Re: A bunch 'o Questions...

["Ewan Hopkins" <ewanhopkins@hotmail.com>]

A knock sensor is effectively a piezo-electric microphone - it contains 
crystals which, when they vibrate, generate a voltage.  The construction of 
the sensor is tuned to make it particularly sensitive to certain 
frequencies, i.e. those generated by pre-ignition, and the location of the 
sensor on the block is also carefully selected to enhance its ability to 
pick-up these frequencies, as is the torque setting of the bolt attaching 
the sensor.  You also need some sort of signal conditioning filter attached 
to the sensor output to normalise the data, i.e. turn the noisy uneven raw 
output from the sensor into a stream of regular blips or whatever that can 
be understood by the ECU/knock box/whatever.

HTH,

Ewan Hopkins...

'85 Storm 2.0
'86 GT 1.8
'87 GT 1.6



>From: "Langford, Cory" <Cory.Langford@icbc.com>
>To: "'scirocco-l@scirocco.org'" <scirocco-l@scirocco.org>
>Subject: A bunch 'o Questions...
>Date: Tue, 28 Aug 2001 08:15:24 -0700
>
>Okay, here is a whole bunch of stuff, anyone got any info please let me
>know:
>
>
>1.  Is there any way to differentiate a G60 1.8 from a regular 1.8 short
>block? (yes when the g-ladder, etc have all been stripped off)
>
>
>2.  Does anyone have, or know of a source for a complete G60 ignition 
>wiring
>set and fuel rail, etc.  I need the engine management system complete
>(wiring, fuel, etc)
>
>
>3.  Anyone know how a knock sensor works (technically)?  Does is act at a
>certain vibration level and send out a signal, close a switch or something?
>Any info to sites with technical details would be nice.
>
>
>
>4.  How much better (in reality) is the infamous Audi 5000 Turbo intake
>manifold over a standard VW one (yes I know a runner needs to be cut off 
>and
>at tb mount welded back on).  - Should you port match the head for a Audi
>intake, or are the runners close to the same size?
>
>
>5.  Can the Distributor from a older 1.6/1.7 fit into a 1.8 block, or do 
>you
>need to modify anything?
>
>
>
>For the turbo Guru's:
>
>A.  How much extra heat does the turbo transfer into the oil?  Should I
>install an oil cooler on the turbo engine to be safe?
>
>
>
>B.   I have seen some turbos with water cooling jackets as well as the oil
>lines.  Are these that much better?
>
>
>C.  How do you size an intercooler?  Is simply bigger better?
>
>
>D.  Anyone have any suggestions on good reading material?
>
>Cory - The VW Addict.
>86 8v (Soon to be 2.1L turbo)
>82 8v (Very rough daily driver)
>86 golf, 85 jetta, 75 Super Beetle, 65 Karmann Ghia
>
>
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