Re: [Amc-list] Brief road trip...

[Tom Jennings <tomj@xxxxxxx>]

Matt Haas wrote:

> The factory A/C shrouds (at least the late 60's ones) are nothing 
> special. They're just a big hoop with four tabs for mounting bolts 
> (mount with the radiator bolts). They did get a 7 blade flex fan. I 
> would think it would be pretty easy to come up with a better shroud 
> design without much effort.

Yeah, they're conveniently hanging on the wall here :-) They're a PITA 
to install, so I plan on cutting them in half (top and bottom) and 
simple tabs to refasten the loops.

The flex fan I have is pretty good, moves a crapload of air (I think 
that's the technical term). But the plastic flex fan I put on the little 
Rambler I like better; quieter, and a lot less lethal. Neither car revs 
high so the steeper pitch is fine. I plan on doing a shroud AND plastic 
fan and likely a spacer to reduce the gap.

> I also took a look at radiators in my parts book and six cylinder 1967 
> Rebels did not get a three core radiator with A/C. In 1968, the Rebels 
> did get a three core radiator with A/C.

On passenger cars like mine, yeah, two rows is fine. My radiator is old 
(new in 1995) but the cooling system is in immaculate shape. THAT 
matters most!

> Newer vehicles are generally better for engine/tranny cooling. I was in 
> that area last July (I think it only got to 110 heading into Vegas at 
> night) and the coolant temp gauge in my 07 Ram moved one needle width 
> closer to hot than normal (the only other time it did that was crossing 
> the Rockies on I-70 -- I also had to turn the overdrive off for part of 
> that [it's a 5 speed and having it locked out of 5th worked the rest of 
> the time]). I had the A/C going and was towing my wagon at the time.

Yeah, that's pretty good! The 60's cars weren't big on that sort of thing!

> As far as timing goes, my 67 American with 199/auto (water cooled) likes 
> 10 BTDC and my 68 with a 232/stick likes 5 BTDC for best power. Both 
> will ping like crazy if the timing is off. Did the 70 232 have EGR? 

Nope no EGR, didn't have.

This motor's not been on gasoline since 1988, so I have to dial it all 
in all over. I switched carbs only the weekend before! I think it's 
about 4 - 5 btdc now. My real problems are high compression (9.5 or so) 
and I screwed up the squish space, I think, when I built it. Clearly not 
to seriously since it's run this way for 20 years, but it makes timing 
difficult. I will remedy that this summer/fall.


> What rear gear do you have in your car? A fairly low rear end gear (mid 
> 3's) will help when towing and not be too hateful on the highway.

BW auto, torque tube, 3.15 axle, 27" tires, 2300 rpm at 60mph, about 
right I think.
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