Re: [Amc-list] Pearly Whites

[Frank Swygert <farna@xxxxxxx>]

I've always heard the 2.8 described as a Chevy engine also -- no relation to the Buick 3800. 

Andrew Hay wrote:
given the lead time to develop and tool up the 4.0, it must've been
under way long before mopar stepped in.  if it hadn't, we'd probably
have gotten the dakota 3.9 instead.

I don't know where that comment came from! The 4.0L is an obvious derivative of the AMC 4.2L I-6 (258) and AMC 2.5L I-4. The block was derived from the 4.2L, supposedly the proto was a big bore Mexican block w/232 crank. The slightly larger bore/shorter stroke combo made it easier to pass some emissions without a lot of costs involved. The EFI obviously came from then "partner" Renault -- Renix EFI was used on other Renault models. The original 4.0L head is a lengthened 2.5L head. The 2.5L received a new chamber/port design when it came out. 

Chrysler did further develop the system. The HO electronics are a natural progression of the Renix system. The two are very similar, of course the later is more advanced. They also raised the ports on the HO head and improved the intake in 99, as well as made other slight improvements over the years -- all a natural course that AMC may have taken had the company survived. 

-- 
Frank Swygert
Publisher, "American Motors Cars" 
Magazine (AMC)
For all AMC enthusiasts
http://farna.home.att.net/AMC.html
(free download available!)

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