Then the 210 c.i. 170 makes a lot of sense.

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“Buy the ticket, take the ride.”
― Hunter S. Thompson

Why not?

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Got it! Can't wait to see it run!

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2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!

12.70 @ 104.6

You gonna be runnin’ gas err alky haul?

It’d be fun to get our light cars paired up along with Ryan.

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Rob

I’m Mater
The Kentucky Poser

That's a good question...lol.

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“Buy the ticket, take the ride.”
― Hunter S. Thompson

When I set up the original class record rules I tried to set the weight breaks to equalize things between the 170 and 225 based engines. I didn't really contemplate the 170-198 combo, which might prove to be very competitive if you could build a good one. I don't believe I ever said anything about what you could do with the crank as long as you use the original block, several racers have stroked their 225 cranks over the years. If you could build a car that weighed only 2,000# it would take about 265HP to go 11 flat in B/G. That would be 1.26 HP/Cu. In. assuming 210". To do the same thing with a 225 based motor, say 238" would take 310HP or 1.30 HP/Cu. In. It should actually be easier to produce higher HP/Cu. In. in the smaller motor. My Computech computer is dead so these numbers came from a Moroso slide rule that I don't consider to be as accurate, but I believe the relation between the two combinations is valid. Go for it!

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If you didn't drive it there, it's not a street car.

A lighter car with a smaller engine will always be quicker/faster if the HP/cube is the same.
Remember the formula for acceleration. If you double the weight, you must increase the power by 4 times to be equal.
That's one of the reasons why in the old days of class racing in the weight/cube classes, the heavy hitters were using "destroked" engines and light cars.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thanks for the numbers estimates, Seymour. I have been thinking about this for a long time (at least 15 yrs). That's how slowly I move...

1/4 mile time changes as the ratio (weight/HP) to the 1/3 power. That is what all the HP and time/ET calculators use. This is an approximation, but it works pretty well.

Lou

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