79 replies to this topic

[GTRXU1]

What is a 71 Bathurst Xu-1?

[71xu1]

Ill go first apart from the engine mods cam and different carby needles. The main differences are engine prefix (CK) nibless rims, all aussie box, same console as LJ, extractors, resinator, twin exit forked exhaust, adr changes these are in the muscle car by the numbers book, head restraints not sure if in all 71 bathursts and full colur choice. Ammend or add as necessary

What is a 71 Bathurst Xu-1?

[S pack]

What is a 71 Bathurst Xu-1?

Reinforced front lower control arm.
Baffled diff housing.
New CK engine prefix.
Increased lift camshaft with revised valve timing.
Inlet and exhaust valves with slightly larger head diameter.
New cylinder head with reduced valve guide heights.
New balanced section molybdenum filled cast iron barrel laped top piston ring.
Improved attachment of oil pan baffle - brazed as well as spot welded.
Oil pump pickup set closer to base of oil pan.
New Zenith metering needles 5H in lieu of 6E.
New Aussie XU1 M20 close ratio gearbox.
New clutch plate.
New road wheels with thicker wheel disc and no hubcap nibs.
Radiator core now has 14.5 fins per inch, in lieu of 12 fins per inch.
Revised centrifugal advance and vacuum advance settings, initial timing setting now 10deg BTC at 900 rpm.
Larger 2" exhaust system in lieu of 1.3/4"system. Muffler is one 2" pipe in with two straight tips out.
Head restraints fitted to front seats??????
Extractors - NO.
Revised centre floor console (carried over to LJ model) with shift pattern plate to suit Aussie M20.

[frash da bucket]

Hi,

They had cast iron headers 2 into one,

And a single 2" tail pipe with a chrome extension.

Cheers.

[FLY_AGAIN_XU-1]

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 ???

[frash da bucket]

Hi oz772,

When i was at xu-1's on the mountain,

all of the ck 9/71 i saw on that day,

no resonators were fitted on any of them,

and i know of one in sydney also and hasn't,

got one fitted also,the same as a 9/72 bathurst.

Cheers.

[meanmachine72]

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 ???

the 200 3/71 4/71 cars...............

[Bazza]

Hi

The LC parts catalogue lists "pipe and resonator assembly" for the XU-1 (186X). It has the same P/N 2823705 as for the LJ XU-1. If this wasn't for the CK LC XU-1, what was it for??

Cheers

Bazza

[FLY_AGAIN_XU-1]

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 ???

the 200 3/71 4/71 cars...............

200 (2/71) Eligibility H2-2

200 (3/71, 4/71) Homologation 1/1E

300 (9/71, 10/71, 11/71) Homologation 1/2E

[71xu1]

Tailshaft painted same colour as Lj 6cyl tailshaft red.

[FLY_AGAIN_XU-1]

Nothing in the rules requiring them to be fitted in production only that 200 basically identical units were required. According to GMH Dealer Service Letter 141 they went into production on the CK,s. Were,nt the 200 (3/71 & 4/71) 1/1E cars responsible for the resonators anyhow...........

[frash da bucket]

Hi Bazza,

Mayby the resonators were fitted lc xu1 3100's,

And on the lc xu1's ck's weren't fitted they were deleted,

And all of the 34 ck lc xu-1's were at xu1's on the mountain,

They all had single out let tail pipes with chrome extensions.

Cheers.

[yel327]

Hi

The LC parts catalogue lists "pipe and resonator assembly" for the XU-1 (186X). It has the same P/N 2823705 as for the LJ XU-1. If this wasn't for the CK LC XU-1, what was it for??

Cheers

Bazza

Be careful of reliance upon parts catalogue for facts. The catalogues were designed to allow parts dealers to sell bits to keep cars going using genuine parts. I don't know XU-1's real well, but for HK-HG for example the parts numbers changed in later editions to what was available. Example, 1972 HK manual (blue) is full of "wrong" part numbers for a genuine GTS 327. The bits are all later bits that will do the job, like the cylinder heads listed for type 1 GTS327 which are big valve double hump fuellies, yet the original cars had small valve, small port truck heads. I wouldn't be surprised if the same happended to the LC catalogue.

[S pack]

 Aug71 XU1 p1.JPG   178.22K   326 downloads
 Aug71 XU1 p2.JPG   144.04K   305 downloads
 Aug71 XU1 p3.JPG   91.54K   263 downloads
 Aug71 XU1 p4.JPG   124.48K   252 downloads
 Aug71 XU1 p5.JPG   161.01K   265 downloads
 Aug71 XU1 p6.JPG   215.18K   258 downloads

[FLY_AGAIN_XU-1]

To my knowledge the first 300 LJ XU-1,s (ie 1/72, 2/72, 3/72) ran the 949 rubber fuel lined 175 CD stromies with white choke cables.........

Certainly according to the GMH Dealer Service Letter 141 dated the 19-8-1971 both the resonator and twin chrome tipped mufflers were a production change for the CK,s with a host of other goodies............

[S pack]

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 ???

the 200 3/71 4/71 cars...............

 March LC XU1 camshaft p1.JPG   185K   325 downloads
 March LC XU1 camshaft p2.JPG   132.61K   309 downloads

GMH must have been telling porkies when they sent this off to the dealers.

Edited by S pack, 13 April 2010 - 01:24 AM.

[frash da bucket]

Hi John,

There were 34 cars there you had see it to believe it,

There were 116 torana's that 4 day event at bathurst,

And yes i do have photo's of that event.

Cheers.

[FLY_AGAIN_XU-1]

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 ???

the 200 3/71 4/71 cars...............

 March LC XU1 camshaft p1.JPG   185K   325 downloads
 March LC XU1 camshaft p2.JPG   132.61K   309 downloads

GMH must have been telling porkies when they sent this off to the dealers.

I cant see any porkies there Dave !!! We must remember that just because a part was homologated for the race teams does,nt always mean that the production variants recieved these changes. Unless specifically stated in the cams rules that these parts were required to be fitted in production Holden were only required to build 200 basically identical units. By Holden building these 200 basically identical units allowed the race teams the use of the homologated parts. The homologated 1970 Bathurst baffled diff housing is a prime example of this. Homologated for the race teams to use in the 1970 Bathurst race but did,nt make the production cars until the 1971 CK,s. So you see for Holden to homologate the new cam (XH), 5H needles, spacers, resonator etc (Homologation 1/1E) they were only required to build 200 basically identical units. These 200 basically identical units have ADR,s of 3/71 & 4/71.........

[FLY_AGAIN_XU-1]

Gearboxes, radiators and wheels (Homologation 1/2E) were required under the cams rules to be fitted in production. Camshafts, needles etc were not.......