Exhaust Port Size - Toyota Yaris Forums

ChinGy · 08-16-2011, 09:44 AM

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.

cali yaris · 08-16-2011, 09:46 AM

Welcome to the forums.

That's the 1.8L right? Do you still have your stock header?

ChinGy · 08-16-2011, 10:49 AM

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.

malibuguy · 08-16-2011, 07:17 PM

Smaller runners reach peak velocity sooner building torque

ChinGy · 08-16-2011, 08:57 PM

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?

08-16-2011, 09:44 AM	#1
ChinGy Drives: Yaris T Sport Join Date: Jan 2011 Location: London Posts: 6	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
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Welcome to the forums. That's the 1.8L right? Do you still have your stock header? __________________ 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, 07:17 PM	#4
malibuguy Obsessed with 1.5L Drives: '10 PW Yaris Sedan Join Date: Feb 2011 Location: Westminster, MD Posts: 907	Smaller runners reach peak velocity sooner building torque __________________ -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

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08-16-2011, 10:49 AM	#3
ChinGy Drives: Yaris T Sport Join Date: Jan 2011 Location: London Posts: 6	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, 08:57 PM	#5
ChinGy Drives: Yaris T Sport Join Date: Jan 2011 Location: London Posts: 6	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?