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I think I know what that piece of white plastic is.
Originally Posted by Ahsai
So I removed the fuel injectors and plan to send them out for cleaning. When I removed the cyl #1 injector, I found a small piece of chewed up plastic INSIDE the fuel rail. 1/4" x 1/"4, enough to block the injector inlet. I wonder how it got there. It wasn't introduced by me for sure as I capped off the fuel line connector as soon as I disconnected it. It's white soft plastic. Any one knows what it is and how it got there? Needless to say, I borescoped both fuel rails to make sure there is no more foreign matter.
I wonder if Cringely ever had any intermittent misfires on cyl #1
So I removed the fuel injectors and plan to send them out for cleaning. When I removed the cyl #1 injector, I found a small piece of chewed up plastic INSIDE the fuel rail. 1/4" x 1/"4, enough to block the injector inlet. I wonder how it got there. It wasn't introduced by me for sure as I capped off the fuel line connector as soon as I disconnected it. It's white soft plastic. Any one knows what it is and how it got there? Needless to say, I borescoped both fuel rails to make sure there is no more foreign matter.
I wonder if Cringely ever had any intermittent misfires on cyl #1
Not that I know of. Engine ran smooth and I didn't seem to experience hesitation on acceleration.
P.S., I am truly impressed with Ahsai's efforts. That should be one fantastic motor when finished.
Hello Cringely! Was testing if you're still reading this thread
I think that piece of plastic is a piece shaved off the bottom of the previous coolant tank! The color and texture matched. Most likely someone unbolted that big hex cap on the bank 1 fuel rail to get more clearance when removing the coolant tank. When wiggling the tank out, unknowingly the opened cap bung scraped off a piece from the tank bottom and the piece fell into the rail. That explained why the piece looks like chewed up.
That piece laid right on top of the #1 injector inlet when I removed the injector. It was definitely blocking the injector flow but probably not enough to cause issues. If it had stayed deeper in the fuel rail and not visible, I would have missed it. I think I was lucky.
Originally Posted by cringely
Not that I know of. Engine ran smooth and I didn't seem to experience hesitation on acceleration.
P.S., I am truly impressed with Ahsai's efforts. That should be one fantastic motor when finished.
Thanks guys. Btw, I dodged another bullet and will post soon.
Jake is absolutely right when he said we need to have a combative mind when dealing with these engines as if they were trying to kill you (your wallet).
So what happens at hot idle when pressure is below 1.5 bar is it just splash/ mist lubrication for the bores until revs increase and the pressure comes up ?
So what happens at hot idle when pressure is below 1.5 bar is it just splash/ mist lubrication for the bores until revs increase and the pressure comes up ?
That is correct. It's actually 1.8 bar and here's what Porsche says in the 1999 Service Info material:
"The engine has oil-spray nozzles, used for cylinder cooling to reduce the piston temperature. The injection nozzles are inserted in the bearing case. The nozzles have an opening pressure of 1.8 bar. This ensures that the engine oil pressure is retained at low engine speeds and high engine oil temperatures.
06-19-2016, 02:52 AM
