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Discussion Starter · #1 ·
Okay this question involves swapping cylinder heads on a 1.9 Escort.
Which heads will bolt up to the 1.9 block? I know from reading the forum that the 2.0 SPI head will fit, but are there any other higher flowing heads that will work? Some1 told me a while back that a focus head would work, not sure if it was a zetec or an SPI. I'm assuming thats false. The reason i'm asking is because i recently had a bunch of work done to my car, such as complete pacesetter exhaust and a weapon-r intake (junk), and i've got the speed bug bad. I want to step the performance up a notch but don't want to to go turbo, and a 2.0 SPI swap is out of the question right now. The pony is the only car i have and i can't afford the day or two (or more) of downtime that swap would require. I'm leaning towards gettin an SPI head and intake and getting some serious porting done to the head. Would the SPI head raise my compression? if so what would it be? I know i'd hafta rig up an RPM switch to open the butterflies in the intake, that doesn't seem to be a big deal. Any info or suggestions you guys can give me would be greatly appreciated. Thanx in advance.

PS Another option i was throwing around. I replaced the plugs and wires a lil less than a year ago as an added bonus to the blown valve cover gasket. Would performance plugs (NGK Iridium?), some Magnecor wires and an MSD coilpak make that big of a difference?
 

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The SPI drops your compression hard core because the pistions in the 1.9 are flat, and the spi's are domed. Secondly, the SPI has a bigger combustion chanber, lowering the CR even more.

Port your stock head and intake, mabye an HO cam. Mabye shave the head. Honestly, to have head work done, the head is going to be off at least as long as it would take to do the SPI swap.

Get an SPI. Port it, Polish it, get the SPI shorty header, and when you have the time. Toss her in. You'll be alot further along.
 

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Discussion Starter · #3 ·
Josh, your advice sounds extremely logical and definitely made me realize that headwork will most certainly be a good deal of downtime. The SPI swap i've decided will be the next major mod. You mentioned using an SPI shorty header. I have a Pacsetter header on my 1.9 right now, will that bolt right back on the SPI? I'd like to keep the same exhaust set-up if at all possible. Thanx again.
 

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Discussion Starter · #4 ·
Oh and does anyone have any feedback on changing to the plugs, wires and coilpak that i mentioned in the first post? If it will really make a difference as far as power or just overall performance I'll go ahead and order the parts. If i can stick with the stock stuff i'd save a good bit of cash. Let me know what you think guys.
 

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No need to order those igntion parts just yet. Even if you did spend $80 on a nice coil pack, $50 on name brand wires and $25 fancy smacy plug's, the power you gain will be so small a dyno will hardy beable to measure the differance compared to good condition OEM stock parts.

The SPI swap is the best bang for the buck. And like said, just swap the entire motor. It's not really that much more work to swap the entire motor instead of just a head.

The exshaust side of the 1.9 and 2.0 SPI head's have the same manifold mounting. So if it works for one it will work for the other. Just note that the cat's are not the same from 2G to 3G.
 

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Discussion Starter · #6 ·
Thanx Jeff for the advice on the ignition parts, you've saved me some doe thats for sure. I'll definitely be hitting you up for some detailed swap info later on whenever i have the doe and time to swap in the SPI. I was wondering though how all of the sensors on the 1.9 are compatable with the SPI. Forgive me if i'm wrong, but aren't the SPI motors based off of the OBDII system, which would throw an extra O2 sensor in there after the cat as well as a much more complicated PCM. I did read somewhere on here that the TPS sensor from the SPI needs to be wired in to the 1.9 Harness. What other issues are there with the sensors that i should be aware of? I'd really appreciate any info you guys can give me. Thanx alot guys.
 

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youre overthinking this swap.. its really much much easier than you think. let me explain some.

you use the entire 1.9 wiring harness and computer. almost all of the sensors are the same from the 1.9 to the 2.0, so minimal swappage of parts is necessary (as if its hard to do).

you DO need to use the 2.0 mass air flow sensor however due to the larger injectors in the SPI. wiring the SPI tps into the 1.9 harness is no biggie.. just cut the wires, and crimp them onto the 1.9 harness.

ask jeff for details. ive done this swap 3 times, he's done it at least that many times plus one or two.
 

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PonyExpress said:
you DO need to use the 2.0 mass air flow sensor however due to the larger injectors in the SPI.
According to Jeff's swap page the 1.9/2.0 injectors are exactly the same except for physical size. He also says to reuse the 1.9 MAF. I have heard other people saying to use the 2.0 MAF as well, but I have a 94 MAF and ECU on mine and it seems OK. I didn't think a 2.0 OBD2 MAF would work with an OBD1 1.9 ECU.
 

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Discussion Starter · #9 ·
Thanx guys for clearing up the difficulty of the SPI swap for me. Greatly appreciated. It seems to me that whenever i do get the SPI motor in my posession, it shouldn't take long to drop it in and button everything up. I'll definitely take a look at Mike and Jeffs websites and study them further. I do trust Mikes statement that you CAN reuse the 1.9 MAF, but it would be nice to have cold hard proof that the 2.0 and 1.9 injectors are in fact the same flow rating. The fact that the 2.0 injectors are physically smaller is proven in the pictures on Jeffs website. I've read in the past something like the 1.9 has 15lb injectors and the 2.0 has 19lb injectors. Does anybody know the truth on the flow rate of these babies?
 

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im almost 100% postive they are not the same flowrates.. and that being the case, you would be really messing up the fuel delivery by using a MAf sensor calibrated for injectors that flow 4lbs less than what you really have.

it'll run with the 1.9 maf, but many ppl, have publically expressed having issues with doing that. try it with the 1.9 maf, see if it works, if so, there ya go.
 

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When I first made the SPI swap how to, no one really knew what size the 1.9 injectors were, first evey one said they were all 19lb's, then 15lbs. I have even heard that some Zetec's have 19lbs were others have 16lb's.

My first SPI swap was to my 96lx, that is OBD2. I kept the 1.9 MAF and used the 2.0 injectors, it runs fine and has for over a year now. Maybe the injector size got bumped up with the OBD2 change, or maybe the computer can compinsate for the small change in injector size.

But it does make sence to keep 1.9 injectors and 1.9 MAF with each other or 2.0 injectors with a 2.0 MAF.
 

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Discussion Starter · #12 ·
Thanx to PonyExpress and Jeff for once again clearing things up.

Jeff,

That being said, are the connectors for the 2.0 MAF and the 1.9 MAF the same? I'm not sure but i think they're both 4-wire MAF sensors. Will the 2.0 MAF just plug into the old harness, or is splicing required?
 

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ScortDude91Pony said:
Thanx to PonyExpress and Jeff for once again clearing things up.

Jeff,

That being said, are the connectors for the 2.0 MAF and the 1.9 MAF the same? I'm not sure but i think they're both 4-wire MAF sensors. Will the 2.0 MAF just plug into the old harness, or is splicing required?
The OBD2 MAF's are 6 wire plug's, they have the IAT sensor built into the MAF. The 96 MAF has a 6 wire plug, but the IAT sensor is still seperate.
I think you will have to remove your MAF sensor it's self from the housing and put it in the 2.0 MAF housing, the sample tube should be a different size to change to the 2.0 values.
 

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Well I got lucky and found the MAF off a '97 tracer today. It has a 6 wire plug, but only four contacts on the sensor. It had a seperate IAT which I also grabbed. The sampling holes doesn't look any bigger than on the '94 MAF I have. I'll need to compare it for sure tomorrow when I take the '94 one off the my car. I took a pic comparing the 3 different styles of MAF sensor plugs, just to see the differences. Also I threw in a pic comparing the '97 MAF to my old-skool '91 MAF. Tomorrow I am going to see of the 97 MAF will work with my 94 ECU and 97 injectors.



 

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I've got a '91 Pony (still using it's computer) with a '02 SPI and a MAF from a '01 and it only has 4 wires (which I had to splice). I also heard that EsCoRtLoVeR said that he called Ford or something and they said the the SPI injectors are 19#. I'm using the '91 IAT sensor also.
 

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Well today I put the '97 MAF on and the car runs MUCH better. I compared the sampling hole to the '94 MAF I had and it looks like it may be about 1mm larger on the '97.
 

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No, I just soldered/spliced the 2.0 plug onto my harness and used the entire 2.0 housing and sensor. When I go to put my new intake on I will take a pic to try to compare the 2.0 and 1.9 housings.
 

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I'd think that it would be OK to use the 1.9 MAF with the 1.9 injectors, but that will require the fuel rail to be modified to hold the taller injector's. That's not all that bad, because that will need to be done anyways to run larger injectors in the future.

91sleeper, did you get that SPI controller hooked up yet?
 
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