Editing Saturn I4 engine (section)

==DOHC LL0==
[[File:1992 Saturn SC2 Twin Cam engine (Hershey 2019).jpg|thumb|The Twin Cam LL0 engine in a 1992 SC]]
The 1991-1998 DOHC cylinder head had 16 valves and was made of lost foam cast aluminium. The camshafts were held in the cylinder head with bearing caps and driven by a chain off the front crankshaft sprocket. Motion from the camshafts was transmitted to the 16 valves by direct-acting hydraulic lifters.

LL0 cylinder heads were changed slightly in 1995, when Saturn adopted electronic, linear EGR mechanisms, over the previous vacuum actuated design. The head casting was changed to accommodate different mounting surface of the new valve. (1994 CA emissions engines used an adapter to mount the LEGR valve.) 

A new LL0 cylinder head appeared in 1999 using a roller camshaft with hydraulic lifters and rocker arms, but power was unchanged. Also for 1999 provisions for a new air injection reaction system was introduced aimed at improving engine emissions.

All LL0 engines used MPFI and were rated at {{convert|124|hp|kW|0|abbr=on}} at 6000&nbsp;rpm<ref>Saturn corporation specification sheet as shown on website http://www.saturnfans.com/photos/showphoto.php?photo=53949</ref> and {{convert|122|lbft|Nm|0|abbr=on}} at 4800&nbsp;rpm.<ref name="Edmunds3">{{Cite web|url=http://www.edmunds.com/saturn/s-series/1992/features-specs.html?sub=sedan&style=5882|title=1992 Saturn S-Series Features & Specs|year=1992 |accessdate=2012-10-30|work=edmunds.com}}</ref>  The DOHC engine was used in the upper-level model S-series vehicles (SC, SC2, SL2, SW2).