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Joined: May 2000
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Judge- i thought you wanted more material up top for a forced induction engine to help disapate heat... it shouldn't be a problem on a n/a engine... infact that is the most cost effective way to lower compression on a n/a engine (if aftermarket iis small like it is for ours)... but for forced induction you want the material...
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Joined: Jun 2000
Posts: 2,794
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you do want more material, but if the extra material that creates the extra compression is a dome or "spiked" shape, then by removing it will not hurt. Those type pistons are usually alot thicker than their low comp twins. Therefore by removing the extra material, you will still have a thick crown.
Just call me Judge.
People suck.
Life begins at 170mph...until that point it is just boring.....
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Joined: Sep 2000
Posts: 1,861
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The displacement is slightly smaller on the 2000 engine. I don't know if the bore or stroke was reduced though because even though Ford says the displacemnt dropped from about 2.55 L to just barely under 2.5 L to meet European standards, the bore and stroke specs they published are the same as the older cars. I'm sure that the pistons are different, rather than head chamber volume, but again this is not published anywhere that I have found. Even if the pistons are what was changed for the higher compression, it still might not work on the older engines due to possible differences in bore diameter and possible difference in pin height if the stroke was changed. I wiah that Ford did a better job of providing specs like this. Originally posted by NYKnicksSVT:
Did Ford change the pistons in the 2000 SVT to acheive a higher compression ratio?
Jim Johnson
98 SVT
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Joined: Sep 2000
Posts: 7,329
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Bore & Stroke for a 2000 Duratech V6:
81.66mm x 79.5mm = 2499cc
The pistons are what changed for the higher CR in the SVT (If you believe the sell sheet they are forged alloy too?)
All pre-00 Duratechs:
2544cc (Don't have the bore/stroke specs handy)
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Joined: Sep 2000
Posts: 7,329
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Pre-00 2.5L Bore & Stroke:
82.4mm x 79.5mm
...Also the 00 Bore is technically 81 2/3mm
For Reference the 3L's specs:
89.4mm x 79.5mm (note the same stroke)
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Joined: Dec 2000
Posts: 34
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Just a quick note:
The Toyota 3-TC has very similar specs (bore, pin diameter) but the compression height is slightly taller (1.22 IIRC) . A slightly shorter rod would permit this piston to be used and open up a supply of pistons in MANY
compression ratios. Does anyone have the specs for the rods??
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Joined: Mar 2001
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Originally posted by Sandman333:
Wow, where did you get those figures? I have been searching for them for a while for a project that I am working on. The Compression distance is from the center of the pin, yes? What is the pin diameter? I'm not sure. I would call Ford Racing. (810) 468-1356 --Matt
00' SVT Contour, Black and Blue #954 of 2150
Stock....
2003 Red Fire Convertable Cobra due in September...
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Joined: Aug 2000
Posts: 165
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Originally posted by bret:
i would use 8.5:1 but make sure they don't just mill the top of the piston to lower the compression, that is bad for a s/c car... you want as much material up there as you can get to help with the high heat... i might be able to get you a set of 8.5:1 if you are interested... These would be for a 3.0L s/c engine right? How much for a set?
5 speed MTX /KKM Custom Intake /Dynomax Super Turbo /TH Fix /Audi A6 Sidemarkers / Badgeless /Audio:(JBL600.1 amp,Polk Dx Subs, Infinity 6953i 6x9's, Lightning Audio Strike Cap)
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