PhilW 400 Posted June 9, 2019 Report Share Posted June 9, 2019 Im beginning to wonder if my TDC marks on the flywheel are correct. I dis read someone else had this issue. Someone has centre punched a mark 10mm or so to the right of TDC flywheel mark. To be 100% i suppose sticking a welding rod into the cylinder and finding its highest point would confirm if i am right. Theres got to be a reason for the centre dot and im not running very well. Carbs are popping a bit. Thanks for your thoughts Quote Link to post Share on other sites
Barrykearley 6,856 Posted June 9, 2019 Report Share Posted June 9, 2019 There’s a known issue of accuracy between flywheel indicators and bottom pulley indicators. Only by checking for TDC will you know Quote Only here once Link to post Share on other sites
PhilW 400 Posted June 9, 2019 Author Report Share Posted June 9, 2019 So welding rod in the pot Barry must be the only sure fire way? Quote Link to post Share on other sites
drdoom 399 Posted June 9, 2019 Report Share Posted June 9, 2019 Welding rod in the pot, as long as it is firmly connected to a dial indicator instrument. The motion of piston near TDC becomes vague so not useful in describing directly. The method is to bracket an angular figure both sides of TDC via equal measurements of piston displacement. TDC will be established as the mid point between these, made possible with confidence only by use of a D.I. gauge. Cheers 1 Quote Link to post Share on other sites
Sparky 2,833 Posted June 9, 2019 Report Share Posted June 9, 2019 In 40 years, I've seen one incorrectly marked flywheel, and it wasn't a Lotus. Quote British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland. And Shitfaced Silly Sod to Sweden. Link to post Share on other sites
C43 55 Posted June 9, 2019 Report Share Posted June 9, 2019 My Esprit was wrong. I spent ages trying to get the timing right and could not work out why the figures I was getting was so far away form the book figures. It's only when I took the car to a local specialist did we find out it was wrong. I guess the engine had been rebuilt wrong. Quote Link to post Share on other sites
Sparky 2,833 Posted June 9, 2019 Report Share Posted June 9, 2019 But what exactly was wrong? Quote British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland. And Shitfaced Silly Sod to Sweden. Link to post Share on other sites
910Esprit 531 Posted June 9, 2019 Report Share Posted June 9, 2019 You also have a timing mark on the front pulley, If they both align to TDC at the same point, it wil be pretty certain your flywheel timing marks are correct Quote Link to post Share on other sites
Sparky 2,833 Posted June 9, 2019 Report Share Posted June 9, 2019 And if they don't (ask @Trevsked) I'll bet the farm the flywheel is the correct one. 1 Quote British Fart to Florida, Nude to New York, Dunce to Denmark, Numpty to Newfoundland. And Shitfaced Silly Sod to Sweden. Link to post Share on other sites
C43 55 Posted June 10, 2019 Report Share Posted June 10, 2019 On mine the timing marks on the flywheel were out. It was a right PITA as they had been nicely highlighted by the previous owner but were about 1 spline out s far as I could work out. As you guys say the only way to tell for sure is take plug out of #1 cylinder and find TDC with a length of wire and a DTI. If you approach it from both directions a few times you should get an accurate reading. good luck C43 Quote Link to post Share on other sites
ekwan 70 Posted June 12, 2019 Report Share Posted June 12, 2019 On 09/06/2019 at 20:05, Barrykearley said: There’s a known issue of accuracy between flywheel indicators and bottom pulley indicators. Only by checking for TDC will you know Which is more consistent though, and by what percentage? Quote Link to post Share on other sites
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