Some details of the 2AZ-FE engine
in [Toyota]
|
From: Built_Well on 15 Jul 2008 00:33 Did I say frothing? I meant foaming--oil foaming. The 2AZ-FE engine in both the '06 and '08 Camrys is 2.4 liters.
From: Ray O on 15 Jul 2008 00:53 "Built_Well" <Built_Well_Toyota(a)hotmail.com> wrote in message news:97101848-da38-42b3-88d7-6dcb0def23b9(a)s50g2000hsb.googlegroups.com... > > Gonna write this stuff down and post it so I don't lose it. Had > to wade through a lot of pages to find it. The 5th Generation Camry's > 2AZ-FE engine (an advanced powerplant, by the way) is > the same engine that was used in the '01 Highlander SUV. > 5th Generation Camrys cover Model Years '02 - '06. This stuff is interesting if you have an initerest and understanding of engines, but otherwise, it is not that helpful for the average do-it-yourselfer. > > The cylinder block is made of aluminum alloy. It uses aluminum > pistons, high-strength steel connecting rods and caps, forged steel > crankshaft, and, IIRC aluminum camshafts. The VVT-i only works > on the intake camshaft, not the exhaust camshaft. It varies > the timing of the intake valves. There are two intake valves per > cylinder and two exhaust valves per cylinder. Having two of > each increases the total port area, so more air can flow into > and out of the combustion chamber. As the manual's authors > write, "Intake and exhaust efficiency has been increased due > to the larger total port areas." > > The cylinder head cover (not to be confused with the cylinder > head) is made of magnesium alloy for lighter weight. I think > cylinder head cover is synonymous with "valve cover," but the > Camry manual refers to it as the "cylinder head cover." Toyota calls valve covers "cylinder head covers." > > Since the manual doesn't mention what the cylinder head, itself, > is made of, I will assume iron, but just an assumption. The head is also made of aluminum alloy. > > The cylinder head gasket, used between the aluminum engine block > and the (iron?) cylinder head is a steel-laminate type of > material. Any concern about electrolysis taking place between > the steel-laminate and aluminum? > No concerns about electrolysis taking place between the head gasket and aluminum, but you should stick with genuine Toyota coolant. > When the service and repair manual says the dry weight of the > engine is 267 pounds, does that include the crankcase, crank, > cylinder head, and valve head with camshafts--or does the > weight only include the engine block without crankcase > and cyclinder head, etc.? > As Ed mentioned, "dry" means without fluids like oil and coolant. The weight is for the long block, which is basically the entire engine minus PS pump, AC compressor, & alternator. > The crankshaft and camshafts are connected by a timing chain, > not a belt. Toyota has started to go back to timing chains on new engines. > > The oil pump is located behind the timing chain cover at the > front bottom of the engine, even lower than the crankshaft. This is a common arrangement for Toyotas. The oil > pump has > its own short section of chain that's connected to the > crankshaft. Couldn't tell from the picture if this is a second, > dedicated chain, or just part of the larger chain that ascends to > the camshafts. Double overhead cams, don't ya know (DOHC) :-) > > If I had to guess, I'd say the oil pump has its own dedicated > short chain that's separate from the timing chain, ie., camshaft > chain.. F.Y.I., an engine with 4 camshafts like a Toyota V6 or V8 is also referred to as double overhead cams, or DOHC because the nomenclature refers to the cams over each head. Some older Toyota engines (and current domestic engines) have a single overhead cam, or SOHC. -- Ray O (correct punctuation to reply)
From: Built_Well on 15 Jul 2008 01:18 Ray O wrote: > > Some older Toyota engines (and current domestic engines) have > a single overhead cam, or SOHC. ======== Single overhead cam (SOHC)!!!! Well, I guess that's better than using pushrods and rollers.
From: Steve W. on 15 Jul 2008 01:26 Built_Well wrote: > Ray O wrote: >> Some older Toyota engines (and current domestic engines) have >> a single overhead cam, or SOHC. > ======== > > Single overhead cam (SOHC)!!!! Well, I guess that's better > than using pushrods and rollers. WHY? Push rod engines have been around a LONG time. Toyota even agrees as they built more than a few. (take a look under the Tundra V8s hood) -- Steve W.
From: Ray O on 15 Jul 2008 01:02
"Built_Well" <Built_Well_Toyota(a)hotmail.com> wrote in message news:899682da-08dc-42cd-9f1b-2051047899f4(a)x35g2000hsb.googlegroups.com... <snipped> > > Does anyone know why the two Toyota manuals recommend > different oil amounts for the same 2AZ-FE engine? That's > a big half-quart difference. The different oil capacities can be due to different capacities in the oil pans, which are due to different shapes. > > I have always put in 4.25 quarts, instead of the 4.0 > quarts recommended in my manual, but do you think I should > increase it to 4.5 quarts, which would equal the > amount recommended in the new '08 manual? > No. Stick to the recommended amount in your manual. > Frothing probably wouldn't be a problem with that small > amount extra, but you never know. It depends on how excided you get when you add the extra oil. The oil is not going to foam with an extra half quart. -- Ray O (correct punctuation to reply) |