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> Decided to rig up a degree wheel, ARGH!! Valve Train Geometry
DNHunt
post Sep 3 2004, 09:22 PM
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I decided to rig up a degree wheel to use in setting up the valve train. It's just a paper 360 degree disk stuck on my trigger wheel with a pointer off 1 of the studs for the cooling shroud. It should be interesting to see where valves open and close.

Dave


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DNHunt
post Sep 3 2004, 09:26 PM
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I think it will make it a little easier to replicate TDC. I expect to be repeating this stuff a bunch


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d7n7master
post Sep 3 2004, 10:09 PM
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SOB!!! I want your engine stand!!! OH,,,,,,,,,,& the results of your v/t setup. That's actually the ONLY thing I miss about my bugs. Man, 7 1/2 degrees - static - done. That was then.
Everytime I kick my '73 2.0 to 3.5k to check/set the timing I think about how simple life once ways. Too many timing marks - so little time (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif) (IMG:style_emoticons/default/lol2.gif)
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Mueller
post Sep 4 2004, 01:22 AM
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look'n good Dave (IMG:style_emoticons/default/pray.gif)


nice degree wheel, I just printed out a few for this weekend (IMG:style_emoticons/default/smash.gif)
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Tom Perso
post Sep 4 2004, 05:35 AM
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Have fun with that!!!

Do you have the v/t springs setup in your heads? Those double-throw down dual springs will bend an adjustable pushrod in a blink of an eye.

Tom
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DNHunt
post Sep 4 2004, 06:59 AM
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Tom

Mine are some single springs. I have some springs from the hardware store I can use if need be.

Dave
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Tom Perso
post Sep 4 2004, 07:44 AM
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You are all set!!!

Good luck... What type of pushrods are you using?

Tom
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DNHunt
post Sep 4 2004, 08:32 AM
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Chromoly
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DNHunt
post Sep 4 2004, 08:34 AM
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Here's a picture of the trial springs on the valve stems


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DNHunt
post Sep 4 2004, 08:37 AM
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I made a little stand for the dial indicator that rests on the valve cover sealing surface


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DNHunt
post Sep 4 2004, 08:40 AM
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I've got a rectangular frame that clamps the indicator stand down. It uses threaded rod and clips into the holes that hold the valve cover bales.

As soon as the kid wakes up we'll install the rocker studs and start checking stuff. I might have a little wait, he had his first high school dance last night.


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DNHunt
post Sep 4 2004, 09:32 PM
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Well, we managed to get 1 cylinder done. Dad had a little problem with a rotor on backwards, which I thought was the cam drive off 180 degrees or the dizzy drive. The kid said check the rotor. Don't ask how come I took a couple of hours to figure it out.

Here we are already to start on #1 exhaust


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DNHunt
post Sep 4 2004, 09:39 PM
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The idea is to get the adjuster parallel to the valve stem at half opening. The intake ended up at .514 and the exhaust ended up at .487.

Here is the intake


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DNHunt
post Sep 4 2004, 09:46 PM
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A lot of trial and error. Here as good a shot as I could get of what I think it's supposed to look like at half open.

I need a beer (IMG:style_emoticons/default/givemebeer.gif)

Dave


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swood
post Sep 6 2004, 01:07 PM
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Dave, how's the vtg going? What adjusters are you using, looks like a pointy tip or something.

Steve
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Jake Raby
post Sep 6 2004, 03:27 PM
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Dave, looking good! I like your tool for the geometry!

I sent you an email
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DNHunt
post Sep 6 2004, 03:28 PM
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The adjusters are swivel feet. The one in the picture is an old pointy thing I ground so I could see better. Here's a better picture of the adjusters. Note they are not on center engine front to engine back. A couple are about 3/4 of a mm one way or the other.

Reading the cam at the valve just drove me crazy. I had to keep asking myself how many times did that go around. It turns out the cam has more lift on the intake than the exhaust but a longer duration on the exhaust. The intake ramps up faster so the duration at .050" is almost the same.

The rocker shims are thicker on the 1, 2 side than the 3, 4 side. I think I have it right.

Dave


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Jake Raby
post Sep 6 2004, 03:30 PM
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Looks great Dave... Thats what its suppose to look like. Isn't it funny how close my guess was on the pushrod length.

I have used that cam atleast 200 times (IMG:style_emoticons/default/boldblue.gif)
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DNHunt
post Sep 6 2004, 03:32 PM
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Here's Gerry torqueing down the rockers to check the crossover point on #4.


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