 cam timing, cam timing |
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| Charles Freeborn |
 Apr 21 2021, 01:01 PM
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#1
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Member  Group: Members Posts: 244 Joined: 21-May 14 From: United States Member No.: 17,377 Region Association: Pacific Northwest  |
Assembling my 2.0L / T4. with a fresh WebCam 86b with 106º lobe centers. Cam drive is straight cut gears with slotted holes for timing. Question for those of you who have done a set up with these parameters. Did you do the positive stop TDC with heads on or off, with a stop bolt or dial indicator? Through the plug hole with heads on? Because of the Lobe Center specs considering retarding 1º from cam card spec.
Thoughts? Thx. |
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| Driver174 |
Apr 22 2021, 11:04 PM
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#2
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Member Group: Members Posts: 106 Joined: 2-February 17 From: Nevada Member No.: 20,806 Region Association: None 
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The positive stop method works great, and there is no need for a dial indicator when determining TDC.
Once your degree wheel/pointer is set to indicate top dead center, you will need a dial indicator to measure valve lift. The heads have to be installed, and valve lash adjusted to measure valve lift. |
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| Krieger |
Apr 25 2021, 08:56 AM
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#3
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Advanced Member Group: Members Posts: 4,703 Joined: 24-May 04 From: Santa Rosa CA Member No.: 2,104 Region Association: None
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I've done it both ways. I think the best way was heads off with a dial indicator. Once I found tdc with dial indicator I used a short, skinny metal ruler to scratch a tdc mark on the flywheel relative to the location of the engine stand next to flywheel. I would recheck tdc with the ruler when needed.
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| Charles Freeborn |
Apr 25 2021, 10:17 AM
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#4
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Member Group: Members Posts: 244 Joined: 21-May 14 From: United States Member No.: 17,377 Region Association: Pacific Northwest |
Tried both methods and built some tooling for TDC, etc. Postive stop as well as dial - both work fine. I got a degree wheel from Webcam so that's spot on.
However... there are some tricky bits. Webcam gives it's spec at .050" of lift at the valve not the lifter, so one really has to take the measurements with heads on, dial set up to read from top of valve retainer and everything parallel and square to the travel of the valve. Fiddly but do-able. I spent the better part of an entire day doing rocker geometry, cutting pushrods and setting timing. Hopefully everything is correct and the rest of the assembly goes smoothly. This engine has been a task to say the least. Took some bad advice early on and am still paying for it now.. |
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