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Old 07-22-2012, 05:39 PM   #1
focusauto01
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Porting a cylinder head??

I'm looking at having my Cylinder head rebuilt to AERA Specs with a stronger valve train to avoid any potential damage to my SPI to the common SPI Failure.

My question is, if I have the cylinder head Ported for for flow, would this increase or decrease the fuel mileage (mpg) ??


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Old 07-22-2012, 07:19 PM   #2
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Glad to see someone sticking with the SPI, and doing something to the head to prevent damage, and add performance to the motor.

I would think MPG would go down just a little, but with a tune, I'm sure they could make it so little or no MPG is loss.
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Old 07-23-2012, 11:32 AM   #3
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I don't justify buying a whole new motor or transmission to fit my car. I love my SPI, I currently get 375 miles on a tank and have never had a problem with it besides suspension/steering issues such as struts, ball joints, etc. that is expected throughout the period of owning a car.

I can purchase a rebuilt head or a new head with stiffer valves for less then 500.00 with the gaskets. The only big problem I've heard with the SPI is the head. I would rather spend that $500. and fix the problem from the start rather then paying 1,000-2,000 for a differn't engine install. I have too much tied up in the SPI anyway to swap. New Air filters, fuel filters, plugs, wires, oxygen sensors, pcv valve, new oil filter, etc. I'll spend $500. prevent the problem then use the money left for something else.
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