Liquid oil in the exhaust.... and other oddities

[MaxD]

Are you sure the engine didn't spin the wrong way as a result of the car spinning and then traveling backwards?

Something caused a lot of pressure to build up.

[maytag]

Originally Posted by MaxD

Are you sure the engine didn't spin the wrong way as a result of the car spinning and then traveling backwards?

Something caused a lot of pressure to build up.

No, I'm not certain. The car died when I spun. That may be from what you describe. It happened pretty fast, as it was precipitated by the oil left by our friend in the Ford. :: sigh::
Don't get me wrong.... I blame only myself for the spin, but the conditions leading to it have to be acknowledged too, haha.

So, if the motor spun backwards, what's the biggest fear here?




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[JFP in PA]

Originally Posted by maytag

So, if the motor spun backwards, what's the biggest fear here?

Bent valves....

[maytag]

Originally Posted by JFP in PA

Bent valves....

Right, but that's assuming cam timing changed, which could've happened forward or backward, yeah? (Or is there another way to bend those valves that I'm not considering? )
But I'm still pushing healthy compression numbers in all cylinders.

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[MaxD]

You may have escaped damage - I'm just postulating what blew out the plugs...

In the end this was an atypical AOS failure. We have all seen smoke, exhaust oil fire not so much.

[maytag]

Originally Posted by JFP in PA

Rotating the engine in reverse, even by hand, is sufficient to whack the valves; we have had people bring us cars that they had done exactly that while attempting an IMS retrofit, and even though the cams were still in time, they had kinked a couple of valves and every piston had bark marks from contact.

!!!??!!!

I believe you, JFP, because I have no experience otherwise. But I'm struggling to wrap my head around the HOW.

The location of the cam (and therefore the entire valvetrain) is fixed, in relationship to the crank (and therefore the pistons). I'm trying to imagine how direction of rotation can affect this? Teach me.

Originally Posted by MaxD

In the end this was an atypical AOS failure. We have all seen smoke, exhaust oil fire not so much.

Hahahaha.... I'm rarely "typical" in anything, Max. Surely you've understood that about me by now, haha.

[JFP in PA]

Originally Posted by maytag

Right, but that's assuming cam timing changed, which could've happened forward or backward, yeah? (Or is there another way to bend those valves that I'm not considering? )
But I'm still pushing healthy compression numbers in all cylinders.

Sent from my SM-G930T using Tapatalk

Rotating the engine in reverse, even by hand, is sufficient to whack the valves; we have had people bring us cars that they had done exactly that while attempting an IMS retrofit, and even though the cams were still in time, they had kinked a couple of valves and every piston had bark marks from contact.

[MaxD]

Originally Posted by JFP in PA

they had kinked a couple of valves and every piston had bark marks from contact.

I think it's time to break the borescope out.

[maytag]

Originally Posted by MaxD

I think it's time to break the borescope out.

yup...on it tonight.
BUT: a bent valve isn't consistent with good compression numbers. Jus' sayin'.