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 825 Posts Member #: 9661 Post Whore Sheffield South Yorkshire GB. |
30th Jun, 2013 at 02:21:59pm
Posted this up to help a friend and thought it would be helpful to others.
Edited by nala56 on 1st Jul, 2013. Main Build
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 1425 Posts Member #: 9199 Post Whore Lancashire |
2nd Jul, 2013 at 06:37:42am
great simple explanation but why do you need to bring it back 5 thou? each time. What the mind can conceive the mini can achieve
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614 Posts Member #: 2153 Post Whore kings langley |
2nd Jul, 2013 at 07:03:15am
I always turn the engine in its direction of rotation through .050" btdc then .050" atdc and take measurements at both never turn it backwards as there will be backlash in your chain Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet
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614 Posts Member #: 2153 Post Whore kings langley |
2nd Jul, 2013 at 07:03:29am
I always turn the engine in its direction of rotation through .050" btdc then .050" atdc and take measurements at both never turn it backwards as there will be backlash in your chain Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet
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614 Posts Member #: 2153 Post Whore kings langley |
2nd Jul, 2013 at 07:03:30am
I always turn the engine in its direction of rotation through .050" btdc then .050" atdc and take measurements at both never turn it backwards as there will be backlash in your chain Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet
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614 Posts Member #: 2153 Post Whore kings langley |
2nd Jul, 2013 at 07:03:59am
Well that got my point across Speeding is like masturbating, everyone does it, but not all of us film it and put it on the internet
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1425 Posts Member #: 9199 Post Whore Lancashire |
2nd Jul, 2013 at 07:30:36am
On 2nd Jul, 2013 supermotolee said:
I always turn the engine in its direction of rotation through .050" btdc then .050" atdc and take measurements at both never turn it backwards as there will be backlash in your chain What the mind can conceive the mini can achieve
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3594 Posts Member #: 655 Post Whore Northern Ireland |
2nd Jul, 2013 at 07:47:19am
Other option for finding TDC without a dial gauge down the hole.
9.85 @ 145mph
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 9502 Posts Member #: 1023 Post Whore Doncaster, South Yorkshire |
2nd Jul, 2013 at 08:00:04am
I have used both of the above methods.... maybe this time i will make a propper tdc marker instead of thinking ahh feck whilst trying to dial in the crank sensor
Edited by Brett on 2nd Jul, 2013. Yes i moved to the darkside |
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825 Posts Member #: 9661 Post Whore Sheffield South Yorkshire GB. |
2nd Jul, 2013 at 04:14:21pm
This way your taking the engines slack up in both directions to find true TDC because of the dwell you get when the piston is at the top of its stroke. Its just the same as making a dead stop like stevieturbo says his way is ok if don't have a dial gauge.
On 2nd Jul, 2013 lee.pb said:
great simple explanation but why do you need to bring it back 5 thou? each time. Main Build
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 2054 Posts Member #: 452 Post Whore Chester, UK |
2nd Jul, 2013 at 04:16:48pm
i got me ma to tell me when the piston was flat and never went up or down as i was turning the pulley :)
Edited by t@z on 2nd Jul, 2013. |
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825 Posts Member #: 9661 Post Whore Sheffield South Yorkshire GB. |
2nd Jul, 2013 at 04:28:20pm
Just to add about turning the engine to 50thou I should have said its just an approximate number it can be 40 or 60 it's done to make sure your going far enough back so that when you turn back the crank to spot on 5 thou you have taken the slack up in that direction. Main Build
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825 Posts Member #: 9661 Post Whore Sheffield South Yorkshire GB. |
2nd Jul, 2013 at 04:37:49pm
If your not accurate with TDC. When doing your cam timing You will be a long way out.
On 2nd Jul, 2013 t@z said:
i got me ma to tell me when the piston was flat and never went up or down as i was turning the pulley :) obv not the most efficient solution :) awesome bit of info though deffo one for tech sticky stuff Main Build
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825 Posts Member #: 9661 Post Whore Sheffield South Yorkshire GB. |
2nd Jul, 2013 at 04:49:02pm
The way I have explained it above is the way I set up to start cam timing.
On 2nd Jul, 2013 stevieturbo said:
Other option for finding TDC without a dial gauge down the hole. Make a dead stop from an old spark plug. Basically something that the piston will hit and go no further. then proceed as above. Rotate one direction until dead stop. Place a mark. Rotate the opposite way until dead stop. Again mark. TDC is exactly in the middle. Direction of rotation at this point is not important as you are not taking any measurements from the camshaft so chain slack etc doesnt matter. That will only come into play when taking readings from the camshaft. Main Build
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