I'm running a custom grind Comp cam. The morons didn't drill the hole in the face of the cam deep enough, so the opti shaft (vented) won't fit.

I went with a billet core because it made me feel cool. Will that make it tough to drill? Should any "special" type of bit be used? All tips are appreciated.

 

If the hole isn't deep enough, why don't you just trim down the pin instead of risking opening up the hole so the pin doesn't have a good fit?

-brent

 

Just a thought, but maybe the pin itself is too long?
Is the cam already installed?

 

I should have explained more clearly. The dowel pin is the proper length. I'd rather not trim down the shaft of the opti, but I guess that's always a possibility. As it is right now, I'd have to trim the opti shaft quite a bit.

I have a stock cam to compare it to and the "hole" for this aftermarket cam is only about 1/3 as deep. Yes, the cam is already installed, but the motor is on an engine stand.

 

If you do end up drilling it, make sure you get a good carbide drill bit, and make sure you drill it straight.

 

Who sells them, Sears?

 

Update:

I had a junk opti laying around so I hacked off a good 2/3 of the shaft to test fit it. It still sits about 1/16 inch too far off. Looks like that's not an option.

I should probably just take the cam to a machinist so he can open the hole up the right way on a drill press.


Thanks for the help guys.

 

Why not just take another 1/16 off?

Give us some meausurements - whats the depth of the hole in the cam??? What the length that the pin is currently sticking out of the cam???

Mine ended up being .635 from the face of the cam to the end of the pin.

Here's a link dealing with the pin measurements

http://web.camaross.com/forums/showt...hreadid=138931

 

I'm hesitant to trim the opti shaft that much because I figure it must be there for a reason. If I cut the opti shaft any more, it will be nothing more than a stub (maybe 1/2"). Maybe it's that long so if the cam walks, the shaft will still be seated in the cam? I don't know.

The dowel pin is the stock length. The problem is, the hole in the cam is tapered inward, so virtually none of the opti shaft will fit in it. So it's actually the shallow and tapered hole in the cam that's preventing the opti from seating, not a dowel pin that's too long. I guess the big question is, what's the purpose of the opti shaft?

 

That dowel drives the Opti, if you have no Opti you have no spark or timing. That shaft just needs to be up to .620" long from the face of the cam. If it is much longer you will eventually ruin the bearing in the Opti which will result in early failure of the function.

If the hole in the cam face is too small, well then it needs to be enlarged enough to allow the dowel to fit but fit tightly and hold the dowel.

 

OK - I get it now - you're not talking about the dowel pin hole, you're talking about the hole in the center of the cam face that the o-ring'd shaft part of the opti slides through. Right??? I think when you said "opti shaft", many of us misinterpreted that and thought you were reffering to the dowel pin.

Damn, you actually cut that down... Hopefully you cut on the old spare opti and not the new one. If it's the center hole that your talking about, and it's not deep enough, I'd send the cam back to comp cams and have them fix it.

 

Yeah, it's the hole in the center of the cam, not the dowel. Ideally, Comp would fix it, but I don't have he patience to wait for shipping both ways and wait for them to "get around to it."

 

k - last question then...

No disrespect... but are you sure it's bottoming out? Sometimes the opti doesnt want to slide in, unless you put a little oil on the oring.

 

Yep. When I look at the "cam hole" the diameter of it is actually smaller than the diameter of the opti shaft.