Quote:
Originally Posted by FATTEMUNK
I dont think it is drag, I think its DOHC vs OHV. Do some airflow mods and they will be better matched.
Edit: Just saw the transmission comments, I also think that is the culprit...
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It's totally drag. Just so you know the equation for drag is a function of the velocity squared. So as you go from 40 to 80 miles per hour, your drag doesn't double, it quadruples.
Put your hand out of your car window at 50 MPH. You can see from that, there is a very large force associated with that speed. 150 MPH is three times faster, which would mean nine times more drag at 150 MPH than 50 MPH. That is just about an order of magnitude greater! So if your amount of drag at 50 MPG is 30 lbs. of force, it will be 270 lbs. of force at 150 MPH.
So, yes, aerodynamic drag is the most likely factor here in this test. If it were the engine (OHV vs. DHOC) like you said, that difference would appear at low speeds as well as high speeds (assuming you keep the two cars in meat of their respective power bands). Not JUST at high speeds. And not JUST high speeds that not-coincidentally are the speeds where aero is known to be the defining factor.
Yes, gearing plays a role, but OHV vs. DHOC is not a factor, because it would be a factor at lower speeds as well.