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L18 block questions


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#1 Giljr2

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Posted 22 November 2017 - 08:07 PM

I just bought a 1975 Datsun 620 and it has an L18 and it has a stamp that is
L18 490560 w
And next to the driver side motor mount it says
M2
The head is a w53 which I’ve read is desirable
And it has a cam that has a stamp on the end 272 and u20
Please help me I want to know what I have
In this isn’t from this truck and I am wanting to find out what I actually have

#2 datzenmike

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Posted 22 November 2017 - 08:25 PM

Only the '74 620 truck, the '74 710 and the 73 610 got the L18.

 

I think the M2 is a much later casting. This is likely an import engine. Take a look at the block vent. It's under the intake on the side of the block. It's a metal pipe with a rubber hose going to the PCV valve on the intake near the carb base. L16/18 came straight out from the side. Later made import L18s and all L20Bs exit vertically.

 

The other thing is the W53 head. It's a domestic Japanese head used for L16/18s with fuel injection. The tops of the intake ports will have notches for the fuel injection nozzles. This would have come with the L18 block.

 

Here's a conventional L16/18...

 

wEYnx4M.jpg


Posted Image

#3 Giljr2

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Posted 22 November 2017 - 08:45 PM

how can i add images to show you?



#4 datzenmike

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Posted 22 November 2017 - 09:05 PM

You'll need to open a (free) photo hosting site account such as imgur, although there are many others as good, but NOT Photobucket. Up load your pictures there and copy the image location, come here to Ratsun and click the green rectangle with the green border around it just below the smiley face above your post. Follow the directions and paste it there and there you are.


Posted Image

#5 Giljr2

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Posted 22 November 2017 - 09:16 PM

https://imgur.com/4H5Cu6z
https://imgur.com/5zMv7gD
https://imgur.com/A3D4Wwh
https://imgur.com/AGBUksK
https://imgur.com/lCoEQUj
https://imgur.com/MoSKMYd
https://imgur.com/I9g7E5h
https://imgur.com/9mPvLoN
https://imgur.com/kRPStwA
https://imgur.com/CytV0hi


#6 Giljr2

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Posted 22 November 2017 - 09:19 PM

http://gilrosas.imgur.com

sorry this one should show all



#7 Crashtd420

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Posted 22 November 2017 - 09:26 PM

I just bought a 1975 Datsun 620 and it has an L18 and it has a stamp that is
L18 490560 w
And next to the driver side motor mount it says
M2
The head is a w53 which I’ve read is desirable
And it has a cam that has a stamp on the end 272 and u20
Please help me I want to know what I have
In this isn’t from this truck and I am wanting to find out what I actually have


Looks like you got lucky... the w53 is a nice head... i have one on my l16..
the 272 is probably a cam grind spec...
In The pic you posted it looks like some upgraded parts on the valves....
Probably has upgraded valve springs too if I had to guess....

#8 wayno

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Posted 22 November 2017 - 09:27 PM

4H5Cu6z.jpg


 

 


#9 Giljr2

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Posted 22 November 2017 - 09:32 PM

Looks like you got lucky... the w53 is a nice head... i have one on my l16..
the 272 is probably a cam grind spec...
In The pic you posted it looks like some upgraded parts on the valves....
Probably has upgraded valve springs too if I had to guess....

 awesome i was hoping for some goodknews but iv been wanting to know more about this engine but can't find any info on it:(



#10 Giljr2

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Posted 22 November 2017 - 09:32 PM

Only the '74 620 truck, the '74 710 and the 73 610 got the L18.

 

I think the M2 is a much later casting. This is likely an import engine. Take a look at the block vent. It's under the intake on the side of the block. It's a metal pipe with a rubber hose going to the PCV valve on the intake near the carb base. L16/18 came straight out from the side. Later made import L18s and all L20Bs exit vertically.

 

The other thing is the W53 head. It's a domestic Japanese head used for L16/18s with fuel injection. The tops of the intake ports will have notches for the fuel injection nozzles. This would have come with the L18 block.

 

Here's a conventional L16/18...

 

wEYnx4M.jpg

 my block doesn't look like that it has a removable tube that is vertical 



#11 wayno

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Posted 22 November 2017 - 09:34 PM

Looks like a W53 head to me, it has them weird runners in #1 and #2 intake ports.

It also looks like the intake/exhaust face was machined, I have never had to do that to any head I have ever owned, I wonder why it was machined?


 

 


#12 Giljr2

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Posted 22 November 2017 - 09:37 PM

Looks like a W53 head to me, it has them weird runners in #1 and #2 intake ports.

It also looks like the intake/exhaust face was machined, I have never had to do that to any head I have ever owned, I wonder why it was machined?

yeah idk what that is in #1 #2 intake ports and I'm not sure honestly but if you can look at the pictures iv uploaded and tell me what you may know about them i would gladly appreciate it! 



#13 Crashtd420

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Posted 22 November 2017 - 09:43 PM

my block doesn't look like that it has a removable tube that is vertical


Probably looks more like this...
My L16 with a w53 ...

20160628_164212.jpg

#14 Giljr2

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Posted 22 November 2017 - 09:46 PM

Probably looks more like this...
My L16 with a w53 ...

20160628_164212.jpg

yes it looks VERY SIMILAR! But Mines anL18 



#15 Crashtd420

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Posted 22 November 2017 - 09:50 PM

So is the l18 in the vehicle?
Is that head the one from the motor?
The other thing that would be good to know is pistons.... if you have flat tops you have a real nice combo....
So if heads off look at the piston.. or look through spark plug hole...

#16 wayno

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Posted 22 November 2017 - 09:52 PM

yes it looks VERY SIMILAR! But Mines anL18 

As Dmike said, later L18s have the case vent like the L20b, so you appear to have a late L18 block.


 

 


#17 Giljr2

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Posted 22 November 2017 - 09:57 PM

So is the l18 in the vehicle?
Is that head the one from the motor?
The other thing that would be good to know is pistons.... if you have flat tops you have a real nice combo....
So if heads off look at the piston.. or look through spark plug hole...

i took the L18 out and i believe they are flat top pistons out of a L28 280Z so idk really what that means



#18 Giljr2

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Posted 22 November 2017 - 09:58 PM

As Dmike said, later L18s have the case vent like the L20b, so you appear to have a late L18 block.

is having a late L18 Block a good thing?



#19 wayno

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Posted 22 November 2017 - 10:10 PM

Has this engine ran in your possession?

I have recently put together an engine with flat top pistons and a W53 closed chamber head, it supposedly has a 10.9 compression ratio and has to be set up nearly perfect to run, otherwise it is going to knock badly.

L18 blocks are supposed to be revers, I had an L16 once back in the mid 90s, I will never have any L block smaller than an L20b, but I have never had a running L18 to compare it to a running L20b either.


 

 


#20 Giljr2

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Posted 22 November 2017 - 11:47 PM

Has this engine ran in your possession?

I have recently put together an engine with flat top pistons and a W53 closed chamber head, it supposedly has a 10.9 compression ratio and has to be set up nearly perfect to run, otherwise it is going to knock badly.

L18 blocks are supposed to be revers, I had an L16 once back in the mid 90s, I will never have any L block smaller than an L20b, but I have never had a running L18 to compare it to a running L20b either.

not in my possession but the guy i bought iy has tripped the spark plug and got it help coiled then stripped and he got fed up, but ik the guy so i trust he is telling the truth, he did say it has to run premium fuel and what exactly needs to be set up nearly perfect? and are they suppose to be revers?