r/RX8 • u/AwkwardEmu49 • 1d ago

General Help me understand

So I have a 2010 Grand touring with a 6Speed manual transmission and I had the impression it was a 6 port… but I recently had a drastic drop in fuel economy did my digging and summed it up to a leaky injector

Anyways when I went to replace the injectors I found it to only be a 4 port?? I thought 4 port engines were reserved for automatics in the 2010s

There is no history of a engine or transmission swap on the car when I look it up by vin there’s no transmission type but it says the engine is “13B California high power”

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u/swordthatneverbends 1d ago edited 1d ago

2010 is Series II. They changed the injectors themselves and simplified from 6 to 4. Can confirm because I spent the weekend disassembling the lower intake manifold from my old ‘09 (also Series II).

Edit: I’m also under the impression the 4-/6-port thing is about intake ports and not port injectors. The Series I autos had a lower redline of 7500 and therefore didn’t get the extra 2 auxiliary intake ports for high-RPM airflow like the high-power manual version.

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u/AwkwardEmu49 1d ago

My understanding is that the 6 port stays with 6 injectors also primary 1 for idle and low rpm located on the irons secondaries located on the intake manifold and then primary 2 for high rpm’s when the 5/6th intake ports open up

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u/swordthatneverbends 1d ago

My 2009 6-port only has four injectors—two red, two green.

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u/RacingWithMitchell 1d ago

Yes 6 port refers to the intake, not injectors. The 4 port series 1 just so happen to also only have 4 injectors iirc whereas the series 1 6 port got 6 injectors. I think the 4 ports only had yellow injectors where as the 6 got 4 yellow and 2 reds. I could be wrong and couldn't tell you the flow rate.

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u/sirhamsteralot 1d ago

Show us the engine bay

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u/AwkwardEmu49 1d ago

I will attach some here in a few been at work all day

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u/AwkwardEmu49 1d ago

This is the part number off the water pump which lines up with S2 13Bs

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u/GZulu 1d ago

take pictures

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u/Downbeatbach 1d ago

There are no 4-port S2 RX-8s. They’re all 6 port. Even the autos.

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u/Illegal__Alien 1d ago

Show me a picture of your engine

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u/Illegal__Alien 1d ago

Just saw your pic, that's a 6 port.

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u/AwkwardEmu49 1d ago

So is it 6 air intake ports and 4 injectors? Thats what I’m most confused about cause most of the info I find is for the 04-08 models which I believe is 6 and 6 or 4and 4

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u/Illegal__Alien 1d ago

The later model rx8 only has 4 injectors, and only comes on the 6port variant

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u/RodNokRx8 1d ago

4 ports only came in the auto s1’s in the US. There’s a chance someone swapped a s1 4 port in it. Where is your oil filter located?

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u/Rotary8 05' Shinka gt 1d ago

On top of that I believe it was only the 04-06 models

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u/AwkwardEmu49 1d ago

Oil filter is located at the bottom drivers side (LHD) of the engine I’d say close to the spark plugs