Ozdat Home Feature Cars Ozdat Classifieds Event Calander Links Trade Link Tech Resource Merchandise Donate Web Mail
It is currently Tue Nov 13, 2018 8:53 am

All times are UTC + 10 hours [ DST ]




Post new topic Reply to topic  [ 14 posts ] 
Author Message
 Post subject: L20B rebuild
PostPosted: Mon Sep 22, 2014 4:28 am 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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 :)

Image
Loading on to engine stand
Image
Image
Image

about an hour later
Image
Image
Image

Not actually to bad for a 37 year old engine It's done about 40K miles
Image
Image
Image
Image

and completely stripped, cleaning in progress

Image
Image
Image
Image
Image
Image
Image

Then I attacked the inside with a Die grinder
Image
Image
Image


Next i'll need to take it to get the block machined to fit the new over sized pistons
Image


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 6:28 am 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 6:32 am 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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 :)


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 1:14 pm 
Offline
Site Admin
User avatar

Joined: Sun May 25, 2003 6:54 pm
Posts: 2475
Location: In my Den of Rust & Sin
The reasons your pistons are so clean, is because the cylinders have had water in them.

_________________
Classic Auto Fabrications:
viewtopic.php?f=38&t=31659

http://www.lescollinsracing.com/


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 3:06 pm 
Offline
Donating Member
User avatar
Donating Member

Joined: Wed Dec 05, 2007 2:21 pm
Posts: 3181
Location: Blackburn, Victoria.
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?

_________________
green200b - aka Alistair

The fleet:
'80 200B GX - the green200b - hibernating
'81 RX-7 - 12A turbo, coilovers, 4.11 Torsen LSD - daily
'74 RX-2 - 13B bridgeport, 4.44 LSD - cruiser
'82 Hilux - 350 Chev, 4.3 Detroit Locker, 33s - 4WD

Dato200B wrote:
Green200B has forgotten more about 200Bs than we will ever know.


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 4:42 pm 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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.


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 4:54 pm 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 6:11 pm 
Offline
User avatar

Joined: Fri Nov 23, 2007 6:01 pm
Posts: 402
Location: The Rock, NSW
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.

_________________
Chris Thomas

1971 1600, mild L18, 5 speed

All I want is less to do, more time to do it and higher pay for not getting it done.


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 6:22 pm 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
A87 is new old stock never fitted
Image


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 7:28 pm 
Offline
User avatar

Joined: Wed Mar 05, 2003 8:38 pm
Posts: 1141
Location: straya
A87 or w53 give the ugly67 a miss


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Mon Sep 22, 2014 9:10 pm 
Offline
User avatar

Joined: Fri Nov 23, 2007 6:01 pm
Posts: 402
Location: The Rock, NSW
Yeah go the a87, that would be awesome to have in the shed.

_________________
Chris Thomas

1971 1600, mild L18, 5 speed

All I want is less to do, more time to do it and higher pay for not getting it done.


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Tue Sep 23, 2014 5:43 am 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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)
Image
Image
Image
Valves 42 In 35 EX
ports 35 in
outside ex 37 x 28
middle ex 37 x 34

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

A87
Image
Image
Image
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 :)


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Wed Jul 11, 2018 6:35 pm 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
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
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image
Image

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)


Top
 Profile  
Reply with quote  
 Post subject: Re: L20B rebuild
PostPosted: Wed Jul 11, 2018 8:24 pm 
Offline

Joined: Tue Mar 11, 2003 10:43 pm
Posts: 107
Location: Glasgow, Scotland
Sorry guys having some issue with displaying the new images, Hope to get it sorted shortly


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 14 posts ] 

All times are UTC + 10 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group