Triple Mikuni'

[gerrardq]

Any opinions on triple Mikuni' set ups?

Does anyone run them, where can I get some?

[scott]

I love mine. Never used any other triples before so my first time.

Be aware there are 5 variations of them from memory. Each type holds a different $ value and in general they're getting more expensive to buy.

I bought my set from Japan and a few of my friends went this path as well. 

A friend has these for sale atm, they are however Sold pending payment. He got $4k without the titanium stacks which what he was asking for them

[gav240z]

Depends if you want 40mm or 44mm. I find 40's all the time, and often at cheap prices especially if they were off a Toyota, but 44's are difficult to find at relatively modest prices. The set above were mint, so not surprised they cost $4k.

 

Back about 10 years ago I bought a set of 44's from the US by the time they arrived in Australia they cost me just shy of $1,000 AUD.

 

Prices have gone up along with the values of these cars.

 

If you are not concerned with "period correct" parts there are other options like fuel injected throttle bodies etc.. or you could look at Webers, OERs (which take weber jets) etc.. but I just happen to like having Mikuni/Solex carbs on my S30Z's. 

 

I've started to document the different types here:

http://www.viczcar.com/forum/topic/15654-mikuni-carburettor-id-thread-phh/

[luvemfast]

I have a set of 44PHH and they are delicious.   

Had 40's in the past and there is no comparison as to how much better 44's are!

Have another car with triple 45 Webers, but haven't spent enough time on it to make a comparison just yet.

 

A well set up set of Mikuni's shouldn't need constant re-tuning and can run as easily and smooth as injection.

Not to mention the sound! 

[WA240Z]

I haven't had the level of experience with mikunis as many others on here have, but speaking about my own setup I could not be happier with the triple Mikunis. The progression from idle through cruise to WOT is wonderful. Not sure what your engine size is and spec, but for a L24 I would recommend 44's work beautifully, though I have not run 40's to compare against. I can compare against original twin 240Z Hitachi's though that were in excellent tune. (Keep in mind an engine, and drive line for that matter, is a holistic thing. What works on my set up may differ to your setup. Engine specs, combustion chamber, compression, cam, ignition, exhaust etc. all play a big part)

 

The 44 mikunis offer better starting, due to the accelerator pumps, better throttle response, greater mid range torque, and substantial top end improvement (over 5,500rpm). The idle does not move from the 900rpm I have it set at, doesn't matter if I have been pottering around in a bit of traffic with traffic lights or really getting up it.

 

Mine were refurbished before I installed them onto the engine, and then I completely over hauled my throttle linkage setup, new bushes, new ball and sockets etc, I even turned up a new shaft that runs parallel to the fire wall. My throttle shaft that runs through the manifold stand offs also has fixed arms, so there is no chance of adjustment getting out. The carbs have been installed on the engine for about 18 months now, and after initial setup, and then dyno tune I have not needed to touch them. 

 

One more item to be mindful of is the type of inlet manifold you purchase needs to work with the exhaust. Not all inlet manifolds will suit all types of exhaust extractors. I needed to file the cross bracing of the inlet manifold to allow for the exhaust headers to not fowl. This is best done outside the engine bay so you can really make sure you you have no issues. I set mine up on a spare head on the work bench.

 

I sourced mine through Dave at Wolf Creek Racing in the US. I found Dave to be very helpful and professional.

 

Cheers, Billy.

[RobDC]

Hey guys, 

Anyone have any stats from the dyno?

I'm interested to see how much power people are making from their L24 with triple carb set ups, 40's through to 50's.

I know there are many more variables but would be cool to see some figures.

 

Thanks, Rob. 

[luvemfast]

An L24 won't run 50's. (Not to mention that a set of 50's will  set you back $10k+)

 

I would imagine that 40's would be ok on an L24,

But 44's are hard to beat IMHO

 

Mine were tuned on a dyno, No graph, as not chasing numbers, its all about the feeeeeelllzzzz

[600Z]

Hi guys, does any one know if there would be any gain to have 48's over 45's on a L28 as it does really come down to choke size as to how they flow from what I read. Any thoughts?

[luvemfast]

I'm no Weber expert, but wouldn't think you'd see any gains on an L28.

Choke size will make a difference dependant on what driving you want to do.

Smaller will be driveable with good low-mid torque.

Lager will be more about WOT and peak throttle.

 

Cam selection will make just as much or a difference here too.

My 2 cents

[600Z]

Hi luvemfast, that's pretty much what I thinking too and as much as you would like too but you don't drive a street car flat out all the time.

[luvemfast]

I have 44PHH Mikuni's with a 40 choke.

It's supposed to be a track car, but doesn't get driven in anger often. (let alone driven at all)

Engine is not standard, so may not be a good reference. Results may vary. lol

 

But.

I find the transition in each circuit of the carbs to be quite smooth. Cold starts are a non issue and it then turns into an animal when I step on the loud pedal!!

[Merlin240z]

I have Dellorto DHLAs 40mm on an l28 240z  I went from an L24 and did not need to change the jets.  I got them tune by a Hemi specialist in NZ.  They run perfectly with no cold starting issues or other problems.  The later DHLAs were a lot harder to tune.   40s seem great on a quick road car but 44-48s are for racing.  One of the top zed racers I know went from a 50mm weber to a 44 solex on his race car L30 engine and picked up 70 more ponies at the wheels so don't be sucked in by bigger is better.

Fuel economy seems to be quite good too but maybe it is because the jets did not get changed.  Very noticeable more  torque over the L24 as well but that also could be to do with cam, head work, CR etc

Hitachi SUs can be surprisingly good for a quick road set up if tuned right.

 

[Riceburner]

70hp, At the wheels from switching to 44's? 

[scott]

Hey guys, 

Anyone have any stats from the dyno?

I'm interested to see how much power people are making from their L24(E30 head) with triple carb set ups, 40's through to 50's.

I know there are many more variables but would be cool to see some figures.

 

Thanks, Rob. 

made 130hp roughly. stock l24 with 44's.

Probably done around 5k on them and recently a trip to sydney and back without any problems.

[Agno]

My car went from 78rwkw with Hitachi's (probably needed a rebuild) to 94rwkw with triple dellorto 40s. It has a lot more torque down low with the dellortos compared to stock but really runs out of puff over 5k RPM. I'd recommend 44s if you can justify the expense, I wish I did!