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10-08-2023, 05:34 AM | #31 | |
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Re: Flat tappet lifter failure
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Last edited by Terry Cain; 10-08-2023 at 06:05 AM. |
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10-08-2023, 07:47 AM | #32 |
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Re: Flat tappet lifter failure
OK the spring pressure needed is a result of lobe profile (yes there are also some other factors). Do all brands have this same problem to the same degree, or is it more a function of lifter diameter? The larger the lifter diameter the greater the max velocity the lobe profile can have. If this is the case then MoPars would have less problems than GM with Ford in the middle.
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10-08-2023, 08:45 AM | #33 | |
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Re: Flat tappet lifter failure
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Doesn't that all get worked out in AHFS and HP factors? That is the assumption with all rules changes that affect engine performance. The main reason they don't check valve spring any longer is that it takes too long, the expense of the tech staff, the risk of being sued, and the expense of equipment. So the racer is paying for the decision again, and it still is not "fair" for everybody.
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10-08-2023, 09:57 AM | #34 | |
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Re: Flat tappet lifter failure
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AHFS doesn't work. |
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10-08-2023, 10:16 AM | #35 |
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Re: Flat tappet lifter failure
Roller cams will not solve the problem, and will not make it cheaper. It will only make it more expensive, change the failure mode, and cause more problems. It will create another R&D expense. It won't make anyone any faster, except maybe someone who has unlimited funds to invest in camshaft and valvetrain testing.Roller cams will simply cause more problems, and make nothing cheaper.
What will people cry about tearing up next? What rule change will they demand? How much will it cost? Where will it stop?
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Alan Roehrich 212A G/S |
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10-08-2023, 12:32 PM | #36 | |
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Re: Flat tappet lifter failure
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John Ancona 705 STK / SS |
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10-08-2023, 02:32 PM | #37 | |
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Re: Flat tappet lifter failure
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I'm quite sure that Dwight and Alan are very well aware of the cost of running flat tappets vs. rollers. YOU may be better served by understanding there IS a reason as to why many like running older cars that came equipped with flat tappet cams in an Eliminator called STOCK!
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10-08-2023, 03:42 PM | #38 |
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Re: Flat tappet lifter failure
Ya know, you can just never have enough "roller cams for the masses" discussions!
Deja Vu? https://classracer.com/classforum/sh...ad.php?t=60886
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10-08-2023, 05:17 PM | #39 | |
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Re: Flat tappet lifter failure
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Really? And you have how many class wins with your big block Stock Eliminator engines? Because I have more than 1-2. Oh, and I have a 9500 RPM+ 396-375 Super Stock engine as well. Maybe YOU can't make a flat tappet Stock Eliminator engine run. That does not mean the rest of us can't. There are a ton of VERY fast big block Chevy stockers out there running flat tappet cams and having zero problems. Maybe you should ask yourself why YOU can't.
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10-08-2023, 05:47 PM | #40 | |
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Re: Flat tappet lifter failure
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John Ancona 705 STK / SS |
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