High Compression Head

[Pete]

Originally Posted by jeepguy1948

What is y’all’s opinion on the best head gasket for an aluminum head?

Fel Pro 7013 for a street engine.
Solid copper with O-ring for race engine.

[Pete]

Originally Posted by johnneilson

No
The exit speed of mile 3 wins

Ha!

J

Very true, but he will also still have the biggest dyno numbers...lol

[jeepguy1948]

Thank you Pete

[ModelA29]

Originally Posted by johnneilson

No
The exit speed of mile 3 wins

Ha!

J

Only if you swap the engines into the same car for each test. Cheating the aero is a big part of it.



A car cruising at 50 mph may require only 10 horsepower to overcome aerodynamic drag, but that same car at 100 mph requires 80 hp. With a doubling of speed the drag quadruples. A car has a lower drag coefficient that only takes 8 horsepower to maintain 50 will only need 64 ponies to run 100.

[johnneilson]

I am still working on breaking 190 mph
We are pushing around 300 hp
Both the motor and I are sweating….
J

[updraught]

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Originally Posted by ModelA29

Only if you swap the engines into the same car for each test. Cheating the aero is a big part of it.
A car cruising at 50 mph may require only 10 horsepower to overcome aerodynamic drag, but that same car at 100 mph requires 80 hp. With a doubling of speed the drag quadruples. A car has a lower drag coefficient that only takes 8 horsepower to maintain 50 will only need 64 ponies to run 100.

If you use a smaller pulley on the two blade fan it'll pull all the air thru the radiator and create a vacuum in front of the car?

[Pete]

Originally Posted by updraught

If you use a smaller pulley on the two blade fan it'll pull all the air thru the radiator and create a vacuum in front of the car?

With a big enough fan, the car becomes an airplane and they do not let airplanes run in that class.

[Keith True]

The only performance numbers I ever thought to remember were told to me by Cummins engineering in the mid 80's.He said it takes 239 HP to maintain 65 MPH in a cabover truck with a box grossing 80,000,level road,no wind.He said there were variables,different gearing,radial or bias tires,smooth or outside post trailers,air quality,outside temp,etc.But,he also said that was a surprisingly accurate number even with all the variables.Came into my mind probably hundreds of times as I rowed with two sticks behind a 220 Cummins,hoping to hit 60.

[updraught]

One for sale:
https://www.ebay.com/itm/17602174552...gAAOSwBhNlTRay

[johnneilson]

Ohh, I have a fortune!
I have a pile of those laying behind the dyno shed
I’ll post the eBay link soon

Come and get them, John

[old31]

At that price you would think the guy would ship it for free, geeeeeez.