If some later TR4A engines were closed ventilation (improving air quality at
no expense to performance), why then were the earlier engines vented?
Especially if venting them was detrimental? I KNOW THAT THEY WERE NOT
THINKING ABOUT THE ENVIRONMENT.
Also, I think we're talking vented engines as being:
intake vent- at the valve cover
exhaust vent- being the road draft tube
Is this right?
Thanks,
Paul Dorsey
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