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What is a 71 Bathurst XU-1?

Started by GTRXU1 , Apr 11 2010 04:02 PM

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79 replies to this topic

#51 _Mike73_

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Posted 26 December 2010 - 09:04 PM

the gtr should not have them, so why would you put them on your mustard gtr???
and getting back to a reply you made to danes post about the [red wall tyres], If you want to start to customise your very popular and in demand collector car, sell it to someobne who cares about originality and buy yourself a WRX rice grinder or something, these cars are special for what they are, not what can be modified!

hahaha
you deserved that

cheers gong

Hi Gong, perhaps I did, but this car is fairly original though some things have had been changed a bit before I bought it and I am doing my best with my limited resources to change things back to standard.

If I was doing a complete rebuild ( which I am not and have no intention of doing ) I would set it up with original bits.

It had extractors on it when I bought it and tripple SU carbies, I have got rid of the SU's and replaced the wiring harness that was destroyed by the extractors.

I will be putting the original manfold back on when I do some more work on it.

The front springs are Bathurst 73 track car specs with thicker coils and progressive rate, these will also be repaced when I get a chance as they are rather strong for some tyre types.

As a Co- incidence this GTR was built in the first week of 1973 that the Bathurst 73 Spec XU-1's were made.
I have not seen another August 73 GTR yet, I would be interested if anyone else has?

The other thing that bends these lower control arms is lowered springs so that there is little suspension travel to the bump stops.

These springs have not bent these lower control arms so perhaps they are stronger than the later XU-1 plates if they bend.

Mike

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#52 _BATHURST-32D_

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Posted 27 December 2010 - 06:20 AM

Posted Yesterday, 10:04 PM

View PostBATHURST-32D, on 25 December 2010 - 06:31 AM, said:
the gtr should not have them, so why would you put them on your mustard gtr???
and getting back to a reply you made to danes post about the [red wall tyres], If you want to start to customise your very popular and in demand collector car, sell it to someobne who cares about originality and buy yourself a WRX rice grinder or something, these cars are special for what they are, not what can be modified!

hahaha :ph34r:

you deserved that

cheers gong

Hi Gong, perhaps I did, but this car is fairly original though some things have had been changed a bit before I bought it and I am doing my best with my limited resources to change things back to standard.

mike,, i think you will fine there are alot of people trying to do that, and mabe you can now know how dane felt when you made your re-mark to him.
cheers gong

Edited by BATHURST-32D, 27 December 2010 - 06:26 AM.

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#53 _Ozzie Picker_

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Posted 31 December 2010 - 05:12 PM

thanks for sharing this thread john,

mike you just don,t get it , smoke screens and mirrors,

and those springs don,t look like 73 bathurst,there,s no room for compression there,as mentioned before,you,ll always bend stuff with them.

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#54 _sunburst73-xu1_

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Posted 03 January 2011 - 07:19 PM

+1

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#55 _Mike73_

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Posted 19 June 2011 - 08:57 PM

thanks for sharing this thread john,

mike you just don,t get it , smoke screens and mirrors,

and those springs don,t look like 73 bathurst,there,s no room for compression there,as mentioned before,you,ll always bend stuff with them.

Those lower control arms have been used for over 100,000 miles that I personally travelled in my LJ Torana in the 1980's so as you can see they are not bent.

It is you that cannot see or understand, progressive springs do vary in the distance between the coils and do touch at the bottom, but have clearance the rest of the way to the top, there are plenty of progressive springs around, most people will understand what progressive rate springs mean.

I repeat those springs have not bent those lower control arms,the only thing that bent was the rims and that was partly because I sometimes travelled at considerable speeds on gravel roads, I did not have the luxury of nibless rims which I now know would have fixed that problem.

I have had these springs out on a couple of times and have measured their free hieght and their coil diameter which matches the Bathurst 73 track car springs as specified in the Homologation document, I thought this match was a good indicator that they were as I stated, or have you some other information that the rest of us don't?

Mike

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#56 _flyxu1_

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Posted 06 March 2012 - 05:41 PM

Hi there
John
There Is a ck around in country vic Kasmir white with houthstooth interior black and white in need of full resto but complete
Flyxu1
Grantley

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#57 _Mike73_

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Posted 12 May 2012 - 01:47 PM

71,72,and 73 this will cover, has i have said before in a post the ck lc xu1 was the first of the xu1s to have this modification, but only the real race cars will have these

i never took a pic of the nut and it has a hole drilled in it and a peice of wire goes in the hole, just to stop them fulling off on the track i would say...

cheers gong

Hello Gong,
those radius rods look to me like steering rack ends ( maybe from a Austin 1800 ) welded onto the original LJ rods, the welds where they were grafted on can be seen in the picture ( the chomium or nickel line )

This type of modification may have been used in a race car to overcome flexing of the lower control arms to stablises steering at high speeds.

What does everyone else think?

Mike

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#58 _Mike73_

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Posted 12 May 2012 - 01:56 PM

I am still waiting for an answer to my question if the July - Aug 71 on model change had a smooth case gearbox or a ribbed case, I have a smooth case three speed one here, so to me it looks like a smooth case 4 speed All Aussie box would have been the first ones?

I have another Question too;

Has anyone seen a Broadcast / Build sheet for a Aug 71 model XU-1, and does it make a reference to the carbies like the references to all Aug 72 through September 73 XU-1's?

Mike

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#59 S pack

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Posted 19 October 2013 - 07:20 PM

I can tell ya,s this (According to the vin disc) Holden produced 700 LC XU-1,s in 1971 :

200 (2/71)

200 (3/71, 4/71)

300 (9/71, 10/71, 11/71)

Can you tell me which batch of cars were responsible for the homologation of the XH cam and 5H needles ???

Digging up an old thread I know but ........................

In excess of 200 LC XU1's were fitted with the new XH camshaft (Pt No.2822075) by Holden Dealers, these could have been any XU1 built up until early May 1971 not just the 200 cars produced in March and April.

The CK XU1's were the first to be factory fitted with the XH cam during engine production.

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#60 _Lazarus_

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Posted 19 October 2013 - 08:23 PM

Those gearbox ratios are M21 aren't they ?

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#61 S pack

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Posted 19 October 2013 - 09:13 PM

Those gearbox ratios are M21 aren't they ?

Not quite Mark.

1st, 2nd and 4th ratios are the same, however the M21 3rd gear ratio is 1.38:1 whereas the XU1 M20 3rd gear ratio is 1.25:1.

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#62 frash da bucket

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Posted 19 October 2013 - 11:42 PM

The same camshafts fitted in lj's.

And the gear boxes ratio for 3rd gear on a m20 is 1.51:1 not 1.25:1,that's the 3re gear for the 71-72 boxes.

cheers John.

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#63 S pack

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Posted 20 October 2013 - 12:50 AM

The same camshafts fitted in lj's.

And the gear boxes ratio for 3rd gear on a m20 is 1.51:1 not 1.25:1,that's the 3re gear for the 71-72 boxes.

cheers John.

Yeah John

1.51:1 is the ratio for third gear in the 6cyl and V8 Aussie M20 1971 onwards.

1.25:1 is the ratio for third gear in the XU1 Aussie M20 1971 - 1973.

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#64 frash da bucket

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Posted 20 October 2013 - 07:02 AM

No Dave,

The M21 1.25:1,And not M20
And 1.38:1 M21 ratio for the august September box.
I have a proper gear box bible here for aussie 4 speeds.
The M22,the one tonner box,different ratio's again,
1st 2nd 3rd are much lower again in the ratios,
and 4th still 1:1.

Cheers John.

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#65 S pack

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Posted 20 October 2013 - 07:40 AM

No Dave,

The M21 1.25:1,And not M20
And 1.38:1 M21 ratio for the august September box.
I have a proper gear box bible here for aussie 4 speeds.
The M22,the one tonner box,different ratio's again,
1st 2nd 3rd are much lower again in the ratios,
and 4th still 1:1.

Cheers John.

John

V8 M21 had 1.38:1 third gear ratio.

The XU1 Aussie 4 spd was not called an M21. Yel327 found documentation that proved the XU1 box was known as an M20.

M20 is GMH code for the 'standard' 4 spd gearbox for the model. That's why 1973 GTR and XU1 body tags didn't have the G/box code stamped on them.

M20 is the standard gearbox for an 82911 model. XU1 was an option on the 82911, therefore, if the XU1 4spd box was an M21 then the '73 XU1 body tags would have had M21 stamped on them.

"And 1.38:1 M21 ratio for the august September box. "

Agree, optional in Aug/Sept 73, but I doubt any M21 V8 1.38:1 third gear ratio boxes were ever fitted to a production car. Just an optional ratio for the racing cars.

Cheers

Dave.

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#66 frash da bucket

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Posted 20 October 2013 - 09:27 AM

Hi Dave,

The gear box book I purchased was from GMH at pagewood,when it closed down,they put a add in the local paper at the time,of things they were selling,so I went along to it.
It's a one of a kind gear box ratio book,have never ever seen another since.
It covers all ratios from september 71 to 74.

I have the 1.38:1 ratio in my box.
The 1.38:1 was a aug-sep 72 box not a 73 as you suggested.
I have seen only 1 M21 stamped on a 9-73 tagged car it was 30 years ago,and have never seen another one since.

Cheers John.

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#67 S pack

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Posted 20 October 2013 - 10:16 AM

John

Cams Amendment 6/6V

Alternative third gear ratio 1.38:1

15/06/1973.

Not saying your box isn't all original, however it was a relatively easy job for gearbox repairers to install a 497 V8 cluster and 492 third gear to replace a blown 899 XU1 cluster.

Cheers

Dave.

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#68 _1973bathxu1_

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Posted 20 October 2013 - 01:30 PM

john hi

can u tell me the ratios from your m21 mainly 2nd as i to have a m21 new with the 1.38 i bought it when i bought all the bob jane spares all light weight doors guards etc etc, some 30 odd years ago from his factory in brunswick, and ive kept it all these years

but i will agree with dave regarding the 1.25 with 899 was for the xu1s as std option

regards aldo

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#69 S pack

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Posted 21 October 2013 - 12:08 AM

The same camshafts fitted in lj's.

cheers John.

Yep, XH camshaft (Pt No.2822075) is the same as the XH camshaft fitted to the LJ XU1, except the XH camshaft used in the LJ had one important modification.

Cheers

Dave.

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#70 nstood

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Posted 21 October 2013 - 07:39 AM

back in the day my Torrie had a box where all gear changes had exactly the same rev drop - no big drop into third. no idea of ratios but awesome to drive. which one may this have been?

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#71 robj

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Posted 21 October 2013 - 09:25 AM

John,

Could you share some scans/pics from this gearbox book you have?

/Rob

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#72 frash da bucket

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Posted 21 October 2013 - 10:38 AM

Hi Aldo,

2nd gear ratio is 1.83:1 in my gear box.

Did you know there was 2 optional gear boxes in mid 72,one for street and one for the track.I bet you cams doesn't say that dave.Do you go back and read other people's posts over the years,and then put them back on here again.

Hi RobJ i haven't got a scanner at the moment or a camera.

Regards John.

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#73 S pack

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Posted 21 October 2013 - 01:32 PM

Did you know there was 2 optional gear boxes in mid 72,one for street and one for the track.I bet you cams doesn't say that dave.Do you go back and read other people's posts over the years,and then put them back on here again.

Regards John.

Hi John,

No, I didn't know the 1.38:1 third ratio was optional in 72.

Learn something new every day.

Cheers

Dave.

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#74 yel327

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Posted 24 October 2013 - 07:47 AM

Hi Dave,

The gear box book I purchased was from GMH at pagewood,when it closed down,they put a add in the local paper at the time,of things they were selling,so I went along to it.
It's a one of a kind gear box ratio book,have never ever seen another since.
It covers all ratios from september 71 to 74.

I have the 1.38:1 ratio in my box.
The 1.38:1 was a aug-sep 72 box not a 73 as you suggested.
I have seen only 1 M21 stamped on a 9-73 tagged car it was 30 years ago,and have never seen another one since.

Cheers John.

Would be a rare one, an assembly plant fitted 6cyl M21. I've only ever seen it once too, and that was on Brock's VB rally car.

The aussie 4spd designation for the wide and close ratio 6cyl boxes has always been a head-scratcher. The LJ order procedure refers to the XU1 box as essentially a close ratio M20, as does the HQ order procedure refer to the 6cyl 4spd as a wide ratio M20 (box most know as an M22). Yet by the time Sandman production started in January 1974 the 6cyl 4spd commercials get stamped M22 on the Body plate. So one does wonder if an LJ XU1 body had ever been built in 1974 if the gearbox option code would actually have been stamped?

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#75 _19ty82_

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Posted 24 September 2016 - 12:16 PM

the ck bathurst does have the resonator, and the twin tailpipe, headrests where an option from 10th month 71, you can also add extra wheel spacers to your list, the tripple choke cables changed to black, same as lj.

bathurst colours
plumdinger
rally red
yellow dolly
lunamint
baroda silver
lonoranger
glacier white
kashmir white
amethyst

but with kashmir white i have not seen this in a 71 bathurst color but it is one of only nine lc xu1 colors.

cheers gong

my ck is Salamanca red, would this have been a special order or did you forget to list this colour?

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