Dual Su's on a A15

[king bee66]

I never did a thread in them or anything but I posted on the first couple pages of the R1 Carbs thread in this section. The intake was made out of left over tubing from my sandrail frame. I cut small wedge shaped pieces, beveled the edges and welded everything together then ground it smooth. The original couplers were radiator hose but after a couple years they shrunk up and I replaced them with gas filler hose. It's a tight fit in my 1200 so I would imagine not much more room in a b210 or 210. There are a couple different types of these carbs too; some are meant to be mounted horizontally and some are meant to be mounted at an upward angle. They are identifiable by the angle of the float bowl. Mine are the horizontal type and I think that the angled type might fit better (like the ones in the pics at the end of post#1 in the R1 thread). You could probably have a straighter intake runner instead of the "S" shaped ones on mine.

 

Don't get me wrong -- they run great but I think the fit would be better with the angled carbs. Between the low hood and the brake master it's really tight. Hope that helps.

 

thanks, i was wondering mostly about the jetting, but i got my answer from that thread, from a "random box of jets" :P seems like a reasonable alternative

[ggzilla]

Dont use a Datsun 1200 GX twin-carb manifold -- it is too big for an A15. Instead get the A14 twin-carb manifold, the one with the 4-bolt carburetor flanges. it is just right for A14 and A15 engines. See photos at the last link.

[k swag]

^^What he said^^ They were never available on USDM cars. Not easy to find in the US and rarely inexpensive. I would imagine they run just fine. Lots of good info here:

http://datsun1200.co...ng_A_Carburetor

 

 

There's always the motorcycle carb option. I had less than $100 invested in mine and they run great.

 

what bike did you take those carbs off of?

[DRIVEN]

I was told that they were from an '03 Katana (eBay) but are supposed to be the same as earlier GSXRs. The GSXR went FI a couple years before the Katana. I'm sure the jetting is different to start with but it doesn't really matter because that gets changed anyway.

[k swag]

do you know anyone that has dual carbs or itb set up with mainfold for sale?

[Stoffregen Motorsports]

Weber DGV's actually offer more volume than dual SUs/Hitachis. If you think about it on the sense that you have 4 ports breating through a common plenum as opposed to 4 ports breathing through 2 separate plenums it makes more sense.

 

The only downside to A series intake manifolds is that they don't have enough plenum. I actually machined half the plenum out of my A12 manifold. Then using one of those 240Z DGV conversion manifolds, I machined it to accept the A12 maniflod and welded them together thereby doubling my plenum area. It runs so efficiently that it actually pulls the secondary open almost by itself in the higher RPM range.

[rbastedo]

I've got an A15 with an A14 head and the GX intake and on it I've got a pair of British HIF4 SU's.

This is all in my MG Midget.

 

BillM has a lot of good Datsun stuff, and is a real knowledgeable guy who is a pleasure to deal with BTW.

[datsunfreak]

I've got an A15 with an A14 head and the GX intake and on it I've got a pair of British HIF4 SU's.

This is all in my MG Midget.

 

Did it take any mods to make them fit the A14 intake?

 

What kind of car do I need to crib the carbs from? This has potential... :cool:

[Stoffregen Motorsports]

I've got an A15 with an A14 head and the GX intake and on it I've got a pair of British HIF4 SU's.

This is all in my MG Midget.

 

BillM has a lot of good Datsun stuff, and is a real knowledgeable guy who is a pleasure to deal with BTW.

 

Nice. I like the whole "using Jap parts in Brit cars" concept. Kind of funny since Datsun started by making Austins under license from the Brits.

[ggzilla]

The first Datsun was the Type 10 of 1932.

The first Austin made by Nissan was 1953.

 

Here is the factory Datsun twin-carb A14 manifold. It is the only one with A14 port size on the engine side, and with 4-bolts for each carburetor, so 4-bolt british SUs fit perfectly.

 

[k swag]

does anyone have a set for the a14 head ? the manifold and the carbs ??bc i am building a high rpm high compression motor thats going to rev at like 8500 and i need a set up with intake and carb that can handle that kind of use let me know what you have and prices pleasee! thanks