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 Post subject: Overhead Cam at 14K RPM
PostPosted: Tue Mar 29, 2016 9:19 am 
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https://youtu.be/nsa6kq-qqIE


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PostPosted: Tue Mar 29, 2016 9:34 am 
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Looks like they need more spring pressure.


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PostPosted: Tue Mar 29, 2016 9:47 am 
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After seeing videos like this, it just surprises me that anything can live in a high performance engine.

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PostPosted: Tue Mar 29, 2016 8:30 pm 
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This is pretty cool to watch too
https://youtu.be/vcyT18qk8ls


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PostPosted: Thu Mar 31, 2016 8:54 am 
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this one shows valve float frame by frame
https://youtu.be/_REQ1PUM0rY


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PostPosted: Sat Jun 18, 2016 3:23 pm 
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What does NASAR use to run 500 miles at 8000+ RPM? Besides money....


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PostPosted: Mon Jun 20, 2016 8:29 am 
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I believe they are still push rod engines and I hear they are hitting 10,000 on a regular now


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PostPosted: Mon Jun 20, 2016 9:35 am 
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55F100 wrote:
What does NASAR use to run 500 miles at 8000+ RPM? Besides money....


Light weight parts, a lot of spring pressure, and they run near perfect geometry as far as pushrods and rocker arms are concerned.

They also run flat tappets which take a little bit of weight out of the equation just in itself compared to a roller rocker.


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PostPosted: Mon Jun 20, 2016 1:49 pm 
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They used to run flat tappets. They switched to solid rollers on the Cup engines this year.

When it was a flat tappet deal, they ran steel core camshafts with DLC coated tool steel lifters. Expect to pay $1500 just for a set of flat tappet lifters.

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PostPosted: Mon Jun 20, 2016 2:31 pm 
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blykins wrote:
They used to run flat tappets. They switched to solid rollers on the Cup engines this year.

When it was a flat tappet deal, they ran steel core camshafts with DLC coated tool steel lifters. Expect to pay $1500 just for a set of flat tappet lifters.


I didn't know that. Here's one for you then Brent. If you're switching to a roller cam, but keeping the profiles and events relatively the same, how much more spring would you need compared to a flat tappet? I would assume the extra weight would necessitate more pressure, but how much more is the question.

Also, do you know if they run regular needle rollers or do they use pressure fed bushings? I would think it would be bushed for durability but I guess that would depend on the frictional/durability characteristics.


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