probably about 30% of the flow is egr. not exactly small amount.
catch can only stops oil getting down the intake. it helps but doesn't stop the soot clogging the intake, most of which comes from the egr.
a clean air filter helps a huge amount.
EGR mod?
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probably about 30% of the flow is egr. not exactly small amount.
catch can only stops oil getting down the intake. it helps but doesn't stop the soot clogging the intake, most of which comes from the egr.
a clean air filter helps a huge amount.
joshman
Member
Doesn't the egr change according to the load required of the engine? So at low revs there's a lot of EGR, then as you rev up and spool up, the egr gets less and less?
Strictly speaking there are TWO doses of EGR fed into our engines.
The first and most obvious is through that gold-coloured pipe that runs from the exhaust manifold on the left side of the motor around the front to the EGR valve on the intake manifold on the right-hand side.
The second and not-quite-as-obvious EGR intake is from the PCV. We all fit catch cans to grab the oil and then feed the output back into the intake so the exhaust gas (which is what blow-by is) goes into our engines.
It would be nice to find another outlet for that, for instance a high-temp-tolerant one-way valve like a reed valve out of a 2-stroke motorcycle engine, then connect that into the dump pipe where it belongs.
The first and most obvious is through that gold-coloured pipe that runs from the exhaust manifold on the left side of the motor around the front to the EGR valve on the intake manifold on the right-hand side.
The second and not-quite-as-obvious EGR intake is from the PCV. We all fit catch cans to grab the oil and then feed the output back into the intake so the exhaust gas (which is what blow-by is) goes into our engines.
It would be nice to find another outlet for that, for instance a high-temp-tolerant one-way valve like a reed valve out of a 2-stroke motorcycle engine, then connect that into the dump pipe where it belongs.
i think its max egr at cruise and tails off at high load/throttle.
quite correct, crankcase vent is another dose of egr, especially if you have blocked air filter.
theres also internal egr which is the exhaust gas left in the cylinder after exhaust stroke is complete.
you can get exhaust PCV vents, but i think the pulses after the turbo is to small. i've only really seen them on atmo petrols with big open exhausts.
quite correct, crankcase vent is another dose of egr, especially if you have blocked air filter.
theres also internal egr which is the exhaust gas left in the cylinder after exhaust stroke is complete.
you can get exhaust PCV vents, but i think the pulses after the turbo is to small. i've only really seen them on atmo petrols with big open exhausts.
user 10312
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TONY'S D40 st
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I did the EGR mod on my Brand new Navara D40 which has around 1,500klms on it now and I didn't notice any improvement with it whatsoever. The only reason I was happy doing it was to stop all of that thick black soot that was going into the intake manifold. At only 1,500klms, I couldn't believe my eyes when I took the EGR pipe off and saw how much of that thick black soot was already in there. I thinks it's definately worth doing just for that reason
If you were to block the left side (drivers and easiest location)
Is there a possibility of a build up in the tube on the other side that dumps soot straight onto the turbo once its full ??
(A question put to me by a mate, I don't know enough about It to comment on the subject)
Sorry about the vagueness it's been a long day
Thanks guys
Is there a possibility of a build up in the tube on the other side that dumps soot straight onto the turbo once its full ??
(A question put to me by a mate, I don't know enough about It to comment on the subject)
Sorry about the vagueness it's been a long day
Thanks guys
180degrees
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I blocked it both sides when I owned a 2.5 nav to avoid that.
Mike the short answer is "yes".
It won't happen fast, because there's no flow through the tube, but particles will start to accumulate. Whether chunks of them will fall out and impede the turbo I couldn't say - it goes in as a powder but there may be some oily deposits to solidify the deposits particularly in D40 autos like mine (DPF regen cycle pumps raw diesel into the exhaust). I guess I have something to worry about!
It might be worth our while if I dismantle the EGR tube, check my blocking plate and see what's in behind it. Won't have a chance to do it for a little while, but I'll try to get it done before the end of the weekend.
It won't happen fast, because there's no flow through the tube, but particles will start to accumulate. Whether chunks of them will fall out and impede the turbo I couldn't say - it goes in as a powder but there may be some oily deposits to solidify the deposits particularly in D40 autos like mine (DPF regen cycle pumps raw diesel into the exhaust). I guess I have something to worry about!
It might be worth our while if I dismantle the EGR tube, check my blocking plate and see what's in behind it. Won't have a chance to do it for a little while, but I'll try to get it done before the end of the weekend.
the sad moment when your makes hound like pestering on a hunch pays off -sigh-
hahah well thats good to know,
We looked at the other end its not easy to get to so i left it for another day when i have more time to block both.
the solution he gave me was every service take the plate off and go for a burn get the system hot and let it flow through - OR block both
hahah well thats good to know,
We looked at the other end its not easy to get to so i left it for another day when i have more time to block both.
the solution he gave me was every service take the plate off and go for a burn get the system hot and let it flow through - OR block both
