Well actually HR 186S have 186K prefix.

Warren

I looked at this engine a while ago, and it makes sense for it to be a Nasco replacement short motor for a 186S. The reason for the S on the end would probably be to distinguish it from 186P and 186L eg the 186P replacement would be 186N1979P. This is all

Any idea how you tell if it is a 186S would it have an engine number like this 186Sxxxxxx or other?

I saw another one of these recently ie 308NxxxxS. It is a 9/72 cast block. To have on of these numbers I believe the block needs to have been built after HQ engine production started as that was when Nasco started the N numbering (at 1001).

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If we all had the same (good) taste, who would buy all the Fords?

Edited by user Tuesday, 7 October 2008 4:27:50 PM(UTC)  | Reason: Not specified

Are you sure its not 161H17812? Whats on the side of it?

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If we all had the same (good) taste, who would buy all the Fords?

Could be 161R17812.

A 161R prefix is for a 161 high compression HR.

Dr Terry

Michael

A replacement engine should have a Nasco or GMP&A number, ie NP. The number sequence started at 1001 around 5/71 and it was at around 10000 by the late 70s. Prefix changed to N5 for blue motors onwards, and then S at VN release. Im not sure if the number sequence reset at any stage. So in short, a factory replacement engine would not have been given a JP prefix or exist in the HQ engine number sequence, it would be NP and be in the Nasco sequence. So how what you have came into being is a bit of a mystery. Likely scenarios:

1971 normal 202 block restamped with a made up number;
Original XU-1 block with number replaced by a made up number;
Someone within GMH doing something way out of the norm.

My best guess would be the second one, ie someone got a 202 and destroyed it, and used its sequence number prefixed by JP on a "decked" XU-1 block or possibly a blank block as race teams were able to obtain bare blocks from CAC and they would not have had a number.

A proper LJ JP or NP block is different to a normal red 202, and they werent cast by GMH but by Commonwealth Aircraft Castings. If you take the block and show it to Dave McLean (formerly of Maitland Performance) he will be able to tell you by looking at it if its a proper XU-1 casting.

Note also that an XU-1 block and piston kit isnt in the LJ parts catalogue, only a short motor. Where it says that a complete engine from current production engine assemblies will be supplied on a firm order basis, I think that means that you can order an engine from current production, but in 1978 an XU-1 wasnt current production so if you ordered a complete 202 you would have got a QL engine (I think - Dr Terry might be able to elabortate on this). However you never know, people in GMH managed to do some wacky stuff!

One other point, Ian Tate was playing with XU-1 spec egines for VB Commodore rally cars around that time...

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If we all had the same (good) taste, who would buy all the Fords?

quote:

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Originally posted by Mike81973
My friend has an XU-1 engine that I am trying to identify, can anyone help?
The engine is stamped JP 9831XX and dated J 27 1

From what I can tell it is a 1971 cast block that was put aside as a complete replacememnt engine with no number assigned until ordered in July 1978.
By 1978 neoprene rear main blocks had been out of production for some time so I suppose they had some engine put asside to cover warranty requirements.
The engine having been ordered for a XU-1 therefore being given the JP and the parts books indicate that it would have the production date sequential numbering, accounting for such an odd number.

The latest NP engine block that I have seen is a 20 H 4 but I do not know when they finished, any I deas?
I understand that XU-1s could gain a new replacement engine in one of three ways 1. a new block and pistons, 2. a short motor ( pistons crank, cam etc. or 3. a complete engine from the production assembly line.
Blocks and short motors would have had the NP prefix blocks and as the parts books indicate a complete engine would have the sequential numbering of the particular timimg of the firm order being recieved by Holden.
Knowing that each engine had its own assembly code to dictate which car it was destined for I am not surprised that it was given the prefix JP.

Can anyone add anything?

Mike


Michael Bell

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Micheal, I have a NT 308 with cast of 2G5 code 2/7/75 if any help with your studies... I also know this to be a factory replacement for a faulty bore (slightly off centre), the car is a 10/73 built GTS4 so was out of warranty, but owner was mates with a dealer principal for a dealership in melb, who pulled a few strings.

Kevin

HOLDEN The Great Way to Move

ACCORDING TO 'WWW. MONAROPARTS.COM/ENGINES.HTML' YOUR ENGINE IS A NORMAL 186 NASCO REPLACEMENT BLOCK FOR A HK-HG MADE AFTER THE INTRODUCTION OF THE HQ SERIES

Dave told me that he went to CAC and picked the blocks himself. Talk to him and ask him. He still builds engines for historic racing.
Engines were cast outside of GMH for other purposes so I can't see why XU-1 engines couldn't have been. I'm only going by what i've been told. Remember CAC's principal shareholder was GMH, and the plant is adjacent to the GMH plant at Fishermans's bend.
You can also pick later XU-1 blocks from normal 202's from what i've been told, in the crankcase area. This is a secret I have yet to discover, but i'm told you can see the difference when they are side by side. Again you'd have to talk to Ian Tate or someone like that to get the true story.

_______________________________________________________
If we all had the same (good) taste, who would buy all the Fords?