Car is running a steady 207°. I can't remember which thermostat I installed. I believe it was the one that came with the crate engine. Does this sound hot?? Any recommendations?
Because this is not a modern engine. It's an old fashioned American V8, using the same rings, bearings, push rods, carbs, and blocks that we used 20 years ago.I'm with Erik on this. That isnt too hot for a modern engine. Cant understand why everyone frets about the engine running at 200*. I bet you dont have a clue as the operating temp of your daily driver.
I never do. But I make sure I clean out the coolant passages before assembling the engine.am i supposed to drain the cooling system after breakin? How many miles? I did not know this!
Exactly.Because this is not a modern engine. It's an old fashioned American V8, using the same rings, bearings, push rods, carbs, and blocks that we used 20 years ago.
200* is not too hot. But it's hotter than it needs to be. By running the coolant that hot, you're also allowing the heads and coimbustion chambers to be hotter than they need to be.
IR carbs are not always that consistent, and they can occasionally run a little lean. If the combustion chambers are cool, that brief episode of lean mixture is no big deal. But if you're already over 200*.... now it's a big deal.
To run efficiently, you really don't want the engine much above 220* or so. If you're already at 207*, you have very little margin for error. How long do you have to sit in traffic to gain 20*?
I know exactly what the operating temp is on my DD.
I never do. But I make sure I clean out the coolant passages before assembling the engine.
Correct again.Go back and look at the specs for the "new" 427W from Ford. Sure, they use "modern" materials. But they're not that far off from a block or pair of heads from the 70's or 80's. Also, look at ring and bearing materials. Nothing all that much different than 10-15 years ago.
Rings, bearings, clearances tolerances, etc, all pretty much the same as they have been for the last 20 years. Pull out Pat Ganahl's or Tom Monroe's book (written in '79 and '80), and compare them to a book written in the last few years. Not much difference.
The other question you have to ask is why are modern EFI engines designed to run at 200*? Are they more efficient? Do they last longer? Get better fuel mileage? Make more power? No, none of those. It's simply to lower emissions.
Take a look at the new Corvette. If you want to get good power out of them, the first thing you do is change the thermostat and reprogram the computer to accept the lower operating temps.
Other data tells us that engines that run below 160* have accelerated cylinder wall wear.
Perfect operating temp for a gas engine is around 170-180*. That hasn't changed over the last few decades.