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SPI Performance (2000-2004) The place to chat about any 2.0L Split Port Injection engine performance, tuning and exhaust related upgrades.

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Old 03-22-2005, 03:03 PM   #1
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What does SPI mean?

Hey, I'm new so I can ask this now
I did search & read & finally just have to ask..
What does Split Port mean in relation to all the other ff engine related terms that I do understand like Zetec 16 valve, svt, etc..
Thanks in advance (TIA)


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Old 03-22-2005, 03:08 PM   #2
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Something Puny Inside. LOL! It's actully Split port Injection.
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Old 03-22-2005, 03:32 PM   #3
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haha good one
this thing is huge compared to my last car, a 3 cyl Metro
now before you LOL, that car got me 58 mpg!
I see you're right down the road, I'm in Chesapeake

anyway, I'm still trying to figure out exactly whatsplit port means
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Old 03-22-2005, 05:58 PM   #4
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The SPI, or Split port, is a second set of runners in the intake tract. It is operated by the IMRC motor contrlooed by the computer. Normally, and up to 3k rpms, the Split port butterflies are closed, making torque. When the SPI engined Foci hit 3k rpms, the IMRC motor opens the Split Port butterflies.
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Old 03-22-2005, 06:18 PM   #5
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Thanks!!!
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Old 03-23-2005, 10:36 AM   #6
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hmph.. i never was aware of that buttefflying fact. So the SWAB makes the butter flies stay open longer right?
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Old 03-23-2005, 04:28 PM   #7
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The SWAB fully opens the butterflies and holds them open at all times. By the pic you can now see why you only rotate the linkage open 1/2way as opposed to fully rotating them.
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