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Joined: Dec 2003
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Originally posted by JasonJ:
ever tried spitting a spitball through a paper towel roll? now try a straw.......
Precisely
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Joined: Mar 2003
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Well exhaust gases will stay in the engine a little longer if there is back pressure, thus get reburned, those that were not already, that't my understanding. I believe it was Logan00 or ZetecRacing that explained it to me, and I might be wrong, it was a while ago. Again I never professed to know anything about anything.
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Joined: Sep 2002
Posts: 163
CEG\'er
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CEG\'er
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 Try one of these inline...or get a couple of stainless tip styles. These are created so that you keep back pressure under low driving conditions and will open wide up under higher engine speeds to allow max flow. I say get the tru bendz (w/Borla resinator exhaust) 2.5" with 2-stainless tips. Keep your lows and increase your highs. My .02
Last edited by stepmar2; 03/30/04 03:57 AM.
a D*CK SLAP IN THE FACE IS ALL I GET FOR STICKING MY NECK OUT FOR A FORD... PLEASE DELETE MY ACCOUNT!
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you dont need back pressure. that back pressure is all a myth, you need velocity. without velocity the exhaust slows down and doesnt exit as quick. kinda like the river flow theory. when the river goes from wideto narrow the water speeds up and if it goes from narrow to wide it slows down the flow. the exhaust gas temperature comes into affect also
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Joined: Nov 2003
Posts: 610
Veteran CEG\'er
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Veteran CEG\'er
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Originally posted by IL Sean:
Well exhaust gases will stay in the engine a little longer if there is back pressure, thus get reburned, those that were not already, that't my understanding. I believe it was Logan00 or ZetecRacing that explained it to me, and I might be wrong, it was a while ago. Again I never professed to know anything about anything.
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.
FYI: Its also one of the reasons our intake manifolds get so damn dirty.
2001 BMW 325i Sport, Stickshift 
'96 Mercury Mystique V6 *TOTALLED* 
For sale:
Alpine CDA-9811
Eclipse Amplifier
Pioneer Tweeters
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Joined: Sep 2000
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Originally posted by MercuryMystik99:
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.
FYI: Its also one of the reasons our intake manifolds get so damn dirty.
No it is not.
The reason the manifolds get so dirty is they injest oil from the valve cover vents and PCV system.
Mainly from the vents (at rpm levels above 5k) though as the 2.5L does not drain the heads effectively and raw oil gets sucked into the vents and directly into the intake.
There is no cure for that problem except running a Full 3L engine since it has extra, larger drains to solve that problem and the high rpm oil starvation one as well.
The PCV problem can be curtailed by running a PCV seperator.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Originally posted by MercuryMystik99:
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.
Not quite. We do that for clean air. Tree huggers are happy now.
Must be that jumbly-wumbly thing happening again.
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Joined: May 2000
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Originally posted by DemonSVT:
Originally posted by MercuryMystik99:
Burning unburnt gas in the exhaust is already taken care of. It is called your EGR: Exhaust Gas Recirculation. It recirculates exhaust back into your intake to burn the unburnt gas to save a few miles per gallon. Thats what you were thinking of.
FYI: Its also one of the reasons our intake manifolds get so damn dirty.
No it is not.
The reason the manifolds get so dirty is they injest oil from the valve cover vents and PCV system.
Mainly from the vents (at rpm levels above 5k) though as the 2.5L does not drain the heads effectively and raw oil gets sucked into the vents and directly into the intake.
There is no cure for that problem except running a Full 3L engine since it has extra, larger drains to solve that problem and the high rpm oil starvation one as well.
The PCV problem can be curtailed by running a PCV seperator.
Actually, it can be solved completely by plugging the left head and right head hookup in the goose neck and reroute all 3 lines to the seperator and then run the seperator "out" line into the PCV nipple below the throttle body. Granted, it will have to be drained at least once a month if no sooner, but at least you will know how much oil you are now NOT burning and running through the UIM/LIM assymbly.
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whewre is the pcv inlet on the manifold? i cant seem to find it
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Originally posted by cvkillacontour98:
whewre is the pcv inlet on the manifold? i cant seem to find it
you have to look under the throttle body. You need to remove the intake pipe and filter to poke your head under there to see it. It's just above the IMRC throttle linkage. It links into the bottom of the UIM about the same location as the two vaccum lines do on the top, only on the bottom 
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