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Old 04-04-2005, 06:35 PM   #1
02focusfan
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focus zx3 vs. svt

hi my name is jonathan and i want to know what are the differences between the zx3 and the svt zx3 engine wise?


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Old 04-04-2005, 06:39 PM   #2
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6speed tranny on the svt...

the svt is pretty much just a suped up zetec engine with all the goodies..i mean yea its got different compression n exhaust n stuff like that but its still a 2.0..it might run a second faster than you but you can get more outa the zetec. ooh did i just say that heh ( only cuz more is out for the zetec) different final gear ratio as well...OH and theres variable intake cam timing.
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Old 04-04-2005, 06:41 PM   #3
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there are a bunth of threads talking about this and i am sure if you search you will find a bunch of information about how the zx3 and the svt vary. but a few of the differances are higher compression, variable intake, and different internals
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Old 04-04-2005, 07:01 PM   #4
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You might wanna try Googling to find one of the bazillion reviews that magazines/websites wrote about the SVT Focus, where they usually would describe in detail exactly what you're asking...
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Old 04-04-2005, 07:08 PM   #5
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This could get nasty. Hopefully it doesn't. If you are hoping to get your ZX3 to be like an SVT...stop trying. Go one step further and cutstomize your ZX3 to be a tuner car. Some parts from the SVT are excellent to use though (especially the suspension). All this can be found out by searching though.
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Old 04-04-2005, 07:52 PM   #6
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Moving to “SVT Owners Lounge”....
A quick search netted these threads:
SVT or ZX3
SVTF Vs. Non SVTF
SVT exclusivity
SVT or ZX3
svt versus zx3

As far as the SVTF engine:
1) Stronger (high nodular content) crank.
2) Forged steel connecting rods with 20mm wrist pins.
3) 10.2 compression ratio.
4) Variable cam timing on the intake cam.
5) Dual stage intake manifold. (long runners for low rpm, and short runners for high rpm)
6) Larger intake ports and valves.
7) Stiffer valve springs.

Oh, and.....
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Old 04-04-2005, 08:00 PM   #7
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Alright jeez I'll just do the legwork myself like WD40 did...

From here: http://www.sportcompactcarweb.com/ro...2scc_svtfocus/

Engine
According to SVT, its Focus 2.0 Zetec engine is the most technologically advanced engine it has ever produced. Working with Cosworth, accomplished wizards of small-displacement, high-horsepower engines from years of rally, F1 and general racing experience, SVT has given the 2.0-liter a fat, useable powerband.

SVT uses VCT, or variable cam timing, on the intake cam and a dual-stage intake manifold to greatly increase torque at low rpm. Below 6000 rpm, the intake charge is directed through the longest runner length possible. Above 6000 rpm, the lower half of the runners pivot, giving the charge an almost direct shot into the intake ports. The ZX3 exhaust manifold features a close-coupled cat, which is effective in attaining low emissions figures, but chokes performance. SVT placed both converters under the car, allowing for a tuned 4-2-1 stainless-steel header.

Under stress, ZX3 connecting rods are known to shatter like plastic champagne glasses, which is why they were replaced with forged steel units. Lightweight, cast-aluminum pistons bump compression from 9.6:1 to 10.2:1. SVT used a completely new casting with noticeably larger intake ports. Intake valves are 1.5mm larger than those in a standard Zetec. Intake and exhaust springs were made stiffer by 27 and 19 percent respectively, allowing the SVT valvetrain to safely spin to 7200 rpm rather than the standard 6750. All of the engineers' efforts are worth an increase of 40 hp and 10 lb-ft of torque.

Exclusive to the SVT Focus is a dual-mass flywheel, which is divided into two sections, one bolted to the crank and the second to the pressure plate. A dual mass flywheel might do wonders for NVH and in controlling driveline lash, but its heavier weight makes throttle response a bit muted. Drag racers will also have a beef with this mechanism because it denies quick shifting. It makes for very smooth engagement when operated normally, but row it hard and clutch engagement is jerky.
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Old 04-05-2005, 10:17 AM   #8
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SVT FO' LIFE!

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Old 04-05-2005, 08:03 PM   #9
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You get a certificate.. and "respect... to some people thats more important"
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Old 04-06-2005, 01:59 PM   #10
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SVTF engine also has oil jets that spray onto the bottoms of the pistons to cool them. And it's not strictly speaking the engine, but it has a larger diameter exhaust, too. Fuel pump I know is different, with higher capacity.

And the entire ECU setup is different.
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