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Dirty old pushrods


Rod

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I don't care who you are or what your flavor of ride is.  One thing is for sure.  The Vette is without a doubt the best "supercar" for the money.  Not even a close second.  Sure, fit and finish may not be "Ferrari-ish".  Bit you can cover it with the checkered flag if that bothers you too much.  :lol:

My last one set up for auto-X

DSCN0458 (2).jpg

 

 

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OK motor-heads.

I can NOT authenticate the following. But I read it, found it interesting, and thought perhaps you would too:

  

Dragster

One top fuel dragster 500 cubic inch Hemi engine makes more horsepower

than the first 4 rows of stock cars at the Daytona 500.

It takes just 15/100ths of a second for all 6,000+ horsepower of an NHRA

Top Fuel dragster engine to reach the rear wheels.

Under full throttle, a dragster engine consumes 1-1/2 gallons of nitro

methane per second. A fully loaded 747 consumes jet fuel at the same rate

but with 25% less energy being produced.

A stock Dodge Hemi V8 engine cannot produce enough power to drive the

dragster's supercharger.

With 3,000 CFM of air being rammed in by the supercharger on overdrive,

the fuel mixture is compressed into a near-solid form before ignition.

Cylinders run on the verge of hydraulic lock at full throttle.

At the stoichiometric (stoichiometry: methodology and technology by

which quantities of reactants and products in chemical reactions are

determined) 1.7:1 air/fuel mixture of nitro methane, the flame front

temperature measures 7,050 deg F.

Nitro methane burns yellow. The spectacular white flame seen above the

stacks at night is raw burning hydrogen, dissociated from atmospheric water

vapor by the searing heat of the exhaust gases.

Dual magnetos supply 44 amps to each spark plug. This is the output of

an arc welder in each cylinder.

Spark plug electrodes are totally consumed during a pass. After

halfway, the engine is dieseling from compression, plus the glow of exhaust

valves at 1,400 deg F. The engine can only be shut down by cutting the fuel

flow.

If spark momentarily fails early in the run, unburned nitro immediately builds up in

the affected cylinder and then explodes with sufficient force to blow

cylinder heads off the block in pieces or split the block in half.

In order to exceed 300 mph in 4. 5 seconds, dragsters must accelerate an

average of over 4G's. In order to reach 200 mph (well before half-track),

the launch acceleration approaches 8G's.

Dragsters reach over 300 miles per hour before you have completed

reading this one sentence.

Top fuel engines turn approximately 540 revolutions from light to light!

Including the burnout, the engine must only survive 900 revolutions under

load.

The redline is actually quite high at 9,500 rpm.

Assuming all the equipment is paid off, the crew worked for free, and

for once NOTHING BLOWS UP, each run costs an estimate $1,000.00 per second.

The current top fuel dragster elapsed time record is 4.428 seconds for

the quarter mile (11/12/06, Tony Schumacher, at Pomona , CA ). The top speed

record is 336.15 mph as measured over the last 66' of the run (05/25/05 Tony

Schumacher, at Hebron , OH ).

Putting all of this into perspective:

You are driving the average $140,000 Lingenfelter 'twin-turbo' powered

Corvette Z06. Over a mile up the road, a top fuel dragster is staged and

ready to launch down a quarter mile strip as you pass. You have the

advantage of a flying start. You run the 'Vette hard up through the gears

and blast across the starting line and pass the dragster at an honest 200

mph. The 'tree' goes green for both of you at that moment..

The dragster launches and starts after you. You keep your foot down

hard, but you hear an incredibly brutal whine that sears your eardrums and

within 3 seconds, the dragster catches and passes you. He beats you to the

finish line, a quarter mile away from where you just passed him.

Think about it, from a standing start, the dragster had spotted you 200

mph and not only caught, but nearly blasted you off the road when he passed

you within a mere 1,320 foot long race course.

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Yeah.

Too bad.

Pushrods are obsolete, entirely unnecessary.

My boss used race 5/8 mile oval track in Middletown, NY. He was doing pretty well, but a rocker-arm broke, and it sent the pushrod up through and part way out of the valve cover.

I doubt F1 engines have pushrods.

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  • Platinum Contributing Member
4 hours ago, Zambroski said:

I don't care who you are or what your flavor of ride is.  One thing is for sure.  The Vette is without a doubt the best "supercar" for the money.  Not even a close second.  Sure, fit and finish may not be "Ferrari-ish".  Bit you can cover it with the checkered flag if that bothers you too much.  :lol:

My last one set up for auto-X

DSCN0458 (2).jpg

 

 

That is just badass Z Dog! :bc:

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" Pushrods are more efficient too " #16

I'm willing to review your data.

But your assertion is counter-intuitive.

A pushrod valve-train has the following lubricatable bearings:

 - Cam to lifter

 - pushrod to rocker

 - rocker to valve stem

BUT !!!

On an overhead cam engine the cam lobe operates the valve stem more directly.

That eliminates some of the flimsiest components in the engine.

That enables a higher red-line.

That enables more power strokes per minute.

That enables a higher power output.

Again:

" Pushrods are more efficient too " #16

I DOUBT it. But I'll be delighted to review your data, if / when you post it. (don't worry, I know you won't)

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