Problems after head/cam install
Thread Starter
Safety Car
Joined: Dec 2000
Posts: 4,329
Likes: 10
From: Cape Coral fl
Problems after head/cam install
I have a friend that had a comp 224/228 .581/.588 cam, LS6 intake, new CNC Patriot LS6 heads with 59cc combustion chambers, comp 918 springs, LS7 clutch, SLP underdrive pulley, LS7 lifters, and 42lb injectors installed on his 1999 Corvette.
The car has only 21 degress of timing in, and has an issue with audible detonation at about 5300-5800. You can also feel the power dip in that range as well. There is no knock showing up on logs at this range, so we are kind of lost. Has anyone experienced this?
Pic of dyno chart with dip:
Tony
The car has only 21 degress of timing in, and has an issue with audible detonation at about 5300-5800. You can also feel the power dip in that range as well. There is no knock showing up on logs at this range, so we are kind of lost. Has anyone experienced this?
Pic of dyno chart with dip:
Tony
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
If you not showing Knock retard, then something is wrong with the KN function. Are you sure that your KR tables are set up correctly in the system your using to data log the engine.
My EFI Live will show KR and what timing cells that its happening in. What Data Logging software are you using?????/
BC
My EFI Live will show KR and what timing cells that its happening in. What Data Logging software are you using?????/
BC
Tech Contributor
Joined: Jan 2007
Posts: 19,524
Likes: 1,195
From: Dyer, IN
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
What's the PTV on that setup? More milling than mine and less valve drop then my AFR's to start with but same cam and mine were slightly below the minimum recommended on the intake side.
Instructor
Joined: Dec 2009
Posts: 102
Likes: 0
From: Los Angeles Ca
If you not showing Knock retard, then something is wrong with the KN function. Are you sure that your KR tables are set up correctly in the system your using to data log the engine.
My EFI Live will show KR and what timing cells that its happening in. What Data Logging software are you using?????/
BC
My EFI Live will show KR and what timing cells that its happening in. What Data Logging software are you using?????/
BC
