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SU Carb rebuilding
https://www.ausmini.com/forums/viewtopic.php?f=2&t=91444		 Page 1 of 2
Author:  glenndunn [ Mon Jan 04, 2016 4:37 pm ]
Post subject:  SU Carb rebuilding
Hi all
I am rebuilding my SU's, when I took them off I looked at inlet manifold stamping and seen AEG573.
This does not seem right they are off a 67 Mk1 cooper s and they don't have the tags on the float bowls unfortunately, I have read a post about NSW police vehicles used these, can anyone put some light on this for me
Author:  gtogreen1969 [ Mon Jan 04, 2016 4:44 pm ]
Post subject:  Re: SU Carb rebuilding
AEG573 is the Mk2 S manifold. AEG347 is the Mk1 S.
Those are 1 1/2" su's. Yes some police cars had them.
Author:  winabbey [ Mon Jan 04, 2016 8:15 pm ]
Post subject:  Re: SU Carb rebuilding
Remove the carbs and check how the centre bottom stud holes have been blocked off. If hex-headed grub screws then it's likely it came from the factory like that. The Police SPO41 specification included CCV instead of PCV for crankcase breathing. I see your carbs have the CCV breathing tubes blocked off.

Edit: I meant top. :oops:
Author:  miniron [ Tue Jan 05, 2016 9:00 am ]
Post subject:  Re: SU Carb rebuilding
Late model Mk1 S cars used the AEG573 manifold.
My late 68 build car had this manifold from new.

RonR
Author:  timmy201 [ Tue Jan 05, 2016 9:55 am ]
Post subject:  Re: SU Carb rebuilding
I'd say someone has put them on for a performance boost at some stage and removed the original manifold and HS2 carbs. Does one of the dashpot lids have a brass screw top?
Author:  gtogreen1969 [ Tue Jan 05, 2016 9:59 am ]
Post subject:  Re: SU Carb rebuilding
miniron wrote:
Late model Mk1 S cars used the AEG573 manifold.
My late 68 build car had this manifold from new.

RonR
How many cars? The last 10 or the last 100.
Author:  glenndunn [ Tue Jan 05, 2016 10:20 am ]
Post subject:  Re: SU Carb rebuilding
winabbey wrote:
Remove the carbs and check how the centre bottom stud holes have been blocked off. If hex-headed grub screws then it's likely it came from the factory like that. The Police SPO41 specification included CCV instead of PCV for crankcase breathing. I see your carbs have the CCV breathing tubes blocked off.



No grub screw in the bottom only in the top
Author:  winabbey [ Tue Jan 05, 2016 5:55 pm ]
Post subject:  Re: SU Carb rebuilding
glenndunn wrote:
No grub screw in the bottom only in the top

Sorry, I meant the top, as it's the one that goes all the way through to the chamber. :oops:

So yours looks like a factory modified manifold for SPO41.

Here's part of the engineering drawing detailing the modification to the standard MK II Cooper S inlet manifold (AEG573), believed to have been done by Lynx Engineering for BMC.

Attachment:
AYG0245 Rework Inlet Manifold subset.jpg
Author:  winabbey [ Tue Jan 05, 2016 6:02 pm ]
Post subject:  Re: SU Carb rebuilding
By the way, the first MK II Cooper S with the performance modifications for NSW Police known as SPO41 was YG2S4-2372, delivered in September 1970. So no Mark 1 Cooper S and none of the early MK II's for NSW Police were SPO41. They were all stock standard performance-wise. The only difference from showroom versions was lowered seats, reversing lights and racing disk brake pads.
Author:  miniron [ Wed Jan 06, 2016 7:28 am ]
Post subject:  Re: SU Carb rebuilding
gtogreen1969,

Car 4825

RonR
Author:  glenndunn [ Wed Jan 06, 2016 8:55 am ]
Post subject:  Re: SU Carb rebuilding
winabbey wrote:
By the way, the first MK II Cooper S with the performance modifications for NSW Police known as SPO41 was YG2S4-2372, delivered in September 1970. So no Mark 1 Cooper S and none of the early MK II's for NSW Police were SPO41. They were all stock standard performance-wise. The only difference from showroom versions was lowered seats, reversing lights and racing disk brake pads.



So my 67 cooper s has factory modified inlet manifold that were used on MK 11 police cars, is this right Winabby or is it factory modified for a MK 1 ?

Thanks for your help
Cheers
Glenn
Author:  timmy201 [ Wed Jan 06, 2016 8:59 am ]
Post subject:  Re: SU Carb rebuilding
It's a Mk2 manifold modified as per the police spec SPO41. They were only fitted to cars from 1970, so definitely not correct for a Mk1 1967
Author:  Aussie Brian [ Wed Jan 06, 2016 9:02 am ]
Post subject:  Re: SU Carb rebuilding
winabbey wrote:
The Police SPO41 specification included CCV instead of PCV for crankcase breathing. I see your carbs have the CCV breathing tubes blocked off.


Hi Doug,
What does CCV stand for?
Brian
Author:  gtogreen1969 [ Wed Jan 06, 2016 9:49 am ]
Post subject:  Re: SU Carb rebuilding
Aussie Brian wrote:
winabbey wrote:
The Police SPO41 specification included CCV instead of PCV for crankcase breathing. I see your carbs have the CCV breathing tubes blocked off.


Hi Doug,
What does CCV stand for?
Brian
winabbey wrote:
The SPO41 specification in 1970 may have been the first opportunity to introduce CCV (Carburettor Crankcase Ventilation) into production.

CCV is dead simple. The fumes go up the hose from the oil separator at the back of the engine and into the body of the SU carby where they are sucked into the combustion chamber and burnt. The twin carby models utilised a Y piece to separate the rubber tube so as to feed both carbys.

There was no provision on the normal Mini SU's for the breather tube so introducing CCV would've required a change of carby type. The carby specification for the Police HS4's was designed for just that application (the SU detailed specification sheet for AUD488 is called NSW Police) so HS4 carby bodies with this provision could be specified, doing away with the need for a more complex PCV system.

Later Clubman models moved to CCV along with other environmental design changes.

So perhaps it was just a timing thing with SPO41 cars providing the first opportunity to introduce CCV into the Mini range.
Author:  Morris 1100 [ Wed Jan 06, 2016 11:47 am ]
Post subject:  Re: SU Carb rebuilding
I think CCV is Closed Crankcase Ventilation.
PCV is Positive Crankcase Ventilation.
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