turbotom
20+ Year Contributor
- 104
- 11
- Sep 27, 2003
-
New Bedford,
Massachusetts
Ok I was working on my buddies car and the car had BC280s which the car has been running great. Well noticed the top timing cover was chewing up on the timing belt so we decided to change the belt and change cams to HKS 272s because he didn't like having only top end power with the BC 280s, he wanted some mid range power as well. So after all said and done, I crank the engine over by hand and also with the ignition off and fuel off, everything worked out great. Timing was on the money. Start the car up, sounds funny and noticed cylinder #1 seems to have no compression.
Hooked up the compression tester and have 0psi of compression.
Did a wet test, 0psi.
Took both intake and exhaust rockers off, 0psi.
I used a buddies video scope and looked down the piston to see if they hit the piston and saw nothing!
Inspect the head gasket and everything seems fine, checked for loose ARP head stud nuts maybe loose, nothing which I haven't seen yet a arp head stud back off so i don't know.
Put the rockers back the intake side only to build up compression, 0psi.
4-3-2 have 155psi on the nose, to be running and now 0psi in #1 is weird.
The only thing I could think of is:
maybe the base circle of the cam is too big?
Too much carbon build up causing not to seat right?
Bad rings?
Bent valves?
I don't know this makes no sense how the car ran and now 0psi
Well great minds come up with good solutions, my brain is burnt right now so any good advise would be great, thanks guys
Hooked up the compression tester and have 0psi of compression.
Did a wet test, 0psi.
Took both intake and exhaust rockers off, 0psi.
I used a buddies video scope and looked down the piston to see if they hit the piston and saw nothing!
Inspect the head gasket and everything seems fine, checked for loose ARP head stud nuts maybe loose, nothing which I haven't seen yet a arp head stud back off so i don't know.
Put the rockers back the intake side only to build up compression, 0psi.
4-3-2 have 155psi on the nose, to be running and now 0psi in #1 is weird.
The only thing I could think of is:
maybe the base circle of the cam is too big?
Too much carbon build up causing not to seat right?
Bad rings?
Bent valves?
I don't know this makes no sense how the car ran and now 0psi
Well great minds come up with good solutions, my brain is burnt right now so any good advise would be great, thanks guys