MIKUNNI 40PHH

[LUIS COLCHETE]

Hi!

 

Im pretending to buy Twin Mikuni 40phh for my Datsun 1200 with A12 engine...

 

What you think? I need to modifiy my fuel pump? Change Jets? Which Dimensions?

 

 

The specifications that i saw on vendor

Mj 160 Aj 210 Pj 60 outer ventury 32 what does it mean?

 

 

Many thanks on advance

 

 

Luis

[banzai510(hainz)]

main jet 160 air jet 210

air venturi woulkd be the inner venturi or inner funnel.

 

On my L motor I have 130 main jet and 160 and this is a L16 with a performance cam so on a A motor this is big.

You would need smaller jets.

 

uyour pstock fuel pump should be fine.

 

maybe just buy a weber 32/36 DGV 5a

[LUIS COLCHETE]

Hi!

 

These carbs are almost new are very nice and in good conditions... and are genuine japanese...

Exist smaller jets for this on ebay?

 

Perhaps i will buy them and modify all jests?

 

What do yo think

[LUIS COLCHETE]

I m pretending to buy a new cam too.

 

Many thanks on advance.

 

I m upgrading step by step

[Driftease]

Buy jets at redline.com I would strongly suggest you don't buy them unless you know how or are willing to learn how to tune them. They require a lot of patients to get set up correctly there are hundreds of thousands of jet/air bleed/E-tube/idle jet combos and may require a dyno and a 4 gas analyzer to get it perfect. Jetting is much easier if the carbs were in a kit for your engine in the first place so the E-tube will be properly selected then you just swap out jets till it is good.

[banzai510(hainz)]

Driftease

Redline sell only webers parts.

He has Mikunis

[ggzilla]

You CANNOT say what jets to use until you know which venturies you will be using. Venturi selection is the first step in tuning. 32 mm venturis are a bit large for an A12 so won't run perfect. For 6400 rpm I recommend 29mm venturis for excellent top-end power with good low speed response. Or for 6000 rpm use 27mm for stock A12 to get best response.

 

Or, bolt the Mikuni PHH40s on, adjust them, and see how it runs. It should run OK. Then you can begin tuning them to meet the needs of your engine.

 

For baseline jetting:

* 32mm venturi fit 128 main jets and 180 air jets

* 29mm venturi, 116 main jets, 165 air jets.

This will set the air/fuel ratio for cruising (non-accelerating mode)

 

Then comes the hard part - tuning for acceleration and low speed running. This is where each modified engine will be different: idle jets, power valves, emulsion tubes, accelerator pump adjustments, and possibly juggling the main/air jet combo (larger main + smaller air or vice-verse ).

[ggzilla]

The factory A12 fuel pump is high volume and supplies almost twice the fuel needed. It also supplies the exact fuel pressure recommended by Mikuni.

[Driftease]

Driftease

Redline sell only webers parts.

He has Mikunis

try www.wolfcreekracing.com in stead

[ggzilla]

It is possible reduce Mikuni PHH venturis from 32 to 29 mm?

 

Yes. With the PHH, venturis are tuning parts. Just like with Weber DCOE and Dellorto DHLA.

 

http://wolfcreekracing.com lists 30 mm venturis for sale, and invites asking for any parts needed.

[LUIS COLCHETE]

Hi!

 

I decide and i bought a twin Mikuni Solex 40phh for my Datsun A12 Engine. (were from a Toyota)

I have to change the jets and venturies. i need a intake for them. whre i can find one.

 

 

Many Thanks,

 

 

Luis