01-20-2020, 01:25 PM | #11 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,593
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Re: VC460 valvetrain noise?
Some of the racers shim both the crank and cam shafts for end play. I have bought the shims for both for my Omega VC 460 build. I gather the only way to do that on the cam is to preassemble the block and front cover without the piston/crank/rod and then measure the end play of the cam. Paul of Paulskarts found that 5/8" arbor shaft shim kits serve this purpose perfectly. I bought the set listed on amazon" arbor steel shim kit 25160" FYI I measured the 2 cams I have laying here and found the VC192-1,174100 to be .030" wider than 192,14-1-128. The first being a VC supplied torque cam and the second an early VC stock clone cam.
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01-20-2020, 03:22 PM | #12 | |
Crazy Ole Man
Join Date: Jan 2016
Location: Owego NY
Posts: 2,758
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Re: VC460 valvetrain noise?
Quote:
https://www.hunker.com/13405378/how-...ratton-engines |
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01-20-2020, 03:57 PM | #13 |
Not Yet Wild
Join Date: Sep 2019
Posts: 48
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Re: VC460 valvetrain noise?
I was cognizant of the compression release when I initially set the valves. and I actually tightened down the adjusters to zero lash in addition to preloading the valves to see if that would get rid of this noise. but it did not the knocking/ticking is still there even with no lash at all.
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01-20-2020, 04:59 PM | #14 |
Gone Wild
Join Date: Jan 2019
Posts: 190
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Re: VC460 valvetrain noise?
I shared earlier what the VC460 cam sounded like in the VC460, this is the same VC460 cam in a 420 both with HD springs and same valve lash. You can hear the difference between the videos that the VC460 cam in the VC460 makes a lot more valve train noise.
In all fairness, the VC460 is sold as a racing engine and as someone said at VC "The 460s are designed to have looser tolerances than a 420 because it has to live in a more demanding environment (racing go karts) vs a standard 420 which is designed as a stationary engine that runs one speed all day long and doesn’t get beat as hard as a 460 would.", so with an open header like in kart racing who would even hear it. My VC460 is used in a motorcycle where the muffler is needed and why I did all the experimenting to determine the root cause of the noise. |
01-20-2020, 05:26 PM | #15 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,593
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Re: VC460 valvetrain noise?
Rocking the flywheel back and forth probably does show camshaft end play with the helical cam gears. I am not so sure the OP merely hand turning his engine over in one direction shows the same problem. Even odder is the noise happening with the engine running at rpms where I can't imagine the cam not being under a constant load against one side of the engine where end play would enter the picture.
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01-20-2020, 07:54 PM | #16 |
Not Yet Wild
Join Date: Sep 2019
Posts: 48
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Re: VC460 valvetrain noise?
So a little update. I have no solution yet, crank has .014 endplay to it. The stock predator 420 cam does NOT fix the noise. I even put the stock 420 pushrods and rocker arms on it, noise is still there.
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01-20-2020, 08:05 PM | #17 | |
Gone Wild
Join Date: Jan 2019
Posts: 190
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Re: VC460 valvetrain noise?
Quote:
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01-20-2020, 08:05 PM | #18 |
VC 460 CLONE GONE WILD
Join Date: Oct 2014
Location: Ray BY The Bay NJ
Posts: 10,593
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Re: VC460 valvetrain noise?
Do the cam bosses on both the side cover and block appear to be intact ?
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01-20-2020, 08:27 PM | #19 |
Not Yet Wild
Join Date: Sep 2019
Posts: 48
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Re: VC460 valvetrain noise?
Just ran out to check and both cam bosses looks good and new. the cam fits nice and tight in its bore. The VC cam is .005 shorter overall length and shoulder to shoulder, as well as .005 smaller OD on the gear when compared to the stock one. but being as the stock cam STILL makes the noise that doesn't really mean much. The noise sounds like steel on steel, when I am jockeying the cam around hitting the crank gear to gear it really sounds like the noise Im chasing. I really thought a cam swap would fix it, I will say the noise SEEMS quieter with the stock cam but its still there, and its NOT there in the totally stock 420 predator engine.
I also put very weak setup valve springs on to replace the actual full strength valve springs and the noise is essentially all gone. I have been emailing Ivan at Vegas carts, thats who always talks to me about any tech issues and he basically said to find someone who is familiar with the engine to figure it out and since they quit assembling the engines 3 years ago he doesnt know anything about them and cannot help me. So they wont be any help here. I think I need to check camshaft thrust play next.. |
01-20-2020, 11:27 PM | #20 |
Gone Wild
Join Date: Jun 2011
Location: Kingston Springs Tn.
Posts: 874
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Re: VC460 valvetrain noise?
When I was having trouble with Vegas Ivan was no help you need to talk to Geoff if you can
Good luck |
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