81 replies to this topic

[WhaleOilBeefHooked]

The "NG" could only identify Non Genuine...

[yel327]

Byron ,no but you forgot NG.

cheers

 

I did say "to name a few". I also deliberately left out a few others too.

But AFAIK there was no NG as there was no QG, JG, FG, GG, CG or HG. The reason being they generally didn't use the letters corresponding to an existing first digit (ie vehicle series) ie Q, J, C, G, F or H plus O and I to avoid confusion with 0 and 1. As far as I'm aware the first G used was VG for V7X VK 304 although there may have been one in Camira etc. If it isn't a dodgy number it must be something obscure, maybe a forklift engine or cement mixer motor or something like that.

[crabba67]

NO, NG prefix one more casted in #G2 and #G3.

cheers

Attached Files

•  787.jpg   37.16K   4 downloads

[yel327]

Must be a Nasco or whichever the mob was that supplied GMH engines for a Agitator of Forklift as I said. It isn't a Holden or Torana or Bedford engine, and has to be a replacement engine or one supplied as a spare part

[FLY_AGAIN_XU-1]

Hi

Spare a thought for the owners of the 14 cars built between the lowest and highest engine numbers on the "150 list" whose engine number doesn't appear. Does anyone think that there was nothing special about the engines in their cars?

Bazza

 

Engine numbers like JP389265 & JP389335 just to name a couple. The fact that these cars had all the 1973 " Bathurst " bits, like extractors, fine spline axels and centres, cut outs in the fan blades and all the bolt on bits too...........

 

 150 list.jpg   136.68K   6 downloads

[FLY_AGAIN_XU-1]

However, these August built " Bathurst " LJ XU-1,s that were produced up to the 21st, 22nd of August 1973 had one vital homologated component missing and it was not the larger front disc brake rotors, as these had been fitted to XU-1,s from the 1st of July 1973.......

 

It was........

[jd lj]

Wait for it........

[lx308]

However, these August built " Bathurst " LJ XU-1,s that were produced up to the 21st, 22nd of August 1973 had one vital homologated component missing and it was not the larger front disc brake rotors, as these had been fitted to XU-1,s from the 1st of July 1973.......
 
It was........

It was... a 'I'm a wanker' sticker on the rear window?

[jd lj]

It was... a 'I'm a wanker' sticker on the rear window?

Is anyone making those decals as a reproduction item.

[lx308]

Is anyone making those decals as a reproduction item.

Finding it hard to get the font 100% correct as original...

[Rockoz]

Finding it hard to get the font 100% correct as original...

Pretty sure I have thousands of different fonts available on one or two of my programs.

 

Cheers

 

Rob

[FLY_AGAIN_XU-1]

Wait for it........

 

It was the revised starter motor wiring (PN : 9931278) and main wiring harness (PN : 9936405) which was only incorporated into production from the 22nd of August 1973 at the Brisbane plant and the 23rd of August 1973 at the Adelaide plant. From the 1st of August 1973, Extractors, Fine spline diffs, fans, retainers etc etc etc were incorporated into production, however the revised starter motor wiring and main wiring harness was not incorporated until the 22nd - 23rd of August. The revised starter motor wiring was fitted to the final 150 engines while the final 151 bodies received the revised main wiring harness. This was a vital homologated component because it stopped the wiring from burning on the extractors. Neither were included in Flash Bulletin No 136. The final 250 engines which began in July at JP363 were fitted with the 1973 " Bathurst " conrods, pistons, bearings etc. 250 being the minimum number required under the C.A.M.S. 1973 Group C rules.

 

 150 starter 1.jpg   784.86K   8 downloads

 

 150 starter 3.JPG   173.31K   14 downloads

 

 150 starter 4 (2).jpg   243.65K   6 downloads

 

 150 starter.JPG   312.36K   2 downloads

[FLY_AGAIN_XU-1]

 150 starter 2.JPG   290.15K   1 downloads

 

Under amendment 9/2E a new Cylinder & Case Assm.  -  P/N   9934061 was homologated. For those that do not understand, another term for " block ". These blocks and engines went into production from JP363, the final 250 engines. Here is what a Holden Engine Production Engineer who worked at the engine plant recalls :

 

Quote :

 

My recollection that these blocks had hand rubbed cores to optimise the following

 

Main bearing pedestals

Barrel core symmetry

Ensure clearance between con rods and bottom of bores and camshaft tunnel

(Note Cranks were ground at max stroke and rods were max length!!)

Max top deck thickness for max joint stiffness between block and head and still allow race teams to deck height the block

Max radius between barrel core and top deck to ensure adequate material left after notching the block for inlet valve clearance

Traditionally such blocks would have had normally a daub of identifying paint and a batch ticket on each pallet, but this was relatively unreliable and "lost" once the engine was built and painted, hence the second date code.

 

End Quote :

 

 

Under amendment 9/2E a new head was also homologated which also had a higher deck height, Holden P/N 9934042 or head unassembled 9934044. The 2 components combined (Head & Block) allowed extra strength for the fly cuts and also allowed maximum stroke. Combined with the newly homologated pistons, conrods & bearings it went a long way to produce a very quick and reliable Group C race engine.

 

 

[crabba67]

.

Attached Files

•  bathurst 250.jpg   95.17K   9 downloads

[jd lj]

Hmm, what a coincidence that these engines started in the 363... engine number range and so did the dual cast dated blocks.

[73SUNBURSTEXYOUWON]

It was the revised starter motor wiring (PN : 9931278) and main wiring harness (PN : 9936405) which was only incorporated into production from the 22nd of August 1973 at the Brisbane plant and the 23rd of August 1973 at the Adelaide plant. From the 1st of August 1973, Extractors, Fine spline diffs, fans, retainers etc etc etc were incorporated into production, however the revised starter motor wiring and main wiring harness was not incorporated until the 22nd - 23rd of August. The revised starter motor wiring was fitted to the final 150 engines while the final 151 bodies received the revised main wiring harness. This was a vital homologated component because it stopped the wiring from burning on the extractors. Neither were included in Flash Bulletin No 136. The final 250 engines which began in July at JP363 were fitted with the 1973 " Bathurst " conrods, pistons, bearings etc. 250 being the minimum number required under the C.A.M.S. 1973 Group C rules.
 
150 starter 1.jpg
 
150 starter 3.JPG
 
150 starter 4 (2).jpg
 
150 starter.JPG

Hi FLY_AGAIN_XU-1,

can you share what the colorful identifier markings are, against the engine numbers on the images of the 150 list please.

[jd lj]

Quote, The final 250 engines which began in July at JP363.

363 621 seems close to the start of these blocks. Does anyone know of a lower engine number than that?

[FLY_AGAIN_XU-1]

The blue strokes to the right of the engine number are engines I know of. The blue and red markings on the left hand side of the engine numbers tell me if they are Brisbane or Adelaide engines. I done this in the 80,s and 90,s prior to the release of the vin disc. I too once believed there were only 150 1973 " Bathurst " LJ XU-1,s produced.........

 

Thanks for the shot of the XU-1 head......

[jd lj]

Bruce,
Have you got any sample photos to show what to look for?

[FLY_AGAIN_XU-1]

I am hoping this is what you are after JD ? These are photos of JP374406 which was removed from a July built LJ XU-1 completed on the 24-07-1973. 1 of the final 250 special engines.

 

 thumbnail_P1010332.jpg   334.71K   5 downloads

 

Normal cast date

 thumbnail_P1010334.jpg   413.49K   3 downloads

 

Extra cast date (Exhaust Side)

 thumbnail_P1010329.jpg   312.88K   5 downloads

 

 thumbnail_P1010338.jpg   334.63K   7 downloads

 

These special engines were incorporated into production in July 1973, starting at JP363. From around the 1st of August further components were incorporated into production, like extractors & fine spline diffs etc. The final 150 engines incorporated the revised starter motor wiring which started production around the 22nd-23rd of August 1973.

[73SUNBURSTEXYOUWON]

This 150 list engine block, JP392533 is only single cast date code 9G3.

Attached Files

•  received_255423476113760.jpeg   166.72K   9 downloads

[jd lj]

My question was in relation to your comment about the blue markings.
Quote,

The blue strokes to the right of the engine number are engines I know of. The blue and red markings on the left hand side of the engine numbers tell me if they are Brisbane or Adelaide engines.

Engine number 363 621 cast date 27f3 is the lowest engine number that I've seen as I mentioned earlier. But IIRC some may have been 20f3.

How long until this thread disappears?

[crabba67]

With pattern number 3 on both sides only on Dual Cast blocks cast on the 20F3 the first of the cast dates.......the last 10H3

Attached Files

•  20f3 1.jpg   115.73K   6 downloads
•  JP387780 20F3.jpg   156.9K   6 downloads

[FLY_AGAIN_XU-1]

This 150 list engine block, JP392533 is only single cast date code 9G3.

 

 post-29046-0-29361100-1613347762 (2).jpeg   74.31K   9 downloads

 

Are you sure that is 9G3 ? Looks like 8J3 ?

[crabba67]

Didn't body 1635A also have the wrong vin/psn tag L201902 and the engine JP147384 which is in the dublin green 8/72 up for sale at the moment seem to be linked.