1uz non vvti Block differences between Series 1 and series 2
Summary
TLDRIn this video, Calvin from the Catching Company in New Zealand, along with Jason, discusses the differences between Toyota's Gen 1 and Gen 2 engine blocks, specifically focusing on the 1UZ-FE engine. They highlight the changes in block casting, including the introduction of holes in the Gen 2 block for weight reduction and potential harmonic improvements. The discussion also touches on the transition from thick to thin connecting rods and the lighter pistons and crankshaft in Gen 2 engines. The hosts compare various engine components, noting similarities and differences, and speculate on the reasons behind Toyota's design choices without definitive answers, inviting viewer input and further exploration.
Takeaways
- 🔧 The main difference between a Gen 2 and a Gen 1 block is the presence of additional holes in the Gen 2 block, which makes it lighter.
- 📅 The transition from Gen 1 to Gen 2 blocks occurred around the 9th month of 1994, with the changes appearing in the USA market in 1995.
- 🏎️ The Gen 2 block was introduced alongside lighter connecting rods and pistons, enhancing engine performance.
- 🔩 The change from Gen 1 to Gen 2 is marked by the switch from thick to thin connecting rods, which is also seen in the LS400s and SC400s models.
- 🏭 The block casting for both Gen 1 and Gen 2 is believed to be the same, with modifications made for specific engine components.
- 🔧 The Gen 3 or VVT-i blocks further lightened the crankshaft by 1.5 kg and modified the oil galleries.
- 🧐 The additional holes in the Gen 2 block are speculated to be for block harmonics or windage pressure, although this is not confirmed.
- 🔍 The script suggests that the Gen 2 block is preferred by some dirt track Speedway racers due to its design.
- 📏 The block's underside has distinguishing features, such as the presence of holes, which are not found in the Gen 1 block.
- ⚙️ The script highlights the importance of matching bearing sizes when rebuilding engines, as indicated by markings on the blocks.
Q & A
What is the main difference between a Gen 1 and Gen 2 engine block in Toyota's 1UZ series?
-The main difference is the presence of additional holes in the Gen 2 block, which makes it lighter.
Why did Toyota introduce changes in the engine block design from Gen 1 to Gen 2?
-Toyota made changes to improve the engine's performance, specifically by introducing lighter rods and pistons.
In which year did the change from Gen 1 to Gen 2 engine blocks occur in the USA market?
-The change occurred in the USA market in 1995, registered as 95 year models.
What is the significance of the additional holes in the Gen 2 engine block?
-The additional holes are believed to be for either weight reduction or to change the harmonics of the block.
Is there a difference in the oiling and water holes between Gen 1 and Gen 2 engine blocks?
-No, the oiling and water holes in the top of the engine blocks appear to be the same between Gen 1 and Gen 2.
What are the differences in the main cap design between Gen 1 and Gen 2 engine blocks?
-The Gen 2 has chamfering and no recess, while the Gen 1 has a flat edge with recesses.
What is the purpose of the numbers found on the engine blocks?
-The numbers indicate the bearing sizes fitted at the factory, which can vary and are not necessarily the same across all engine blocks.
Why might some engine blocks have different numbers indicating bearing sizes?
-The different numbers could be due to mass production machining differences, where the factory adjusts the bearing sizes to meet specific tolerances.
Are there any differences in the block casting between the VVT-i and non-VVT-i versions of the 1UZ engine?
-The VVT-i block casting is almost the same as the non-VVT-i, but it has modifications for the oil galleries.
What is the significance of the bolt-on drain in the engine blocks?
-The bolt-on drain is an additional feature compared to the Gen 1 block and is part of the block's design for oil management.
Outlines
🔧 Differences Between Gen 1 and Gen 2 Toyota Blocks
The first paragraph discusses the differences between Toyota engine blocks, specifically the Gen 1 and Gen 2. The speaker, Calvin from a New Zealand catching company, explains that the Gen 2 block has additional holes, making it lighter. These changes were introduced in the LS400s and CLC models around September 1994, with the Gen 2 featuring thinner rods and pistons. The block castings for Gen 1 and Gen 2 are largely the same, with the main difference being the presence of holes in the Gen 2 block. The discussion also touches on the sequential ECU and the transition from Gen 1 to Gen 2 in terms of engine components like rods and crankshafts.
🏋️♂️ Detailed Comparison of Engine Block Castings
In the second paragraph, the focus is on a detailed comparison of the engine block castings. It is noted that the top of the blocks, including the oiling and water holes, are similar between Gen 1 and Gen 2. However, the underside of the blocks reveals the presence of additional holes in the Gen 2 block, which may be related to windage pressure or block harmonics. The speaker speculates that these changes could be due to a desire for lighter components or to adjust the harmonics of the engine block. The discussion also includes observations on the main cap design differences and the presence of matching holes that are not part of the casting itself.
🔩 Engine Block Markings and Bearing Specifications
The third paragraph delves into the markings found on the engine blocks, which are related to the bearings fitted at the factory. These markings indicate different bearing sizes, which can vary from block to block. The speaker mentions that these markings can be confusing for those who are not familiar with them, but they are essential for ensuring the correct bearings are used during engine assembly. The conversation also touches on the importance of using genuine parts and the potential issues that can arise from using aftermarket bearings with different specifications. The paragraph concludes with a note on the practicality of identifying block differences and the value of such knowledge.
Mindmap
Keywords
💡Gene One Block
💡Gene Two Block
💡Block Casting
💡Camshaft
💡Crankshaft
💡VVT-i
💡Main Bearings
💡Bore Thickness
💡Oil Galleries
💡Windage
Highlights
Difference between gene two and gene one block is the set of holes
Gene two block has extra holes, making it lighter
Main cap design differs between gene one and gene two
Toyota released an upgraded block in 1994 for the USA market in 1995
Upgraded block has lighter rods and pistons for better performance
Change from thick to thin rods occurred in 1994 for LS400s and CLCs
Sequential ECU introduced with wider body for SC 400s
Gen 1 and Gen 2 engines have almost identical crankshafts
Gen 3 engines have a lighter crankshaft by 1.5 kilos
VVT-i engines have modified block casting for oil galleries
Gen 1 and Gen 2 blocks likely came from the same casting
Discussion on Facebook about block casting differences
Gen 1 block has corrosion and pitting, deemed scrap
Gen 2 block stripped from an engine for comparison
No difference in oiling and water holes between Gen 1 and Gen 2
Ribbing and block mounting points are the same in both generations
Difference in holes underneath the block between Gen 1 and Gen 2
Cap design differences noted between Gen 1 and Gen 2
Extra holes in Gen 2 block possibly for block harmonics
1UZ VVT-i block also has the same holes as Gen 2
Discussion on why extra holes were added in Gen 2 blocks
Bolt-on oil gallery knock senses are a feature of Gen 2 blocks
Numbers on blocks related to bearing sizes at the factory
Importance of matching bearing sizes when replacing
Useless information provided for educational purposes
Transcripts
the difference between a gene two
and a gene one block
is these set of holes here
so there
that means change extra holes in it
we'll also see the main cap see the
design of the main kit though that isn't
part of the block casting is it this is
casting so that that is our difference
there
but you'll see here the the design here
we've got
Reese's
no recess in a different shape so that's
the quick version of Gene one block Gene
two block
s through the box
good question isn't it what is it for
well I'm going over to camshaft on the
bottom
yeah
get it guys it's Calvin
from the catching company in New Zealand
oh and Jason and Jason too both of us
and we were just we were fortunate
enough to have lots of bits lying around
and so sit them next to each other so we
can compare and share some of the
knowledge which is kind of disappearing
on this older stuff Toyota at some point
would have done a release and said hey
the block on the one you zdfe and the
1994 relief production year
released in the USA in 1995 it had this
upgrade at the block has been changed to
improve something
and it's because they put some holes in
it or it's a lighter block
which it is a lighter block because it's
got some holes in it
so to Define
series one and series two or gen 1 and
Gen 2 use it
it's the change between the thick rods
and the thin rods
and this happened in the ls400s and the
CLC is around about uh it was the ninth
month of 1994 to be exact but in the USA
you'll see it in uh
registered 95 so 95 year 95s model year
also happened in the soras SC 400s when
they went to the sequential ECU which is
the wider body ECU
then the crowns the 131 and the 141 were
gen 1 and the 151 non-vtiser Gene 2.
and so not only did Toyota that's when
Toyota put the
lighter rods and the lighter pistons in
which Reeve better in an inner form
so that's what we mean when we go Gene
two engines got the one with the load of
rods and motorists crankshaft
pretty much identical it's probably
easier just to say they are the same
crank
um they are different part numbers
but it's very hard to tell the
difference between the two
it is the gene threes or the vvtis where
they lighten the crank by one and a half
kilos but we're focusing on the block
casting
the vvti's block casting is is almost
the same but of course they've modified
it for the oil galleries for the vvti
threeuz they put a bigger hole in it but
all this the same casting and the Gen
one and gen 2 blocks
I believe came from the same casting
so
I actually asked on a Facebook post and
if there was a difference
and some guys were brave enough to
actually say no there's no difference
even though they're wrong that's a
pretty brave move
uh but
the a lot of guys were guessing and I
had some pictures
um and I asked specifically on the block
casting not into the VVT ice but
specifically on the block casting
between a gene one and a gene 2.
[Music]
this is a gen one
it does look like it's been under the
sea because I would almost say that
these corroded just about through the
oil gallery knock senses are a bolt on
and we haven't removed them because this
block is scrap that's going to rubbish
it's got massive pitting in the walls
this is 100 a Gen 2 block stripped from
a Gen 2 engine
[Music]
some people suggested there was a
difference in
the holes in the top
you know I can see no difference between
the oiling and the water holes in the
top
between the two engines I can't see any
shapes of the saw the same
I believe the bores the sleeves are the
same
in here all the ribbing is the same all
the same block mounting points exist
certainly on the front
everything is the same there as well and
all accessories bolt on
down the sides
they are the same though have you seen
the ones that don't have the holes
so these holes here
foreign
and are used on the crown the 131 Crown
to mount
uh the oilfield housing
some blocks don't have that tapped so
that could actually be seen as a
difference but it's not between Gene one
and Gene 2.
it's specific to some
some models that seem to randomly not
have them tapped
other side
I was in such a hurry today I didn't
even managed to get my workflix on
we just uh try not to smash the torch
same thing here
same thing along here
they're all the same so the difference
comes in The Underneath
rolly Rolly Polly but this is a gene one
this is the gene one
you go back here
and there is no hole board in that
location there
no wrong
it's there oh sorry is it look oh yes
okay yeah
yes it's there sorry that location there
that's where the holes board and it
continues
on the Gen 2
through single one two three four five
so it goes through number five
through number four number three
but not number two
so I was thinking possibly for windage
pressure
between
um
the compartments of the engine but it
doesn't make sense not to put it through
the front one
if we look at the cap design we do see a
difference
we've got some chamfering
and we've got
no recess it's flat on the edges in here
we still have the place for some oil to
get into the thrust washers
whereas these ones are square
and
got some recesses
and a big recess in here still the same
oil ports for the thrust washer or
places where all can get in
but it comes down to these these holes
is the main one and of course this isn't
part of the casting it's just
interesting to note because they are
matched with the block
and I haven't compared if it changed
part way through the teens but I suspect
that's a 20 only
and we have the hole there there and
there
I actually think
um
it's it's to do with either they were
going for lighter so they found
somewhere but I actually think it was to
do with block harmonics
this is my guess
something to do with the different
reciprocating Mass change the harmonics
of the block slightly and that's how
they solve the problem
possibility
correct I need to find a Toyota engineer
who worked on these and can tell us why
on the gentose
they made those couple of changes
and interesting enough guys we do have a
1uz vvti block here
and it does have those same holes I
can't tell you on the 3z we didn't check
all right if I checked I didn't remember
um hey I'd love to hear some thoughts on
what you guys think of why they put
those extra holes in if anyone's got any
documentation I would love to see that
we're actually working on a video too on
the
the bore thickness and the material
between the cylinders on a 3z
and this one actually fits in really
nicely with that
um
we could always say that the drain
is different too but it's a bolt-on
oh
it has a bolt on it's an extra compared
to the gene one
it's definitely that whole
the reason I found out about this
actually is is because the stock carbo
is the dirt track Speedway guys
some of them
seek that Gen 2 block
and
that is where this one is distant it's
got some Rust marks but it's going to be
bored and probably make about 500
horsepower in a when it's finished
few other interesting things to note on
these blocks too is a series of numbers
and this is to do with the bearings
has to do with the big end bearings that
are fitted
and I believe these ones are to do with
the main bearings that are fitted so
they they aren't someone afterwards that
is actually done at the factory that's
scribbling on the Block
oh see this has got a 2223
and this is where we've got a two two
two
so it's got a a three bearing size three
on the back
upper is that the that's the upper a
that's the lowest that's the upper so
it's got one bearing size different
on that one
um
so quite a different set of bearings
I think you'll find most titles
we have that stamp on the walls yeah
yeah
um it kind of freaks people out a little
bit or they question it when they get a
block and they pull it apart they think
it's a virgin
and there's some numbers on it like that
they're like What's what is it what are
these numbers yeah
of course we work on lots of Toyotas so
we we're quite used to it just like yeah
and then you get a set of aftermarket
bearings and you put them the same size
everywhere
which can get you out which can catch
you out yeah did your engine have
you mix it all up your bearings and it
was all the same or not
uh this this might have got a new cranks
are not everything was all good I just
like it was machinists cool
yeah
but yeah it's got all sounds like rooms
in it yeah and of course that was just
to allow for Machining
Mass Production Machining differences so
they must have had someone at the
factory actually measuring
bearing clearances and going no that
one's not quite right
you can't just go to toilet you've got
to buy if you're buying genuines yeah
buying genuines you want to buy say if
you have a block and it was like two
four three two you're gonna buy Six
appearance
yep
I think it's quite expensive quite
quickly yes
so I hope that's been helpful a bit of
useless information
but if you had to tell the blocks apart
it is possible to do that talk to you
soon catch you later
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