60Patrol

Hi Everyone,

I am at the stage where I need to get my carburetor rebuilt for my patrol.
I am just trying to figure out how I should proceed. I have 2 carburetors at the moment both needing rebuilding.
The first is the original Hitachi VHA model.

The second is a Stromberg but I don't know what model it is or how to find out.

I was just wondering what people thought about the two? Which would be better to go with? I want one that will drive smoothly and with better performance.

Thanks

Other Australian members have stated that the Stromberg is a better carburetor. If you can post up a picture of it someone can identify it for you. I have one Patrol with a Stromberg on it and it runs well.

Hi Ben,

I have the WW Stromberg ( ex Holden ? ) carburettor on one of my G60s - it works a treat. Not sure that it makes any more power than the Hitachi but the twin throats should make it a smoother proposition at part throttle. I can't speak for its off-road performance though - i.e. how much angle you can crank into the truck before the main jets start gulping air in the fuel bowl - yet to be tested for me.

cheers,
D

Here's the stromberg i have. After searching the internet i think its a BX Stromberg.
If anyone can confirm that'd be awesome

ben23f, I found this page, hope it helps you ID your carb :

http://www.scribd.com/doc/68315221/4/St ... el-Numbers

Yours looks like a single throat carb, not sure if it's an upgrade or downgrade for the Hitachi, sorry.

The WW Stromberg, fwiw :



good luck !
D

ben23f,

thanks for your post - got me looking at the specs for Strombergs, which I had been meaning to do for a while...

Page 6 of that linked document should help you get an ID on your Bendix Stromberg - but I had a look at the cfm ratings on p79 and I reckon the BX might be a bit underdone on a 4 litre P motor :

Stromberg BX - 1x 29mm venturi - 210cfm
Stromberg BXU - 1x 28mm venturi - 201cfm
Stromberg WW - 2x 22mm venturi - 280cfm
Holley 350 2bbl - 2x 30mm venturi - 350cfm
Hitachi VHA - 1x 36mm venturi - ??? cfm

cheers,
D

Johnny, great info.

Without knowing exactly how the cfm (cubic feet per minute) number works on a carb, the followin is my calculation of cfm that the engine will displace in a minute of operation at the max 3800 rpm.

4000 cc = 0.141 cubic ft or cf

0.141 x 3800 = 536 cfm

Would need to look further into this number.

Hi Esteban, ben23f,

to my understanding, we would need to halve your 536cfm calculation to account for the 720 degree cycle of the four stroke I.C.E - 278cfm ( edit: D'OH, make that 268cfm ) - then multiply by the volumetric efficiency of the P motor ( somewhat less than 100 % ), and then build in some headroom on the carb's cfm rating depending on the individual's balance between economy, smoothness and power ( this is the intangible part of carb specification where specific experience would no doubt help ).

In short, it seems to me that 210cfm won't be enough to satisfy a P motor at full noise. The 4.2 litre Holden 253 V8 used the 280cfm WW Stromberg and is similarly lazy in character from the factory, so it sounds like 250-350cfm would be around the sweet spot, depending on any mods like extractors, electronic ignition, compression hike, etc.

cheers,
D

Excellent comments and information, Johnny. The clarification was needed. Your numbers make so much sense.

Guess I'll have to return my 4 barrel pronto! Ha ha ha

Esteban wrote:Guess I'll have to return my 4 barrel pronto! Ha ha ha

Just the thing for mud bashing !

horses for courses - if you build a hot 2 litre Datsun L-series motor the displacement rate is about the same as the P motor ( half the capacity, twice the rpm ), but the accumulated wisdom suggests twin big bore DCOE Webers or similar, with a combined flow rating of around 900cfm so a 4bbl might be fun, but you'll need to stop for fuel when going to the shops. And again on the way back !

cheers,
D