What if you turned the car upside down?

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70 Plymouth Valiant 4dr

Interesting thought on the head first cooling thing, Lou.

When I re-clocked the cam at 100* recently, I wound up getting my best runs at 34* to 36* total advance. Prior was 28* to 30*.
Now I wonder if the head first cooling may've had a contribution as well.

Also seems to be taking a bit longer to warm up. Though that's only a subjective observation, as I didn't think to baseline it prior to the change, I hadn't considered that aspect.

I doubt warping'd be an issue, as the original temp variations weren't enough to cause it before.

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Sex, drags, and rock & roll.
Dick, 225% crazy.
Hobby (cars, that is) Photos link

It's a Slant 6. How do you think you can warp anything?

In our LeMons /6 racecar, one of the drivers had flipped the alt/pump belt and ran more than 1 full lap with no water in the engine. Blew the head gasket, but after replacing that it ran fine for that race and another race weekend. Burned almost all the paint off the head and everything...

Lou

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Home of Slant6-powered fun machines since 1988

Good to know, thanks Lou!

(I was expecting some jokes about warp speed, but in the heat of the summer...)

Olaf

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Aspenized

Every slant I have torn down has a deeper ridge on cylinder number one, suggesting it runs cooler, and thus wears more. It seems the cool water hits there first, and thus does make that metal cooler. This greater wear would bear out Lou's logic here. Reversing the flow would make the temp of 1-6 more even. I like the idea of a cooler head, but now is the combustion chamber of # 1 going to be cooler than number 6, and what would that do to fueling, atomization and flame travel. Just throwing out ideas?

Sam

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Thank you, Sam. That kind of spesific SL6 practical experience is exactly what I seek. General cooling technology is very interesting, but what happens in a modern press-formed alloy engine, with computer designed cooling systems, is very far from what happens in an old piece of cast iron like the SL6. I have made a list of pros and cons, and there are some unanswered questions whose answers usually comes from experience only. The number of SL6 engines is probably greater in the scrap yards than on the road nowadays, but over here they are hardly found at all anymore, most former SL6 cars and trucks are now powered by a V8, so I have no other slantsixers to consult.

Olaf

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Aspenized

Just pulled the head off an 83 truck slant last night. Wear is greatest on number one and gets less as you move back. By number four there is little wear at all. In fact wear on this engine is much less than expected, and it was free of sludge. I suspect the hotter thermostat required in 83 kept wear down, and sludge from forming. Valves look good with a slight brownish deposit, and little carbon. I would like to know more about it. What oil was used, change intervals, and what kind of driving?

Sam

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