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7.3 idi knock
Does your air cleaner still have the dome shaped resonator under the lid? I think you’re hearing the intake reversion pulsation noise. The air cleaner incorporated a helmholtz resonator device under the lid to kill that intake noise. It was common for consumers to remove the resonator under...- Finn
- Post #13
- Forum: 6.9L IH & 7.3L IDI Diesels
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7.3 turbo engine debate
Figure up to twenty five dynamometers running 24/7 over a thirty five year time period, and it’s probably an underestimation. I generally avoid participation in general interest forums like this because there’s so much barroom type information or opinion flying around, mostly generated by...- Finn
- Post #19
- Forum: 6.9L IH & 7.3L IDI Diesels
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7.3 turbo engine debate
I guess an accumulated total of over 12 million hours of dynamometer Engine Development time under my watch doesn’t count fo much. Plus supplier work and field test. What’s your credentials? How many hours have you spent with FelPro or Dana Victor in your office developing head gaskets? Or...- Finn
- Post #15
- Forum: 6.9L IH & 7.3L IDI Diesels
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7.3 turbo engine debate
I think you read it correc. Not sure what part you don’t understand.- Finn
- Post #8
- Forum: 6.9L IH & 7.3L IDI Diesels
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Engine acts like it hits boost, without a turbo
Check the oil level. If the injection pump shaft seal failed and filled up the oil pan with fuel, at some point crankshaft windage will cause liquid to be carried into the intake manifold. This usually happens at about 2300 rpm, depending on how high the oil level in the pan gets...- Finn
- Post #6
- Forum: 6.9L IH & 7.3L IDI Diesels
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7.3 turbo engine debate
Head studs are something of an Internet, and previously magazine fairy tale. They really don’t do anything other than lighten your wallet and make servicing the engine more difficult. This comes from someone that was involved in head gasket qualification for thirty five years.- Finn
- Post #6
- Forum: 6.9L IH & 7.3L IDI Diesels
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Fuel is accumulating on the Valley Pan
A weep hole was added to the injection pup towards the end of the IDI engine production run. The purpose of the weep hole was to prevent the crankcase from filling up with diesel fuel in the event the pump shaft seal fails. With the weep hole, the leaked fuel runs into the valley pan. Not...- Finn
- Post #11
- Forum: 6.9L IH & 7.3L IDI Diesels
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Source for new 7.3 IDI engine?
White smoke is likely caused by low compression, not faulty valve guides. There’s a procedure out there to measure crankcase pressure using an orifice in place of the cdr. Try that before you pull the heads.- Finn
- Post #5
- Forum: 6.9L IH & 7.3L IDI Diesels
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IDI block = IDIT block
One of the significant upgrades made to the 7.3 IDI engine when the turbo version was introduced was the relocated cross drilled cooling passage in the cylinder valve bridge area. The passage was relocated slightly to reduce cracking in the bridge area. The modification significantly reduced...- Finn
- Post #10
- Forum: 6.9L IH & 7.3L IDI Diesels
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Reviving a 1990 F250
It’s been a long time, but if I remember correctly, the timing is fuel pressure / speed dependent. The pump design is such that the optimum starting calibration was developed with no pedal input. There is very little fuel pressure developed until the rpm builds after the engine fires. No...- Finn
- Post #20
- Forum: 6.9L IH & 7.3L IDI Diesels
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Strange issues, tried basically everything
Running 20 psi boost on an engine with 21.1:1 compression ratio will eventually pound out the ring groves and break the compression rings, if it doesn’t crack the piston through the pin boss or bust the crankcase through the main Journal webs first. Have fun, but keep your pocketbook handy.- Finn
- Post #20
- Forum: 6.9L IH & 7.3L IDI Diesels
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Project: The New CDD Shop Truck
Don’t screw around trying to backyard engineer the head gaskets to “improve” coolant flow. Hundreds of hours of engineering time went into designing and developing the cooling passage size and restrictions to balance the flow path and distribution to optimize the temperature distribution of the...- Finn
- Post #357
- Forum: 6.9L IH & 7.3L IDI Diesels
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Reviving a 1990 F250
No need to depress the throttle pedal during cranking. The governor on the Stanadyne pump is designed such that the pump moves to the full fuel position while cranking regardless of what your foot on the gas pedal is doing. Think of it this way: as soon as the pump starts turning, the...- Finn
- Post #18
- Forum: 6.9L IH & 7.3L IDI Diesels
