73, Dark Blue 454

I was researching some tech papers for building Nascar engines and I happened across a link that unlocks Nascar's biggest secrets. Pay particular attention to number 9,..I think that's where I'm missing some HP on the street:

http://www.ehow.com/how_2084687_buil...ar-engine.html

FRSTR90

That link is not working for.

The Spark

http://www.ehow.com/how_2084687_buil...ar-engine.html

Bangkok Dean

I don't understand how the engine would run at all with the intake valves open all the time the engine is running. No compression and how do you keep the exhaust from blowing out the Carb.

sailtexas186548

wow.

rihwoods

Step Five.
"Make sure all the engine parts fit together tightly and perfectly. The tighter the fit, the more power the engine is able to produce. The parts in NASCAR engines need to fit together more tightly than in normal car engines."

No kidding, Dick Tracy...???

rihwoods

The NASCAR engines have extremely radical cam profiles, which open the intake valves much earlier and keep them open longer than street cars. This allows more air to be packed into the cylinders, especially at high speeds.....

73, Dark Blue 454

On building a Nascar engine, the difficulty rating is said to be "Moderately Challenging".

tfi racing

Nothing to it.Just ask Toyota-the largest car company in the world-how challenging it is to build a simple carbureted,pushrod Nextel Cup engine that only spins 9800 RPM! If they only spent several hundred million dollars in the last couple of years to come close to being competitive with Roush and Hendrick,I can't see why some budding engine builder shouldn't be able to do it in his backyard shed!

wesleyshawn

"Once opened, the intake valves should stay open until the car is turned off or slows below a pre-determined speed."

So that's what I've been doing wrong, when I build engines the intake valves don't stay open lol

L88Plus

Dayum! Now I gotta go crank poly locks down on all my intake rockers. And just when I thought I had it running right.
I think the "moderate" level of difficulty is the best part.
Me and Bubba and an old 2-bolt 350 should be able to get 'er done with my 1/2 set of part SAE, part metric sockets and a crescent wrench.
Move over, Jimmy Johnson, we is a comin' thru!

jim2527

Arent race engines build loose to decrease friction?

I know I read somehwere about designed in intake valve float...Ferrari did it on something.

international blue

OK, but this is not for the street. Any racing engine does not need to be terribly efficient or street friendly and anyone with a true NASCAR type engine won't have happy neighbors.

Remember that an engine that operates at 9000 rpm doesn't do much below 1500-1800 rpm.....

Racing engines are designed for use rated in hours, street engines for a couple years. How many guys want a 20 hour engine?

jim2527

I know at least 2 guys who would...

Dale Jr. and Mikey

jonfor

i know their secret:

unlimited amounts of money.

my mach 5

Bingo!!!!

Bangkok Dean

OK now will someone post as to just how you get that kind of money

68 NJConv 454

win

63mako

Prime example of total posted by someone that is totally clueless on the internet.

73, Dark Blue 454

Seems a few are taking these building tips seriously,..makes me wonder.