Machining NPI Heads while on the block - TCCoA Forums
 
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post #1 of 11 (permalink) Old 10-05-2006, 05:20 PM Thread Starter
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Machining NPI Heads while on the block

Anyone have any thoughts about how this guy port matched his heads to the PI intake? Safe? Foolish?

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post #2 of 11 (permalink) Old 10-05-2006, 06:34 PM
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Hackjob, waste of time. I've also never seen an Explorer intake like that, only seen those intakes on trucks and vans, Explorer looks like a car intake.

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post #3 of 11 (permalink) Old 10-05-2006, 06:38 PM Thread Starter
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Quote:
Originally Posted by kdanner
Hackjob, waste of time. I've also never seen an Explorer intake like that, only seen those intakes on trucks and vans, Explorer looks like a car intake.
Yea, I was wondering about that intake to. I was more curious about working ont he heads while they were on the car. Think the tape and grease would keep the shavings out?


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1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
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post #4 of 11 (permalink) Old 10-05-2006, 08:33 PM
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my cousin dave ports and polshes heads and intakes while on cars. he stuffs the cylnders with duct tape shaped like a funel then stuffs it with fine steel wool. No problems. But machining is someting else... bad choice

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post #5 of 11 (permalink) Old 10-05-2006, 08:37 PM Thread Starter
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Ok, I might have mistakenly used the words "machining" and "porting/polishing" interchangebly. Is what this guy did relatively safe?


1997 Thunderbird Sport
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1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
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post #6 of 11 (permalink) Old 10-05-2006, 08:38 PM
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Can someone tell me a little bit more about that type of intake?
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post #7 of 11 (permalink) Old 10-05-2006, 08:39 PM Thread Starter
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It looks like one of the intakes used on the trucks and vans. might work on a Thunderbird, if you like either holes in your hood or one big a** cowl.


1997 Thunderbird Sport
Low Miles
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destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
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post #8 of 11 (permalink) Old 10-06-2006, 12:26 AM
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Port matching is worth very little on a stock-ish motor. In fact, because it opens up the port it's possible to LOSE power. Also, the mismatch between NPI and PI heads is hardly noticeable.

Here are two examples. The NPI port is on the head, the PI on the intake. Both have been worked, but notice they didn't open it up to the edge of the gasket.


As for the coolant port, that is something I would do if I knew someone who welds aluminum.




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post #9 of 11 (permalink) Old 10-06-2006, 12:46 AM
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they way he do it i would only do it with a vacumm next to it to suck it up and the duct tape stuff act as a secondary precaution.

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post #10 of 11 (permalink) Old 10-06-2006, 12:48 AM Thread Starter
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Thats not a bad idea either.


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
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post #11 of 11 (permalink) Old 10-06-2006, 07:52 AM
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I would say you could do it with the cams removed so all the valves are closed, then vacuum out what was left behind. However anyone that port matches to the gasket especially the PI gasket since it is so oversize has no clue how much worse their velocity probably is. The best intake port is usually a smooth taper down from the plenum to the bowl and you have to think of the intake manifold as an extension of the head. From what I saw in those pictures it looks like he made 2 bell mouthed junctions at the gasket which when bolted together is a big bubble area inside of a tube (bad for flow in the tube) A generic "gasket match" is probably the most common mistake by newb home porters I imagine especially since the magazines spout it so much.

BTW - You need to work the bowl of that head also to increase the flow, what he did didn't change the flow in the head I would imagine since that isn't where all the restriction is.
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