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SU flat top something doesn't look right


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#1 blu260z

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Posted 12 March 2015 - 07:34 PM

Ok where do I start.
I havent even attempted to tune the carbies as I don't have a radiator so cant get the car upto temp. SoI thought I would take a look tonight get my head around the su flattop :)  I had a flick through my 260z service manual to find all my idle and mixture screws. Nothing on the carbies relates to the book  ??? I realised the previous owner has removed all the emissions gear on them but other stuff doesn't add up 

Like idle speed and mixture screws
Its a 1976 2+2 260z

Thanks guys
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#2 gav240z

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Posted 12 March 2015 - 07:45 PM

They don't look like 260z Hitachi Flat top carbs. They look significantly smaller.

Yours look like they are off a 4 banger L-GATA.
http://datsun1200.co...tachi_Twin_Carb

See also here:
http://www.viczcar.c...hp?topic=7168.0

#3 blu260z

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Posted 12 March 2015 - 07:58 PM

Definitely doesnt look right  :'( the car starts and runs runs but is very slow to take off so It could possibly be causing this as the car needs more fuel

#4 gilltech

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Posted 12 March 2015 - 07:59 PM

Don't waste your time with them. Get a set of the round tops from a 70-72 240Z & go from there.

#5 blu260z

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Posted 12 March 2015 - 08:05 PM

I think that might be an option now gilltech

#6 pauly_adams

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Posted 12 March 2015 - 08:37 PM

there from a 4 cyl L series, 6 cyl ones have internal fuel bowel

#7 blu260z

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Posted 12 March 2015 - 08:43 PM

So they are better off as paper weights ?

#8 gilltech

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Posted 12 March 2015 - 08:57 PM

Any of the flat tops make suitable paper weights. Those ones look like reconditioned 200B carbs or somesuch.
Yes the flat tops on '73-on Zeds can go OK, -ish, (the correct sized ones) but the problem is that they were designed for the 70's oil crisis era & emissions & lean burn & there's not a lot one can do with them. Or get parts. So everybody bins them & fits the 240Z's round tops or British SUs, and blanks off the 260's emissions pipes & tubes. And are glad they did.

#9 Mr Camouflage

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Posted 12 March 2015 - 11:35 PM

So they are better off as paper weights ?


Sell them to someone with a 4 cyl on ebay.

#10 blu260z

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Posted 13 March 2015 - 07:42 AM

Looks like I will be selling these to a 4cyl datto owner and will be looking for a set of su 240z round tops. But honestly why would you go to all that effort of putting on a set of 4cyl flat tops when the car didnt even run in the first place, might as well have said sorry mate it has no carbies they where shot!!!


#11 gav240z

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Posted 13 March 2015 - 10:41 AM

Looks like I will be selling these to a 4cyl datto owner and will be looking for a set of su 240z round tops. But honestly why would you go to all that effort of putting on a set of 4cyl flat tops when the car didnt even run in the first place, might as well have said sorry mate it has no carbies they where shot!!!


There is no point questioning what previous owners do, they just do these things. I've stopped questioning their motives and realised they are mostly all idiots with no clue. HAHA.

#12 blu260z

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Posted 13 March 2015 - 11:02 AM

Very true gav  :)

#13 pauly_adams

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Posted 13 March 2015 - 08:29 PM

those flat tops are far better then the 260z ones, they will not be as good in performance but much better in general

#14 blu260z

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Posted 13 March 2015 - 09:17 PM

Wont they give me stuff all performance. Surely they would constantly be starving the engine of fuel ?

#15 gilltech

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Posted 13 March 2015 - 09:41 PM

Surely they would constantly be starving the engine of fuel

Depends, if they've been modified with bigger jets etc might work OK, they look pretty clean as if they've been professionally rebuilt, looks like someone has gone to some trouble, as normally carbs of that era are well oxidized by now whereas those have been polished.
Why someone would bother with those when they could just as easily sourced some SU's with all the parts back-up available, who knows.
However, the only way to know if they're up to the job is to try them.

#16 blu260z

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Posted 13 March 2015 - 10:14 PM

Looks like i might have to give them a shot. No harm in trying i guess :)




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