STOCK F20C2 Snapped a Conrod?! Friend's Car - Need Help
11-28-2018, 01:33 AM
#21
Thread Starter
Piston top doesn't show any obvious signs of detonation which could be caused by running lower octane fuel, but check the other pistons as well to make sure.
Some pictures to show how it might look https://www.google.com/search?q=pist...w=1599&bih=824
Lugging the engine (driving constantly in to high gear) is really bad and this might be something an inexperienced driver could have been doing.
Seem a bit far stretched to cause this kind of massive failure though but who knows?
Some pictures to show how it might look https://www.google.com/search?q=pist...w=1599&bih=824
Lugging the engine (driving constantly in to high gear) is really bad and this might be something an inexperienced driver could have been doing.
Seem a bit far stretched to cause this kind of massive failure though but who knows?
Regarding driving style, lugging the engine and so on, I asked him about that now. This is still a mystery...
11-28-2018, 12:30 PM
#22
Given the clean history of the car, I don't really buy the one-tank-of-93-RON theory. The car has a ton of knock sensors and limiters, it would survive one 1/4 mi pass.
I'm wondering about the Liqui Moly 10W40 oil, though. Has he used it since the car was new? What's the moly concentration? Is it possible that 95K miles of high-moly 40-weight oil created just enough of a sludge/flow problem to seize a cylinder?
Frankly all of these theories are a bit thin. It's sounding more and more like a hard-luck (random) failure. 112K S2000s made = 450K rods, pistons and liners, some of them had to be the "weakest" (even if that means lasting "only" 12 years and 95K miles).
I'm wondering about the Liqui Moly 10W40 oil, though. Has he used it since the car was new? What's the moly concentration? Is it possible that 95K miles of high-moly 40-weight oil created just enough of a sludge/flow problem to seize a cylinder?
Frankly all of these theories are a bit thin. It's sounding more and more like a hard-luck (random) failure. 112K S2000s made = 450K rods, pistons and liners, some of them had to be the "weakest" (even if that means lasting "only" 12 years and 95K miles).
11-28-2018, 07:38 PM
#23
Thread Starter
Given the clean history of the car, I don't really buy the one-tank-of-93-RON theory. The car has a ton of knock sensors and limiters, it would survive one 1/4 mi pass.
I'm wondering about the Liqui Moly 10W40 oil, though. Has he used it since the car was new? What's the moly concentration? Is it possible that 95K miles of high-moly 40-weight oil created just enough of a sludge/flow problem to seize a cylinder?
Frankly all of these theories are a bit thin. It's sounding more and more like a hard-luck (random) failure. 112K S2000s made = 450K rods, pistons and liners, some of them had to be the "weakest" (even if that means lasting "only" 12 years and 95K miles).
I'm wondering about the Liqui Moly 10W40 oil, though. Has he used it since the car was new? What's the moly concentration? Is it possible that 95K miles of high-moly 40-weight oil created just enough of a sludge/flow problem to seize a cylinder?
Frankly all of these theories are a bit thin. It's sounding more and more like a hard-luck (random) failure. 112K S2000s made = 450K rods, pistons and liners, some of them had to be the "weakest" (even if that means lasting "only" 12 years and 95K miles).
It may very well have been the tipping point in this scenario.
I hear you - lots of F20's have been made over 10 years however, could any single part of those finely built engines in dedicated factories with dedicated staff really have been 'defective'? Trying not to be sentimental here lol but it is HONDA who is renowned for engineering so the likelihood of compromised engines leaving their factory is unlikely, especially for their top model. Another friend in our group lost his first engine to overfueling - running too rich due to a bad tune on a piggyback ECU. A rod only snapped 3 years later...... I suppose anything is possible since no one, including the Honda engineers is perfect...maybe it is just a hard luck random failure in his case. He's sourcing another engine as we speak.
11-28-2018, 08:13 PM
#24
Aren't OEM Honda S2000 connecting rods forged carburized steel? I kinda doubt routine engine cycles caused the failure, seen in the photo. Would be nice to completely dismantle that engine and check the other cylinders for signs of problems.
11-28-2018, 11:33 PM
#25
Thread Starter
They sure are. All the more reason why "random failure" is highly unlikely... I'd be keen to inspect it too. I might be able to take a close look if he has the block at his home. Will arrange to visit sometime. This weekend I'm helping another friend with his NFR turbo S2K. It is spraying coolant in the engine bay for some reason...
Last edited by RolanTHUNDER; 11-28-2018 at 11:35 PM. Reason: typo
11-29-2018, 04:56 AM
#26
"It is spraying coolant in the engine bay for some reason..."
Cracked plastic overflow tank?
Cracked plastic overflow tank?
11-29-2018, 09:05 PM
#27
Thread Starter
Will go investigate tomorrow. He has severe heating issues to the point that the hood paint has peeled/discoloured... He runs a log type manifold without heat wrap so first order of business is to heat wrap that sucker... any other suggestions for this heating issue? (Mishimoto rad already installed)
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