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L20B rebuild
http://ozdat.com/forum/viewtopic.php?f=28&t=33103
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Author:  Ant-Dat [ Mon Sep 22, 2014 4:28 am ]
Post subject:  L20B rebuild

Today I started a rebuild of my L20 from my Ausy spec 1978 200B (810) that I'm planning on fitting into my UK spec 1400

the start :)

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Loading on to engine stand
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about an hour later
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Not actually to bad for a 37 year old engine It's done about 40K miles
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and completely stripped, cleaning in progress

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Then I attacked the inside with a Die grinder
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Next i'll need to take it to get the block machined to fit the new over sized pistons
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Author:  Ant-Dat [ Mon Sep 22, 2014 6:28 am ]
Post subject:  Re: L20B rebuild

looking to build a god street engine with the odd track use.

the pistons are (I think L18) 1mm over size so do have a small dish,
I have a adjustable sprocket, new timing gear, shells and mains, high flow oil pump.
the cam
Cam Specs
Cam Specs

Profile Actuation Make/Model Ratio
733A radius rocker Datsun L4 In 1.55 Ex 1.55

Cam lift Duration Adv Duration Valve Clr Valve Lift Cam Lift TDC Phase
Intake 320 270 220 0.012 0.4836 110
exhaust 320 270 220 0.012 0.4836

Timing Adv Timing @ 050
Open Close Open Close
Exhaust 65 25 42 -2
Intake 25 65 2 38

50 0
Deg Over-Lap Deg Over-Lap
also have set of twin 40's

Author:  Ant-Dat [ Mon Sep 22, 2014 6:32 am ]
Post subject:  Re: L20B rebuild

Now the interesting part
I have 3 cylinder heads
A87
w53
U67

will take some measurements and hopefully with some help the best head can be fitted
Remember in the UK we have 95,97 and 99 ron pump gas :)

Author:  Lurch [ Mon Sep 22, 2014 1:14 pm ]
Post subject:  Re: L20B rebuild

The reasons your pistons are so clean, is because the cylinders have had water in them.

Author:  green200b [ Mon Sep 22, 2014 3:06 pm ]
Post subject:  Re: L20B rebuild

I don't know much about these things but is there a reason you're die-grinding the inside of the block? Is it just for cleaning purposes or something more?

Author:  Ant-Dat [ Mon Sep 22, 2014 4:42 pm ]
Post subject:  Re: L20B rebuild

the head gasket was replaced years ago and I did a de coke of the engine then, but it had done close to 10k before the engine was removed and dry stored.

Author:  Ant-Dat [ Mon Sep 22, 2014 4:54 pm ]
Post subject:  Re: L20B rebuild

green200b wrote:
I don't know much about these things but is there a reason you're die-grinding the inside of the block? Is it just for cleaning purposes or something more?

removing excess metal left over by casting

Author:  yellow1600 [ Mon Sep 22, 2014 6:11 pm ]
Post subject:  Re: L20B rebuild

With regards to the heads, go with the a87 if it's in good nick. This will give a good compression ratio even with the dished pistons. Give it a good port if you want a bit more power.

Author:  Ant-Dat [ Mon Sep 22, 2014 6:22 pm ]
Post subject:  Re: L20B rebuild

A87 is new old stock never fitted
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Author:  unfamilia [ Mon Sep 22, 2014 7:28 pm ]
Post subject:  Re: L20B rebuild

A87 or w53 give the ugly67 a miss

Author:  yellow1600 [ Mon Sep 22, 2014 9:10 pm ]
Post subject:  Re: L20B rebuild

Yeah go the a87, that would be awesome to have in the shed.

Author:  Ant-Dat [ Tue Sep 23, 2014 5:43 am ]
Post subject:  Re: L20B rebuild

Ok 3 heads (I know this is all over the web :) (exhaust ports measured at widest points)
U67 first (which I think won't be getting used, it's seen better days)
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Valves 42 In 35 EX
ports 35 in
outside ex 37 x 28
middle ex 37 x 34

W53
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Valves 42 In 32 EX
ports 36 in (ported)
outside ex 37 x 28
middle ex 37 x 34

A87
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Valves 42 In 32 EX
ports 32 in (ported)
outside ex 37 x 28
middle ex 37 x 34

Noticed that one of the rods has a different number cap guess I'm going to have to watch I don't mix them up

all mains and big ends or marked STD so if I need a crank regrind then should be an issue :)

Author:  Ant-Dat [ Wed Jul 11, 2018 6:35 pm ]
Post subject:  Re: L20B rebuild

Hope everyone is well?
sorry for digging up an old thread (hope you guys enjoy)
Due to family health issues i havn;t done much in the way of my car collection but that's slowly changing (for the better :) ).
A little update on my L20B
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Managed to get the dipstick pipe off the L14 (from 510) and fitted to L20B. Also got the sump and pickup pipe (its in cleaner at the moment)

Author:  Ant-Dat [ Wed Jul 11, 2018 8:24 pm ]
Post subject:  Re: L20B rebuild

Sorry guys having some issue with displaying the new images, Hope to get it sorted shortly

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