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Originally Posted by Piotrsko
No to argue, but I always understood higher compression lead to higher engine efficiencies,
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Higher compression DOES lead to higher efficiency, (note diesel efficiencies) but will it gain the percentage of MPG that offsets the percentage of higher fuel costs?
$2.59 regular, $2.84 Mid Grade, = 9.65% increase in price.
$2.59 regular, $3.04 Premium, = 17.37% increase in price
On a fifty MPG car, you would need 54.81 MPG, and 58.68 MPG respectively to justify the higher cost fuel.
Quote:
Originally Posted by Piotrsko
and a slew of drivaeability problems with preignition, lope, and power induced throttle mania.
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This is why you must step up to a higher octane rated fuel.
Quote:
Originally Posted by Piotrsko
Valve clearance can be increased by recessing the seats and using shorter valve lift on shorter stems or a non interference cam
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Yes, or leave the head and block alone, and weld something into the head beside the valve heads - think stove bolt heads - and mill those down to clear the piston crown. I don't know how much one would want to mess with valve work. A lot of math would have to go into this, so------Engine Shop.