pork
Posted a lot
Posts: 1,662
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Here's an idea off how things are looking now in the bay Also gave this a try coz I saw someone else try it and looked fun, not sure what it means, but tell me your opinions
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Well 1. There is air coming out of your turbocharger and into that bag 2. You have clearly lost your mind from all the welding gas
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Yep... Your turbo is working great...
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pork
Posted a lot
Posts: 1,662
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Well 1. There is air coming out of your turbocharger and into that bag 2. You have clearly lost your mind from all the welding gas Haha!
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pork
Posted a lot
Posts: 1,662
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Yep... Your turbo is working great... I guess this is one way of checking turbo works, not sure how well it's working tho, I do still have that massive crack in the exhaust housing, and the turbine wheel has a few chunks out of it (cheap bay stuff)
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 15:50:31 GMT
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Got this lot fitted today Couple of problems 1- to get it started, I have to blow down the float bowl breather tubes (now connected to pitot tube) 2- it won't idle, even with idle screw wound all way in, still pops and bangs a bit too 3- boost/vacuum gauge is very erratic, also when I do give it throttle, it barely shows any boost. I'm still waiting to get O2 sensor I knew I was gunna have problems with tuning, as iv ever done it before Any help greatly appreciated,
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Jan 13, 2013 16:07:09 GMT
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you need to feed the float bowls of the carbs boost .. so that the pressure in the float bowls is equal to or higher than that in the intake manifold ... this allows the carb to function as if they were on a non turbo
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its not a rust hole its air conditioning
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 16:12:41 GMT
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you need to feed the float bowls of the carbs boost .. so that the pressure in the float bowls is equal to or higher than that in the intake manifold ... this allows the carb to function as if they were on a non turbo Hi, those pipes are connected to the pitot tube on the plenum. What I have to do to get it to start is take them off, then blow into pipes, start car, then reconnect
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nitro
Part of things
Posts: 685
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Jan 13, 2013 16:51:28 GMT
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This is looking great mate well done!
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 17:58:02 GMT
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This is looking great mate well done! Thanks. just need to sort these last littke things, then finnaky take it for a spin!!
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Jan 13, 2013 18:58:29 GMT
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That is very puzzling that you have to blow into the breather tubes to get it to start? Does it run n/asp, I think you need to get that done first. I'm wondering if the carbs are flooding, so you have to blow the fuel level down before it will be enough to run, then as the level comes back up again, it gets rough. Does the exhaust smoke or smell when it runs?
An alternative before you get too disheartened if the bike carbs don't work would be a single SU HIF44 carb from a Metro turbo, as they are a similar capacity, dead easy to work with and plenty of support and knowledge to fall back on.
Also, I doubt you would see any boost free reving the engine, you need to load it up to create enough exhaust to build meaningful pressure.
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 19:03:13 GMT
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I'm yet to connect up exhaust properly. just got down pipe from turbo on.
I'm pretty much a novice. So would changing certain jets help with keeping it running? I would like to keep bike carbs as iv put a lot of time and effort in the fabrication of manifolds and plenum and stuff.
I guarantee its something simple a more knowledgeable person would figure out.
Until I learn, I can't fix it
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Jan 13, 2013 19:37:14 GMT
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My experience is with SU carbs, I'm just wondering if your carbs are flooding the engine causing the poor running. I think you need to direct the exhaust somewhere where you can see what's coming out, it would help pinpoint the problem.
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 19:56:03 GMT
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What should I be looking for from exhaust? And what would certain things mean? It's not smokey, there's a bit on start up, but when it's running it seems ok, no noticeable smells lol
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Jan 13, 2013 22:01:57 GMT
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In my experience, a bit of black smoke on a petrol is overly rich, and it makes a horrible eye burning gassy smell.
Do you know anyone that could have a look for you, and are there any recommended base settings for the carbs before final tuning and tweaking?
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Jan 13, 2013 22:25:52 GMT
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I'm thinking it might be lean instead of rich? Since blowing in the overflow means you're blowing petrol out of the bowls into the inlet, enriching (like a choke mechanism or acceleratorpump on larger carbs) and making it start. Also the carbs came from a motorcycle, probably not 1000+cc and probably a lot more efficient (meaning less fuel). Also popping sounds and not idling can be caused by lean mixture.
Try upping the fuel pressure or fuel level in the bowls. Also check what size the jets are currently fitted. The smaller jet of the pair is the idle jet, for a quick and dirty fix is you can drill it to 1mm, that should give you enough juice for idle. Also check the spark plug color to get an idea what is happening. As soon as it's driveable, get it to a friendly MOT station and put it on the gas analyser, nowhere near as good as a dyno run, but it will show you a ball park figure.
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 22:33:09 GMT
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There's a d- shape key underneath that you can adjust the mixture with (which I don't have key for) should I try adjusting this, or just change the jets like you said?
I really need wideband sensor
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 22:33:56 GMT
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In my experience, a bit of black smoke on a petrol is overly rich, and it makes a horrible eye burning gassy smell. Do you know anyone that could have a look for you, and are there any recommended base settings for the carbs before final tuning and tweaking? There's no sign of this, so could it mean that it is lean?
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sowen
Club Retro Rides Member
Posts: 2,245
Club RR Member Number: 24
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Jan 13, 2013 22:43:51 GMT
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In my experience, a bit of black smoke on a petrol is overly rich, and it makes a horrible eye burning gassy smell. Do you know anyone that could have a look for you, and are there any recommended base settings for the carbs before final tuning and tweaking? There's no sign of this, so could it mean that it is lean? Does look like it could be lean then, as joostvdw says, tweak of the carbs and pop the plugs out and have a look. Are the new carbs the same as the first set, if so then you should have some spares bits you could modify (unfamiliar with bike carbs! ). How long have you had it running for so far, and I guess it's just idle that it doesn't do? Does it drive or are you stuck off the public roads?
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pork
Posted a lot
Posts: 1,662
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Jan 13, 2013 23:06:26 GMT
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What should I be looking for on the plugs? Haven't tried it on road yet, might give it a go tomorrow if I have time. So do I need to change the jets? Thanks for all input really appreciate it
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