| If you would have read the text around it, you would understand why you are incorrect. "The HEMI Magnum engine has two valves per cylinder as well as two spark plugs per cylinder. The two spark plugs help to solve the emission problems that plagued Chrysler's earlier HEMI engines. The two plugs initiate two flame fronts and guarantee complete combustion. Disadvantages
If HEMI engines have all these advantages, why aren't all engines using hemispherical heads? It's because there are even better configurations available today.
One thing that a hemispherical head will never have is four valves per cylinder. The valve angles would be so crazy that the head would be nearly impossible to design. Having only two valves per cylinder is not an issue in drag racing or NASCAR because racing engines are limited to two valves per cylinder in these categories. But on the street, four slightly smaller valves let an engine breathe easier than two large valves. Modern engines use a pentroof design to accommodate four valves. "
To review:
Hemi = hemispherical
Hemi = two valves (never more)
VG = pentroof
VG = 4 valves VG != Hemi
Recursively Yours,
Kenny...
PETZ Member #5
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