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Old 02-28-2013, 06:34 AM   #21
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Honestly you're not going to see any noticeable gain. You would be better off polishing the intake ports and running a better set of camshafts.
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Old 03-09-2013, 09:29 PM   #22
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Honestly you're not going to see any noticeable gain. You would be better off polishing the intake ports and running a better set of camshafts.
I'm with you on this head swap mod for N/A apps. Ford did not install a smaller port head on the 2.0L to make it inferior. It was done to better match the head flow to the cam, to optimize powerband, output and efficiency. The bigger head belongs on the 2.3 or on a 2.0 with cam swap to raise the powerband. It's wrong to assume that a head swap will lead to 2.3L powerband or similar peak horsepower. The 2.3L is about 15% larger displacement and this is what makes it about 15% more powerful. It's not the head flow doing it.
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Old 03-10-2013, 12:47 AM   #23
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I'm with you on this head swap mod for N/A apps. Ford did not install a smaller port head on the 2.0L to make it inferior. It was done to better match the head flow to the cam, to optimize powerband, output and efficiency. The bigger head belongs on the 2.3 or on a 2.0 with cam swap to raise the powerband. It's wrong to assume that a head swap will lead to 2.3L powerband or similar peak horsepower. The 2.3L is about 15% larger displacement and this is what makes it about 15% more powerful. It's not the head flow doing it.
Yes I agree w/ you. ^^^^^ I'd just throw a 23 on board. Mazda's MX-5 is a 20 w/ 170 hp. I'd bet they are using a 23 head. The head on the 20 foci has smaller ports for velosity= air flow, for the shorter stroke. Its not like a lot of regular joes are driving MX-5's.
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Old 03-11-2013, 09:14 PM   #24
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Yes I agree w/ you. ^^^^^ I'd just throw a 23 on board. Mazda's MX-5 is a 20 w/ 170 hp. I'd bet they are using a 23 head. The head on the 20 foci has smaller ports for velosity= air flow, for the shorter stroke. Its not like a lot of regular joes are driving MX-5's.
Yea the higher horsepower MX5 2.0 motor probably has higher flow heads mated to a more aggressive cam grind. This pushes the powerband upstairs and keeps it broad, instead of killing the bottom end with oversize ports and killing the top end with a wheezing cam profile.

IMO, big heads with stock cam is a total loser....just like a bigger cam mated to putzmobile econobox ports (optimized for low end).
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Old 03-12-2013, 01:44 AM   #25
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So correct me if I'm wrong, but the only way to take advantage of the 2.3 head swap would be to get a set of cams and a tune?
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Old 03-12-2013, 04:48 PM   #26
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So correct me if I'm wrong, but the only way to take advantage of the 2.3 head swap would be to get a set of cams and a tune?
If your installing a 23 head, I'd add a set of basic DD cams, a header & a tune. You'll have the head off anyhow, so whats a 1/2hr to swap cams?
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Old 03-12-2013, 05:30 PM   #27
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after reading all this it makes sense now. i just bought my obx header, typhoon cai, and the sct from tom. should be coming in this week or next :) i figure if i can find a 2.3 for cheap ill be able to buy cams in a month possibly, then im going to try this out. but by putting the 2.3 head its going to lower my compression?
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Old 03-13-2013, 12:02 PM   #28
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after reading all this it makes sense now. i just bought my obx header, typhoon cai, and the sct from tom. should be coming in this week or next :) i figure if i can find a 2.3 for cheap ill be able to buy cams in a month possibly, then im going to try this out. but by putting the 2.3 head its going to lower my compression?
So whats you going to do?
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Old 03-13-2013, 09:41 PM   #29
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So correct me if I'm wrong, but the only way to take advantage of the 2.3 head swap would be to get a set of cams and a tune?
Yes.

Bigger ports mated to small stock cam and small displacement will only serve to produce a narrower powerband than stock. The few extra horsepower you gain on the top end will be offset by horsepower losses in the middle. Power near the bottom end of the power curve will be seriously reduced. The net result will be no additional usable power under the curve; that is, it's a big waste of time and money. The car will feel more peaky (and perhaps more impressive to some) due to narrower powerband, but it will not be faster. You will have to row the shifter more precisely just to stay in the powerband. Who in the heck wants that? Not me.
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Old 03-13-2013, 10:48 PM   #30
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Simple answer= velocity, is your friend. in & out stuff.
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