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Oil Management and Engine Durability

28:13
39:02
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At 28:13 in

Ford NASCAR Engines Evolution Explained! 30 Years of Roush Yates Horsepower (C3 D3 FR9)

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What happens here

Early engines like the C3 required large amounts of oil (4-7 gallons) circulating through the system, much of it pooling in the valve train. To reduce this, later designs moved towards O-ring sealed valve covers. These older engines were also less durable, often requiring a rebuild after just 500 race miles. However, by optimizing the blocks and using lighter, stronger materials, later engines could last for 1,000 to 10,000 race miles between rebuilds. Each rebuild involved over-sizing the bore, eventually leading to the need for new pistons.

Goal: Explain advancements in oiling systems and increased engine lifespan

Tools and materials

  • Engine Block — Optimized design for increased durability
  • Pistons — Replaced during engine rebuilds
  • Valve Cover Gaskets — Improved oil sealing and reduced pooling in later engines
  • Engine Oil — Lubricating the engine, a significant quantity in older designs

What they say

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the physical position you know I can't give you the science behind it did y'all ever run these things police emerged we did yes yeah yeah doing that kids too we ended up trying to just for the same reason harmonics you just basically ran it filled huh which the crew chiefs didn't like the oil of tops you take you know about four gallons of oil to get this thing full the whole valley tray in the top yeah so they were four gallons of oil with that one um and then you gotta put our three gallons running through the system at all times in the tank so there's seven gallons of these cars back in the day merge it and then we have to go from running regular valve cover gaskets to o-ringing everything I need to be overring and really good torque load on even clamp on these flanges so you would have oil hemorrhaging out of the valve cover during the race you look there you've got gaskets under those valve covers that's a little cork yeah and then you get over here and it's all over and then I like how you bring out the firing order How is the the firing order changed because you get mixed answers from what it was to what it is now I'm trying to think I've got my Chevrolet I'll get my hat back out but um the typical 18 degree SP2 is a standard uh one eight four three six five seven two um yes yes yep that was it and you line them up and I'd like to qualify those broken off Springs I have to line them back up I did this one time and it was basically third cylinder Left Bank was always breaking and Ford and Chevrolet it was interesting like the order all older designs the the way it's numbered is different but the the actual pattern the sequence yeah yeah because didn't the earlier Fords have like four and seven and two and three swap from a Chevy teens would do that teams Jack Ross is very well known it actually designed cams for that and then we had another engine builder show up one year and was mad because he was not running well and uh exposed Jack roush's firing order because no one ever knew it the car sounded very different in Daytona didn't sound really good but they ran better and that's back in the days of running you know 17-1 compression ratio 18 to 1 back of the play raises Jack was very Innovative figured out a firing order work it had his Cam's ground to it there was a year that Jack had to change all of his cams with the racetrack

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