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A series VS J series
http://www.ozdat.com.au/forum/viewtopic.php?t=6196		 Page 1 of 1
Author:  Bozo510 [ Thu Sep 22, 2005 12:01 am ]
Post subject:  A series VS J series
Hey fellers, quick question probably aimed towards the more knowledgable guys due to the age of the components;

What are the differences between the A series datsun motor and the J series?

Are they similiar block wise (e.g. Z18 and L18) or are they completely different.

Reason im asking is because im looking at purchasing a 411 bluebird wagon that is complete minor the motor but with auto box.

Im thinking a J series would be pretty hard to locate in any condition, so a A15 would be a nice choice if it bolted in.

Im hoping someone can help me, Baz I think you know a bit about these motors?

Any help appreciated

Cheers

Martin
Author:  proL18 [ Thu Sep 22, 2005 12:03 pm ]
Post subject: 
someone else had a question about J series engines a while ago too - maybe it was on 1200.com... i thought they were the same but apparently there are some serious differences. here are some things i learned :arrow:

the J series is a metric version of the BMC A series.

there were some earlier versions, but the most common are the J13 and J15.

the J15 has a longer stroke than the A15 - and no, the rods and crank aren't compatible - the rods have a different journal size and i think i read something about the crank journals being at different centres too.

the heads have about the same flow as an early A12A head. i dunno if this is the same as any other A12 head though...

an A series is almost a straight bolt in - just use the J series mounts like you would putting a 120Y A12 into a datto 1200.

i don't think anyone has built a "performance" J series because they rev like a diesel due to their LONG stroke - but for a peak hour crawler i dare say a little weber and a nice cam and it would be a very economical daily.

that's about it from me...
Author:  greiggy [ Thu Sep 22, 2005 4:01 pm ]
Post subject: 
might not help... but ive got a j15 motor im considering getting rid of...... but im in qld.... dunno where you are....
Author:  Bozo510 [ Thu Sep 22, 2005 10:45 pm ]
Post subject: 
Im in scotland at the moment, but will be back in sydney sometime, any chance you would sell the engine mounts?

Thanks for the info Pro240c, how to bolt a A series in its place was the main bit I was looking for, and if a J series auto box will bolt up to a A series block and fly.

cheers

Martin
Author:  proL18 [ Fri Sep 23, 2005 11:33 am ]
Post subject: 
i dunno about the box - not sure if they have the same bolt pattern...
Author:  LSeries_1200 [ Sat Sep 24, 2005 11:09 pm ]
Post subject: 
the good thing is the gearbox has the same bolt pattern as the Lseries gearboxes(basically the same box structure maybe diff ratios), the box is bolted to a plate at the back of the jseries block, so if the plate can bolt unto the aseries u might have a good thing going.
Author:  Tyrie [ Sun Sep 25, 2005 8:16 pm ]
Post subject: 
Quote:
the box is bolted to a plate at the back of the jseries block, so if the plate can bolt unto the aseries u might have a good thing going.
would I be right in assuming that would mean we could put L-series 5-speeds on A-series motors... surely someone would have cottoned onto this.

there's plenty of 620's in wreckers.

-Tyrie
Author:  LSeries_1200 [ Thu Sep 29, 2005 12:14 pm ]
Post subject: 
but the the Aseries 5 speed has the same ger ratois as the Lseries n the box isnt any stronger...


but i dont know for sure if the box will fit.....it all depends on if the plate can bolt unto the aseries block.
Author:  d [ Thu Sep 29, 2005 12:58 pm ]
Post subject:  j18 too
79.5mm bore on some
and 90mm stroke on the j18
I think that one had the 80mm bore from factory.
Would make a nice supercharged engined or turbo.
the j18 is from india and mexico and about 1770cc
Author:  d [ Thu Sep 29, 2005 12:58 pm ]
Post subject:  j18 too
the only problem is the 3 inlets and twin outlet head like the old mg engines or mini ones. However there is a twin cam for them but been pommy castings they where well...as good as poms tennis players in wimbledon. however 150bhp for the twin cam isnt too shabby from factory.
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