[Diy_efi] Question on Knock Sensors

[hugh at sol.co.uk]

Don,

Very interesting information=2E

Do you conclude that detonation is therefore likely to be found at around =
6
kHz?

The knock detection overview on page 2 of the following Teas Instruments
*=2Epdf tells that the range is normally between 5kHz to 7kHz
http://ccrc=2Ewustl=2Eedu/~roger/427M/spra039=2Epdf=20

Bosch also do some frequency filter chips that I have previously been
offered from =A317 to =A3250 for the more sophisticated versions=2E

What are the AASS,HKD,HKR,BLN,ANBZ det module abreviations, are they from
different vehicles?

Thanks

Hugh





Original Message:
-----------------
From:  don=2Ebroadus at exeloncorp=2Ecom
Date: Tue, 22 Feb 2005 09:03:06 -0600
To: diy_efi at diy-efi=2Eorg
Subject: RE: [Diy_efi] Question on Knock Sensors


I have collected 14 different sensors for testing and have only found the =
DR
number or in the case of a Quad 4 10456209 number=2E
The last 4 digits are the date code=2E  Usually the year and day of
manufacture (Julian Calendar)=2E  I have profiled the sensors by getting a=
 1/4
NPT pipe coupling and screwing one sensor in one end and another sensor in=

the other end=2E I set up with 2  DR562      sensors=2E I applied a sine w=
ave
from a HP 3324A to one sensor and looked at the output of the other sensor=

with a Nicolet 440 scope=2E with 1 VPP amplitude I sweep the frequencies f=
rom
1Khz to 50 Khz The highest amplitude was always at 6 Khz=2E Of the 14=20
sensors I tested they all responded the same=2E I concluded that the senso=
rs
are not all that different and could be interchanged=2EI then tested 9
external det modules from AASS,HKD,HKR,BLN,ANBZ ect=2E  The output is 10 v=
olt
until between 4 Khz and 12 Khz the output would go low =2E Again 6 Khz was=
 the
sweet spot=2E    =20

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-----Original Message-----
From: David Dowell [mailto:dowelljd at alltel=2Enet]
Sent: Monday, February 21, 2005 8:22 PM
To: A list for Do-It-Yourself EFI
Subject: [Diy_efi] Question on Knock Sensors


Hi All,
=20
I went to the junk yard to gather parts and pulled several knock sensors o=
ff
of Chevy Suburbans with 350 CID engines=2E
=20
When I got back to the house with them and cleaned them up, none have the =
GM
numbers that are listed as being for 350s=2E  In fact, all the sensors hav=
e a
number that starts with DR-699-#### where the # is a number=2E  In additio=
n,
all of them have different numbers for the last 4 numbers (####)=2E  =20
=20
Can anyone out there tell me what these numbers are for?  Do you have a
cross reference to the GM part #'s=2E
=20
Thanks for the help=2E
=20
Dave



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