Toyota Motors?

Submitted: Wednesday, Jun 06, 2012 at 10:41
ThreadID: 96060 Views:2872 Replies:4 FollowUps:11
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Whats the difference between the HDT &HDFT Diesel motors internally?


Thanks


Cheers Axle.
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Reply By: lostinwauchope - Wednesday, Jun 06, 2012 at 11:06

Wednesday, Jun 06, 2012 at 11:06
Hi Axle ,
1hdt = 2valves per cylinder . 1hdft = 4 valves per cylinder
cheers ron
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Follow Up By: Axle - Wednesday, Jun 06, 2012 at 11:55

Wednesday, Jun 06, 2012 at 11:55
Thanks Mate.


Axle.
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Reply By: Ron N - Wednesday, Jun 06, 2012 at 13:38

Wednesday, Jun 06, 2012 at 13:38
Axle - A vast increase in complexity! The 4 valve is a great engine while they're going, but when it comes to overhaul, you're looking at a substantial increase in overhaul costs, because of double the amount of moving/wearing components.

Cheers - Ron.
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Follow Up By: Axle - Wednesday, Jun 06, 2012 at 14:22

Wednesday, Jun 06, 2012 at 14:22
Ron, are they both over head cam??


Axle.
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Follow Up By: Madfisher - Wednesday, Jun 06, 2012 at 21:24

Wednesday, Jun 06, 2012 at 21:24
If well serviced they should be good for 600000ks plus .
Cheers Pete
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Reply By: lostinwauchope - Wednesday, Jun 06, 2012 at 15:00

Wednesday, Jun 06, 2012 at 15:00
Yes Axle both over head cam
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Follow Up By: Member - Bruce C (NSW) - Thursday, Jun 07, 2012 at 13:21

Thursday, Jun 07, 2012 at 13:21
Are you really lost in Wauchope???

It is not that big a town you know. LOL.

I am just up the road from you near Telly Point.

Cheers, Bruce
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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Reply By: Member - Bruce C (NSW) - Thursday, Jun 07, 2012 at 12:35

Thursday, Jun 07, 2012 at 12:35
Hi Axle,

I am not completely conversant with the Toyota Landcruiser Diesel motors but having owned 3 cruisers to date gives me some insight.

The designation of
1H relates to the block I think.
D denotes diesel and T for turbo = 1HDT

Same block virtually for the 1HD FT. There may be differences, I am unsure as I have not gone into the manual that deeply.

So
1H = the block

D = Diesel

F = four valves per cylinder and

T = Turbo

In the 100 series they added electronic injection so an E was added to the end
so that the 100 series became

1HD FTE

The reason I think they went to electronic injection is that the injectors or the pump were very noisey. Compare engine noise of the 1HD FT to the 1HD FTE.

The latter are much quieter.

Cheers, Bruce.
At home and at ease on a track that I know not and
restless and lost on a track that I know. HL.

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Follow Up By: Axle - Thursday, Jun 07, 2012 at 18:21

Thursday, Jun 07, 2012 at 18:21
Thanks Bruce,....Just out of interest we lived on Redbank road for a while.

Top Spot.


Cheers Axle.
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Follow Up By: Member - Bruce C (NSW) - Thursday, Jun 07, 2012 at 19:05

Thursday, Jun 07, 2012 at 19:05
You're right there Axle, it is a top spot here on the Mid North Coast.

So much right at your finger tips. Half hour east there is the ocean and a half hour west and you are in the mountains and no traffic to speak of.

I move up this way 27 years ago from Sydney and have never regretted it.

Cheers, Bruce.
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restless and lost on a track that I know. HL.

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Follow Up By: GrumpyOldFart - Friday, Jun 08, 2012 at 20:54

Friday, Jun 08, 2012 at 20:54
Bruce
I think you are 99% right

but

where does the 1HZ fit? same bottom end.

1H = Diesel block
D = Direct injection
Z = indirect injection

Maybe

Rgds
Dru

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Follow Up By: Member - Bruce C (NSW) - Saturday, Jun 09, 2012 at 11:32

Saturday, Jun 09, 2012 at 11:32
Hi Dru (GOF),

That fills in a gap or two and looks about right.

Thanks for the heads up mate.

Cheers, Bruce.
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restless and lost on a track that I know. HL.

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Follow Up By: GrumpyOldFart - Saturday, Jun 09, 2012 at 22:00

Saturday, Jun 09, 2012 at 22:00
Bruce
just so you can show off round the next campfire I have added the following for you
The first numeric character specifies the engine block's generation
The next one or two letters specify the engine family

like this

1967 - H - OHV
???-??? - 3.6 L (3576 cc) H
1980-1990 - 4.0 L (3980 cc) 2H
1986-1990 - 4.0 L (3980 cc) 12HT
1990 - HD - SOHC
1989-1995 4.2 L (4164 cc) 1HD-T
1995-1997 4.2 L (4164 cc) 1HD-FT
1997- 4.2 L (4164 cc) 1HD-FTE
1990 - HZ - SOHC
1989- 4.2 L (4163 cc) 1HZ

The suffix (separated by a dash) specifies the features of the engine:
Suffix Feature
A Valvematic variable lift intake head
B Twin SU-style side-draft carburetors
After 2000 indicates E85 Ethanol fuel.[citation needed]
C Carburated / California Emissions Controlled
D Twin Downdraft carburetors
E Electronic Fuel injection
F Economy narrow-angle valve DOHC
G Performance wide-angle valve DOHC
H High compression
High pressure charged (example: 2L-THE)
I Single-point fuel injection
J Autochoke (Early models) or unknown pollution control
L Transverse
M Philippines' market (meaning unknown)
N CNG fuel
P LPG fuel
R Low Compression (For 87 and below octane fuel)
S Swirl intake (1980s)
SE D-4 Gasoline Direct Injection (1990s)
T Turbocharged
U With Catalytic converter Japan-spec emissions
V Common Rail Diesel Injection (D-4D)
X Atkinson cycle (typically also indicates a Hybrid engine, as Toyota only uses the Atkinson cycle with hybrids)
Z Supercharged

So a 1HD-FTE is 1st generation with a economy narrow angle DOHC, Turbo, and Electronic fuel injection.
I still can't confirm my 1H"D" for direct injection and 1H"Z" for indirect injection though.

enjoy

Dru
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Follow Up By: fisho64 - Sunday, Jun 10, 2012 at 01:10

Sunday, Jun 10, 2012 at 01:10
1HD-FTE is SOHC not double.
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Follow Up By: GrumpyOldFart - Sunday, Jun 10, 2012 at 09:45

Sunday, Jun 10, 2012 at 09:45
Fisho

you are so right

The 1HD-FTE is a SOHC 24 valve. They use a bridge arrangement so 2 valves run off each rocker.

Maybe the translation for "F" should be more like "Economy narrow angle multivalve SOHC"

Thanks for pointing that out

Dru

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