Camshat dowel pin length from a 93 to 95 Vented style
08-22-2004, 01:49 PM
#1
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Camshat dowel pin length from a 93 to 95 Vented style
I converted a non vented Opti to a 95 Vented Opti and need to know what is the minimum and maximum length of the dowel pin. Right now mine is a .240" from the face of the cam (cam is a Hot Cam so it is drilled for the new Opti), and I measured from cam bolts to to the tip of the dowel and it is .160". Physically you can see it will be able to turn the opti with no problem, and it looks as if .620 is actually to far out. So, if it can turn the opti, is it okay, or is it possible it is too short, even though you can see it fits?
08-22-2004, 04:56 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
My stock cam pin length was ~ .650 from the face of the cam. I measured the protrusion of the stock pin from the face of the stock cam gear to be ~.410. It is said that the dowel pin length can be .685 for the vented opti.
08-22-2004, 06:23 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Thanks, I am going to put it back together as is. The pin fits in the opti just fine, and we'll see if there is a priblem later. Nothing in the service manuals from GM say ohterwise, and the DYNASPARK says a maximum of .600 basically. SO we'll see. Thanks again.
08-23-2004, 04:38 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
The GMPPs catalog has a tech foot note saying dowel for 95+ opti should be no longer than .620" , and yes, the Dynatech folks say it should be no longer than .605".
Since I have a DynaTech opti and want to keep the warranty good, I set mine for just under .605"
It must be just long enough to get the job done. If it is too long, it will shorten the opti's life.
Since I have a DynaTech opti and want to keep the warranty good, I set mine for just under .605"
It must be just long enough to get the job done. If it is too long, it will shorten the opti's life.
08-23-2004, 07:11 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Originally Posted by Don 97 SS
The GMPPs catalog has a tech foot note saying dowel for 95+ opti should be no longer than .620" , and yes, the Dynatech folks say it should be no longer than .605".
Since I have a DynaTech opti and want to keep the warranty good, I set mine for just under .605"
It must be just long enough to get the job done. If it is too long, it will shorten the opti's life.
Since I have a DynaTech opti and want to keep the warranty good, I set mine for just under .605"
It must be just long enough to get the job done. If it is too long, it will shorten the opti's life.
Not sure of the validity, but the .685 value is supposedly taken from GM blueprints.
08-23-2004, 08:51 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Originally Posted by shoebox
It seems .620 is conservative, since my stock one was .650 and easily could have been longer (judging from the witness marks on the inside of the opti drive).
Not sure of the validity, but the .685 value is supposedly taken from GM blueprints.
Not sure of the validity, but the .685 value is supposedly taken from GM blueprints.
I wonder where DynaTech got the .605" business. It is not a typo on their literature or website. I spoke directly to Phil an engineer as he went out of his way to emphasize setting the correct length.
How long is truly too long based on others actual experience?
03-21-2005, 05:20 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
I just mesured mine it is huge .593 from the face of the cam sproket. just guessing the cam sproket is probbaly close to .2 that make my pin from the cam face somewhere around .8XX that might explain why my car kills opti's every 3000-5000 miles.
03-21-2005, 07:05 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Originally Posted by slp223
I just mesured mine it is huge .593 from the face of the cam sproket. just guessing the cam sproket is probbaly close to .2 that make my pin from the cam face somewhere around .8XX that might explain why my car kills opti's every 3000-5000 miles.
That's why I have the warning in the beginning of my cam install guide. My Comp Cams cam came with a .840" pin. Compare the CC on the right to stock.
03-21-2005, 07:30 PM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
I untill the a day ago i had never heard of this problem. hell i did that cam in may of 02. when I ordered it was doing a vented opti swap so i knew the new one was supposed to be longer so when i got it and looked at it was long like is was supposed to be. kind of chaps my ***. i have constant problems with opti's
03-25-2005, 05:50 AM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Originally Posted by shoebox
That's why I have the warning in the beginning of my cam install guide.
03-25-2005, 07:53 AM
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Re: Camshat dowel pin length from a 93 to 95 Vented style
Originally Posted by arnie
Is it possible to get that warning to flash or change colors when guys link to your site?
I can make it flash if necessary, though.