The differences between Preignition, and Detonation
Joined: Aug 2003
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Re: The differences between Preignition, and Detonation (Quick 200k Mile Motor)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quick 200k Mile Motor »</TD></TR><TR><TD CLASS="quote"><BLOCKQUOTE>quote:<HR>Ar ticle written by a GM engineer:
http://www.streetrodstuff.com/Articl...e_Basics_I.php<HR></BLOCKQUOTE>
There can be some confusion in the statement: Location of Peak Pressure (LPP) is always 14 ATDC for any engine. It is not! Take a look at this graph...
Taken from a Mercedes. Same motor; 5 different combustion events. Notice that LPP can be well past 20 ATDC ..and if its past 14 ATDC, there is less Peak Pressure.
The author in that streetrodstuff article needs to revise. LPP @ 14 ATDC is the target (our goal), and it does not occur @ 14 ATDC for every motor.</TD></TR></TABLE>
The last thing he said, at the end of page 8 goes as follows:
Hopefully this discussion will serve as a thought starter. I welcome any communication on this subject. Every application is unique so beware of blanket statements as many variables affect these processes.
bump for this wonderful threade that helped me udnerstand how to tune my own car.
http://www.streetrodstuff.com/Articl...e_Basics_I.php<HR></BLOCKQUOTE>
There can be some confusion in the statement: Location of Peak Pressure (LPP) is always 14 ATDC for any engine. It is not! Take a look at this graph...
Taken from a Mercedes. Same motor; 5 different combustion events. Notice that LPP can be well past 20 ATDC ..and if its past 14 ATDC, there is less Peak Pressure.
The author in that streetrodstuff article needs to revise. LPP @ 14 ATDC is the target (our goal), and it does not occur @ 14 ATDC for every motor.</TD></TR></TABLE>
The last thing he said, at the end of page 8 goes as follows:
Hopefully this discussion will serve as a thought starter. I welcome any communication on this subject. Every application is unique so beware of blanket statements as many variables affect these processes.
bump for this wonderful threade that helped me udnerstand how to tune my own car.
Joined: Aug 2003
Posts: 1,205
Likes: 0
Re: The differences between Preignition, and Detonation (Quick 200k Mile Motor)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quick 200k Mile Motor »</TD></TR><TR><TD CLASS="quote"><BLOCKQUOTE>quote:<HR>Ar ticle written by a GM engineer:
http://www.streetrodstuff.com/Articl...e_Basics_I.php<HR></BLOCKQUOTE>
There can be some confusion in the statement: Location of Peak Pressure (LPP) is always 14 ATDC for any engine. It is not! Take a look at this graph...
Taken from a Mercedes. Same motor; 5 different combustion events. Notice that LPP can be well past 20 ATDC ..and if its past 14 ATDC, there is less Peak Pressure.
The author in that streetrodstuff article needs to revise. LPP @ 14 ATDC is the target (our goal), and it does not occur @ 14 ATDC for every motor.</TD></TR></TABLE>
The last thing he said, at the end of page 8 goes as follows:
Hopefully this discussion will serve as a thought starter. I welcome any communication on this subject. Every application is unique so beware of blanket statements as many variables affect these processes.
bump for this wonderful threade that helped me udnerstand how to tune my own car.
http://www.streetrodstuff.com/Articl...e_Basics_I.php<HR></BLOCKQUOTE>
There can be some confusion in the statement: Location of Peak Pressure (LPP) is always 14 ATDC for any engine. It is not! Take a look at this graph...
Taken from a Mercedes. Same motor; 5 different combustion events. Notice that LPP can be well past 20 ATDC ..and if its past 14 ATDC, there is less Peak Pressure.
The author in that streetrodstuff article needs to revise. LPP @ 14 ATDC is the target (our goal), and it does not occur @ 14 ATDC for every motor.</TD></TR></TABLE>
The last thing he said, at the end of page 8 goes as follows:
Hopefully this discussion will serve as a thought starter. I welcome any communication on this subject. Every application is unique so beware of blanket statements as many variables affect these processes.
bump for this wonderful threade that helped me udnerstand how to tune my own car.
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vincent97gsr
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Dec 13, 2001 12:43 AM
