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Talk to me about this 170 Block, 198 Crank Deal
https://www.slantsix.org/forum/viewtopic.php?t=64103		 Page 2 of 2
Author:  drgonzo [ Tue Oct 01, 2019 12:53 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
Then the 210 c.i. 170 makes a lot of sense.
Author:  Charrlie_S [ Tue Oct 01, 2019 12:55 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
Quote:
Not that I am about to set any records,
Why not?
Author:  Rick Covalt [ Tue Oct 01, 2019 2:51 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
Quote:
The A class, 2000-2349 Lbs.
Got it! Can't wait to see it run!
Author:  Rob Simmons [ Tue Oct 01, 2019 5:32 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
You gonna be runnin’ gas err alky haul?

It’d be fun to get our light cars paired up along with Ryan.
Author:  drgonzo [ Tue Oct 01, 2019 5:48 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
Quote:
Quote:
Not that I am about to set any records,
Why not?
That's a good question...lol.
Author:  Exner Geek [ Tue Oct 01, 2019 6:18 pm ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
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!
Author:  Charrlie_S [ Wed Oct 02, 2019 3:42 am ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
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.
Author:  Dart270 [ Wed Oct 02, 2019 6:53 am ]
Post subject:  Re: Talk to me about this 170 Block, 198 Crank Deal
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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