DiscussWorldIssues - Socio-Economic Religion and Political Uncensored Debate - View Single Post - 18 minutes of SuperLeggera V10 goodness? Thank you!!!

**didrexx** · 05-08-2011, 08:07 AM

May I ask what your buddy does for a living? He's obviously doing something right.

[thumbup]

He developed one of the most successful PCM tuning applications out there. He's low key so I won't post his website. But he's easy enough to find, he has his company logo on the Viper.

Yes, but assuming similar displacement.

This is an oversimplification but it can summed up like this.

More cylinders in a given displacement make smaller, more efficient combustion chambers. The flame front has less distance to travel so you get a more complete burn. Fuel can only burn so fast. As the piston is pushed down by the flame front the cylinder volume increases and cylinder pressures drop. When cylinder pressures drop the flame front cools more rapidly...and the cycle repeats until the exhaust valve is opened and the burnt mixture is vented. So a smaller cylinder volume reduces pumping losses and keeps higher average cylinder pressures for more of the power stroke.

On the down side the rotating assembly is more complicated and thus more prone to failure. Its also heavier so and since it has more moving parts it loses more to friction as well.

Another engine fact for you. V6, V10 and V12s are flat plane cranks, meaning the engine actually acts like two inline engines joined by a single crankshaft. V8's however can function like as a flatplane crank, or a cross plane crank. The difference is the firing order. A V8 with a flat plane crank is unbalanced. All out V8 powered race cars designed from the ground up use a flat plane crank because it has a much lighter rotating mass at the expense of higher order harmonics. A Crossplane V8 is a heavier crank, but is an inherently balanced engine so it doesn't need a balance shaft.

But in the end in a V8 crossplane vs flatplane can be summed up by these two youtube clips.

Flat Plane V8 - http://www.youtube.com/watch?v=_qtd2yxvVR0

Crossplane V8 - http://www.youtube.com/watch?v=fgMPMZjp4mE

Can you tell the difference? You'll want to turn up the volume REAL LOUD for these two engines. They are eargasm inducing.

And just for kicks how about a V16 engine? Very nice, but not cost effective and prone to reliability issues so you don't see them anymore. V8s, V10s and V12s seem to provide the best combination of reliability and power.
http://www.youtube.com/watch?v=fZMPDCNyQxE

05-08-2011, 08:07 AM	#8
didrexx Join Date Oct 2005 Posts 481 Senior Member	May I ask what your buddy does for a living? He's obviously doing something right. [thumbup] He developed one of the most successful PCM tuning applications out there. He's low key so I won't post his website. But he's easy enough to find, he has his company logo on the Viper. Yes, but assuming similar displacement. This is an oversimplification but it can summed up like this. More cylinders in a given displacement make smaller, more efficient combustion chambers. The flame front has less distance to travel so you get a more complete burn. Fuel can only burn so fast. As the piston is pushed down by the flame front the cylinder volume increases and cylinder pressures drop. When cylinder pressures drop the flame front cools more rapidly...and the cycle repeats until the exhaust valve is opened and the burnt mixture is vented. So a smaller cylinder volume reduces pumping losses and keeps higher average cylinder pressures for more of the power stroke. On the down side the rotating assembly is more complicated and thus more prone to failure. Its also heavier so and since it has more moving parts it loses more to friction as well. Another engine fact for you. V6, V10 and V12s are flat plane cranks, meaning the engine actually acts like two inline engines joined by a single crankshaft. V8's however can function like as a flatplane crank, or a cross plane crank. The difference is the firing order. A V8 with a flat plane crank is unbalanced. All out V8 powered race cars designed from the ground up use a flat plane crank because it has a much lighter rotating mass at the expense of higher order harmonics. A Crossplane V8 is a heavier crank, but is an inherently balanced engine so it doesn't need a balance shaft. But in the end in a V8 crossplane vs flatplane can be summed up by these two youtube clips. Flat Plane V8 - http://www.youtube.com/watch?v=_qtd2yxvVR0 Crossplane V8 - http://www.youtube.com/watch?v=fgMPMZjp4mE Can you tell the difference? You'll want to turn up the volume REAL LOUD for these two engines. They are eargasm inducing. And just for kicks how about a V16 engine? Very nice, but not cost effective and prone to reliability issues so you don't see them anymore. V8s, V10s and V12s seem to provide the best combination of reliability and power. http://www.youtube.com/watch?v=fZMPDCNyQxE
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