Solex 40 phh pictures

[jp02ti]

Guys,

I'm having a beast of a time getting my carbs to sync. I have a Unisyn tool, which is really annoying me, so I'm looking into getting something else. I see a couple available, in 2 formats. this first:

http://www.amazon.com/Deluxe-DELUXE-CARBURETOR-SYNCHORNIZER/dp/B0007D20MQ/ref=sr_1_6?ie=UTF8&qid=1285955202&sr=8-6

I've seen this used with good results. not overly pricy, and is fairly simple.

second:

http://cgi.ebay.com/ebaymotors/CARBURETOR-SYNCHRONIZER-2-4-CARBURETORS-NEW-/160486110827?pt=Motors_Automotive_Tools&hash=item255db7b66b

somewhat more complicated, but I expect it to give a much better readings. what I'm not sure of is whether this is a good port on the solex (or weber for that matter) to attach the vac lines. I'm wondering if it would be worth taping the intake stacks with a vac port.

thoughts?

Jon

[Fishhead]

My float level tool works great. I set the fuel level to be "level" with the mark on the carb body (level with the throttle shafts- below the small pressed in plug) and it made it run the best it has to date.

I think I may have found out why the 1800 carbs have the "open port" in them.

If you click on the pic I posted above (with the arrows) U1 jet is labeled as an "idling air bore" and the 1800's have an 0.5 calbr "idling air bore".

1800 info

http://nkbmw.com/t8.phtml

The "idling air drillway" for the '02 is labeled as having a 1.2 calbr "idling air drillway". (quite a bit bigger than the 1800's .5 calbr)

2002 info

http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,336995/

My thinking is the "open port/jet" on the 1800 carbs may be an "idle air correcter' of sorts. The 1800 carbs have a larger idle fuel jet (55- mine came with 57.5) than the '02 (52.5) and my thinking is that the "open port" contributes to/works in conjunction with the larger fuel jet. (mental note- I probably should have tried the 1800 idle fuel jets in conjunction with the open ports, but my thinking/theories got stuck "inside the '02 box"). I used the '02 idle fuel jets with the "open ports" but it popped at idle (too lean).

With my plugged (1800) ports, my idle fuel screws are only open about 1/4 to 1/2 a turn to get the best idle and are very sensitive to any adjustments. In the next few days I will probably pull my "open port plugs" out and experiment with drilling tiny, ahem, calibrated holes in them to see if this will help with the idle mixture adjustability. My off-idle also seams a bit rich at the moment.

On another note, if you look at the "choke" tubes in the above "arrow" pic, where the "idling air bores" get their air from, the choke tubes have a "cut out" to allow air to get to the air bores. Make sure these "cut outs" line up with the idle air bore when replacing them back in the carb. My set on has 1 cut out per choke tube and 1 carb has both of the cast "solex" at the bottom and the other carb has the castings on the top and one on the side when correctly placed in the bore(to line the "cut outs" up with the idle bores).

[jp02ti]

I'm with you on idle jets. mine are only about 1/2 turn out each. my webers are running 2 turns each, which was my starting point. i've ordered the new sync tool, hopefully this will let me get everything dialed in properly!

[Fishhead]

I'm with you on idle jets. mine are only about 1/2 turn out each. my webers are running 2 turns each, which was my starting point. i've ordered the new sync tool, hopefully this will let me get everything dialed in properly!

It looks like the Solex idle mixture screws have very coarse threads in comparison to my Weber 40 DCOE idle mixture screws, so 1/2 a turn for the Solex "seams" about right.

I ended up making a set of "adjustable" idle air mixture plugs (see pic). They are very similar to the plugs I made above, a little longer with a hole all the way through them and threaded to accept Mikuni and Keihin jets (motorcycle application- I got bunches of these). I started with a set of 115 mikuni jets(1.15mm) and they were way too big (my popping came back at anything over idle ). I then went to a .41 Keihin jets and needed to bore them out to .6 to get them closer to what the air passage (02) should be (no more popping at all).

My acceleration used to be "soft" with the completely plugged bores (and 1800 idle air passage), now it is more "crisp" with the .6 jets. I'm not sure on the calculations to get 2 small holes flowing the same rate as 1 larger hole, but my guess-timate was a step in the right direction.

I made the adjustable air jets because I wanted to "test" the idle air circuit before I pulled off the carbs and bored out the stock idle air passage to the 2002 specs. I'd hate to ruin the carbs through "semi-educated guesses" . I'll bore out the stock passages to 2002 specs and replace the "port" block off plugs that I had installed before.

[nate_williams]

Great info here, I will refer back soon once I crack the old PHH's open for a rebuild. Who is currently offereing rebuild kits for these units?

 

Nate Williams

[Slavs]

I believe the 1800ti carbs are a little different from the 2000ti, 2002ti and 1600ti carbs in that that the 1800ti carbs have the short tubes vs. the true emulsion tubes beneath the air corrector jets. Can anybody out there give us input on the 1600ti set-up ? I know that the 1600ti uses the smaller 30mm choke tubes with size 50 idle jets. I've tried to reconfigure the 1800ti carbs to 1600ti specs. The jets were easy. I machined the new chokes. Then somebody informed me about the lack of emulsion tubes on the 1800ti.

 

Slavs

[Honolulu]

Is it heresy to suggest that a O2 sensor and AFM be used for "real" information about whether the engine is running rich or lean at any point?

 

Seems to be the common suggestion for dialing in any fuel injection, and would also work for carb tuning as well.

[jgerock]

Great info here, I will refer back soon once I crack the old PHH's open for a rebuild. Who is currently offereing rebuild kits for these units?

 

Nate Williams

Nate, I believe you can get some parts thru Jaymic in the UK and there is another source thru a guy who sells Alfa Romeo parts (via eBay).  I purchased rebuild kits, 34mm venturis and jets for my PHH's.  Will look for  the source (lead courtesy of Jim Hanks in PNW).  I think the parts shipped to me from CA.

 

[jgerock]

Is it heresy to suggest that a O2 sensor and AFM be used for "real" information about whether the engine is running rich or lean at any point?

 

Seems to be the common suggestion for dialing in any fuel injection, and would also work for carb tuning as well.

I will be installing a wideband AFM in my 69 (eventually) to help tune the dual carbs.

[nate_williams]

I prefer the AEM unit to the Innovate brand. 

 

Nate

[hanksjim1]

Jim, here's the Alfa guy on eBay...very good selection of rebuild kits, jets, etc. for the PHH 40s:

 

http://stores.ebay.com/ALFA1750S-CARBURETORS-PARTS-STORE?_trksid=p2047675.l2563

[jgerock]

Jim, here's the Alfa guy on eBay...very good selection of rebuild kits, jets, etc. for the PHH 40s:

 

http://stores.ebay.com/ALFA1750S-CARBURETORS-PARTS-STORE?_trksid=p2047675.l2563

Thanks Jim!  I was going to look for my receipt.

[jmr_1602]

Just wanted to add pictures of my PHH 40's for posterity. 

 

 

 

(9525)

 

My ports are plugged.

 

34 Choke tubes

 

Is this a date stamp?  (B.1.69)

 

The 2nd carb has #'s that are not in a date format. (B.0.25)

 

 

Close up. (140)

 

 

Edited September 26, 2015 by jmr_1602