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Location:
leumeah NSW
Registered:
November 2004
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double su help
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Thu, 05 May 2005 23:18
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hey guys i just got myself a set of double su's on a datsun manifold. i want to put these on my 4k but dont know where to get a manifold manufactured to suit. can anybody give me any ideas?
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Location:
Newcastle
Registered:
April 2003
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Re: double su help
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Fri, 06 May 2005 03:25
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Are they real SU carbs or the jap version of them?
Anyway as for a manifold if redline don't make one then some alloy plate and tube cut and shaped to suit would do.Probably doo it yourself or maybe cut and shut the datsun manifold with an original 4K manifold.Anyone who can weld alloy should be able to take care of the welding.
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Location:
brisbane
Registered:
December 2004
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Re: double su help
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Fri, 06 May 2005 03:28
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mmm twin su's a real pain in the ass to tune to get em to them to run right
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Location:
Newcastle
Registered:
April 2003
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Re: double su help
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Fri, 06 May 2005 04:14
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| berad wrote on Fri, 06 May 2005 13:28 |
mmm twin su's a real pain in the ass to tune to get em to them to run right
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The original pommy ones are a pain in the arse but the jap copy are'nt to bad and tend to stay in tune.
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Location:
Adelaide, SA
Registered:
May 2002
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Re: double su help
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Fri, 06 May 2005 08:03
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Jap copy (hitachi from memory) have better tunability due a nicer linkage setup (well on the 240z anyway).
What you should do as well is buy a kit to recondition the SUs since they are probably farken old. Re-kitted SU's are much nicer/easier to tune and stay in tune. Very simple carby but works well - just make sure the oil is OK.
My dad can tune them by ear with a bit of garden hose! 
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Toymods Vice President
Location:
Sydney
Registered:
May 2002
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Re: double su help
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Fri, 06 May 2005 09:18
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| lumpy wrote on Fri, 06 May 2005 18:03 |
My dad can tune them by ear with a bit of garden hose!
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That's balancing the carbs. IE making sure they are both flowing the same amount of air at idle. It doesn't do a whole lot to tune them though really.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: double su help
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Fri, 06 May 2005 09:30
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Like Josh said, that's just balancing. To tune them, they'll need to go on a dyno with an AF meter, see where they're running lean or rich and try different needles to get as smooth an AF curve throughout the rev range. Major pest. Best bet will be to get someone who tunes Minis (and other British shite) to have a play.
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