Home
What's new
Latest activity
Authors
Store
Latest reviews
Search products
Forums
New posts
Search forums
What's new
New posts
New listings
New products
New profile posts
Latest activity
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
Cart
Cart
Loading…
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Search titles only
By:
Menu
Log in
Register
Navigation
Install the app
Install
More options
Change style
Contact us
Close Menu
Forums
Contour and Focus
SVT Contour
"Fully built" 3.0L Duratec V6? Anyone?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="DemonSVT" data-source="post: 1470408" data-attributes="member: 435"><p>The power gain verses cash outlay to stroke or bore the 3L is pointless.</p><p></p><p>If you had done your homework you would now the Duratec is an over square engine. The 3L especially so. This brings up the powerband to help the high winding DOHC engine architecture make power if a usable range for small displacement. </p><p>We are not talking about pushrod large displacement V8's. (Even a 5L is twice the displacement of the standard Duratec)</p><p></p><p>As for clearances and limits. </p><p></p><p>You disregard accurate information like you researched all the possibilities already. I you HAVE then why ask this question in the first place because you know it's cost per gain is pointless.</p><p></p><p>Since you obviously HAVE NOT done any research at all you should be learning and not telling people the limits they state are not accurate and you are skeptical of everything posted. ...no offense intended...</p><p></p><p></p><p>The Duratec has a cast in liner. You could push it to +1mm (90mm) but +.5mm is a safer overbore if you plan boost.</p><p></p><p>To replace the liner you would have to SLOWLY machine it out and then the block to accommodate a high strength press in sleeve.</p><p>Even then maximum bore size is about 93mm. Correct that's 4mm over stock and 3mm over max stock liner bore.</p><p></p><p>Cost outlay for this alone would be around $800-1000 for an extra ~170cc. (2970 vs 3240)</p><p>Then factor in "one off" custom pistons at $800-1000 and it gets even worse.</p><p></p><p>That's $11-12 per cc of increase. </p><p>A general rule of thumb is for every 20cc you get 1HP/TQ. (8HP/TQ at $230 per! :bash: )</p><p>However then factor in the extra weight of the pistons and the slower revability (i.e. work or HP) on an engine designed to rev and the gains diminish more. Maybe $250 per..</p><p></p><p></p><p>Now let's talk stroke. </p><p>Custom "one off" crank and it can't be cast. $$$$$$$$</p><p>Stroking the engine severely limits RPM range of an engine designed to rev and make power in the 4000-7500rpm range.</p><p>Custom rods ($1200-1500 a set)</p><p></p><p>The starting clearance is hundredths meaning you will need shorter rods and that means a lot of R&D work ($$$$)</p><p></p><p>I could see spending 5 grand just stroking the engine. Maybe more probably not much less.</p><p></p><p>You could get about 3500cc's from a 93mm bore and maximum stroke. Hence the whole 3.5L idea that's been floating around for a lot of years now. (That size wasn't just pulled out of a hat ;-) )</p><p></p><p>So maybe another 260cc's from 5 grand or $300-350 per</p><p></p><p>However your rpm range drops and HP is a derivative of TQ and RPM so your actually numbers would drop because you could not achieve the same peak rpm numbers. More like a definite $350 per...</p><p></p><p>For the metrically intolerant old schoolers that's 212ci (3.5L) vs 182ci (3L) or a whoppin' 30ci increase.</p><p></p><p></p><p>So if you had done your homework... (This topic has come up several times in detail on both CEG & NECO) </p><p></p><p></p><p>The morale of the story is for uniqueness it would be cool but for common sense it's pointless.</p><p></p><p>A Supercharger (with IC & shaft bearing upgrades) is about 5k. (4000-7500rpm setup)</p><p>The full ADC turbo kit is about 5k. (3000-6500rpm setup)</p><p></p><p>Both will make more power then a 3.5L engine and do it for about half the cost. Comparatively maybe less than that even.</p></blockquote><p></p>
[QUOTE="DemonSVT, post: 1470408, member: 435"] The power gain verses cash outlay to stroke or bore the 3L is pointless. If you had done your homework you would now the Duratec is an over square engine. The 3L especially so. This brings up the powerband to help the high winding DOHC engine architecture make power if a usable range for small displacement. We are not talking about pushrod large displacement V8's. (Even a 5L is twice the displacement of the standard Duratec) As for clearances and limits. You disregard accurate information like you researched all the possibilities already. I you HAVE then why ask this question in the first place because you know it's cost per gain is pointless. Since you obviously HAVE NOT done any research at all you should be learning and not telling people the limits they state are not accurate and you are skeptical of everything posted. ...no offense intended... The Duratec has a cast in liner. You could push it to +1mm (90mm) but +.5mm is a safer overbore if you plan boost. To replace the liner you would have to SLOWLY machine it out and then the block to accommodate a high strength press in sleeve. Even then maximum bore size is about 93mm. Correct that's 4mm over stock and 3mm over max stock liner bore. Cost outlay for this alone would be around $800-1000 for an extra ~170cc. (2970 vs 3240) Then factor in "one off" custom pistons at $800-1000 and it gets even worse. That's $11-12 per cc of increase. A general rule of thumb is for every 20cc you get 1HP/TQ. (8HP/TQ at $230 per! :bash: ) However then factor in the extra weight of the pistons and the slower revability (i.e. work or HP) on an engine designed to rev and the gains diminish more. Maybe $250 per.. Now let's talk stroke. Custom "one off" crank and it can't be cast. $$$$$$$$ Stroking the engine severely limits RPM range of an engine designed to rev and make power in the 4000-7500rpm range. Custom rods ($1200-1500 a set) The starting clearance is hundredths meaning you will need shorter rods and that means a lot of R&D work ($$$$) I could see spending 5 grand just stroking the engine. Maybe more probably not much less. You could get about 3500cc's from a 93mm bore and maximum stroke. Hence the whole 3.5L idea that's been floating around for a lot of years now. (That size wasn't just pulled out of a hat ;-) ) So maybe another 260cc's from 5 grand or $300-350 per However your rpm range drops and HP is a derivative of TQ and RPM so your actually numbers would drop because you could not achieve the same peak rpm numbers. More like a definite $350 per... For the metrically intolerant old schoolers that's 212ci (3.5L) vs 182ci (3L) or a whoppin' 30ci increase. So if you had done your homework... (This topic has come up several times in detail on both CEG & NECO) The morale of the story is for uniqueness it would be cool but for common sense it's pointless. A Supercharger (with IC & shaft bearing upgrades) is about 5k. (4000-7500rpm setup) The full ADC turbo kit is about 5k. (3000-6500rpm setup) Both will make more power then a 3.5L engine and do it for about half the cost. Comparatively maybe less than that even. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Contour and Focus
SVT Contour
"Fully built" 3.0L Duratec V6? Anyone?
Top