The Stock US Fiesta specs out at 63HP @5300 RPM. With a Formula Ford Intake & Carb, we achieved 110BHP. Sweet! lets see what she makes with the carb/manifold that will live in the car.
When we put the Weber 32/34 DFT 9A on with an XR2 intake manifold, we achieved 101 BHP. However, the dyno numbers showed rich fuel usage numbers. We drilled out the air intakes on the primary and secondary jets to .170, the Air/Fuel mixture was still running rich...Hmmm.
This run on the dyno had a couple issues. One, the fuel return line was not hooked up to a meter to subtract the fuel going back to the tank, so we are going back to the stock 155/160 air jet dimensions, and trying it again. Also we did not have the cold air box hooked up in the dyno room, so we loose power there. We should get a few HP back with the air box attached...I was told it could get back close to the 110HP mark, but I will assume 1/2 that gain for this power increase calculation.
Now when I took the engine in, and Curtis got it disassembled, he noticed their was a bushing issue that stopped the rotor from fully advancing the timing. That made perfect sense since it felt like it had about 40 BHP and gave up pretty early.
When we started to examine everything, we discovered .040 of taper in the cylinder walls...so as long as it is apart, lets make it right, ohhh, and add some high compression pistons...and balance everything....and lighten the flywheel... screw it, lets just rebuild it. And so we did.
I cannot wait to get this bolted back into the car and give it a proper thrashing.
105BHP/63BHP = 66% power increase.
Power to Weight Ratio
Stock 63 HP/1766 CW = 1 HP / 28.0 lbs
Rebuilt 105 HP/1766 CW = 1 HP / 16.8 lbs
seems like a huge boost great work
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