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#81
01-01-2013, 08:10 PM
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I believe that with a valley pan on or off makes no differance in adjusting valves at all, at least i think so, I am still confused on one small piece of this puzzle. ok we are trying to find true TDC correct?? You suggest using a metal strap across the cyclinder and slowly bring piston up to ware it hits the stop then correct?? ok then if you are using a bolt for example as the stop so how are you calling TDC??? How visuably are you seeing your piston stopping at TDC i still fill with a indicator you actually see it stop and then ad stop and adj. bolt accordingly. Then you can rotate motor in counterclockwise position until it happens again then you can split differance. What am i missing here??? Dwell in my mind is the amount of time piston is just sitting at TDC Correct???
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#82
01-01-2013, 08:17 PM
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Quote:
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#83
01-01-2013, 08:55 PM
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Quote:
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#84
01-01-2013, 08:58 PM
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67cruiser, here's a short video of the process of finding TDC
http://www.youtube.com/watch?v=azLX1pi2oVE
__________________
 66 GTO, 495, M22, Strange S-60 w/4.10 Sold new at Ace Wilson's Royal Pontiac http://www.youtube.com/watch?v=cUHC-Z8xhtg |
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#85
01-01-2013, 09:18 PM
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This is the way I do it on our PSM, the spark plug is directly over the center of the piston so it is easy with head on, but it would be the same way if your head is off your car engine. You could do it on also.
Put on TDC, or as close as you can, bolt on degree wheel and pointer, position pointer on 0 of degree wheel run a secured strap of some sort across cylinder with a threaded bolt ground to a dull point in the center of the piston. Rotate to 20deg ATDC and adjust bolt to touch piston, then rotate same direction until it touches the piston again. If it stop's at 20 BTDC you are at true TDC. If it does not, adjust pointer accordingly (half the amount off) and repeat process till it does. |
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#86
01-01-2013, 09:56 PM
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winner ^^^^^^^
__________________
EHTTFMF!  Being dead, it is not hard on you. You don't even know you're dead. It is hard on everyone else that is not dead. BEING STUPID WORKS THE SAME WAY! The rest of us suffer. |
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#87
01-01-2013, 10:07 PM
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ok, you say i don,t understand, But watch the video again , the strap DOES NOT go clean across bore and there is a bolt in the middle ok, I don,t see bolt sticking thru bottom anyplace, thats ok if you have a o decked block but what say for instance piston was down inside the block( for example) .040 then what is telling you that you are at TDC then???? Then if i understand you and the theory you basically don,t want piston to come up all the way then, YOUR SPLITTING DIFFERANCE forwards then backwards correct??? Sorry but video would say to stay away from deck sure would make it easier to understand. Seen 3 video,s believe the explanation is not clear.
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#88
01-01-2013, 10:32 PM
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B-I-N-G-O after seeing the video for the 3rd tiime i see not it does not matter how far piston is down in the bore either direction you simply split differance both directions to find TDC!! Now why didn,t they just say that in the first place!! LOL
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#89
01-01-2013, 11:07 PM
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I thought I did in a couple of my posts where I said that the piston stop could be .050" in the hole, .200" in the hole, or .250" in the hole, you still go thru the same exact process.
Tom Vaught ps The strap/stop needs to go across the bore attached to two head bolt holes to keep the bar from having a diving board effect when the piston comes up and contacts the stop.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#90
01-01-2013, 11:21 PM
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Correct 67 cruiser, and personally I like more distance down in the hole. I just think half of a bigger angle is more accurate than half of a small angle. It's just my preference.
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#91
01-02-2013, 04:29 PM
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Sorry guys, sometimes the lites are on but i can,t find my way around!!!lol, seriously i was thinking something completely differant. My thoughts were that the piston had to be all the way up in the bore atTDC but i am trying to find true TDC & see if my balancer lines up correctly. Sorry for my confusion. just switched to 75 watt bulb!!
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#92
01-02-2013, 06:50 PM
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Most concept are fairly easy to grasp once you can visualize what is going on in your brain. The deal about the Light Bulb "going on" has more truth in it than many believe.
Glad you are starting to grasp the concept. Tom Vaught
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#93
01-03-2013, 04:50 PM
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Thanks for all the help guys, i have all the plugs out, made my own piston stop today from a Old AC plug, and can,t wait to try it out!! Ill let you all Know what i find out.
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#94
01-03-2013, 10:09 PM
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Be careful as you bring the piston up against the spark plug stop and make sure that the spark plug is properly torqued in the head as it is very easy to damage the cylinder head threads when spark plug "Stop" is not torqued and the piston hits it. GENTLE!!!!!!!!!!!!!
Tom Vaught
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#95
01-04-2013, 10:29 AM
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Also if the plug is angled the valves won't bump the stop if the rockers are still hooked up.
__________________
Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
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#96
01-04-2013, 12:29 PM
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Very good point Skip. MArk L
__________________
My Gasser '63 Catalina build. Oh sorry, it's a Street freak. Either way it's a fun build. |
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#97
01-04-2013, 04:08 PM
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Never torqued any plugs before and i will be carefull, great points. Thanks
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#98
01-04-2013, 10:56 PM
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Hmm, Skip, I had never thought about that detail. So you are saying that an angled plug head like my KRE -ports, the valves will not hit the stop, but on a stock head they can?
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#99
01-05-2013, 08:45 PM
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Never thought this post would make it this far, anyways thanks again everyone, wife had a new hip in 2 weeks ago , just trying to find time to try this out. Stay tuned ill let you know the results.
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#100
01-09-2013, 10:19 PM
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Promised to give you results so here go,s!! Tryed the piston stop method today, shoot worked like a dream!!I tripled checked TDC and its dead on i think. rotated engine with plugs out with piston stop in both directions 3 differant times, and split the differance and my balancer is showing as close to perfect as can be. Thanks everyone for the help. So i know im good to go so far!
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