Drag race - Kirkham 65 side-oiler vs Ferrari 458 italia

[dcdoug]

Hey Tommy,

Wish I could join you and our CACC boys on Tues at the track. I have a 427 S/O and Billboards, not as light or as high HP as Blitz's, but could have given you a benchmark of sorts. Take vids pls!

[Mdman352]

What gets you to the finish line first??? Torque or horsepower???
Does it matter if a motor makes 600 horsepower at 5800 rpm or 7200 rpm???

[DMXF]

Originally Posted by Mdman352

What gets you to the finish line first??? Torque or horsepower???
Does it matter if a motor makes 600 horsepower at 5800 rpm or 7200 rpm???

Alot of the myths are debunked here: http://www.lainefamily.com/hp.htm

The big problem with making alot of torque at a lower rpm is greater difficulty in getting the tires to hook up, then the power drops off after you're going down the track when you need it most. A number of the highly turbocharged tuner cars limit the boost in the lower gears so you can get off the line better and then they let it come in after torque multiplication is lower in the higher gears.

[Mdman352]

Some members of the Capitol Area Cobra Club have been invited to the Maryland International Raceway as Tommy G. practices and Dan watches.
While originally skeptical this thing keeps unfolding. Many thanks to Tom for graciously extending a welcome to the Club.
Stay tuned. Movies at 11.

[ICBomber90]

I'm betting it catches on fire...

[Excaliber]

How much experiance with hydraulic rollers do you actually have?

Enough to know:
5,800 to 6,200 rpm is "common" for hydraulic roller cam. Anything above that rpm is not "common". There are a few examples, here and there, of high dollar motors equiped with the newest light weight hydraulic valve train components that can do higher. But not many.

Even with a solid roller cam, I'd think twice before I ran a FE style 510 cid to 7,000!

Z06, is not common.
Dedicated drag race motors, are not common.
BBC in Cobras, are not common.
SOHC, is not common.

Can ANYONE post an example of a 500+ cid FE style motor (Shelby, Dove, Side Oiler, etc.) spinning 7,000 rpm with HYDRAULIC ROLLERS? If so, that is one RARE motor (and KC built it).

The original question was: Can BLITZ turn 7,000 with his 510 cid KC motor? The answer depends on several variables, but the cam is the big one. It's not likely with a hydraulic roller and that cid.

[undy]

Given the required budget, it's easy to build a 500'+ FE that will turn 9K...

Here's the recipe:

Titanium Rods
light weight forged pistons
Lightened, knife edge billet crank.
T&D rockers
titanium intake valves
sodium filled exhaust valves
custom bee-hive springs
titaium retainers with tool steel 10deg locks.

Most of the strokers are built with heavy h-beam rods, heavy crank and a valve train targeted at 6K RPMs.

There's no TYPICAL engine the Keith builds. If the customer wants a real twister, Keith will build it for them. The depth of your pockets in relationship to one's desires is the only limiting factor. I would agree that Keith builds more hydraulic rollers than solid rollers.

The Z06 is a lot more COMMON and TYPICAL than ANY Cobra is, big block small block or 500"+ stroker.

BTW... did I miss it where it's proof positive that Blitz has a hydraulic roller?

[Dwight]

Mdman352 Question for the masses

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What gets you to the finish line first??? Torque or horsepower???
Does it matter if a motor makes 600 horsepower at 5800 rpm or 7200 rpm???

this is a comment that I hope bring a lot of response.

I have read that it takes torque to move the weight of the car and rpms to move it at speed. The way I understand it, a car with 600 foot lbs of torque and 500 hp would be slower than a 600 tq with 800 hp.

What do the experts have to say about this?

Dwight

[Dominik]

500 rwhp and 450lbft in the Cobra is enough to win.
Just get it on the ground. Which reminds me: How are the practice runs coming along??

[Don]

Yes, Las Vegas does have Umbrella Girls for automotive events:

http://www.emmegirls.com/Umbrella_Girls.html

Kirkham Motorsports might be introducing a new umbrella, made of polished aluminum with the KMU logo, the frame work and handle machined from aluminum billets.

Maybe Buzz can enhance the cartoon.......

[DanEC]

Originally Posted by Dwight

this is a comment that I hope bring a lot of response.

I have read that it takes torque to move the weight of the car and rpms to move it at speed. The way I understand it, a car with 600 foot lbs of torque and 500 hp would be slower than a 600 tq with 800 hp.

What do the experts have to say about this?

Dwight

Exellent question for discussion. Unfortunately, I think a 2200 lb, all-up Kirkham (minus driver) kind of puts a different twist on things. The tires and wieight transfer are probably the key to breaking the initial resting inertia - and after that there is a probably a surplus of torque to slingshot the thing along if the tires can continue to get bite and then HP to accelerate it through the traps. Torque and HP are so inter-related (basically components of the same formula - one used to calculate the other) that their influence on a quarter mile time are tough to completely separate. Vehicle dynamics, peak rpm range, gearing, etc will all influence it. Peak mph in the quarter are usually associated closest with HP. And torque with the launch and at least 60 ft. times if not first 1/8 mile time. But, it's logical that there is a huge area of shared influence over the course of the 1/4 mile.