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8upZR1 · 10-27-2006

Thankyou for the phone #. I will give him a call today. Initially I only checked compression in #6 cause that was the cylinder that happened to be on the power stroke and therefore both cams were riding on the base circle. I had a theory that the valves were open on the base circle but that was just not the case. I only checked the compression of the other cylinders after the motor failed to start with the valvecover removed. The cams are good, and correctly installed (L,R,I,E). The cams are held perfectly in place by the small caps that go on before the valvecover. There is no play. If the caps were pressing down on the cams they probably would not turn easily, but mine do. I thought the lifters were over extended, however, they are completely empty of all oil and can be compressed slightly by hand. When I had the valvecover off I pushed against the lifter and this created a measurable gap between the cam and lifter. This tells me that the valves are completely seated, as the valvespring would be pushing against the lifter and the gap would be closed if the valve was not on the seat. I checked the valve job seal by pouring water into the intake and exhaust ports to CC them. The ports hold water without any leakage. Also I believe that this is mostly intake related as I was seeing combustion occur inside the injector housing ports when I tried to start the motor without the plenum, and minimal flow coming from the exhaust.

I just don't know anymore. I will call this Corey fellow, perhaps he has experienced this. I hate the LT5, and everyone who owns a working example. F you all.

10-27-2006	#12
8upZR1 Join Date: Jun 2006 Location: Thunderbolt, Ga. Posts: 253	Re: LT5 technical problem Thankyou for the phone #. I will give him a call today. Initially I only checked compression in #6 cause that was the cylinder that happened to be on the power stroke and therefore both cams were riding on the base circle. I had a theory that the valves were open on the base circle but that was just not the case. I only checked the compression of the other cylinders after the motor failed to start with the valvecover removed. The cams are good, and correctly installed (L,R,I,E). The cams are held perfectly in place by the small caps that go on before the valvecover. There is no play. If the caps were pressing down on the cams they probably would not turn easily, but mine do. I thought the lifters were over extended, however, they are completely empty of all oil and can be compressed slightly by hand. When I had the valvecover off I pushed against the lifter and this created a measurable gap between the cam and lifter. This tells me that the valves are completely seated, as the valvespring would be pushing against the lifter and the gap would be closed if the valve was not on the seat. I checked the valve job seal by pouring water into the intake and exhaust ports to CC them. The ports hold water without any leakage. Also I believe that this is mostly intake related as I was seeing combustion occur inside the injector housing ports when I tried to start the motor without the plenum, and minimal flow coming from the exhaust. I just don't know anymore. I will call this Corey fellow, perhaps he has experienced this. I hate the LT5, and everyone who owns a working example. F you all.