Some details of the 2AZ-FE engine

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.

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."

Since the manual doesn't mention what the cylinder head, itself,
is made of, I will assume iron, but just an assumption.

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?

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.?

The crankshaft and camshafts are connected by a timing chain,
not a belt.

The oil pump is located behind the timing chain cover at the
front bottom of the engine, even lower than the crankshaft. 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..

Did I say frothing? I meant foaming--oil foaming.

The 2AZ-FE engine in both the '06 and '08 Camrys
is 2.4 liters.

On Jul 15, 10:41 am, Hachiroku $B%O%A%m%/(B <Tru...@e86.GTS> wrote:
> On Mon, 14 Jul 2008 20:08:50 -0700, Built_Well wrote:
> > 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."
>
> Yeah, that's the valve cover...
>
>
>
> > Since the manual doesn't mention what the cylinder head, itself,
> > is made of, I will assume iron, but just an assumption.
>
> Toyotas have been using aluminum heads for as long as I can remember. My
> first Corolla, a '74, had an iron block and aluminum heads, which worked
> well for them, but was a fatal combination for certain Chevy (VEGA) models...

IIRC it was backwards... the Vega had an aluminum block with an iron
head. This was back in the day before the Nikasil and similar
processes were perfected, and I am guessing that simple piston/bore
wear was the cause of most of the mosquito fogging action that the
Vegas were famous for. I remember when I was a kid the neighbors
across the street had one and it would lay one heck of a smokescreen.
Was an attractively styled little car but the engines were definitely
a weak link.

I believe that John DeLorean addressed some of the engineering mishaps
in the Vega's development in his book, but it's been years since I
read it so I'm a little furry on the details.

nate

On Jul 15, 7:47 am, "C. E. White" <cewhi...@remove>
wrote:
> "Hachiroku $B%O%A%m%/(B" <Tru...@e86.GTS> wrote in message
>
> news:pan.2008.07.15.14.41.47.208604@e86.GTS...
>
>
>
>
>
> > On Mon, 14 Jul 2008 20:08:50 -0700, Built_Well wrote:
>
> >> 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."
>
> > Yeah, that's the valve cover...
>
> >> Since the manual doesn't mention what the cylinder head, itself,
> >> is made of, I will assume iron, but just an assumption.
>
> > Toyotas have been using aluminum heads for as long as I can
> > remember. My
> > first Corolla, a '74, had an iron block and aluminum heads, which
> > worked
> > well for them, but was a fatal combination for certain Chevy (VEGA)
> > models...
>
> Actually Vegas had aluminum blocks and cast iron heads! One of the
> stangest combinations ever. The original Vega block was the linerless
> aluminum type and was die case with an open top deck. The aluminum
> alloy had a lot of silicon in it .The theory was that the aluminunm
> would wear away slightly, exposing the silicon surface, which would
> prevent (or at least slow down) further bore wear. The block was very
> light and not particulalry stiff which is why they used a cast iron
> cylinder head to provide the stiffness absent from the block. I
> suppose the test engines all worked well. Unfortunately, in the real
> world, things did not work so well. The whimpy blocks couldn't take
> any "normal" abuse. The slightest overheating would lead to rapid bore
> wear and significant oil consumption. Hard driving would cause block
> distortions which also led to rapid bore wear and significant oil
> consumption. Poor maintenance practices led to rapid bore wear and
> significant oil consumption. Etc. Essentially driving the car led to
> rapid bore wear and significant oil consumption. But it often was not
> much of a problem since rust usually ate the body away before oil
> consumption was too bad. Body rustwas not a problem restricted to
> Vegas by the way. Toyotas of the era were at least as prone to rusting
> away.
>
> BTW, Porsche and Mercedes use the linerless aluminum blocks that GM
> tried on he Vega. But even today, you don't want to overheat an engine
> using that technology.
>
> Ed

Thanks for confirming that my memory isn't completely shot :)

FWIW the all-aluminum engine in my 944 leaks more oil than it burns
AFAICT. I seem to have a penchant for attracting vehicles that aren't
known for gasket integrity :(

Rust seems to be a common theme with cars from the mid-70s and older.
The same neighbors that had the Vega also had a Volare wagon, the
front fenders were rusted through in only a couple of years. My dad's
Oldsmobile fared a little better, but it still had rusty fenders,
possibly because of some collision repair early in its life (was
sideswiped in a snowstorm on a windy country road by another driver
who lost control of her car) Once the Germans started using
galvanized body panels and that waxy undercoating the problems pretty
much went away (my mom's Golf lasted almost 20 years in semi-rural PA
before any significant corrosion showed up) I don't know about newer
American cars but I would assume that they've taken similar measures.

nate

I think it was Buick. Had an Aluminium engine in something like '62.
V8, I think it was 300 ci. I did a brake job on one of those cars once
and really liked driving it. So when I gave it back to the girl that
owneed it I tried to explain that it was of utmost concern that this
car NEVER be over heated. Always check coolant and have a GOOD
radiatoer, fan belt, water pump, etc....One year later she was trying
to sell it to me because "We think it's only the head gasket". Right.
Aluminium warps really good.

disston

The 2AZ-FE has a variant 2AZ-FXE for hybrid cars.

By the way, the supercharged 2AZ-FE's found on some of the Scion tC,
are there other modifications on the engine or just added the super
charger? Would you be able to fit a supercharger on a camry, rav4 or
highlander?

On Jul 14, 11:34 pm, "Ed White" <cewhi...@> wrote:
> "Built_Well" <Built_Well_Toy...@m> wrote in message
>
> news:97101848-da38-42b3-88d7-6dcb0def23b9@s50g2000hsb..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)
>
> Advanced, in what way? Lots of comparable engines from many manufacturers. I
> have a hard time thinking of any engine that requires routine valve
> adjustment as "advanced." But I guess that is also a trend these days. And
> since most people ignore the routine valve clearance checks, I guess it is
> irrelevant. I was shocked when I found out my Nissan Frontier requires valve
> adjustment. You have to love the chutzpa of the Nissan engineers. The engine
> in my Frontier requires valve adjustment only when the valve noise is
> objectionable. It is going to be damn loud before I'll spend hundreds (maybe
> thousands) to have the valves adjusted. I assume the engineers at Nissan
> (and Toyota) have designed the valve system so that the valve clearance
> increases with wear - else you run the risk of burning valves if the
> clearance goes too low (learned from sad experience on older engines).
>
> > is the same engine that was used in the '01 Highlander SUV.
> > 5th Generation Camrys cover Model Years '02 - '06.
>
> It is still used today in Camrys, RAV4s, and ?
>
>
>
> > 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."
>
> > Since the manual doesn't mention what the cylinder head, itself,
> > is made of, I will assume iron, but just an assumption.
>
> Nope, it is aluminum.
>
> > 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?
>
> Nope, but be sure to use the recommended 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.?
>
> Everything that makes up the main engine assembly (block, pistons, heads,
> cams, etc.) but no oil or water. Probably does not include accesorries
> (alternator, starter). May or may not include intake system. Probably
> includes intake to the throttle body.
>
> > The crankshaft and camshafts are connected by a timing chain,
> > not a belt.
>
> Common practice these days. Cam belts are mostly on the way out for modern
> engines.
>
> > The oil pump is located behind the timing chain cover at the
> > front bottom of the engine, even lower than the crankshaft. 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.
>
> Completely separate chain (referred to as the No. 2 Chain Sub-assembly).
>
> > 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..
>
> Correct.
>
> Ed

Is the 2AZ-FE considered a direct injection engine?

On Tue, 15 Jul 2008 06:16:02 -0700, N8N wrote:

> On Jul 15, 7:47 am, "C. E. White" <cewhi...@remove>
> wrote:
>> "Hachiroku ��ロク" <Tru...@e86.GTS> wrote in message
>>
>> news:pan.2008.07.15.14.41.47.208604@e86.GTS...
>>
>>
>>
>>
>>
>> > On Mon, 14 Jul 2008 20:08:50 -0700, Built_Well wrote:
>>
>> >> 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."
>>
>> > Yeah, that's the valve cover...
>>
>> >> Since the manual doesn't mention what the cylinder head, itself,
>> >> is made of, I will assume iron, but just an assumption.
>>
>> > Toyotas have been using aluminum heads for as long as I can
>> > remember. My
>> > first Corolla, a '74, had an iron block and aluminum heads, which
>> > worked
>> > well for them, but was a fatal combination for certain Chevy (VEGA)
>> > models...
>>
>> Actually Vegas had aluminum blocks and cast iron heads! One of the
>> stangest combinations ever. The original Vega block was the linerless
>> aluminum type and was die case with an open top deck.

<SNIP!>

>> Ed
>
> Thanks for confirming that my memory isn't completely shot :)
>
> FWIW the all-aluminum engine in my 944 leaks more oil than it burns
> AFAICT. I seem to have a penchant for attracting vehicles that aren't
> known for gasket integrity :(
>
> Rust seems to be a common theme with cars from the mid-70s and older.
> The same neighbors that had the Vega also had a Volare wagon, the
> front fenders were rusted through in only a couple of years. My dad's
> Oldsmobile fared a little better, but it still had rusty fenders,
> possibly because of some collision repair early in its life (was
> sideswiped in a snowstorm on a windy country road by another driver
> who lost control of her car) Once the Germans started using
> galvanized body panels and that waxy undercoating the problems pretty
> much went away (my mom's Golf lasted almost 20 years in semi-rural PA
> before any significant corrosion showed up) I don't know about newer
> American cars but I would assume that they've taken similar measures.
>
> nate

And, thanks to both of you for correcting me! I knew an iron
block/aluminum head works, since Toyota did it for so long, but I had
forgotten the reversal on the Vega. Like nate said, nice little car, but
what an abortion! If chevy had gotten it right it would have been an
import fighter for sure. Looks, OK handling, etc.

The few who got the Cosworth version were the lucky ones!

Hee hee hee. 2AZFE "an advanced powerplant?" that's a good one.
Checkout the Audi FSI 2.0T for an advanced design with a flat torque
curve from 2000-5000 RPMs.

On Jul 14, 8:08 pm, Built_Well <Built_Well_Toy...@m> wrote:
> 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.

Hachiroku $B%O%A%m%/ wrote:
> On Tue, 15 Jul 2008 06:16:02 -0700, N8N wrote:
>
>> On Jul 15, 7:47 am, "C. E. White" <cewhi...@remove>
>> wrote:
>>> "Hachiroku ��ロク" <Tru...@e86.GTS> wrote in message
>>>
>>> news:pan.2008.07.15.14.41.47.208604@e86.GTS...
>>>
>>>
>>>
>>>
>>>
>>>> On Mon, 14 Jul 2008 20:08:50 -0700, Built_Well wrote:
>>>>> 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."
>>>> Yeah, that's the valve cover...
>>>>> Since the manual doesn't mention what the cylinder head, itself,
>>>>> is made of, I will assume iron, but just an assumption.
>>>> Toyotas have been using aluminum heads for as long as I can
>>>> remember. My
>>>> first Corolla, a '74, had an iron block and aluminum heads, which
>>>> worked
>>>> well for them, but was a fatal combination for certain Chevy (VEGA)
>>>> models...
>>> Actually Vegas had aluminum blocks and cast iron heads! One of the
>>> stangest combinations ever. The original Vega block was the linerless
>>> aluminum type and was die case with an open top deck.
>
> <SNIP!>
>
>>> Ed
>> Thanks for confirming that my memory isn't completely shot :)
>>
>> FWIW the all-aluminum engine in my 944 leaks more oil than it burns
>> AFAICT. I seem to have a penchant for attracting vehicles that aren't
>> known for gasket integrity :(
>>
>> Rust seems to be a common theme with cars from the mid-70s and older.
>> The same neighbors that had the Vega also had a Volare wagon, the
>> front fenders were rusted through in only a couple of years. My dad's
>> Oldsmobile fared a little better, but it still had rusty fenders,
>> possibly because of some collision repair early in its life (was
>> sideswiped in a snowstorm on a windy country road by another driver
>> who lost control of her car) Once the Germans started using
>> galvanized body panels and that waxy undercoating the problems pretty
>> much went away (my mom's Golf lasted almost 20 years in semi-rural PA
>> before any significant corrosion showed up) I don't know about newer
>> American cars but I would assume that they've taken similar measures.
>>
>> nate
>
>
> And, thanks to both of you for correcting me! I knew an iron
> block/aluminum head works, since Toyota did it for so long, but I had
> forgotten the reversal on the Vega. Like nate said, nice little car, but
> what an abortion! If chevy had gotten it right it would have been an
> import fighter for sure. Looks, OK handling, etc.
>
> The few who got the Cosworth version were the lucky ones!
>
>

Considering that the Vega was an imported design (Opel) It wasn't a bad
car. Between my uncles and closer family we owned about 8 of them (and
more than a couple Monzas as well). The later Durabilt engines with the
steel liners held up pretty well. The front subframe to body plates is
the place to look for real rot on them. If it's gone walk away unless
the rest of the body is mint.
--
Steve W.
Near Cooperstown, New York