Allen George, get your slide rule out!

[Fathead Racing]

Allen, would you be so kind as to calculate my rear wheel HP on your handy slide rule? The 60 has ran a best of 12.62@107 mph. Car weights 4250.

 

[Tic's60]

I'll take a stab

406hp at the rear wheels 479 at the flywheel bang

http://www.speedworldmotorplex.com/calc.htm

 

[Dick MacKenzie]

I'll take one too. Using the following formulas for rear wheel horsepower:

HorsePower from MPH = ((.00426*MPH)^3)*WEIGHT

HorsePower from ET = ((5.825/ET)^3 )*WEIGHT

Where the ^ = cubed.


MPH calculation produces 402.5 HP
ET calculation produces 418 HP


Next..........
What does your slide rule say Allen?

 

[dq409]

OK,, so I did 4150# at 107,, = 397rw 468 fly
12.38 at 4150# = 432 rw 510 fly

I know,, I should be turning a higher MPH,,

I`ll work on that,,

So what does Allen find for me?

 

[rstreet]

OK,, so I did 4150# at 107,, = 397rw 468 fly
12.38 at 4150# = 432 rw 510 fly

So what does Allen find for me?

A new shop location to work on the MPH issue
Robert

 

[dq409]

A new shop location to work on the MPH issue
Robert

I`m working on that !!!

Problem is getting a loan on a garage that really doesn`t have real living quarters!!

Anyone wan`t to loan me some money for a few months until i can build a few bedrooms?
Good interest rate !!

 

[bluescreamer]

Allen George, get slide rule out!

Ray
At 107 Mph & 4250 # the rule says 405 hp. this rear wheel hp.
at 12.62 et. the rule says 360hp. at wheels. you can add between
50 and 80 hp for loss to get to the flywheel horsepower. Your 60'
is what is killing you in your et. hp readings. you should
be around 12.15 for 405 hp
Allen

 

[rstreet]

Ray
At 107 Mph & 4250 # the rule says 405 hp. this rear wheel hp.
at 12.62 et. the rule says 360hp. at wheels. you can add between
50 and 80 hp for loss to get to the flywheel horsepower. Your 60'
is what is killing you in your et. hp readings. you should
be around 12.15 for 405 hp
Allen

oh oh Ray maybe we should rethink those t/a's for more traction?
Robert