy to plumb to. It's flaws may include too short a snout, and too small inlet diameter. The Floz guy on ebay ports these blowers to a larger inlet diameter though.
The Ford M90 has too short a snout. I have already tried it.
The Mercedes Eaton M45 with electric clutch is too small. You would need two of them.
<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />
Andy K
I spent a lot of time looking at different blowers OEM and aftermarket. I based my search on avalibility, displacement and length of snout. The Jaguar M/MP112 blower is the best candidate because it has the longest snout and is the largest displacement. The trick is to pull the off-set pulley off and turn it around. This gives the clearence to line the blower's 8 rib pulley (which will work w/ 6 rib belt) up with a 6 rib crank pulley that replaces the PS pulley at the crank. I call it the M/MP112 because it does not have the built in bypass but does have the teflon on the rotors. <a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33741&item=2412026540" target="_blank">ebay jag blower</a> <a href="http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&category=33741&item=2412781900" target="_blank">.......... and another.</a>
The Lightning MP112 is the same size but has 2 flaws, short snout and top inlet. A longer snout can be had for $400 to $600 from Magnuson. A top inlet would be ok with a longer snout though because it places the inlet further back where there is more clearence with the sloped hood.
The mustang MP112 has too short a snout. The side inlet is good though.
Next best to the Jag MP112 is the later model GM Eaton MP90, sometimes referred to as the GM 3800II (the 3800I is a M62). It seems to have a long snout and given Lagavulin's calculations on the "boost post" it should be big enough to make 5psi, 423 HP(and not much more) on the 32 valve. It also has a built in by-pass valve where the Jag M112 does not. Another plus to the GM3800II is the circular inlet, making it easy to plumb to. It's flaws may include too short a snout, and too small inlet diameter. The Floz guy on ebay ports these blowers to a larger inlet diameter though.
The Ford M90 has too short a snout. I have already tried it.
The Mercedes Eaton M45 with electric clutch is too small. You would need two of them.
<img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />
Andy K
