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Re: 55* seat thoughts
[Re: B1MAXX]
#2489614
04/29/18 06:31 PM
04/29/18 06:31 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I've used a 55* seat many times. I now would only use it in a blown application or something with a ton of nitrous.
For the N/A stuff I use the 50 almost all the time.
Also, the flatter the port angle the less effective the 55* seat is. As you stand up it the port the 55* gets better.
Now that I've typed all that I would probably still use a 55* seat on a N/A application if the port angle was high enough to get the SSR back in shape.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 55* seat thoughts
[Re: B1MAXX]
#2489923
04/30/18 12:23 PM
04/30/18 12:23 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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Significant effect on the effective flow window during OL (since lift is low), should do better with 1-2 degrees less LSA.
Boffin Emeritus
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Re: 55* seat thoughts
[Re: rickseeman]
#2489996
04/30/18 02:36 PM
04/30/18 02:36 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I'm no expert. I don't think there is any useful benefit until you get over .800" lift. Not true.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: 55* seat thoughts
[Re: B1MAXX]
#2489998
04/30/18 02:38 PM
04/30/18 02:38 PM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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I'll have to see if I put a 55* on a spare valve if it will even leave a margin. 50* looks to have a lot of options. Guess I'll have to experiment. I was just wondering. I know there is a lot of variables bowl shape and such. Also somewhat concerned about durability. A freshen every few years ain't so bad. I also forgot to mention the under head shape of the valve. It's critical. A nail head and steep seats don't like each other. The steeper seats are also tougher on valve faces so you want a good margin.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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