Post by jackthefuzz on May 7, 2008 11:26:30 GMT -5
make sure you only turn the crank to TDC by turning counter clockwise. do not turn it back to tdc even a small amount or you will not get the exhaust valve properly adjusted and that will effect performance. if you think you havent done this on prior adjustments and your mid and top end performance is suffereing, re adjust your valves making sure not to turn the crank counter clockwise. if you do turn it counter clockwise you will have to turn the crank clockwise 2 revolutions to TDC or it wont be right.
this is what I found
I finally found out how that camshaft stopper works. this the doohicky that sits next to the bearing on the camshaft. it only ratates in one direction and is held in place by the metal bridge that runs between the rocker arms. there is a flat spot on the camshaft stopper where the exhaust rocker rests. if the engine tries to run backwards it holds the exhaust valve open. This stopper is not on any of the high performance cams with the exception of the c6 cam from pfs that comes packaged with their HP head. Since I have almost from day one had a high performance cam A9 through A11 installed I never paid much attention to the direction i rotated the engine to get to TDC. When I installed the c6 cam this past weekend i couldnt get the engine to run over 4000 rpm and it was just very weak in performance. I couldnt figure out why until i looked closely at that cam stopper. so i put the metal bridge in place and put it back together still not paying much attention to the position of the stopper and it ran better but still not good above 4000rpm. This time I carefully looked at everything again and found a bunch of play in the exaust valve even though i was very careful to adjust it properly the first time. LOL WTH? so here is the deal. to get that exhaust valve adjusted properly you can only turn the crank clockwise to TDC, if you back it up even a little bit you wont get the exhaust valve adjusted properly and it has a huge impact on performance above 4000 rpm. it start to buck and smoke like it was running very rich. So the final time I adjusted the exhaust valve i was very carefull to make sure the stopper was in the right position and then adjusted the valve. the engine run perfectly. this cam stopper is OEM std equipment so anyone with the OEM cam be aware that adjusting that valve after turning the crankshaft counterclockwise will result in poor performance.
this is what I found
I finally found out how that camshaft stopper works. this the doohicky that sits next to the bearing on the camshaft. it only ratates in one direction and is held in place by the metal bridge that runs between the rocker arms. there is a flat spot on the camshaft stopper where the exhaust rocker rests. if the engine tries to run backwards it holds the exhaust valve open. This stopper is not on any of the high performance cams with the exception of the c6 cam from pfs that comes packaged with their HP head. Since I have almost from day one had a high performance cam A9 through A11 installed I never paid much attention to the direction i rotated the engine to get to TDC. When I installed the c6 cam this past weekend i couldnt get the engine to run over 4000 rpm and it was just very weak in performance. I couldnt figure out why until i looked closely at that cam stopper. so i put the metal bridge in place and put it back together still not paying much attention to the position of the stopper and it ran better but still not good above 4000rpm. This time I carefully looked at everything again and found a bunch of play in the exaust valve even though i was very careful to adjust it properly the first time. LOL WTH? so here is the deal. to get that exhaust valve adjusted properly you can only turn the crank clockwise to TDC, if you back it up even a little bit you wont get the exhaust valve adjusted properly and it has a huge impact on performance above 4000 rpm. it start to buck and smoke like it was running very rich. So the final time I adjusted the exhaust valve i was very carefull to make sure the stopper was in the right position and then adjusted the valve. the engine run perfectly. this cam stopper is OEM std equipment so anyone with the OEM cam be aware that adjusting that valve after turning the crankshaft counterclockwise will result in poor performance.
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