One idiot one solex, part 1

Website · Post by **antiekeradio** » 05 Aug 2006 05:35 pm

19 and 20 are the fuel jets.

16 and 17 are the air jets.

the emulsion tubes will be fixed to the air jets (although drawn separately from the air jets)

it looks like that on this design the fuel jets can only be taken out when the air jets + emulsion tubes are already out of the way.

PS I would strongly advise against the fitting of different jets than stock, unless you have a darn good reason for it and the equipment to test fuel mixture ratios (wideband lamda sonde, etc)
This only gets interesting when you modify camshaft, compression etc.
otherwise its bound to give a lower reliability, lower driveability, AND a much higher fuel consumption than is needed.

Post by **jtbo** » 05 Aug 2006 06:12 pm

I have this K-cam installed, with this some extra fuel might be needed.

I found idle today and adjusted mixture too, but there has to be still something leaking as car runs well at high rpm and full throttle, but part throttle is still quite bad, specially with low rpm, so next I will look those vacuum leaks and fix that renix nozzle thing to get better timing for part throttle area.

Actually I have not looked vacuum leaks at all yet and carb base has only that thin seals, that is very much likely to be reason for smaller throttle problems now.

Post by **jtbo** » 07 Aug 2006 03:43 pm

Ok, now vacuum leaks are eliminated almost completely, still need to find new o-ring to idle cutoff solenoid, but that is not big issue.

I got idle ok, it is bit rich, but this engine has never idled well with less than well rich mixture.

Part throttle area is bit problematic as it is so lean, my O2 meter gives not even single led when I open even a bit of 1st throttle butterfly, O2 meter will lit leds when I do engine braking or lift off foot from pedal, also when I push loud pedal so much that both 1st and 2nd throttle butterfly are open mixture gets bit rich side.

Conclusion: main jet needs to be changed / cleaned again, is there any other possibilities that may cause these symptoms?

I guess that if float height would be too low then it would not be so good with full throttle, it is pulling now really well with full throttle, just part throttle is bad, I usually stall it when trying to park, also can't use 5th gear at all, engine starts to shake too much in low revs...

Maybe need to change old cam back too

Website · Post by **antiekeradio** » 07 Aug 2006 06:18 pm

could well be the normal conditions. carbs need a lean condition on light loads to maintain somewhat of a MPG rating

Post by **jtbo** » 07 Aug 2006 06:28 pm

antiekeradio wrote:could well be the normal conditions. carbs need a lean condition on light loads to maintain somewhat of a MPG rating

Maybe it is, but this really is not running well, stuttering and hesitating, jumping like kangaroo, on highway I need to floor it when doing 80kph@4th to get top of hill without speed going down and that horrible stuttering to start.

I have no way to adjust valves if I switch cams, also never done that before, don't know if it is beyond my skills, but perhaps that is what I should do next as carb is not tuned for this cam

Website · Post by **antiekeradio** » 07 Aug 2006 06:40 pm

yeah when it starts shaking its not OK of course

increase fuel level in bowl a bit first!

Post by **jtbo** » 07 Aug 2006 07:07 pm

Thanks, must try that, there is not too much space left to rise it though, maybe 3-5mm, but even a little may help I have heard.

Post by **jtbo** » 09 Aug 2006 04:37 pm

I have not yet raised float level, but got new seal for idle cutoff solenoid, that seemed to make quite lot of difference actually, it does not stutter nearly as much now, only below 2000rpm it stutter when I change from engine braking to part throttle, quick kick to loud pedal seem to help there so next I adjust float level.

Oh yes and need to fix that renix thing, ignition is running rather late and that won't help at all...

I was thinking about plastic welding too as I have not found proper sized pipe in here, I have one that is too small, but all shops in here seem to miss such products, here is only one toyshop and it sells only girls toys, I'm starting to be afraid a bit about this town

Well anyway, I think that I could melt that plastic a bit and weld it there, only problem is where to get plastic to be used as additive if that is needed. Do you think this idea is worth to proceed, has anyone tried plastic welding ?

Post by **jtbo** » 15 Aug 2006 04:11 pm

Cursed vacuum leaks, today found that carb base were still leaking even I had put plenty of sealant to there, so I made quick fix and it felt better, but still leaking from there, must do that part of fix again with new parts.

Also still missing choke cable attachment nut, so starting is not too nice without choke.

Post by **schakal** » 15 Aug 2006 06:25 pm

jtbo wrote:Cursed vacuum leaks, today found that carb base were still leaking even I had put plenty of sealant to there, so I made quick fix and it felt better, but still leaking from there, must do that part of fix again with new parts.

Also still missing choke cable attachment nut, so starting is not too nice without choke.

what sort of sealent do you use for this job ??
just asking cause sylicone based ones are not recommended as
they react with the fuel and spread all over the manifold and carburettor
blocking passages etc .
however i did use blue hylomar type of sealent and never had problems

Post by **jtbo** » 15 Aug 2006 06:59 pm

It is some black stuff that is designed to work with fuel and also with heat. I have seen someone using same stuff as is used in bathroom, not very good results LOL.

I can't remember now name of my stuff as it is not generally available, got this from friend that supplies bigger garages...

Oh yes, trouble with it was that I did not do very careful job, not first or last time, I believe.

Post by **jtbo** » 16 Aug 2006 04:29 pm

Ok, I think that I give up with this carb and cam combo, even with new gaskets it is not working, stutters, spits and bangs in manifold when using throttle at low rpm, though parking maneuvering is now ok, so vacuum leaks are stopped, I'm pretty sure of it.

Will try to get it trough mot tomorrow I believe, car just needs bit cleaning up and thumbs up that CO is in range.

Post by **Chris_C** » 16 Aug 2006 05:19 pm

You going straight back to injection and squirt after the MOT Jani?

Post by **jtbo** » 16 Aug 2006 06:27 pm

Chris_C wrote:You going straight back to injection and squirt after the MOT Jani?

No, my next car will be where I install MS next time, I think I try to swap cam even I never have done that before and I really have no idea how to prevent timing belt to get loose from crankshaft end.

I could of course test this other carb I do have, but don't think it will be better.

I can drive it rather ok now if I put choke on just to edge where rpm starts to rise, so it gets too much air and too little fuel, but perhaps not leaking anymore. Actually it driver pretty damn smooth with choke.

I'm sure it will pass MOT, but don't know yet what I will do after mot, maybe test other carb before changing cam.

Fuel consumption has been 11-12l/100km now on city so it is not too bad, considering it had air leak and that still it wont drive 100kph@5th gear without flooring it, I think.

Now I did check vacuum leaks all around carb and manifold/head, I did use staring spray and now there was not any change of rpm, just that awful large fireball I managed to create... LOL, got you

Also at engine braking vacuum gauge now goes to last green segment, that can be 10-20kpa, but can be anything else too, well it is at least 10% less pressure in manifold at engine braking now than with old cracked seal part http://www.janiervast.com/kuvat/volvo/problem/ .

Post by **jtbo** » 23 Aug 2006 08:00 pm

I have fixed most of problems in carb now, it is just from 1/3rd throttle to 3/4th throttle where it runs way too lean. It would need more fuel, full throttle is okay, there is no problem at all.

Emulsion tubes, what kind of functionality they do have?
Well, I could swap them, then I would know if it helps at least, there is more holes in secondary than primary.

I understand that main fuel jet is that defines how much fuel can go trough primary circuit, emulsion tube, that maybe changes how strongly fuel is pulled trough main jet, maybe it works so?