Port and polish 4 cly head - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-08-2001, 09:53 PM
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Port and polish 4 cly head

has anyone heard or went and ported and polished the head on a 2.5L motor? or does anyone think it would help out anything significant or is it just a waste of time? thanks

1988 Wrangler Laredo 4.2L w/5spd Manual
1995 Wrangler 2.5L w/ 5spd / 31"BFG AT's
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post #2 of (permalink) Old 03-08-2001, 10:03 PM
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Re: Port and polish 4 cly head

Porting and polishing(p&p) generally only helps a little and mostly in the upper RPM range and then you need to have the cam and intake & exhaust to flow well enough for this to make a differance,so unless you want to build your motor up enough to take advantage it probably would not be worth your time and effort.

post #3 of (permalink) Old 03-08-2001, 11:37 PM
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Re: Port and polish 4 cly head

What he said [img]/wwwthreads_images/icons/smile.gif[/img]

<font color=blue> Muddynut </font color=blue>
<font color=red>[img]/wwwthreads_images/icons/cool.gif[/img] 78 CJ7 "Issues" </font color=red>[img]/wwwthreads_images/icons/cool.gif[/img]
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post #4 of (permalink) Old 03-09-2001, 08:27 AM
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Re: Port and polish 4 cly head

From what I gather a 3 angle valve job is your best bang for the buck. This concept of polishing is bad for low rpm use. The natural roughness of the walls allows fuel to come out of suspension and cling to them. During a low rpm, full throttle tromp the fuel droplets come off the walls and help the temporary the lean condition. Race motors, yes..off road, no.

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