Knocking after cam/heads install
03-23-2010, 09:14 PM
#1
Teching In
Thread Starter
iTrader: (7)
Join Date: Apr 2008
Location: Ohio
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
Knocking after cam/heads install EPP forced induction cam
232, .595 int 240, .608 exhaust
7.400 chromeoly pushrods
317 heads milled .007
New ls7 lifters
Ok I started the car after all was back together and let it run for 20 min. There was no noise or other sounds. After I took a break and cleaned up and about an hour later started it again still no noises. After another hour I started it again and pulled it out of my garage...no problems. Then I take the car up to get some gas, maybe a mile or two and never took it above 3k or so and arrived at the gas station and no knocking. I fill up with gas and start the car and it begins to tick. The tick slowly becomes louder and louder. As I made my way home it began to misfire and the check engine light began to flash. When I pulled into my driveway I tried to start it and once again it began knocking on startup and the car ran terrible. Does anyone have advice? Im at a loss and am getting fed up with these troubles. Thanks guys
232, .595 int 240, .608 exhaust
7.400 chromeoly pushrods
317 heads milled .007
New ls7 lifters
Ok I started the car after all was back together and let it run for 20 min. There was no noise or other sounds. After I took a break and cleaned up and about an hour later started it again still no noises. After another hour I started it again and pulled it out of my garage...no problems. Then I take the car up to get some gas, maybe a mile or two and never took it above 3k or so and arrived at the gas station and no knocking. I fill up with gas and start the car and it begins to tick. The tick slowly becomes louder and louder. As I made my way home it began to misfire and the check engine light began to flash. When I pulled into my driveway I tried to start it and once again it began knocking on startup and the car ran terrible. Does anyone have advice? Im at a loss and am getting fed up with these troubles. Thanks guys
03-23-2010, 10:56 PM
#2
EPP forced induction cam
232, .595 int 240, .608 exhaust
7.400 chromeoly pushrods
317 heads milled .007
New ls7 lifters
Ok I started the car after all was back together and let it run for 20 min. There was no noise or other sounds. After I took a break and cleaned up and about an hour later started it again still no noises. After another hour I started it again and pulled it out of my garage...no problems. Then I take the car up to get some gas, maybe a mile or two and never took it above 3k or so and arrived at the gas station and no knocking. I fill up with gas and start the car and it begins to tick. The tick slowly becomes louder and louder. As I made my way home it began to misfire and the check engine light began to flash. When I pulled into my driveway I tried to start it and once again it began knocking on startup and the car ran terrible. Does anyone have advice? Im at a loss and am getting fed up with these troubles. Thanks guys
232, .595 int 240, .608 exhaust
7.400 chromeoly pushrods
317 heads milled .007
New ls7 lifters
Ok I started the car after all was back together and let it run for 20 min. There was no noise or other sounds. After I took a break and cleaned up and about an hour later started it again still no noises. After another hour I started it again and pulled it out of my garage...no problems. Then I take the car up to get some gas, maybe a mile or two and never took it above 3k or so and arrived at the gas station and no knocking. I fill up with gas and start the car and it begins to tick. The tick slowly becomes louder and louder. As I made my way home it began to misfire and the check engine light began to flash. When I pulled into my driveway I tried to start it and once again it began knocking on startup and the car ran terrible. Does anyone have advice? Im at a loss and am getting fed up with these troubles. Thanks guys
03-23-2010, 11:34 PM
#3
TECH Apprentice
iTrader: (17)
Join Date: May 2009
Location: Denver
Posts: 313
Likes: 0
Received 0 Likes
on
0 Posts
if it was the pushrods wouldn't it just make a constant tick and not get any louder? I dont know just tryin to throw some ideas. If it started the noise after you got gas and stuff.. did you use the right octane? I dont know what kind you need with those heads and what kind of compression ratio you have. Could have caused you to fry some plugs too.. im just brainstorming really
03-23-2010, 11:39 PM
#4
TECH Apprentice
iTrader: (12)
Join Date: Oct 2005
Location: uptown dallas
Posts: 325
Likes: 0
Received 0 Likes
on
0 Posts
well hypthetically speaking, IF your pushrods are too long then the tick would be apparent at first but get louder as they bend and then you have rocker noise along with a bent pushrod banging against the lifter bore and lifter itself. heres the fun part. take it apart and see what you find before you have to remove the heads again for other damaged compnents.
Trending Topics
03-24-2010, 05:25 PM
#9
Teching In
Thread Starter
iTrader: (7)
Join Date: Apr 2008
Location: Ohio
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
Well I asked Bob at EPP and those are the pushrods he said to run. The heads were only milled .007 so I didnt think it would cause anything but I could be wrong. The spark plugs are brand new but it is untuned. Im gunna take the valve covers off now and see what I can dig up. Thanks everyone
03-24-2010, 05:39 PM
#11
Well I asked Bob at EPP and those are the pushrods he said to run. The heads were only milled .007 so I didnt think it would cause anything but I could be wrong. The spark plugs are brand new but it is untuned. Im gunna take the valve covers off now and see what I can dig up. Thanks everyone
03-24-2010, 06:14 PM
#14
Teching In
Thread Starter
iTrader: (7)
Join Date: Apr 2008
Location: Ohio
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
Rockers were torqued down but had slight, very slight play from side to side. Unfortunately I dont have a code reader so I cant find that. Im just hoping its not lower end. I dont see why it would be but with my luck no one knows lol
03-24-2010, 11:17 PM
#17
Teching In
Thread Starter
iTrader: (7)
Join Date: Apr 2008
Location: Ohio
Posts: 49
Likes: 0
Received 0 Likes
on
0 Posts
I got it one of my rockers had come loose on the pass side which was causing the tick. the knock I heard was actually my exhaust banging around because I was running filthy rich and fouled out my plugs. All is well now and its somewhat tuned. I still want a dyno tune though. But thanks for your guys help.
