after the cam install the car would miss and buck and all that good stuff so my friend and i check out the opti and the opti bearing was shot. took it off and we could hear stuff rattling around in there. So we put on a brand new opti along with a brand new set of OVC wires. The car does not buck like crazy anymore but definately still misses. only sputters at over like 10 percent throttle, under that it seems to be fine. what do you guys think?

 

sure you got the opti on there all the way? the thing should sit FLAT on the block...1/32 of an inch off the block is not flat i mean without pushing on it it has gotta sit flat...
same situation happened to my car too...missing like crazy and would stall with any throttle over 10%...so just give it a try

 

well it wouldntgo 100 percent flat against the block so we used some washers to make it even. do you think thats it? how can we make it flat without the washers and how long till the opti is trashed???

 

Way bad thing to do. Sounds like your dowel pin is too long. That should have been checked when both cams were out. There was a thread just yesterday on dowel pin length. Search for the info. Depending on how much pressure there is on the back of the opti, your new one may already be trashed.

 

how can u shorten the dowel pin length if it is too long?

 

Grind it down.....

 

damn, i hope the opti is still good.... only drove it home (45 mins) so far. any chance the opti is ok?

 

The opti may still be ok, But I would try to rma it and say its bad, just go get another one for assurance, I wouldnt wanna do the opti 4-5 times.. You can grind the dowl pin down with a dremel or something of that sort. and the opti must be flat to the block...

 

I'm the installer.

The dowel pin on the aftermarket cam is the same length as the stock cam .620" I used white out on the opti where the dowel pin gets installed and the pin was not bottoming out on the opti. After playing with it for a while I couldn't figure out why the opti was not sitting flush on the timing chain cover so I washered it up so that what ever was not making the opti sit flush would not have pressure on the rotating part of the opti.

Doug D

 

Doug, that washer thing still seems to be a bad idea. SOmething is not fitting correctly or it would be flush. It must fit flush. That needs to be addressed first before looking elsewhere.

Also, did you get the timing chain on correctly after the cam swap? Some miss a tooth and that will definitely cause a problem.

 

The timing chain went on just fine, not sure what you mean by missing a tooth, but there is no way to install it wrong. The only other thing I can think of is the male end of the opti with the two o rings might not be fitting right. I used white out on the tip of that alwo when we slid it into the came and it showed no signs of bottoming out.

Not sure what else to look at.

Doug D

 

He's saying was the cam gear dot and the crank gear dot lined up dot to dot when the chain was installed....if they arnt exactly dot to dot the timing would be off. I also agree that you need to get the opti bolted down without the washers....washers are not machined or pressed to a pesice enough thikness to work well as spacers for something spining as fast as the opti does. If the opti does not go down flush it will vibrate...not good.

 

Another thing to consider about the washer thing would be that if the opti isn't seated right, you stand a good possibility of the oil seals not being seated right, causing a leak. Just food for thought.

 

yea, the dowel pin seemed to fit fine (white-out experiment) but the opti still had trouble sitting flush. its not leaking.....at all. hmm. one of the many mysteries lol. it'll be worth it though, i cant wait

 

if its not the opti.....what could it be? and if the dowel pin was the right length (620), why wouldnt the opti sit flush?
me = stumped