intake idea...crazy idea (or is it?)
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Posting Guru
Joined: Oct 2003
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From: Quesnel, BC, Canada
intake idea...crazy idea (or is it?)
so I was lookin at the intake manifold on my 96 PSD the other day and I noticed that there were no individual runners for each port. The left and right banks look like they share a common plenum per side. Anyone that knows anything about engines, knows that port size and runner length are key to maximizing performance at desired engine speeds....longer runners are more efficient at lower rpm, shorter runners are more efficient at higher rpm.
So my questions are:
1) Do the N/A Diesels (pre PSD) have intake manifolds common to gas engines (ie: individual port runners)?
2) Would the early n/a 7.3L intake fit onto the PSD powerstroke?
3) IF yes and yes, would it flow well enough under boost?
my reason for asking is, it would improve power in lower rpm thus getting engine speeds into boost range quicker...which boils down to awsome driveablilty and performance.
So my questions are:
1) Do the N/A Diesels (pre PSD) have intake manifolds common to gas engines (ie: individual port runners)?
2) Would the early n/a 7.3L intake fit onto the PSD powerstroke?
3) IF yes and yes, would it flow well enough under boost?
my reason for asking is, it would improve power in lower rpm thus getting engine speeds into boost range quicker...which boils down to awsome driveablilty and performance.
Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
would not help at all. diesel are throttled by the fuel at the injectors not by intake air. so the gasoline theory are out the window for all diesel engines. good thinking though. for more hp in a diesel you need more fuel then enough air not air then fuel. though better breathing still helps for our engines ie better intakes (filter) and better flowing exhaust
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Posting Guru
Joined: Oct 2003
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From: Quesnel, BC, Canada
why turbo a diesel engine then....if that were the case. You can acheive boost on a naturally aspirated engine by matching port size and runner length....its called ram tuning. Air and fuel have a mass, when a mass gets moving it creates momentum and momentum can carry the mass. Create enough momentum and you will have each intake pulse building up upon one another, creating a positive charge (boost) at the intake valve....I wont touch on that any more. I watched on Extreme 4x4 Gail Banks was designing a twin turbo duramax for their project "suburban gorilla", the intake being fabricated had a plenum which led to individual port runners. Its just all about flow, improving flow in and out..like you said...increases performance. When you make it easier for the a/f mix to get to the cylinder via direct passage (aka individual runners) you increase flow. Like I stated earlier, I was intrigued by the idea more for rpm ranges under 1500 rpm (which is where my truck starts to pull). Im still interested in wether or not the N/A 7.3L intake will fit on the PSD model 7.3L.
Postmaster
Joined: Aug 2004
Posts: 3,948
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From: SHELTON, WA
well i am not sure exactly what you are after?
but intake plenums from a superduty will fit on our trucks. plenty of folks who are putting down 450+ rwhp use these.
the only other crazy setup i know of for a psd is this good luck $$$$
but intake plenums from a superduty will fit on our trucks. plenty of folks who are putting down 450+ rwhp use these.
the only other crazy setup i know of for a psd is this good luck $$$$
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Posting Guru
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From: Quesnel, BC, Canada
i havent been working for a few months so im gettin cabin fever. lol. It was just a thought that crossed my mind, improving fuel delivery....giving it a less turbulent passage, I believe would create better throttle response. I know I have to wait for my truck to build boost before it really starts pullin hard.
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Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
throttle response is based on fuel delivery the fuel isn't introduced into the cyclinder with the air charge. you can reduce turbo lag. which i think is what you are really after. you just need different exhuast housing. not a turbo expert so i am not sure this is right but i think a .84 a/r housing will reduce lag. for improved fuel delivery shim you fuel pressure regulator to about 75 psi. and get a chip. or if you want to go bigger get stage 1 or 2 injectors with a custome chip bu then expect to buy a trans very soon. but i think that is not where you are heading anyway since you said your not looking for big hp jst better throttle response.
maybe other have a few suggestions for helping the throttle response too.
maybe other have a few suggestions for helping the throttle response too.
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Thread Starter
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Posting Guru
Joined: Oct 2003
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From: Quesnel, BC, Canada
the air inducted on the intake srtoke is the foundation for the gases that drive the turbo. When the turbo is boosting there is no problem in that sense, as air is being forced into the cylinder. However before you build boost you need to expell however many cfm it takes to drive the exhaust turbine, and to expell that many cfm you need to induct roughly the same amount of atmosphere. Get it in the cylinders easier, in turn drives the turbo to boost easier/sooner, in turn again creating sharp throttle response. Add the smaller exhuast housing on the turbo and I think one would have a very responsive engine, especially in higher gears where you stay in the rpm for longer durations. It doesnt sound unreasonable to me.
Postmaster
Joined: Dec 2003
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From: STEPHENVILLE,TX!!!!!
you turbo will self destruct before the motor does.....
if your pounding that turbo into the 30's alot it aint gonna last long and the stock headgaskets and head bolts will take about 40 psi.
with the stock injectors your gonna have a hard time pushing it into the 30's even with the hottest programming. that is given you have a federal truck if you by chance have a california truck with the split shots you can get it into the 30's easy.
the amount of air the smaller housings can allow into the motor at higher rpms really flattens out. the boost sweet spot will move down the rpm range the smaller the housing. and you will get less and less air at the top end with the smaller housings.
egts will be a concern with the .84 less with the 1.0 but still need to be monitored if your chipped.
if your pounding that turbo into the 30's alot it aint gonna last long and the stock headgaskets and head bolts will take about 40 psi.
with the stock injectors your gonna have a hard time pushing it into the 30's even with the hottest programming. that is given you have a federal truck if you by chance have a california truck with the split shots you can get it into the 30's easy.
the amount of air the smaller housings can allow into the motor at higher rpms really flattens out. the boost sweet spot will move down the rpm range the smaller the housing. and you will get less and less air at the top end with the smaller housings.
egts will be a concern with the .84 less with the 1.0 but still need to be monitored if your chipped.
