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OM617.952 Max Exhaust Pressure
Does anyone know the maximum safe exhaust pressure you can run with a OM617?
(Unrelated) I've read that the intake side is really only good for ~2bar.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment Last edited by whunter; 02-09-2012 at 07:35 PM. Reason: correction |
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Quote:
I thought the Intake Manifold Pressure from the Turbo could go as high as 12psi. I am not sure what the Exhaust Pressure would be between the Turbo and the Exhaust Manifold or what the Back Pressure if any would be in the Exhaust Pipes/Muffler. This sounds like info that might be on the superturbodiesel site.
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84 300D, 82 Volvo 244Gl Diesel |
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FYI
Quote:
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
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To clarify: I'm installing a Holset HE351V, and plan on experimenting with modified injectors / methanol injection / more fuel one way or another
A refreshed head will be used, my bores are at ~ 0.0015" wear. This engine will be run outside of the recommended operating parameters
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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I think we are wondering what you mean about exhaust pressure? I assume you are referring to boost pressure, that would be intake pressure after the turbo.
as far as maximum boost, as said factory is 12 psi. No idea of what the limit will be. I would say a few more should be no problem. Hopefully some others will say how much boost they have gone up to. I am at 12 psi on a 616, and may end up around 15psi once I up the fuel some more. At some point lifting the head will become a problem, and you will need to o-ring the block and use studs to hold the head down.
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1977 240D turbo |
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I'm speaking to the exhaust pressure, between the exhaust vales and the turbo. I don't want to float a valve if I run too high on the exhaust side.
From what I have read, it's "safe" to run up to 28psi of boost with adequate fueling before I start to bend rods
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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OM616 might have an answer to this, I know he does have a pressure gauge for emp. Exhaust manifold pressure.
Just offhand I would think you could take the area of the valve, and spring pressure to calculate what it would take to lift it. However not so sure this would be reliable to compare to what is happening when the engine is running. How much boost are thinking of running? as this must corilate to emp. It is a bit out of my area of expertise, so really just thinking out loud. I know the cummins crowd are pushing 50 -60 psi boost for pulling trucks, might be worth seeing if they have valve float issues.
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1977 240D turbo |
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I won't be going over 28psi on the intake, but since I'm running a VGT the exhaust can become very restricted. While the head is off I think I'll pressurize the exhaust manifold until the valves start to open, that will give me a rough idea of my "absolute limit"
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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Turbine inlet pressure is what it's called.
I'm not sure how TIP is going to bend your rods. The compressive load on the rod during the combustion stroke will dwarf the same load on the exhaust stroke. And since there are a lot of variables that can affect TIP beyond just engine power output, I don't think it's a good thing to monitor if you're concerned about your rods. I've measured TIP to gauge the effectiveness of hot side turbo mods and to gauge the efficiency of the turbo at varying boost levels. |
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I'm worried about floating a valve with high exhaust pressures, the bending rods comment was kinda unrelated.
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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You test of static float seems like a good idea. This seems unrelated to the kinetic float you usually hear about. It will be hard to measure turbo inlet pressure directly, but maybe the manufacturer has mapped that to boost side pressure and flow.
Because you're dealing with an exhaust system and pulsating flow within each runner, I expect you may deal with resonant effects as you go through the RPM range. Your max pressure would be when you have nodes at the exhaust valve and the exhaust manifold plenum. I think.
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I will definitely be monitoring the exhaust manifold pressure once it's all together, I did with my 2056V setup, I want to say 40-ish-psi was the most I ever saw
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$60 OM617 Blank Exhaust Flanges $110 OM606 Blank Exhaust Flanges No merc at the moment |
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