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09-14-2020, 04:30 PM | #21 |
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Re: Question on cam gear marks
Good
R |
09-14-2020, 07:04 PM | #22 |
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Re: Question on cam gear marks
Just a guess , a loose valve seat ? Valve guide broken ? Massive vacuum leak ?
You’ll figure it out . Probably around 2 am while sleeping . Some of my most hardest problems are solved that way . |
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09-15-2020, 06:45 PM | #23 | |
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Re: Question on cam gear marks
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Good luck , i hope this testing process makes sense , Gary |
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09-16-2020, 04:59 PM | #24 |
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Re: Question on cam gear marks
Gary, with all plugs removed it cranks like any other flat v8. When running, I have removed ignition from each plug and checked how it reacted and with throttle. All seemed to respond in a similar manner. Thanks for thinking about my problem. I'm putting it aside for a few days to put my thoughts together.
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09-16-2020, 05:34 PM | #25 |
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Re: Question on cam gear marks
Russ, I've been following this thread. A bit hard to diagnose over the computer. However, the first thought I had, I haven't seen it mentioned, but a very useful diagnostic tool is a vacuum gauge. Such a device can be handy for pinpointing late valve timing, sticking valves, ign timing, etc....Can you possibly run it with a vac gauge hooked up?
My other thought; a blown out heat riser in the inlet manifold. Good luck, Brian
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09-17-2020, 10:33 AM | #26 |
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Re: Question on cam gear marks
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I really am interested in your blown heat riser suggestion. I will check that! |
09-17-2020, 10:49 AM | #27 | |
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Re: Question on cam gear marks
Quote:
Edit: I was hoping this gif would be animated. You can see it move here: https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAD Last edited by Automotive Stud; 09-17-2020 at 11:06 AM. |
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09-17-2020, 05:55 PM | #28 |
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Re: Question on cam gear marks
This a cut and paste from Gofast 2017 Works well one turn of the cam and done.
R Easiest method we've found is follow the firing order, set both valves on that cylinder that would be firing! Two complete turns of the engine, you're done. Doesn't get any easier! Thanks, Gary in N.Y. P.S. This method will allow you to double-check the valves already set by spot-checking all the previously set valves. If any change is felt on any already adjusted simply re-set it at that point! __________________ |
09-17-2020, 09:37 PM | #29 |
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Re: Question on cam gear marks
I have posted a pic of the cam and cam gear marks on my 1935 21 stud.. I took this picture after a very bad experience with this engine. As you can see the mark on the cam is very small and hard to see if you don't know what you are looking for. Earlier my engine rebuilder had an apprentice assemble the engine. He didn't know what he was doing and assembled (pressed on) the cam to cam gear miles off the the correct spot. Of course the engine did not run and it didn't take too long to figure what the problem was. As you probably can imagine it was a lot of work to fix it. I was not pleased. At some point later the design of the cam to cam gear assembly was changed to preclude the ability to make this mistake. Jim in San Jose
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09-19-2020, 10:37 AM | #30 |
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Re: Question on cam gear marks
Checking the cam timing with a degree wheel is never a bad idea - I always do this. BUT, unless the cam is manufactured incorrectly (or you want to alter the timing), and both gears are correctly manufactured, then all you do is put the crank in first, with the crank gear timing mark straight up, then put the cam in so the mark on it's gear aligns to the crank gear. Assuming you have a bolt-on cam gear, there is really nothing to think about as far as where the valves are located . . . just align the dang marks. As the cam gear is indexed to the cam bolts, it can't be installed incorrectly - so if the cam/crank gear marks are aligned, then you're good to go.
Validation: You can then install both valves on #1 cylinder, figure out where TDC is (you'll need a way to create a timing pointer and mark the crank pulley), then you can use a degree wheel and validate the cam timing. It is NOT uncommon to find that some of the aftermarket performance cams grinders - do not deliver cams that correctly match their timing tags. Even worse, in some cases you can't even advance/retard the cam to get them to a correct timing - as the lobes themselves are "off". |
09-19-2020, 10:43 AM | #31 | |
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Re: Question on cam gear marks
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09-19-2020, 12:21 PM | #32 | |
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Re: Question on cam gear marks
Quote:
Ford made this stuff really simple -- if you aligned the timing marks on the gears, then you should be good to go - as the distributor can be taken on/off the vehicle and the timing does not change - due to the indexed/offset t-slot. Hope this helps! B&S |
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09-19-2020, 02:38 PM | #33 |
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Re: Question on cam gear marks
Automotive Stud When you put the cam in a flathead for the first time where are the timing marks at. Lined up cam mark at 6 o clock and crank mark at 12 o'clock or cam and crank both at 12 o'clock. Tell us.
R |
09-24-2020, 09:26 AM | #34 | |
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Re: Question on cam gear marks
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Yes that is correct, same as anything else. |
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09-24-2020, 10:03 AM | #35 |
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Re: Question on cam gear marks
Automotive Stud You are thinking the flathead tdc when cam is first in that it the same as what happens with a small block chevy. They are not the same. When marks are set up with a small bloc that is at tdc #1 cyl is at tdc exhaust and tdc #6 is at tdc compression. In a flathead when marks are at 6 cam and 12 crank the engine is at tdc compression # 1 no need to do anything.. In a small block some turn as you say to put it at #1 tdc compression that is up to the builder. That isn't really required if the dizzy is installed with the rotor pointing at #6 as the engine is already at compression on 6.You can wire starting with 6 and carry on from there or turn engine till rotor lines up with #1 and start plug wires from there.
R |
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