dwd Posted August 8, 2019 Share Posted August 8, 2019 I am trying to time my series (petrol 2.25), workshop manual says TDC with 90 octane or 3deg with 83 octane, modern petrol is 95 octane or above anyone have an ideas of where I should set the timing? Quote Link to comment Share on other sites More sharing options...
steve b Posted August 8, 2019 Share Posted August 8, 2019 3 to 5 degrees BTDC static then check it when running with a timing light . cheers Steve b Quote Link to comment Share on other sites More sharing options...
simonb Posted August 8, 2019 Share Posted August 8, 2019 Yep 6 degrees BTDC on unleaded (checked with a strobe) works well. Quote Link to comment Share on other sites More sharing options...
dwd Posted August 12, 2019 Author Share Posted August 12, 2019 Many thanks for your time, another beginners question just to make sure I am doing this correctly is BTDC to the right of the timing pointer & ATDC to the left, as per this photo of my setup? Quote Link to comment Share on other sites More sharing options...
steve b Posted August 12, 2019 Share Posted August 12, 2019 You are right . It could be worth pulling no.1 plug and checking TDC is correct with a screwdriver and rocking it back and forth past the mark before you start the procedure cheers Steve b Quote Link to comment Share on other sites More sharing options...
dwd Posted August 16, 2019 Author Share Posted August 16, 2019 Think I have got it wrong as engine rotates clockwise then BTDC is to the left of the timing mark & ATDC is to the right! Quote Link to comment Share on other sites More sharing options...
lo-fi Posted August 16, 2019 Share Posted August 16, 2019 No, think it through... If you were to set TDC and rotate the crank counter clockwise five degrees, you'd be five degrees before TDC. The TDC marker on the pulley would be to the left of the fixed pointer. Quote Link to comment Share on other sites More sharing options...
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