...and new high flow cats on a 300C SRT-8 the other day. They are stock pieces ported. I was quite surprised though. Apparently it's only good for about 77 horses. I don't have any dyno curves or anything just info from the vendor. It was a 6.1L HEMI which, again, I am underwhelmed with. Both the 5.7L and the 6.1L HEMI engines are being outpeformed by engines with similar displacements from GM. I won't add Ford into that mix because their bruisers are drastically smaller (over 1.0L smaller in some cases) but they use forced induction to get there. But hey, ya can't argue with 450 horses from 4.6L of displacement AND it's street legal and will pass a sniffer test!
Anyhow, the car sounded good, ran hard too. I would just be expecting more for about $4500 in parts. That's an expensive 77 horses. A supercharger setup would probably run 500-1000 beans less and net more than 100 horses. I imagine though that a more aggressive cam would get better gains, probably over 100 ponies. That would have been alot more expensive though. Much more work in swapping the cam out.
BTW, the 5.7L HEMI is an overhead cam. The 6.1L HEMI is a cam in block (OHV). The 6.1L has shaft mounted rocker arms too. We got lots of pictures, as soon as I get them, I'll post a few for perusal.
Posted by: bl3wbyu
Ooh, cool...an OHV engine. For some reason, I like the whole idea of pushrods.
Posted by: DeckSetter
Quote:
Originally Posted by John
BTW, the 5.7L HEMI is an overhead cam. The 6.1L HEMI is a cam in block (OHV). The 6.1L has shaft mounted rocker arms too. We got lots of pictures, as soon as I get them, I'll post a few for perusal.
Straight from allpar.com:
"The 5.7, like its LA predecessors, has a cast iron cylinder block; however, it weighs less and is smaller than the 5.9. It was designed with a single in-block camshaft and only two valves per cylinder, resulting in very low production costs; development and production costs, in fact, are supposed to be less than the new 4.7 liter Mopar V8 which in turn was considerably cheaper to produce than the old LA 318."
Hemi is cam in block, 4.7 in my Dakota is overhead cam.
Don't know if allpar will let me remote link to the cutaway shot of a 5.7 but I'll try it...you can clearly see it's not an overhead cam. You can see the cam in the block, a little left of dead center in the picture.
apparently, theyre really undercammed. hotrod did roughly the same thing but added a nasty cam... and hit somewhere north of 500 Hp.
Posted by: John
There was an SRT version with OHC heads. I could have sworn I saw one. I know the regular HEMI is pushrod. Was it the SRT-8 Dodge Magnum that had OHC heads? Unless it was a show car with a one off. It had overhead cams with 5.7L HEMI on an engine cover.
Posted by: DeckSetter
Quote:
Originally Posted by John
There was an SRT version with OHC heads. I could have sworn I saw one. I know the regular HEMI is pushrod. Was it the SRT-8 Dodge Magnum that had OHC heads? Unless it was a show car with a one off. It had overhead cams with 5.7L HEMI on an engine cover.
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hmmmmmmmm dunno, sounds interesting though. My 4.7 is SMOOTH. It's to smooth I'm almost a little surprised they didn't stick with that design for a larger engine. I'm averaging over 18mpg so far according to the trip computer, not bad for a heavy 4 door truck with 4 wheel drive!
Posted by: John
Dude, that's it? My blown 5.4L is getting 18 MPG. I would think a 4.7L engine would do better on fuel.
My favorite thing about the new HEMI is telling people who own a new HEMI that it's not a real HEMI!
That's just me I guess. Maybe it's all those years of hearing from ever Dodge geek out there about how Ford's "hemi" was only a "semi-hemi" and so on and so forth. Paybacks a bitch I guess.
Posted by: DeckSetter
Quote:
Originally Posted by John
Dude, that's it? My blown 5.4L is getting 18 MPG. I would think a 4.7L engine would do better on fuel.
My favorite thing about the new HEMI is telling people who own a new HEMI that it's not a real HEMI!
That's just me I guess. Maybe it's all those years of hearing from ever Dodge geek out there about how Ford's "hemi" was only a "semi-hemi" and so on and so forth. Paybacks a bitch I guess.
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You get 18mpg in the Lightning? Daaaaaaaang that's not bad at all! My truck is a heavy quad cab 4x4. Specs I find online say 4400-4500lbs. Also, the ground clearance probably kills me. If it was 2wd I'd probably be pulling 20.
