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Dan69s
 Post subject: Su jetting
PostPosted: Fri Sep 04, 2020 8:31 pm 
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848cc
848cc

Joined: Sat Jul 25, 2015 7:36 pm
Posts: 22
Hi all,
I have a mk1 Cooper s motor. It has been bored to 1330 with Russell Engineering pistons, and standard Cooper s crank, has a RE266 cam. The head is ported and polished aNd I’m running twin 1/12 inch su’s.
My question is, what is the set up you would use to tune the su’s, and which plugs you would use.
Thanks in advance.
Daniel
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simon k
 Post subject: Re: Su jetting
PostPosted: Fri Sep 04, 2020 8:36 pm 
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Yay For Hay!
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Joined: Wed Sep 08, 2004 9:27 pm
Posts: 15912
Location: Wodonga - Vic/NSW border
#6 needles were good when I had a similar spec

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did I tell you that I won a trophy?
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Dan69s
 Post subject: Re: Su jetting
PostPosted: Sun Sep 06, 2020 4:21 pm 
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848cc
848cc

Joined: Sat Jul 25, 2015 7:36 pm
Posts: 22
Thanks
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Ian_B
 Post subject: Re: Su jetting
PostPosted: Sun Sep 06, 2020 5:07 pm 
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998cc
998cc

Joined: Wed Jul 02, 2014 11:38 am
Posts: 508
Number 7 same at idle and off idle but it is a but a bit richer every where else .Even CP4 didnt work for me
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Dan69s
 Post subject: Re: Su jetting
PostPosted: Mon Sep 07, 2020 4:22 pm 
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848cc
848cc

Joined: Sat Jul 25, 2015 7:36 pm
Posts: 22
the trouble im having is it idles fine, but really rich at higher revs.
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timmy201
 Post subject: Re: Su jetting
PostPosted: Mon Sep 07, 2020 5:26 pm 
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1275cc
1275cc
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Joined: Sun Apr 29, 2012 1:19 pm
Posts: 4496
Location: Wollongong, NSW
So what needle and spring do you have now?

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drmini in aust
 Post subject: Re: Su jetting
PostPosted: Thu Sep 10, 2020 7:12 am 
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religious status
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Joined: Fri Mar 19, 2004 6:19 pm
Posts: 39752
Location: near Baulkham Hills, NSW
I ran #6 needles in the 1293 with Ramflo filters.
A/F meter on the dyno drew a straight line.
It ran a Wade cam and 1.44 Corolla rockers.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:
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diecast
 Post subject: Re: Su jetting
PostPosted: Thu Sep 10, 2020 5:44 pm 
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848cc
848cc

Joined: Tue Jul 19, 2005 10:29 pm
Posts: 165
NGKBP6ES plugs for casual road driving, BP7ES plugs for being driven hard
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