Quote:
Originally Posted by ULTRAZLS1
Fastest time is a 12.5.
Nascar motors are 220 psi and they are pushrod. Top fuel and funny cars use pushrod. The pushrod design is actually a newer design than ohc design.
Most all of the fastest cars in the world (6 seconds and below) use two valves per cylinder activated by pushrods from a centrally-placed camshaft.
We wont have to wait and see modded. It is who ever has the most money. If you are staying NA the advantage will be to the LS3. No way the 5.0 will make as much power as a 6.2 modded NA. Forced induction and or nitrous...may be the 5.0 from its strong internals.
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Not a single one of your examples had anything to do with what I said. None of these cars are even remotely drivable on the street or could be considered reliable. Top fuel and funny cars use pushrod engines with massive positive displacement blowers and they are REQUIRED to be this way by NHRA rules. Nascar engines are also carbed, idle like shit because of the insane cam profiles and would never be suitable for daily driving. If they were allowed to run DOHC in Nascar and were only limited by displacement, you better believe they would be running direct injected DOHC v8's rather than the OHV carbed engines they use, because they could make more power that way. My point is, using more advanced designs like DOHC, especially with variable cam timing and lift, allows more extreme BMEP and VE to be possible while still maintaining street drivability. You can't say, "well the ls3 will do X at 200psi BMEP and the 5.0 will do X at 200psi BMEP" because it is going to be much more difficult to do so on the ls3. I'm not saying DOHC is a better design than OHV, I'm saying it's a tradeoff. The ls3 uses a less efficient design, but it has a big advantage in displacement. The whole BMEP thing is just a bad comparison.