Valves, trailer towing, etc.

[John Hofstetter <hofs@domain.elided>]

>Subject: John H, 318 4V, really?
>
>John H,
>
>        Are you sure about the 5.2L 318 having 4 valves?  I really can't 
>imagine
>a non-OHC engine with 4 valves.  Maybe it is OHC?  There would be two cams 
>then.
> What's the skinny?  Maybe make a desmodromic V8 with 4 valve and like 87 
>separate rockers, to open and close each valve.  That means you'd only 
>need 236 
>feet of drive chain/belt for the assembly.
>
>
>     -Joel Brodsky

Joel, Steve S. and whomever is still interested in this thread

Quote from Sept. '96 Four Wheeler Magazine: "The V-8's OHV cast-iron 
block is fed by sequential fuel injection. That, and four valves per 
cylinder, help make the 318 a big winner when it comes to horsepower, 
pound for pound. The V-8's  220 rated horsepower might not sound like a 
lot for a 4000 pound vehicle, and the V-8 Grand Cherokee is not all that 
much faster than with the 4.0 liter Six. But there is a difference-versus 
the I-6, the payoff is in greater towing ability, and torque to burn 
around town."

In regard to something I was speculating about earlier, 4 Wheeler says, 
"..... power now comes on from 1200 to 3000 rpm."

In regard to Joel's doubts as to how this is mechanically accomplished, I 
don't know how they did it, and I asked a couple of the mechanics at the 
dealership, and never got an answer that really explained it to me. The 
new 4.7 engine is overhead cam, and how that works is a lot clearer to 
me. 

To you IHC'ers who don't give a damn about GC's, my apologies, but this 
all relates to an original IHC issue regarding trailer pulling and the 
differences between the 345 and 392. Besides that, Joel was challenging 
my veracity, or senility, or if I had been drinking, or something. 

Joel, I have always thought I had a pretty good vocabulary, but 
"desmodromic" is new to me. Whatever it is, I probably have it and will 
see the doctor about it next week. However, neither my regular dictionary 
nor my medical dictionary show that word. (g) Give me a definition and by 
next month, I'll be using it as if I had always known what it means.

John 


John Hofstetter  "Ol'Saline's Web Site" www.goldrush.com/~hofs
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