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 Joel
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| posted on March 2nd, 2006 at 06:07 PM |
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Hot Idle Valves
hi all,
can anyone tell me about these, they're a bi metal strip that open and close a port in the base of solex twin carbs on kombis and late type 3s.
i presume they close up when hot to give a richer mix.
im currently rebuilding a set of 32 pdsit and want to remove them as i see them as a potential vaccum leak and older type3s seem to run fine with out
them.
any comments
thanks
Joel
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76camper
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| posted on March 2nd, 2006 at 07:22 PM |
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on my bus that isnt there. Was wondering what was meant to go there... if your going to chuck em away ill take em...
but yea, my bus runs fine without them, got two sets of carbs and both dont have that and run fine...
u2u me or email me if your going to chuck em.
cheers
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Joel
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| posted on March 3rd, 2006 at 04:01 PM |
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76camper i really wouldn't trust these they seem very old and worn probably the same reason yours were removed. there is a little adjuster screw on
them but i've had no luck finding exactly what they do. The carb rebuild instructions just list them as being hot idle vavles
Joel
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76camper
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| posted on March 3rd, 2006 at 10:21 PM |
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hmmmm, if your going to chuck em then u may aswell throw em this way because i will probably end up wanting them in the future and spend months trying
to track them down. If you dont trust them then just take them off and see how the bus runs.... I havent seen a set of carbs with them on but im sure
they serve some purpose... was only 30 years ago these cars were being made lol
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ACE_76
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| posted on November 15th, 2006 at 02:54 PM |
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HELP! Has anyone found any further info. on these little bi-metallic thingies? Have just acquired a new (1970) Auto. Fastback, and it has these. It
idles VERY fast when hot Or warm OR, cold until after you drive a few hundred yards - then suddenly drops back to normal. Can't find any
sticking-anything: linkages. chokes/fast idle etc. all look 'correct'. I can't see ANY mention in ANY Manual & have never seen these before.
Were they only on Autos? Should they be removed/left/adjusted/cleaned/ignored?
[ Edited on 15-11-2006 by ACE_76 ] |
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Joel
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| posted on November 15th, 2006 at 04:13 PM |
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wow old thread
i ended up ripping them off and just blanking them off no probs
they were just a vaccum leak and didnt serve any purpose anymore
i did end up giving them to edward dunno if he did anythign with them
but i also totally forgot i asked the same question about 5 years ago and got an answer
i'll have a look for the thread
but they were only fitted to autos and just opened a port to richen the mixture more when cold to prevent stalling
-Joel
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76camper
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| posted on November 15th, 2006 at 09:07 PM |
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still sitting in my spare parts box.
ACE_76; i think your car might have electric/automatic chokes. When you turn the ignition on current is run through a coil which heats and expands
releasing the choke after a given period. Off this runs a fast idle linkage which, when the choke is on, will engage the throttle shafts and increase
rpm until the choke has heated up and released.
So every time you turn your engine off for say more than 10 mins it will reset the fast idle...
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ACE_76
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| posted on November 16th, 2006 at 01:11 PM |
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Thanks guys. So we may have vacuum leaks too!
Aware of the auto chokes: have backed off the chokes/fast idle mechanisms, but motor still seems to run very rich, when first started anyway. Will
learn more as we go through the tuning process...
I'd still like to know if anyone has any instructions for adjusting the bimetallic valves.
Will probably remove carbs soon and will have a closer look at them.. |
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ACE_76
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| posted on April 16th, 2007 at 09:36 PM |
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*** HELP please!
Has anyone got any info. on how to set/adjust these valves? Have now "reco'd" one carb., and couldn't work out how the thing worked. Just looked
like a potential vacuum leak. It appears to have a small rounded valve partly covering, but not sealing, a hole into the carb base -- maybe there's
meant to be something in the hole? Should the hole behind this little poppet valve part just be blocked off, or is it "OK" to leave as is?
Has anyone got these fitted & operating "as they were when new", who is confident that they don't cause vacuum leaks (or rich running)? I've not
been able to turn up any further info. on these at all, and have not seen them on any other car (other than those previously mentioned here). Ours
are on Solex 32 PDSIT's from early 1970.
*** HELP please! |
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aggri1
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| posted on April 17th, 2007 at 07:40 AM |
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Bump, I'm interested too.
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Joel
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| posted on April 18th, 2007 at 05:25 PM |
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this was the answer i got when i asked the same question back in '02 LOL, i'd totally forgotton i asked it was so long ago
| Quote: | Originally
posted by Andy
Hi Joel,
Not sure on the Type 3's but on the twin Solex Kombi's the hot idle valve (the one mounted on the throttle body below the carb itself) was installed
on Auto's only and opened and extra jet (allowing more fuel in) for a faster idle when cold to prevent stalling, so I guess you can blank it of OK if
doesn't stall when cold. Similarly there is an 'idle mixture enrichment' (next to the central idle adjustment) which also increases fuel when cold,
and shuts off when heated by a resistor. All the ones I've seen have rattled to pieces and I haven't been albe to find a replacement. I have blanked
mine off with no ill effects if the chokes function correctly. I believe they are mostly usefull in very cold climates!
Andy.
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-Joel
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ACE_76
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| posted on April 18th, 2007 at 05:40 PM |
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Thanks Jeol (& Andy)...
I just found this on the Samba (part of a longer article on how to fully tune 32 PDSIT's on early-to-mid 1970's, 1700 & 1800 Kombis):
" The factory provided an cold enrichment device to the central idling circuit when cold and it also attached a "hot-engine idle valve" to the
throttle bodies on auto-trans buses that provides additional idle air to the dual carbs when extra hot. These are both simple bimetals that have a
little brass plug that "un-plugs" when needed. They only need to be clean to work. The cold enrichment device has a resistance heater with a wire
attached to the box. The hot idle compensator is purely mechanical. "
This (allowing air in when hot) seems to contradict the notes from Andy (richening when cold) but maybe they're describing the same thing from
different points. Will figure this out eventually... ! |
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Joel
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| posted on April 18th, 2007 at 05:45 PM |
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well i know for sure now that they were only fitted to autos
i've seen alot since that have just been removed and blanked off
as long as the chokes work they are better off gone
altho i dont even have the chokes working and it still starts fine all year round
-Joel
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