Im looking at buying a 1 3/4" SU for my mini and am wondering if it is necessary to by a different manifold, as im am currently running a 1 1/2" SU and manifold. Also, is it worth the conversion? Im just trying to get a bit more out of my 1275 motor and ths seems like a cheapish way of going about it. I was told that a 1 3/4" SU had the equivelant performance of a set of twin 1 1/4" Su's.

You will need a different manifold, but it IS worth it. Give Graham Russell a call (02) 9630 2195. He makes the manifolds and can advise you on setting it up.

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Bob Slattery
Duffman Says A Lot of Things - OH YEAH!!

You can get the 1 and 1/2 manifold opened up and match ported to the head, but it might be more cost effective to buy a new larger one.

GR does a very efficient long one for the big SU but I don't think it allows an aircleaner to be fitted unless you modify the firewall (ala Weber box). I don't think you'd want to run around for long without an aircleaner.

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Slide
1965 Mini Van (1360)
1970 Mk2 Cooper S (1310)
1978 Rover SD1 V8 (4.6)
1996 Land Rover Discovery V8 (4.0)

We modded a orginal 1 1/2 manifold to take a 1 3/4 and it works a treat better power and tourque. All we mainly done was open up the mouth were the carb sits then cleaned the throats and all a ok.

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I've Got One
You've Got One
We've All Got One
What Is It



A Bloody Mini

1970 Mini K, 1380cc, 1.75 HIF SU, 30 70 Cam, 2" Zorts
1969 Mini K, Stock Standard and Orginal. (Slow as Hell)

you wouldnt happen tha clubbie ute aka edstoy would you?

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Eddy

As they have said above, speak to GR. He will most likely want to check out you current manifold to see if it may be cheaper for you for him to modify that, otherwise I'm sure he will sell you one of his specials.

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One should never skimp on the zip ties.

Thanks for all the info. Will give Grahm Russell a call in next few days.

Yeah,
Thats me with the mini ute. Its a 75 clubman van to ute conversion Its called EDS70Y because my brother used to own it and his name is ed. Ive been meaning to get it changed to OLS70Y. Have you seen me driving around before?

Ollie

what sorta dollars are we tallking about with this 1 3/4 inch gr manifold...

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Around $200 from memory (might have been $220 once Peter Costello took his 10%!!)

WELL worth it IMO.

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Bob Slattery
Duffman Says A Lot of Things - OH YEAH!!

I worked some magic on my std 1.5" manifold, came up like a ripper, actuall size is slightly greater than 1"3/4 .



The only other thing ive had to do is open up the spacer to 1"3/4 so that it clears the butterfly
I'll be match porting it to my 12G202 head along with the extractors too

Just kitted my carb and added some bling, cant wait till it starts up





If anyones keen for a kitted 1"3/4 car drop me a PM, i may have a few here!

-Cam

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IS NOW BACK ONLINE AFTER SOMETIME..... SORRY TO ALL, FOR NOT REPLYING TO PM'S!!