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Milodon Gear DRive |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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Typhooner, I have the instructions that 304_dude sent me on my work computer. I'll get them to you tomorrow.
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70 Javelin SST, second owner, purchased 1972
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carlanga
AMC Fan Joined: Jan/09/2010 Status: Offline Points: 1 |
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Lo he usado por años sin ningún problema si se graduan de manera correcta por las instrucciones de MILODON no se escuchan
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806 |
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No one said gear drives break camshafts or cause failures (other than them failing). But they do provide a direct link to transmit crankshaft vibration to the camshaft- which doesn't seem like it could be beneficial. If the camshaft is being turned, the gears are under load and backlash is removed from the system providing a direct and rigid path. No one said timing belts don't fail. Of course they do. I've driven vehicles with timing belts for ~400k miles with no issues. The only negative is they are a maintenance item and difficult to change- so they're unsuitable for most people which is why most manufacturers use chains. Otherwise belts are ideal as they give precise timing and will tend to dampen vibrations compared to other methods. What does NASCAR use for cam timing? |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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What do sports cars use that endure up to 24 hours of continuous punishment in endurance racing. |
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70 Javelin SST, second owner, purchased 1972
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74Bubblefender
AMC Addicted Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
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Very good accurate timing, literally vibrate the oil away from wear surfaces in the heads.
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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
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74Bubblefender
AMC Addicted Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
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Yes, yes and in some cases a dampener isnt even used. So you eat up valve train parts faster. Fast forward a little while and those little anodized rings became lawn art.
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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
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White70JavelinSST
Supporter of TheAMCForum Joined: Aug/08/2012 Location: Minnesota Status: Offline Points: 4866 |
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74bubblefender, Are your experiences with a Milodon drive or a Pete Jackson drive, or both? and from severe use of an engine thusly equipped, is that correct? |
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70 Javelin SST, second owner, purchased 1972
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74Bubblefender
AMC Addicted Charter Member Joined: Jun/29/2007 Location: The AMC form Status: Offline Points: 2589 |
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Milodon...well you dont put one it a street car thinking you did yourself a big favor. You also dont put one in a race engine of any kind and think you did yourself a favor. I would never touch a pete jackson gear drive or a milodon again in my forseeable future. They are conversation pieces and that is where they stand with me. Working on a new production front end soon here. Too early to discuss more but we are bringing in a young buck well known person who is in their senior year of engineering this spring to help on the project. Should be fun! If not exhausting. |
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We are just about to forge new AMC V8 crankshafts.. please check here
http://www.bulltear.com/forums/showthread.php?19564 |
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maximus7001
Supporter of TheAMCForum Joined: Jun/27/2011 Location: Winnipeg,Canada Status: Offline Points: 1086 |
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In general camshaft bearing clearance gets ignored. When someone just "throws" a new cam into an engine there is no regard to any clearances and the cam just flops around in the old bearings. This is going to cause problems with A: gear drives and B: distributor and cam gears. What happens to diff gears if the bearings are all floppy? Gears need to mesh without constantly changing clearances. There seems to be all sorts of mystery about both of these. I have never heard of anyone talk about these scenarios.
Edited by maximus7001 - Feb/19/2019 at 6:36pm |
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1968 Javelin SST
1997 GMC Safari AWD 2001 Daewoo Nubira SX (Winnipeg only model) 1997 Honda Accord EX (Canadian Model) Winnipeg, home of the Jets. |
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Steve_P
AMC Addicted Charter Member Joined: Jun/28/2007 Status: Offline Points: 3806 |
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Am I the only one that's read David Vizard's books on SBC engines? He talks about vibration dampers, gear drives, timing chains, etc.
Summary: In back to back dyno tests, a 350-400 HP engine equipped with a heavy factory vibration damper makes 5-10 more HP than the same one with a light aluminum hub. And a good aftermarket damper will make a little more power than the factory elastomer damper. How? Well, the damper does its job and dampens vibrations that would otherwise get transferred to the camshaft. Vibrating a camshaft is not good as it disturbs the intended motion profile that the designer spent so much time developing. Now add in a gear drive and you'll really get vibration transfer. This is not good. direct quote: Tests indicate that on an all out race SBC there's the potential to lose 14 HP by allowing too much torsional crank vibration to be transmitted to the camshaft... Gear drives present a solid coupling between the crank and the cam....and have a tendency to transmit greater vibration amplitudes than a chain or belt. IMO, The only place a camshaft gear drive makes sense is in commercial vehicles where downtime is $. Edited by Steve_P - Feb/20/2019 at 7:01am |
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