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Diesel injection timing sensor

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2007-2009 » Archive through 28 November, 2008 » Diesel injection timing sensor « Previous Next »

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not_a_number
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Username: not_a_number

Post Number: 50
Registered: 08-2005

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Posted on Tuesday, 18 November, 2008 - 09:20 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hello,

A friend who restores old tractors (1940-1950) has a problem which he suspects may be related to a replacement injector pump being mistimed.

I vaguely recall seeing a project (somewhere) that used a piezo transducer to sense the pressure pulse in the injector pipes. Of course, I can't find it now.

Grateful for any help.


Regards,

NaN
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hackinblack
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Username: hackinblack

Post Number: 327
Registered: 09-2006

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Posted on Wednesday, 19 November, 2008 - 05:18 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

a piezo sensor is the usuall modern method of dynamic timing modern diesel engine pumps;
though i dont recall having seen any DIY versions of the professional kit

if you find any let me know!,they would certainly be worth making
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petelobus
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Username: petelobus

Post Number: 223
Registered: 06-2005

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Posted on Saturday, 22 November, 2008 - 12:06 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I've not seen any DIY versions. Think that they are only a peizo device clamped intimately to the injection pipe - measures the expansion of the pipe. A word of warning though - the timing indicated is not necessarily the same as the static timing - there are propagation delays up the pipe, and modern engines have injection timing alterations when running. Do not think that either of these would be of great importance on a 1950 tractor engine!

Ian
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atferrari
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Username: atferrari

Post Number: 638
Registered: 05-2005


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Posted on Tuesday, 25 November, 2008 - 09:11 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

and modern engines have injection timing alterations when running

Those alterations are by design or modern engines suffer them by any reason?
Agustín Tomás - Buenos Aires - Argentina
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petelobus
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Username: petelobus

Post Number: 224
Registered: 06-2005

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Posted on Wednesday, 26 November, 2008 - 07:30 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Modern engines normally advance the injection timing with speed, to make up for the (more or less) fixed ignition delay. Most early engines had the timing fixed (fuel pump camshaft driven directly from the engine). 'Static' timing figures for modern engines (generally) refer to the full retarded position, so some injection advance may have occurred even at idle. Note that none of this applies to really modern engines with common rail injection, but then they have no pulsed high pressure injection pipes, so the timing tool cannot be used.

Guess thats enough diesel injection theory for an electronics website?

Ian

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