Quote:
Originally Posted by Cmicasa the Great XvX
OHC vs OHV Weight... SIZE
People often fail to see in the Liters vs Liters argument is WEIGHT and SIZE... specifically when engines are "dressed..." which is really the only way to run them anyway.. For example...
In a comparison somewhere between the weight of the LS7 7.0L, LSA 6.2L S/C versus the Ford 5.4L S/C... the LS7 was lighter. In fact, if I remember correctly the LSA weighed in at approx 490lbs...including the addition of a SuperCharger ... the LS7... 458 pounds, while the Supercharged 5.4L in the GT500 I could swear weighs about 740lbs...
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OHV engines long have and always will represent a smaller, overall package size than OHC engines can for obvious reasons. That said, the weight disparity is always blown out of proportion.
Example? The 4.6L SOHC/3-valve V8 weighs about what the 6.3L LS3 does fully dressed. Since we already that the new 5.0L weighs within pounds of what the outgoing 4.6L 3-valve does we have situation where engines with relatively similar power ratings aren't every far apart. If you try and match the LS engine in terms of overall displacement you'll gain some weight on the Ford engine to be sure, but it wouldn't be a huge disparity. A well designed OHC motor will remain relatively close to the overall weight of an OHV design.
As such, and as I said earlier, the real advantage for the OHV setup in this regard is packaging.