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Old 07-31-2003, 12:59 PM   #21
Betamax
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

another solution in search of a problem...
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Old 07-31-2003, 01:02 PM   #22
Betamax
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

I read that article...very true. On the other hand, Corvettes are the Buicks of the sportscar world...there are other sportscars that corner better than a vette...
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Old 07-31-2003, 02:07 PM   #23
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

If you cut the small block engine's dimensions by half, the cubic volume of the smaller engine, hence potential displacement, is just 1/8 of the larger engine. Forgive me if this is the umpteenth similar response. Just do the math: 30x30x30 block = 27,000 cubic inches. 15x15x15 block = 3375 cubic inches. Your half size engine should also weigh 1/8 as much, or 50 lbs. So what you end up with is a 50 lb, 50 cubic inch engine that makes 25 hp!
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Old 07-31-2003, 02:50 PM   #24
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

Are you saying that they gained weight or that they are light like the SV. Neither are near as light as the SV, which is why I brought it up.
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Old 07-31-2003, 02:58 PM   #25
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

The same guy (I think) recently built a V12.
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Old 07-31-2003, 04:19 PM   #26
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

However, if you compare any actual race car (like Formula One) instead of a street car to even a GP bike the GP bike would lose. Cycle World did this a while back with a Formula One car vs. Nicky Hayden's AMA Superbike and the Formula One car kicked its ass, plain and simple.
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Old 07-31-2003, 05:37 PM   #27
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Default One Word...Torque

As a Bueller I gotta tell ya, 85 lb/ft at the rear wheel between 2000-7000 RPM is a hell of a lot of fun. 150 lb/ft without having to rev it to 12 grand sounds good to me.
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Old 07-31-2003, 06:02 PM   #28
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Default Why not a V4?

I gotta problem with the geometry here...reducing the linear dimensions by a factor of 2 will reduce volume by a factor of 8.

So you'd get a 50 cubic inch engine...you're not gonna get those HP and torque numbers with an engine like that without some serious revs.

Why not just chop off the four rear cylinders? I'm not sure you'll get 1/2 the power from a V8 that's 1/2 the size of the original. you still have the same number of friction surfaces for one thing... (Kevin Cameron where are you when we need you?)

But cutting the motor in half will maintain 1/2 the power and torque for sure , assuming you can tune the intake and exhaust sufficiently, and it'll weigh 1/2 as much. It's size would be 15x30x30 though, pretty hefty for an ordinary bike but what the hell.. go for it!
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Old 07-31-2003, 07:25 PM   #29
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Default Re: One Word...Torque

A hiyabusa from 3k RPM (idle, basically) and up is producing 80 ft/lbs of torque. The myth that I4s are not "Torquey" is bull*****, the I4 hypersports (GSXR-1K, Hiyabusa) have huge amounts of torque over the entire revv range.

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Old 07-31-2003, 08:10 PM   #30
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Default Re: 200-inch Baby-Block Chevy-Engined Motorcycle!

However, an F1 car has enough downforce to run an upside-down track. I could be wrong, but I think I remember that the times for Superbikes at Laguna Seca were faster than the times for the GTS type cars. I forget what series they run in but they are the race versions of the Viper, Corvette, Saleen, etc. Wonder if there's a way to effectively make downforce on a bike.
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