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Joined: Jan 2001
Posts: 13
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OP
Junior Member
Joined: Jan 2001
Posts: 13 |
Are they the same motor? If they are, as a simple mod, as the V8 folks do, Could a crank shaft and maybe if needed rods from a 3L be installed in a SVT 2.5? If so, that would seem to be a cheaper easier mod than an entire engine change.
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Joined: Jan 2001
Posts: 13
Junior Member
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OP
Junior Member
Joined: Jan 2001
Posts: 13 |
Never mind about the crank. It occured to after I posted this that an upstroke maybe included in the 4 stroke process and there may also be something above the cylinder bore.
DUH
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Joined: Jun 2000
Posts: 3,562
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Posts: 3,562 |
The cranks/rods are the same size. The extra .5 of a liter comes from a bigger bore on the 3 liter, so a crank and/or rod swap would still leave you with a 2.5L engine.  BTW, engine specs should be searchable in this section of the forums if you'd like to know more.
Brad Noon '99 SE MTX 3 point oh my God H.O. 179HP/178TQ BNMotorsports Floormats, powder coating, TB optimizing, Gutted cats, etc BNMotorsports is now the preferred distributor of Contour/SVT/Mystique Indiglo style gauges!!!bnmotorsports@msn.com
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Joined: Jan 2002
Posts: 81
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Posts: 81 |
The cranks come from the same forging but more mass is removed for a 2.5L crank during balancing due to the smaller (i.e. lighter) 2.5L piston & rod assembly. I suppose a crank shop could add weight to return the 2.5L crank to the 3.0L specification. Adding weight is always a risky thing to do though. If it ever comes loose, there will be hell to pay.
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Joined: Jun 2000
Posts: 3,248
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Joined: Jun 2000
Posts: 3,248 |
The cranks come from the same forging but more mass is removed for a 2.5L crank during balancing due to the smaller (i.e. lighter) 2.5L piston & rod assembly. Good tidbit Procyon. Did the weight loss in the 2.5L cost strength or is it more from the loss of counterweight size. also, I have read that they share rods ..true?
1999 Amazon Green SVT Contour (#554/2760)
Stock SVT Duratec V6 with:
Intake- K&N filter/75mm MAF meter
Exhaust- MSDS Y-pipe/Bassani catback
Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter
179.2 FWHP at 6900 RPM
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Joined: Jan 2002
Posts: 81
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Posts: 81 |
There is extra drilling done on the 2.5L crank counterweights during balancing. Nothing major. No effect on strength or durability.
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Joined: Sep 2000
Posts: 5,805
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Posts: 5,805 |
2.5 crank is weak to start with...... 
V6 MTX
'Don't p**s up my back then tell me it's raining!!!"
'Its only nuts & bolts!'
'If I build it,fix it,upgrade it or modify it...MAYBE they will come....!
Haines Motor Sports Inc,
Dealer for 'Quaife America' & 'Autotech Sport Tuning'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
Get a Turbo for you Zetec from HMS Inc...by 'The Demon' ...www.DemonDynamics.co.uk
..don't talk about it DO IT !!!
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Joined: Jun 2000
Posts: 3,248
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Joined: Jun 2000
Posts: 3,248 |
2.5 crank is weak to start with......
Well given that the stock damper is very suboptimal and lots of bending/"whip" is occuring to fatigue the metal it is not surprising that it would seem so. But how weak is it really? It is a forged from billet steel.. I would think with a DMD it should hold up well. I have not heard of crank failures just spun bearings?? Several of the S/C cars are making near 350 HP for 10,000 miles, Dutweiller's turbo was 450 HP, in the article he said it looked like a pretty stout piece..?? 
1999 Amazon Green SVT Contour (#554/2760)
Stock SVT Duratec V6 with:
Intake- K&N filter/75mm MAF meter
Exhaust- MSDS Y-pipe/Bassani catback
Durability-Ford "dual mode" damper, Mobil 1/K&N oil filter
179.2 FWHP at 6900 RPM
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Joined: Sep 2000
Posts: 7,329
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Joined: Sep 2000
Posts: 7,329 |
Originally posted by Terry Haines: 2.5 crank is weak to start with...... Compared to what? Personally a stock (Factory) V6 crank holding 450HP or spinning 8000+ rpm sounds fairly strong IMO.
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Joined: Mar 2001
Posts: 1,041
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Joined: Mar 2001
Posts: 1,041 |
So is the DMD the only part to help eliminate a weak crank? What else could be done to beef up this part?
Silver 98 SVT Contour E0 #4124 (Currently on Life Support) Built 11/97 Bought 1/98 Eibach Pro Kit \ Koni \ Niche Pultec 17"x7.5 \ Yokohama Parada 215/17/40 \ Shaved Wheel wells / Brembo-KVR Cross Drilled Rotors / KVR Carbon Fibre Brake Pads / Aeroquip SS Brake Lines \ 21mm Rear Progress Tech. (Powder Coated Black) \ Superchips Auto Meter Pro Shift Light \ Extrude Honed \ Stripped Resonater Street Scene Free Flow Exhaust \ Injen Technology Prototype CAI \ Weapon R filter \ Hose Techniques Red Kit \ Folia Tec Red Caliper Paint \ MOMO (shift knob, pedals, seat belt pads) \ Clarion, Sounstream, Kicker \ Optima Red Top Battery \ SVT Emblem Mods Jet Hot Coatings (25-30% Cooler) on Upper Intake Manifold, Sho Shop Y-Pipe, Cat, and CAI "Come Out...Come Out Where Ever You Are" http://www.geocities.com/speeddemons19
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