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SU spacer on twin cam

 
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 259
Location: Saskatoon, Saskatchewan

PostPosted: Sun Jul 22, 2018 1:18 pm    Post subject: SU spacer on twin cam Reply with quote

I’m toying with the idea of removing the coolant spacer thingy between the head and the SU carbs on my twin cam. Looks like the bolt pattern will match by putting the carbs straight on the inlet manifold casting of the head. My concern is that I won’t have the ‘ soft mounting ‘ with the Thackeray washers, I would appreciate any thoughts. Thanks.
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Sideways



Joined: 03 Oct 2011
Posts: 322
Location: Delta BC Canada

PostPosted: Mon Jul 23, 2018 11:22 am    Post subject: Re: SU spacer on twin cam Reply with quote

1970 cortina GT wrote:
I’m toying with the idea of removing the coolant spacer thingy between the head and the SU carbs on my twin cam. Looks like the bolt pattern will match by putting the carbs straight on the inlet manifold casting of the head. My concern is that I won’t have the ‘ soft mounting ‘ with the Thackeray washers, I would appreciate any thoughts. Thanks.


Correct, it won't have the soft mounting which it certainly needs with Webers but with SUs... I dunno?

Try it and see, I suppose.
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s2europa



Joined: 30 May 2007
Posts: 107
Location: Seattle

PostPosted: Wed Jul 25, 2018 11:01 am    Post subject: Reply with quote

That spacer acts as a balance tube between the carbs. It has to do with unequal
firing that helps balance out the pulses. It won't run correctly without it. There is a European version that looks better and has a balance tube at the top so the fuel doesn't pool.
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s2europa



Joined: 30 May 2007
Posts: 107
Location: Seattle

PostPosted: Wed Jul 25, 2018 11:09 am    Post subject: Reply with quote

Scroll down to the high balance manifold. This is a custom made one, but gives you the idea.

http://www.lotus-europa.com/forsale.html
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 259
Location: Saskatoon, Saskatchewan

PostPosted: Wed Jul 25, 2018 12:36 pm    Post subject: Reply with quote

Good information thanks. I don’t know if there is anything in the carbs I can change , just doesn’t seem to have much power when I compare it to my Weber twin cam in the MK2. Difficult to get a spec for the SU set up I guess.
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1970 cortina GT



Joined: 05 Dec 2013
Posts: 259
Location: Saskatoon, Saskatchewan

PostPosted: Tue Sep 04, 2018 8:57 pm    Post subject: Reply with quote

Just an update to anyone that is interested. I removed the section between the carbs and the head and the difference is black and white. The increase in power is quite something. I have adjusted the timing and now I have it running at about 14 BTDC. The idle is not as smooth but I can probably get some improvement by changing the needles. Somehow I also notice a difference in the revs, they are now lower than before, no idea how this works.......
I realize I don’t have the soft mounts anymore but if the carbs snap off next week it will have been worth having that extra power for a few days😉.
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