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| How much to drill my camgear? https://www.slantsix.org/forum/viewtopic.php?t=3660 |
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| Author: | CrAlt [ Tue May 21, 2002 7:24 pm ] |
| Post subject: | How much to drill my camgear? |
How big are the offset bushings? 3/8? The pin looks to be 1/4"...so if the bushings are 3/8 and 8 deg. is all the way to one side of the hole you have to drill then 5/16" might land me in the 4deg area? The gear spins clockwise so I want to move the pin to the right side wall of the bigger hole (holding gear with hole on top) to advance it? cralt@optonline.net |
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| Author: | dschumers [ Tue May 21, 2002 8:59 pm ] |
| Post subject: | Re: DD: How much to drill my camgear? |
I used a 3/8" bit when I drilled mine. I don't remember which way the bushing went though. Dennis slantzilla@excite.com |
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| Author: | Doc. [ Wed May 22, 2002 10:53 am ] |
| Post subject: | Re: How much to drill my cam gear? |
Quote:
: How big are the offset bushings? 3/8? : The pin looks to be 1/4"...so if the : bushings are 3/8 and 8deg is all the way to : one side of the hole you have to drill then : 5/16" might land me in the 4deg area? : : The gear spins clockwise so I want to move the : pin to the right side wall of the biger hole : (holding gear with hole on top) to advance : it? To use the off set bushings, drill out the current 1/4 cam gear hole to 3/8, follow the current hole location and just drill it oversize. If you are shifting cam position without the bushing kit, oblong the current 1/4 hole to allow the cam / dowel pin to move forward, clockwise, ( for advancing) that is towards the right side of the oversized gear hole wall. DD |
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| Author: | bud L. [ Thu May 23, 2002 2:15 am ] |
| Post subject: | Re: DD: How much to drill my camgear? |
First off, it's damn near impossible to drill it offset to an existing hole, without using a Bridgeport type mill and an end mill and a lot of machinist savvy. But if you had those things you wouldn't be asking that question. For gosh sakes, buy an offset bushing kit, they're not terribly expensive. I haven't done one on a sl/6, but it's probably much like a B/RB engine. You drill the hole whatever size the o/set bshg is, but don't drill all the way through the gear, just far enough so that the depth of the hole allows the bushing to sit flush with the front face of the cam gear when it's inserted. Beg, borrow, or buy an old DC racing manual, or a Mopar Performance Engine manual and follow the instructions precisely to degree (AKA centerlining) the cam. The o/set bshgs will not always move the cam the exact amount stated, or expected. So, it's a bit of a trial and error operation. But I strongly recommend that you do degree the cam to optimize the benefits of a new cam. While you're at it, you have to find exact Top Dead Center, and you can use that opportunity to check the TDC mark on the Dampener. If it's OK, "match mark" the outer ring of the dampener and the inner hub, so if the outer ring slips you'll visually be able to verify it. Good luck. Quote:
: : I used a 3/8" bit when I drilled mine. I : don't remember which way the bushing went : though. Dennis fglmopar@aol.com |
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