Help - a few of us making less power after Cam install
Posted: Mon Dec 31, 2007 11:26 am
this has been an on going saga for some of us - with a wide variety of cams being used (different brands IPS k2, k2 mkII, skunk, etc)
-dowel pins on cams checked & not pushed in
-cam plates checked & arrows properly line up with parting line of cam caps
-cam gear timing marks line up properly with 9 links space between vertical markings (both pointing in the middle of a link)
-crank gear properly timed - the marked sprocket (a 7 o'clock) points in the middle of a link
-checked cam plates with a 3/16 dowel inserted through holes
-made sure exh cam plate is on exh cam & vise versa with intake plate & cam
-after tensioner reinstalled cranked a few full revolutions to make sure timing is still on @ TDC
I tested muliple intake manifolds & 2 headers made by the same company made to work with these cams. obviosly vtc was datalogged & k-pro shows vtc working as it should
some similarities between some of us are:
-cams make most power with unusual high VTC than those with same cams (that don't have problems making power) ie ~15 more vtc across the hole rpm range
-a few of us switched to RDX injectors (which I had flow tested by RC engineering & flowed much better than stock with a better spray pattern than stock & RC440's) - does polarity matter with these? how about the positioning of the injectors in the manifold - maybe pattern is too wide & catches the end of the passage way?
can a sensor be going bad & NOT throw a code - particularly crank or cam sensors. any other ideas? obviosly valve lash will be rechecked
why does helms manual say to keep magnets away from timing chain?
-Greg
-dowel pins on cams checked & not pushed in
-cam plates checked & arrows properly line up with parting line of cam caps
-cam gear timing marks line up properly with 9 links space between vertical markings (both pointing in the middle of a link)
-crank gear properly timed - the marked sprocket (a 7 o'clock) points in the middle of a link
-checked cam plates with a 3/16 dowel inserted through holes
-made sure exh cam plate is on exh cam & vise versa with intake plate & cam
-after tensioner reinstalled cranked a few full revolutions to make sure timing is still on @ TDC
I tested muliple intake manifolds & 2 headers made by the same company made to work with these cams. obviosly vtc was datalogged & k-pro shows vtc working as it should
some similarities between some of us are:
-cams make most power with unusual high VTC than those with same cams (that don't have problems making power) ie ~15 more vtc across the hole rpm range
-a few of us switched to RDX injectors (which I had flow tested by RC engineering & flowed much better than stock with a better spray pattern than stock & RC440's) - does polarity matter with these? how about the positioning of the injectors in the manifold - maybe pattern is too wide & catches the end of the passage way?
can a sensor be going bad & NOT throw a code - particularly crank or cam sensors. any other ideas? obviosly valve lash will be rechecked
why does helms manual say to keep magnets away from timing chain?
-Greg