I have been reading through a lot of the previous threads comparing tourque and HP of the various manufacturers. Well being home sick gave me the oppertunity to look up the numbers so I figured I could share them with you. They are segmented by manufacturer and list engine size, peak HP at rpm and peak tourque @ rpm

Chevy
4.8 275@5200 285@4000
5.3 285@5200 325@4000
6.0 300@4400 360@4000
8.1 340@4200 455@3200

Dodge
4.7 240@4800 300@3200 this is a OHC engine
5.7 345@5400 375@4200

Ford
4.6 231@4750 293@3500 ohc 2v
5.4 300@5000 365@3750 ohc 3v with VVT
6.8 310@3300 425@3250 ohc 2v

There seemed to be some consternation by some how could the F150 outpull the Dodge Hemi when its numbers were not as good as the hemi. Well it has to do with the wonders of Variable Valve Timing(VVT). This allows the engineers to flatten the tourque curve out and is made possible by the valvetrain. There is no easy wat to do this in a pushrod engine. Some of the european companies that have been doing it longer and obviously can spend more on their engines actually will list their peak tourque as a range. As in peak tourque is available from 2800 to 5400 rpm.

Some others have questioned the performance of the ohc architecture vs. a pushrod. Well the top end performance is there. In Australia ford has 2 cars using 32 valve 5.4 normally aspirated engines with very impressive numbers. Not to mention the soon to be available 5.0 cammer engine you will be able to purchase from ford as an aftermarket item.

5.4 350@5250 370@4250 DOHC 4v
5.4 390@5500 385@4500 DOHC 4v
5.0 425@6700 370@4000 DOHC 4v

Some might look at this as ho-hum but hey it gave me something to do on a thursday afternoon.

 

OK this has been talked about extensively for the past week or so, and you have some facts wrong- Chevy's engines are up in power for 04- 4.8 285@5600, 295lb/ft@4000, 5.3 295@5200, 330lb/ft@4000, and the Dodge 4.7 is not a OHC engine its a pushrod.

 

"The 4.7 has a cast iron block and two cast aluminum cylinder heads with a single overhead camshaft per bank and two valves per cylinder. It displaces 4701 cm3 (287 cu in.). A relatively small bore of 3.66 inches (93 mm) helped reduce overall length of the engine, packaging it for the compact engine bay of the Grand Cherokee. The stroke is 3.4 inches (86.5 mm). "

i got that from WWW.allpar.com being that it is a dodge enthusiast web site I would asume them to be corect as for the update chevy numbers thanks for the info, so pardon me for not knowing the facts. Feel free to be critical of this post as well

 

No problem, anytime, it is a discussion board by the way. But check the Dodge site and Jeep site and you'll see its not an OHC.

 

Whoops sorry about that I was thinking about the 5.7, the 4.7 is a SOHC