Silber’s 2002 Boxster S Engine Build

[Silber]

You might be right, I don’t think it will hurt anything to make sure that the intake seals completely.

However, Something caused #2 to self destruct. The spark plug got so hot only on that cylinder such that the boot partially melted and stuck to it.

That much heat is usually caused by overly lean, caused by too much air or not enough fuel, or a combination of the two.

I already bought 6 new injectors, so covered not enough fuel. Making sure the intake seals should cover too much air. Think that should keep the new motor from suffering the same fate, any thoughts?

Regards,

Steve

[blue62]

Originally Posted by Silber

You might be right, I don’t think it will hurt anything to make sure that the intake seals completely.

However, Something caused #2 to self destruct. The spark plug got so hot only on that cylinder such that the boot partially melted and stuck to it.

That much heat is usually caused by overly lean, caused by too much air or not enough fuel, or a combination of the two.

I already bought 6 new injectors, so covered not enough fuel. Making sure the intake seals should cover too much air. Think that should keep the new motor from suffering the same fate, any thoughts?

Regards,

Steve

Perhaps you could look at the exhaust valve seats and see if there is evidence of excessive heat. Or if there are other signs of excessive heat on the head, piston, or any area around cyl. #2. The piston should show signs.
My thought is that your engine went because of a mechanical issue versus a fuel/Air issue.
It is possible that a single cyl. went lean and burned up but it should have showed signs of that before imploding. You should have felt the cyl. dropping out or something.

[ike84]

Originally Posted by Silber

You might be right, I don’t think it will hurt anything to make sure that the intake seals completely.

However, Something caused #2 to self destruct. The spark plug got so hot only on that cylinder such that the boot partially melted and stuck to it.

That much heat is usually caused by overly lean, caused by too much air or not enough fuel, or a combination of the two.

I already bought 6 new injectors, so covered not enough fuel. Making sure the intake seals should cover too much air. Think that should keep the new motor from suffering the same fate, any thoughts?

Regards,

Steve

This isn't entirely accurate. Lean burns do not cause excess heat. Lean burns can cause detonation, which forces the flame wave in unitended directions and consequently cause certain areas to run hot. Lean burning by itself, however, runs cool. If you don't believe me, grab a blow torch and max out the flame. Then start turning down the fuel knob and see what happens. A more objective proof of this lies in aerospace applications, where pilots have relied for many decades on cht and egt readings to monitor their engine status. Any pilot who understands these number will back up what I am saying here.

Sent from my SM-G970U1 using Tapatalk

[blue62]

I just RE-viewed the picture in post #15 you can see ring bits, valve head, and other bits.
If that hole got hot enough to cause a valve to drop you should see signs of excess heat on the ring pieces or valve bits. I don't see that.