I had a friend selling his cobra with 140k miles on it, so we did a compression test. Here are the results
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I had a friend selling his cobra with 140k miles on it, so we did a compression test. Here are the results
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That was a awesome demonstration of a compression test. What is actually perfect compression 170 or 180? If so, it didn’t loose that much over 14/15 year span.
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First time seeing something like this done. What happens when it fails a compression test? What needs to be done?
Could be a multitude of things. I've run a cylinder leakdown test previously when I detected lower compression on a cylinder or two to help identify where the problem is. But bottom line, you're most likely going to be tearing into the motor if you have low compression in order to remediate it.
First time seeing something like this done. What happens when it fails a compression test? What needs to be done?
I ran into a guy in LA that had a compound setup on stock short block with e85 and well past 150k on the clock, said he's never had a problem with it. They hold up pretty good and were well designed factory with good tolerances and really good hardware for the time, what more would you expect. I tore into an LSA crate with a friend of mine put in a s14 he built for drifting a couple years back and it didn't even hold up by the time he sold it for another project. Ford did it right.
I’m convinced if the engine is well fed they are very durable. Most failures I see are from detonation or melting a piston from a lean condition and everyone blames the pistons lol
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wow..
no comment on video..
at 419k..
I'm seeing 180 to 195 psi..
6,7,8 have been reading this since replacement head..
cyl 6 piston has hash marks from exhaust valves dropping..200k since last work..
passenger side head is still original 4 thread..
using Castro gtx with stp oil treatment since new..
sounds like a completely different story if you’ve had the engine apart.. what car, what compression ratio, what work to the heads, performed hot or cold, temp outside ...many factors can change results- you can’t get caught up on specific psi. You need to pay attention to percentage drop among all cylinders.
The main thing here is the car was running consistent. with 8.5:1 CR you shouldn’t be seeing such high numbers. You may have done something incorrect- maybe even sprayed fuel into the cylinders when cranking OR even adding oil to the cylinders can increase the results. Your heads may be leaking oil into the cylinders
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