egr/temps
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Joined: Mar 2004
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From: kansas city
egr/temps
I have a 75 LTD w/351M. I come to the truck forum because you guys seem to know all about the 351m/400's! My question is this:
Since the egr system was designed to lower the combustion temps to reduce emissions, then disabling it would naturally raise those temps. I have heard/read that this could cause pinging problems, and possibly a need for higher octane gas. What I don't get is what happened on the 60's and early 70's non-egr V8's? Didn't they all run without egr, with higher temps? I know the higher compression motors needed higher octane, but not all motors in the 60's were high comp. Not all engines were clevelands or cyclones, etc. Some ran on regular octane. Did the lead in the gas help? They seemed to survive just fine without egr.
Also, if I do run my '75 w/o egr, say with an intake manifold swap for a 4bbl and no egr, am I risking anything for my motor with the higher temps? Would it overheat more, or ruin seals or gaskets or anything?
Any expert advice is appreciated, Thanks!
Since the egr system was designed to lower the combustion temps to reduce emissions, then disabling it would naturally raise those temps. I have heard/read that this could cause pinging problems, and possibly a need for higher octane gas. What I don't get is what happened on the 60's and early 70's non-egr V8's? Didn't they all run without egr, with higher temps? I know the higher compression motors needed higher octane, but not all motors in the 60's were high comp. Not all engines were clevelands or cyclones, etc. Some ran on regular octane. Did the lead in the gas help? They seemed to survive just fine without egr.
Also, if I do run my '75 w/o egr, say with an intake manifold swap for a 4bbl and no egr, am I risking anything for my motor with the higher temps? Would it overheat more, or ruin seals or gaskets or anything?
Any expert advice is appreciated, Thanks!
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Joined: Mar 2004
Posts: 8
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From: kansas city
Have read a bunch now. It sounds like if I can tackle the ping, I shouldn't have to worry about engine damage from higher temps. Don't have any computers to worry about codes & stuff, but I have read enough to consider keeping egr working anyway.
This is all in prep for the rebuild that is coming, and how I want to do it. Lots of good info found on new cams & carbs, too!
Thanks
This is all in prep for the rebuild that is coming, and how I want to do it. Lots of good info found on new cams & carbs, too!
Thanks
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Joined: Sep 2001
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There is a lot to read here 
We like it when users take the time to do a little homework on their own b4 they ask questions. The questions are always better that way and we don't have to re-hash thru basic material. I guess it is kind of like reading the chapter in the book B4 you went to class... None of us ever did that tho! -hehe! I solved that problem in classes I teach by announcing there will be a quiz at the start of class each day worth enuf points to make it hurt if you didn't read the material before class. I was a nasty SOB teacher... I wanted to discuss the meat of the subject in class rather than read the book to the students.
We like it when users take the time to do a little homework on their own b4 they ask questions. The questions are always better that way and we don't have to re-hash thru basic material. I guess it is kind of like reading the chapter in the book B4 you went to class... None of us ever did that tho! -hehe! I solved that problem in classes I teach by announcing there will be a quiz at the start of class each day worth enuf points to make it hurt if you didn't read the material before class. I was a nasty SOB teacher... I wanted to discuss the meat of the subject in class rather than read the book to the students.
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