Creating ignition table from engine spec.
Posted: Sun Oct 23, 2011 6:24 am
I'm trying to create a ignition table using the advance/retard from the engine specifications.
I have a NA engine (m110) in a MB280 SL which I converted to a MS2 v3 system controlling both fuel and ignition.
I'm not really sure how I should interpret the timing spec for the engine.
Does the "vacuum off" be the same as at WOT?
Could someone please enlighten me how to interpret the given values.
Using the data below should it be something like this or ???
max load(WOT) : 1500rpm/28° ... 3000rpm/34° 4500rpm /36°-40°
..
min load (idling) 850rpm/ 12°BTDC ... 3000rpm/24°(10°less than at WOT due to retard idling)
Firing order & idling speed 1‑5‑3‑6‑2‑4; 750/850 r.p.m.
601. Ignition timing –starter speed 12°BTDC <----------- This must be no load and idling
601a. (Vac. off)‑ 4500 r.p.m 34°BTDC <----------- Is this at max load (WOT)
606. Centrif. adv. at 1500 r.p.m. 28° <----------- min or max load ?
607. Centrif. adv. at 3000 r.p.m. 34° <----------- min or max load ?
608. Vacuum retard idling 10° ± 2° <----------- difference between min /max load ?
609. Vacuum advance at 4500 10° ± 2° (total 36°/40°) <----------- Is this at max load (WOT)?
I have a NA engine (m110) in a MB280 SL which I converted to a MS2 v3 system controlling both fuel and ignition.
I'm not really sure how I should interpret the timing spec for the engine.
Does the "vacuum off" be the same as at WOT?
Could someone please enlighten me how to interpret the given values.
Using the data below should it be something like this or ???
max load(WOT) : 1500rpm/28° ... 3000rpm/34° 4500rpm /36°-40°
..
min load (idling) 850rpm/ 12°BTDC ... 3000rpm/24°(10°less than at WOT due to retard idling)
Firing order & idling speed 1‑5‑3‑6‑2‑4; 750/850 r.p.m.
601. Ignition timing –starter speed 12°BTDC <----------- This must be no load and idling
601a. (Vac. off)‑ 4500 r.p.m 34°BTDC <----------- Is this at max load (WOT)
606. Centrif. adv. at 1500 r.p.m. 28° <----------- min or max load ?
607. Centrif. adv. at 3000 r.p.m. 34° <----------- min or max load ?
608. Vacuum retard idling 10° ± 2° <----------- difference between min /max load ?
609. Vacuum advance at 4500 10° ± 2° (total 36°/40°) <----------- Is this at max load (WOT)?
