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08-16-2011, 09:44 AM | #1 |
Drives: Yaris T Sport Join Date: Jan 2011
Location: London
Posts: 6
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Exhaust Port Size
Hello
I'm new to the forum. First time posting. Long time reader. I have a UK 1NZ-FE Yaris T Sport. I'm looking to have a custom exhaust header (manifold as we call it in UK) made up with longer runners to hopefully gain more power out of the engine. I currently have an OBX header which has been running fine for years, but I just want more out of the car. Does anyone know what the exhaust port size are? The fabricator is currently making the head flange and wants to know the measurements so that they could make the runner's diametre slightly bigger, and not too big. |
08-16-2011, 09:46 AM | #2 |
ULTIMATE
Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Welcome to the forums.
That's the 1.8L right? Do you still have your stock header?
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
08-16-2011, 10:49 AM | #3 |
Drives: Yaris T Sport Join Date: Jan 2011
Location: London
Posts: 6
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It's a 1.5L, NCP13.
I do have the stock header. It looks about 1.25" (31mm). The gasket bore size is about 41mm (just over 1.5") Which is rather odd as that would mean the runners are smaller than the ports. Shouldn't it be the other way around? With the exhaust ports being smaller than the runners. |
08-16-2011, 07:17 PM | #4 |
Obsessed with 1.5L
Drives: '10 PW Yaris Sedan Join Date: Feb 2011
Location: Westminster, MD
Posts: 907
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Smaller runners reach peak velocity sooner building torque
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-Greg...the Exhaust Freak. -10 PW sedan 107whp/110wtq, full exhaust, suspension bits, TRD LSD -06 Highlander 3mzfe Limited AWD -82 Malibu, 1uzfe swap -97 Tercel coupe, 1nzfe/4.31 -96 Tercel coupe, Turbo 5efe, autoX -96 Tercel 4dr |
08-16-2011, 08:57 PM | #5 |
Drives: Yaris T Sport Join Date: Jan 2011
Location: London
Posts: 6
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Great fact. But it would be nice if the runners were slightly wider than the port to stop reversion.
If anyone has a cylinder head out. Could you please confirm the exhaust port size? |
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