Comparing stock Solex carbs to each other, and to the H30/31

[herbie1200]

[herbie1200]

I have to do a little correction to this image:

On 28 carburetors without idle bypass channel the lower hole, when the butterfly is in the idle position, is exposed on its LOWER part because into those carburetors idiling is by a partial opening of the butterfly that is never fully closed (it should be fully closed into 30-31 pict series that have an hole directly on the butterfly).

An other issue: at idiling a small quantity of air jumps from the upper pipe to the lower hole and this air contributes to the idle air/fuel mixture.

So when clogging the upper advance pipe idle is enriched and an adjustement is necessary.

I tried the SVDA... engine works better, quieter and more power, especially at constant speed, so I will keep my configuration.

[tb03830]

OK, after reading this and becoming fully confused I got that my H30/31 PIC Carb will not work with my SVDA. What distributor should I use is my question now? I am not inclined toward a .009 Distributor. I have a 12v 1200cc SP and am not looking for power but smooth operation. I think a vacuum advance is needed so can someone recommend the right distributor for my H30/31 PIC. the Carb has a riser for the 12v Generator.
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"Sic Vic Pacem, Para bellum - Pray for peace, prepare for war."

1964 Convertible Bug - 1600cc SP engine with a stock H30/31 Carb and SVDA Distributor - Swing Arm Highway Flyer Tranny, Gene Berg's Temperature Dipstick, 2.5" drop spindles, 2" narrowed adjustable front end. Chromed OEM fan tower.

[vamram]

Does your H30/31 have the vacuum fitting at the lower right when you're looking at the back of the carb? I've read elsewhere recently that this fitting has a sufficient vacuum signal to work w/the SVDA vacuum can.

Other than that possibility I don't know the answer.
_________________
Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!

'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!!

[wcfvw69]

[Cusser]

[tb03830]

[tb03830]

So at lunch I had my son meet me and we took the vacuum tube off the side to the HJ30/31 PIC Carb and put it on the large one on the front of the engine. It immediately started running better. So another question.

I noticed if I had the vacuum ports covered and no vacuum going to the Dizzy it was idling at about 7.5 degrees (ish). when I added the vacuum it jumped up to about 30 (ish) degrees but I have no way of determining that. What should it idle at in terms of degrees when connected properly to a vacuum?

With a stock pulley how do you determine 30-40 degrees and such?
_________________
"Sic Vic Pacem, Para bellum - Pray for peace, prepare for war."

1964 Convertible Bug - 1600cc SP engine with a stock H30/31 Carb and SVDA Distributor - Swing Arm Highway Flyer Tranny, Gene Berg's Temperature Dipstick, 2.5" drop spindles, 2" narrowed adjustable front end. Chromed OEM fan tower.

[Cusser]

[Lingwendil]

[ashman40]

[kwest69]

I can report that port "D" on my H30/31 produced a strong vacuum when 'blipping' the accelerator off of idle. A reproduction SVDA & the H30/31 worked well when I used this vacuum port and:
- I timed it for ~ 32d total advance at high rpms and this yields about 7d BTDC at idle (hoses plugged) for me - I was happy to see that number come up...


I've since moved to the proper carb for my year (from Volksbitz) and the proper distributor (from Tim (tasb)) and I'm a bit happier, but the combination above seemed decent.

HTH,
Kent

[Lingwendil]

[glutamodo]

Well, all the ones I checked were drilled like this (I thought I had stuck this in this thread somewhere already, but maybe not, as I'd rather edit the first post and put this in there, but cannot, as it's so old of a post) And yes, this is very similar in appearance and function to the SVDA carbs' vacuum advance drilling.

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Andy T.


IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox.

[vamram]

Knowing this about port D, what about ports B & C? Do either one provide the signal necessary to run a DVDA distributor's [EDIT] retard vacuum, say a 205AN or AJ?
_________________
Eventually, "we are what we pretend to be.’”
Give peace a chance - Stop Russian-Soviet Aggression!!

'74 Super 9/16 - present, in refurb process.
'73 Super - 6/18 - Present - Daily Driver!
'75 Super Le Grande...waiting it's turn in line behind '74.
Click to view image
Save the Supers!!

[Lingwendil]

[glutamodo]

Just one, and that's why I did NOT say it was exactly the same but it really depends on WHICH post-1970 stock carburetor you're looking at. There IS a photo of a 31PICT-3 (which is pretty much the same carb as the H30 except for the main vacuum advance plumbing) with just one drilling at the throttle butterfly, on the first page of this thread.

And it's not like I've not test-run that angled fitting myself, I have and it works. The thing I don't like about it is the need to keep the hose clear of the throttle arm. That's why I routed it this way:

_________________
Andy T.


IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox.

[Frodge]

I have a recently, beautifully restored 205t. Where can one find a spare vacuum can?

[glutamodo]

buy some cheap used distributors hoping you'll get a decent one or dig around for an NOS canister, but the only I've seen lately was pretty pricey. http://www.ebay.com/itm/Ignition-Distributor-Singl...mp;vxp=mtr
_________________
Andy T.


IMAGE NOTE: It has been noted that Chrome based browsers may have issues in displaying my vast image library, which use non-secure links and are on an FTP server. Images should still be viewable if the link is clicked though.
I do not know how to fix this. All I can say is it all works fine for me with what I use, Firefox.

[tb03830]