SR20 Forum banner

1 - 5 of 5 Posts

·
Not on fire... yet
Joined
·
591 Posts
Discussion Starter #1
Well, I finally figured out why the car wouldn't start, Im not sure what I was thinking (or drinking), but I had shimmed the intake valves wrong so it was leaving the valves open. I tested it and ran it a few miles and it was running great I even went into boost (~9 psi) and I had forgotten how fast this thing was. But then on my full throttle attempt when I shifted out of 1st to 2nd it made a horrific gear grinding noise (that noise that no one ever wants to hear) so I pulled over and pulled the VC to find all the intake rockers scatterted and it was apparent that the valves were bent again.

So, Im back to pulling the motor apart and seeing what happened. At TDC both cam gears were 4 teeth off, so I think the crank sprocket and rails are my culprit, if any body has ideas on what I should change while im pulling all that apart they would be really appreciated.

I also need to thank Eric W. for helping me out again by emailing me the FSM pages to set the timing, Lawrence for mentioning to check the shims, Mike-"Audiboy" for giving me some answers on some DET specifics, as well as everbody who responded to the last post.


Andy

------------------
93 NX2K
some stuff and a DET
"project street mod?"
1988 BMW M3 w/ a few toys
 

·
Not on fire... yet
Joined
·
591 Posts
Discussion Starter #2
I'm wondering, has anyone ever seen a sr20 with a cam that would bind? Im wondering if the cam can warp enough to make it lock up I figured it would break first.

------------------
93 NX2K
some stuff and a DET
"project street mod?"
1988 BMW M3 w/ a few toys
 
G

·
Guest
Joined
·
0 Posts
Andy.... what kind of shyte happened to you? Cripes man. I hate to hear about this. I wonder if the new timing chain tansioner might not be holding oil pressure? Maybe the chains mating marks for the cams or crank sprocket slipped from the alignment marks on the sprockets????? If you need any FSM pages from me, I can scan some for you also. E-mails down for now so please use [email protected]
 

·
Registered
Joined
·
2,463 Posts
Are you going to (or maybe you already did) pull the front cover? Might as well replace the timing chain. Its under a lot of stress when its making pistons bend valves. Just replace it. Make sure all the teeth on the sprockets are in good condition.

Are all the smooth parts where the cam rides in good shape? The removable ones are obviously replaceable, but I wonder if the ones in the head have been damaged at all. Not likely, but check.

Are you using stock (for HVLA) DET cams?
 

·
Not on fire... yet
Joined
·
591 Posts
Discussion Starter #5
Im going to pull the head and front cover this week and I plan on replacing eveything (chain, rail, cam sprockets, crank seal, rank drive gear, etc..) yeah, I checked all the bearing surfaces for the cams (stock DET) and the rail, they were good, I put new cam gears in, and a new tensioner. When I pull the front cover I will have an idea of how bad the crank gear and rails are, I hope tha my problem is there and not something that isn't apparent.

------------------
93 NX2K
some stuff and a DET
"project street mod?"
1988 BMW M3 w/ a few toys
 
1 - 5 of 5 Posts
Top