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How to identify twin hitachi carbs
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Quote:
smariese wrote: hi huys..

I am getting flat top twin su carbs and manifold for a series and L series. the manifold and the carbs not attached. now, how to identity which carbs for A series and which for L. the jet and needle size is different for A compare to L?

please advice.

Posted on: 6/25 6:26
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Re: How to identify twin hitachi carbs
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Hitachi sidedraft carbs (SU-style) are almost exactly the same A-series and L16/L18 versions

The material differences are:
* L-series has stronger Suction Spring
* A and L use different needle valve

And the practical difference is in the throttle linkage. A uses cable linkage, L uses rod linkage (as far as I have seen)

There are only two Suction Springs. So that's an easy change. However there are many needle valves.
* I would change the spring and just run the L valve to start with. There are many adjustments you can make. The A valve is for a stock-spec GX engine (hi-rpm, large port)
* If you have totally orginal GX or A12T engine (including the cam and exhaust system) then it would be worth sourcing the GX/A12T needle valve #M75

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Posted on: 6/25 6:39
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Re: How to identify twin hitachi carbs
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Many thanks for the reply..

Posted on: 6/25 6:42
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Re: How to identify twin hitachi carbs
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yes. the suction spring of A series carb is soft compare to L16.

Attach file:



jpg  twin su.jpg (109.56 KB)
17554_5d197ada909ae.jpg 584X438 px

Posted on: 7/1 4:16
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Re: How to identify twin hitachi carbs
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http://datsun1200.com/modules/mediawi ... p?title=Hitachi_Twin_Carb

according to the above link, the a)flat top b)without IMS c)2 bolt carbs are nissan competition carb?

Posted on: 7/1 4:33
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Re: How to identify twin hitachi carbs
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British SU dome springs

* Yellow, 8oz part number AUC1167
* Red, 4.5oz part number AUC4387
* Blue, 2.5oz part number AUC4587

Not sure which is closest to L-series Hitachi dome spring

Posted on: 7/1 4:34
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Re: How to identify twin hitachi carbs
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i got part numbers for twin su needle and nozzles from a friend.

needle: 16354-A8710 / 16354-U0810

nozzle: 16355-H2310

are these correct numbers?

Posted on: 8/18 3:35
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Re: How to identify twin hitachi carbs
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Nissan sold many needles for different engines. A87 = Needle #M76 is for L18 engine. U08 is the AMC for Datsun 610 SSS. The A12GX needle is M83 (Nissan part number 16554-H2316)

Nozzle is 16355-H2310

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jpg  hitachi_m87.jpg (190.79 KB)
174_5d592d4106e36.jpg 640X480 px

Posted on: 8/18 11:49
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