Benz
27-04-2010, 02:47 PM
I moved my boost/vacuum gauge to the engine side of the throttlebodies,[instead of using the boost sensor outlet at the back of the plenum] and noticed immediately there was some flutter showing on the gauge at idle, and got wilder as the revs climbed. I assumed I had a leak at the rubbers, so I did not worry about it at first. I've since installed a power commander111usb,and 350cc high impedance injectors, so naturally while I had it apart I redid the rubbers to head connections, and fired it up. The gauge still fluttered........
So....the head is off to inspect the valves to see if any are bent, burnt, or the valve seats were not right. They seem to be okay, the exhaust valve seats are black, but I can see where they are sealing [ I will lap them in anyway].
My question is, could the inner and outer inlet valve springs touching/binding against each other, cause poor valve sealing, making the vacuum gauge flutter, and the engine to run roughly once warm?
My inlet springs have heavy wear showing, and the inner spring is binding against the outer, to the point where it was extremely difficult to separate them. The inlet outers are taller and slightly narrower than stock[I have spares from another engine to compare with], yet the exhaust springs seem fine, they separate easily, and have next to no wear showing.
I have put up with this engine being rattly virtually since I had it rebuilt, I've taken it back to the builder, who said it was as quiet an engine as he's heard, for an air cooled Geep 810 turbo, but he spent two seconds listening when it was cold, and the oil pressure high, as opposed to when it's hot and sounds like a bucket of bolts!!
I suspect he has installed higher rated [but wrongly sized] outer springs to the inlets only, and charged me for a complete set of springs....:( and the binding is the squealing/rattling noise I've been listening to all this time.
Any thoughts??
So....the head is off to inspect the valves to see if any are bent, burnt, or the valve seats were not right. They seem to be okay, the exhaust valve seats are black, but I can see where they are sealing [ I will lap them in anyway].
My question is, could the inner and outer inlet valve springs touching/binding against each other, cause poor valve sealing, making the vacuum gauge flutter, and the engine to run roughly once warm?
My inlet springs have heavy wear showing, and the inner spring is binding against the outer, to the point where it was extremely difficult to separate them. The inlet outers are taller and slightly narrower than stock[I have spares from another engine to compare with], yet the exhaust springs seem fine, they separate easily, and have next to no wear showing.
I have put up with this engine being rattly virtually since I had it rebuilt, I've taken it back to the builder, who said it was as quiet an engine as he's heard, for an air cooled Geep 810 turbo, but he spent two seconds listening when it was cold, and the oil pressure high, as opposed to when it's hot and sounds like a bucket of bolts!!
I suspect he has installed higher rated [but wrongly sized] outer springs to the inlets only, and charged me for a complete set of springs....:( and the binding is the squealing/rattling noise I've been listening to all this time.
Any thoughts??