Early Mikuni Solex PHH44

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toadman
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Early Mikuni Solex PHH44

Post by toadman »

Early Mikuni Solex PHH44 carbs and manifold. I removed these about a month ago due to fuel leaking underneath the forward carb (see photo). They were running pretty well, nice idle, good acceleration and decent road manners, considering the setup. I did have issues with cold starting, with gas getting to the carbs, but I don’t think carbs were to blame. I always used stock mech fuel pump and may have had air leak that allowed gas to drain back, but this could have been related to leak on accel pump mentioned earlier. Other issue is the pilot screw that was circled. The threads are starting to strip, so mechanic that worked on them used some Teflon tape to properly secure the screw. I drove the car like this many times and never touched it. I’m getting to old to listen to the air they suck and looking for more quieter driving experience the SUs will provide. Also included is the 35mm air horns, the practically new ITG air filter with backing plate, Nissan heat shield, Mikuni/Solex manual, parts from work Wolf Creek did when they went over these about 10 years ago, tap and die the match threads of pilot screw.The jet sizes are noted on red tag. I’m asking $2,000.00 (OBO)for everything which includes shipping anywhere in lower 48. Feel free to pm on any questions, I’ll do my best to answer and discuss payment options.
Last edited by toadman on Sat May 21, 2022 8:19 am, edited 2 times in total.
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Re: Early Mikuni Solex PHH44

Post by DAC21 »

Not seeing photos,

Thanks
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toadman
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Re: Early Mikuni Solex PHH44

Post by toadman »

[attachment=11]39E9256A-530C-49A2-A163-95AD6B42B7E3.jpeg[/attachment][attachment=10]8FEF9903-D9B3-4418-A798-795ECC6D3E21.jpeg[/attachment][attachment=9]C6E028F0-DCCB-4C0A-8174-D1FE8D2DECFB.jpeg[/attachment][attachment=8]22F460C9-31D6-4AB8-B417-6984DD866F35.jpeg[/attachment][attachment=7]D5D638EA-24E4-4ACF-9BAD-A85FA761D7CE.jpeg[/attachment][attachment=6]F17759F5-D73D-4F69-96E1-C6D3A0380BAA.jpeg[/attachment][attachment=5]3AF8BC9B-27A9-43EB-9990-B8CE958ED5CE.jpeg[/attachment][attachment=4]9A25FD5B-5342-4B6B-B497-11C93D8112D0.jpeg[/attachment][attachment=3]88A2EBEC-9D6F-48D6-9234-7E1983AFE29B.jpeg[/attachment][attachment=2]BC50B217-69AC-4156-B674-E02B52CDF348.jpeg[/attachment][attachment=1]C4FD2492-7546-4C09-927C-F7662ACEDCD9.jpeg[/attachment][attachment=0]650B1446-C9DA-4D50-8BCD-C0A0E3CD74F3.jpeg[/attachment]
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Re: Early Mikuni Solex PHH44

Post by rwmann »

Type Q ?
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Re: Early Mikuni Solex PHH44

Post by david premo »

Type 2 not Q
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Re: Early Mikuni Solex PHH44

Post by rwmann »

Thanks. Difference being?
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Re: Early Mikuni Solex PHH44

Post by david premo »

No one knows for sure, but type 1 was likely the 36PHH, type2 is the version that you have and they cam in both 40PHH and 44PHH. You can identify them via the two screws holding the jet access cover on. They are a zinc alloy body so they are heavier than the later aluminum alloy type 3 and 4 version’s. They also meter fuel in a very different way to the later versions. Because they were a zinc alloy the bodies are much thicker than later versions and Mikuni was able to build a 50PHH out of this body by changing them to aluminum alloy construction.
Type 3 PHH’s were a clean sheet of construction design and kept little from the type 2 design. The big difference was the accelerator pump circuit was turned around and they also incorporated quick change pump nozzles. The jet block holders became removable and were available in independent and homogeneous types. Type 3 PHH’s were available in 40 and 44 utilizing the same body, some people referred to them as S-4 Mikuni’s a quick way to ID them is the 4 cheese head screw that hold down the float cover and the wing bolt that holds down the jet access cover.
Type 4 the final version was another step forward and incorporated an external fuel level adjustment as the single largest advance in the design. They were available in 40 and 44 and shared the same bodies for most OEM versions, and were referred to as S-5 Mikuni’s. Type 4’s can be distinguished by the curved cover next to the fuel pipe that has a nut and screw for setting the fuel level. The tooling was getting to the point that replacement tooling was needed, so to extend production Mikuni developed a new cover for a smaller body 40 that was used on a limited basis for a Toyota engine. In doing so it was a new look and was referred to as the 40PHH as if no other 40 versions existed. The S-4 and S-5 designation was started by Wolf Creek Racing so he could have people ID there carbs when they ordered parts. There are for sure more differences between the versions.
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Re: Early Mikuni Solex PHH44

Post by rwmann »

Thanks. Over to Mikuni Kogyo or Solex (France) for the back-story!
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Re: Early Mikuni Solex PHH44

Post by Solex68 »

I have a pair of new Type 1's if anyone is interested in seeing what they look like :)
They won't fit a roadster, but I have a pair.
.
PXL_20220503_022701879.jpg
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Re: Early Mikuni Solex PHH44

Post by CSP311 »

I use this handy schematic when looking at Solex/Mikuni's
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Re: Early Mikuni Solex PHH44

Post by david premo »

That is a great reference schematic for all the various PHH bodies.
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Re: Early Mikuni Solex PHH44

Post by iloveredmeat »

david premo wrote: Thu May 05, 2022 8:51 am No one knows for sure, but type 1 was likely the 36PHH, type2 is the version that you have and they cam in both 40PHH and 44PHH. You can identify them via the two screws holding the jet access cover on. They are a zinc alloy body so they are heavier than the later aluminum alloy type 3 and 4 version’s. They also meter fuel in a very different way to the later versions. Because they were a zinc alloy the bodies are much thicker than later versions and Mikuni was able to build a 50PHH out of this body by changing them to aluminum alloy construction.
Type 3 PHH’s were a clean sheet of construction design and kept little from the type 2 design. The big difference was the accelerator pump circuit was turned around and they also incorporated quick change pump nozzles. The jet block holders became removable and were available in independent and homogeneous types. Type 3 PHH’s were available in 40 and 44 utilizing the same body, some people referred to them as S-4 Mikuni’s a quick way to ID them is the 4 cheese head screw that hold down the float cover and the wing bolt that holds down the jet access cover.
Type 4 the final version was another step forward and incorporated an external fuel level adjustment as the single largest advance in the design. They were available in 40 and 44 and shared the same bodies for most OEM versions, and were referred to as S-5 Mikuni’s. Type 4’s can be distinguished by the curved cover next to the fuel pipe that has a nut and screw for setting the fuel level. The tooling was getting to the point that replacement tooling was needed, so to extend production Mikuni developed a new cover for a smaller body 40 that was used on a limited basis for a Toyota engine. In doing so it was a new look and was referred to as the 40PHH as if no other 40 versions existed. The S-4 and S-5 designation was started by Wolf Creek Racing so he could have people ID there carbs when they ordered parts. There are for sure more differences between the versions.
Dave
Amazing info Dave, you're a regular encyclopedia!
CSP311 wrote: Fri May 13, 2022 7:41 am I use this handy schematic when looking at Solex/Mikuni's
That's a cool idea.

The image shown here is pretty low-res, where did you find it?

I'd like to see a higher-res image for my quickly aging eyes.

Thanks for posting.
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Re: Early Mikuni Solex PHH44

Post by rwmann »

Wolf Creek Racing calls the early 44PHH a 'Type Q'

http://www.wolfcreekracing.com/index.ph ... &Itemid=51
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Re: Early Mikuni Solex PHH44

Post by david premo »

Yes he did, but in the Mikuni literature they referred to at as a type 2.
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Re: Early Mikuni Solex PHH44

Post by CSP311 »

I have had a couple of requests of where the Solex schematic came from, in my Japan Yahoo auction searching, e.g. Solex (which is ソレックス) the schematic is found sometimes in listings for gasket kits, e.g. https://www.jauce.com/auction/g1051578751

Yep, the res isn't great, but it sure helps me (with my specs on!)

Maybe the schematic put in Wiki...?
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