RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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Can anyone check the true position of TDC with a dial gauge with reference to the actual timing marks on the crank pulley?
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Limecat
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Registered: 25th Jun 05
Location: The Internet
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The fact it is a linear motion on the end of a circular one means it is bloody piss easy to tell when it is TDC! 
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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I did this once, its around 15 degrees away from true TDC, cant remember if its ATDC or BTDC though.
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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quote:
Originally posted by LETGSI16V
The fact it is a linear motion on the end of a circular one means it is bloody piss easy to tell when it is TDC!
Thats not what I'm asking is it?
How confident are you with that figure Dave? I can figure out whether its BTDC or ATDC from that.
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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well I measured it as 15 degrees, so did Noble motorsport last time I was there. I am doing a timing belt later, possibly wednesday If I dont get time today and can check it then if you like?
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RCS
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Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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Yeah that'd be awesome cheers.
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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out of interest, why do you need it?
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RCS
Member
Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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To get my cam timing in Ricardo WAVE spot on. When measuring the cams I used the timing mark on the pulley, but the results suggested this was not the true TDC.
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Dave A
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Registered: 10th Dec 03
Location: County Durham
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what are you building?
I have often found that using simulators to determine cam timing works well in theory but often the calculations are thrown out of the window when setting up the cams on the dyno. I used a Lotus engine simulator to design my new cams to get minimal overlap low down that didnt sacrifice high revs power.
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RCS
Member
Registered: 26th Jan 05
Location: Lichfield/Dundee
User status: Offline
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C16XE with mantzel, standard cams and exhaust. Then developing new cams and exhaust manifold from that.
There will be differences on the dyno due to the valvetrain acting as a damper, especially with hydraulic lifters.
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