This is the EXACT way I find TDC when building a engine. across the cyl bore and a stop bolt or with the heads on and just replaced the bottom end the sparkplug stop bolt. The wistler was another option as mentiioned. My be I am wrong ,but I ASSUMED Tony was trying to stab a distributor ! So again I ASSUMED all the assy stuff was on the engine already. So the cork,finger,wistler or watching the intake rocker arm( I like ti rest my palm on it) while viewing the dampner will give you #1 fire @TDC disclamer if you dampner has not sliped, the cam was not put in backwards
----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, April 05, 2002 2:55 PM Subject: RE: [Chevelle-List] Finding #1 TDC > Imagining that 12:00 is TDC, 1 revolution of the crank > from TDC to TDC is a symmetric operation. With the > piston at BDC (6:00) and the piston stop in place, the > piston will encounter the stop at the same height in the > bore (distance from TDC) whether the crank is turned CW > or CCW. For example, say the stop is installed in such > a way that starting at BDC and going CW, the piston > contacts it at 10:00. Conversely, going CCW the piston > will contact it at 2:00. The midway point, or 12:00, > would then be TDC. Basically the piston stop prevents > you from completing the circle. The midpoint we're > interested in is the midpoint of the uncompleted arc > (TDC), not the midpoint of the completed stop-to-stop > arc (BDC). > > Note that you don't have to start with the piston at > BDC, but if done this way the amount of CW crank > rotation will be different from the amount of CCW > rotation. However, that doesn't matter because the > piston stop will still contact the piston with the > piston at the same distance from TDC regardless of > rotational direction. > > Brad > > > I think I need the hand puppets and/or flash cards, because I'm still not > > getting how TDC is between the tops of the two upstrokes. Wouldn't that be > > the bottom? You're drawing random marks and saying TDC is between them? I'm > > obviously just not getting this. Well, the cork and straw method never lies. > > You also never mentioned how you know which stroke you are on when the > > piston hits the stop, so it sounds like a good way to end up with your > > distributor (the reason this thread started) 180 degrees out roughly 50% of > > the time. > > > > John "lost cause" Nasta > > ------------------------------------------------ > Get the award winning ISP, AT&T WorldNet Service > http://download.att.net/webtag > > ----------------------------------------------------- > To Unsubscribe please visit www.chevelles.net/list.html > To start a new topic, send mail to: [EMAIL PROTECTED] > ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
