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Post by gy6fandan on Jul 16, 2014 17:20:06 GMT -5
Just saw a video on a guy that installed an A9 camshaft and has a problem. Just want to make sure I don't have problems like him. Cant find specs (way of measuring A9 cam) prior to install to make sure its not faulty / actually an A9. My upgrade will consist of the A9 cam and Big Port Valve Head with stainless steel valves and High Compression Valve Springs Rated to 12,000 RPM . Just curious what this guys problem may be and how I can "AVOID" the problem with my setup. A9 camshaft problemThanks for any "BEWARE" / "LOOK OUT FOR" info upfront..... Like timing mods / valve spec changes, etc. |
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Post by alleyoop on Jul 16, 2014 17:43:38 GMT -5
That sounds more like he put on the chain wrong and or Tensioner and the chain is slapping if the sound is coming from that low in the head. If it was the cam you would hear noises up on top NOT down further in the JUG. He could of put the chain with the slack on the bottom and not the top, many make that mistake.
Alleyoop
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Post by gy6fandan on Jul 16, 2014 17:47:42 GMT -5
Alleyoop---> Thanks,
Are there any "BEWARE" / "LOOK OUT FOR" info upfront with my install plans..... Like timing mods / valve spec changes, etc.
My upgrade will consist of the A9 cam and Big Port Valve Head with stainless steel valves and High Compression Valve Springs Rated to 12,000 RPM ----- this all on a stock cylinder. gy6150
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Post by alleyoop on Jul 16, 2014 18:57:52 GMT -5
Nope pretty easy installation really, it is just the top end. What I do recommend is bring the current setup as if your going to adjust the valves and then mark the The cam and chain like this then transfer the mark on the cam over to the new A9 cam and you will be right ON TIME. Valve adjustment same not a problem  Alleyoop  |
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Post by gy6fandan on Jul 16, 2014 19:42:41 GMT -5
Alleyoop---> Thanks,...Again.  Tomorrow I am going to try and upload the A9 cam and Big Port Valve Head photos with some digital caliper measurements along with the same on my originals for comparison. I already found some measurement differences in the cam holder on the new head and want to make sure my new stuff is not defective. Being my third head change in under 7,000 miles I'm getting weary of of the labor and looking forward to simply enjoying the ride. |
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Post by jerseyboy on Jul 16, 2014 21:34:05 GMT -5
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Post by alleyoop on Jul 16, 2014 21:58:34 GMT -5
Sounds great, just hope the jug fits in the 157QMJ case without boring.
Alleyoop
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Post by jerseyboy on Jul 17, 2014 12:19:28 GMT -5
Sounds great, just hope the jug fits in the 157QMJ case without boring. Alleyoop The auction says it does and I read somewhere you can get away with a 61mm in a 157QMJ sometimes...if its close Im sure a little zip zip wouldnt hurt anything,,just need to plug the hole to the case from shavings... |
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Post by wilds on Jul 17, 2014 12:40:20 GMT -5
If I where you I would choose the A11 cam. These are the specs of different GY6 cams (from a french site):  |
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Post by gy6fandan on Jul 17, 2014 14:31:25 GMT -5
Piston to valve clearance - Anyone know I can check that before I install my new cylinder head ?
It was mentioned on another forum and I am clueless on this.
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Post by alleyoop on Jul 17, 2014 14:52:17 GMT -5
You do not have to worry about that, some folks just do not know what in the they are talking about. Only way possible for the piston to POSSIBLY hit a valve is if your way out of time having the valve open when the piston reaches TDC and if you do that you deserve a broken valve and or piston.
The amount of lift is VERY MINIMAL at best if any its the duration the valves are keep opened that controls the amount of fuel and air.
Alleyoop
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Post by gy6fandan on Jul 17, 2014 15:14:05 GMT -5
Alleyoop --> I'm getting conflicting info. 90GTVert stated the following on another post : "You need to put some modeling clay across the top of the piston. It's best to apply oil or some type of lube to each side so the clay doesn't stick so bad after the test. Assemble the top end and set valve lash. Turn the engine over two full revolutions (1 revolution of the cam). Remove the head. You should be able to immediately see if the clay has been broken through, indicating the valves are hitting the piston. Even if not, you need to do farther checks. I cut the clay in half across the centers of the valve indents with a razor, then measure the thinnest point. Be careful not to squish the clay when working with it " I know that you ( Alleyoop ) and him ( 90GTVert ) both know your stuff . So I am really lost on this. However, I found a link to the method 90GTVert stated above : How To Check Piston-to-valve Clearance |
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Post by jerseyboy on Jul 17, 2014 15:43:22 GMT -5
Looks like the A8 has the best torque below 6K rpm,,thats where I like to hang the most,,40-45 MPH 5K R's and Im smiling  |
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Post by gy6fandan on Jul 17, 2014 15:45:36 GMT -5
Is the - "A8" - stock or an upgrade from stock ? If its not stock, what is ?
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Post by jerseyboy on Jul 17, 2014 15:47:27 GMT -5
Dont know,,maybe Alley knows...wonder if just upgrading the cam would make much difference for now,,still waiting for Walter....
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..BAD TO THE BONE..
