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Jan 13, 2011 22:27:24 GMT
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cool. yeh thats a blow through carb, turbo setup. more complicated then a draw through carb. much better design but more complicated as the carb needs to be able to hold pressure and it also needs a boost referenced fuel pressure regulator (think thats it beside the coil) and high pressure fuel pump. i see one turbo feeding the carb top hat. but where does the other pipe coming from the top hat go? is there another turbo on the right hand bank? the turbo looks a fair size so i'd have thought two would be overkill. is that a micro dynamics ignition retard control box i see, next to the clutch master cylinder? with the right gaskets there should be no problems with that set up. looks like a well thought out kit. and should be fairly reliable with low boost, 7psi max. thou i'd personaly fix the carb and fit an intercooler and jam 10-15 psi into it ;D with the correct fueling of course and see what happens
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 14, 2011 10:29:50 GMT
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You've answered a lot of questions for me in that post cheers! Yes that is a fuel regulator next to the coil, need to have a look what fuel pump it is running next time i'm at home. The car is a single turbo, The pipe coming off the top hat on the other side is open, goes to nothing, is there something missing or something that could be put there? The micro dynamics box is a rev limiter, unplugged at the mo as was causing the car to stutter around the 2-2500k rev range, lots of tests brought the problem back to that. watching another one on ebay at the moment as don't want to run big boost without a limiter. My plan is... see if i can get a gasket set made up, fit an intercooler and give the engine some real pipework, fit the rev limiter back on and see how that runs, with it being more efficient it may be more reponsive, if not, turn the boost up
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Jan 14, 2011 12:52:45 GMT
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err, if you mean that there's only a turbo running off the exhaust on ONE bank of exhausts, it aint really doing you any favours to getting it to run nicely (one side will have oodles of backpressure from the turbo, the other will just have whatever the exhaust is giving)
Fuelling would be "interesting" to get it right....
Also, if that other pipe is truly open, that also means your boost is just being vented to atmosphere. Quite possibly designed to be fed by the other turbo (which you say isn't there)
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You're like a crazy backyard genius!
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Jan 14, 2011 12:55:00 GMT
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ie: Slap another turbo on there my son!
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You're like a crazy backyard genius!
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Jan 14, 2011 19:47:50 GMT
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i'm guessing if it is single turbo then there will be a crossover pipe for the exhaust so that both sides are driving the turbo. i hope that that is a soft cut rev limiter, otherwise it may cause harm then good. thats confusing about the extra pipe off of the top hat is there any valves or somthing in it? maybe a blow off/dump valve of some sort? if it is just open, then the turbo pressure would just go straight out.
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Chairchild, The exhaust on the left bank does have a crossover pipe to the other side then into the turbo! The rev limiter is a soft cut system yes. Yes there is nothing on the end of the pipe on the left. I hadn't really thought about it until i have started looking at it. I guess that is where i should fit a dump valve then!
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Jan 15, 2011 12:19:36 GMT
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Indeed! If the manifolds are linked, then it's more than likely meant for a dump valve Any chance of a pic of the crossover pipe+manifold? Would be interesting to see
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You're like a crazy backyard genius!
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 15, 2011 13:34:12 GMT
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Yea, i'll get it up in the air and have a good look underneath, taking lots of photo's for guidance by you kind gents!
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 17, 2011 12:14:00 GMT
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Just found a couple of photo's that i really liked of the two cars, you can see that in this pic the light surrounds of the GTC have been sprayed body colour
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cozjon
Part of things
Posts: 253
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Nice looking car:), to be honest if it was mine I would not bother fiting a dump valve if you are not running massive psi I would just block the hole up. would also check the boost pressure after that and get a proper rr set up well worth the money, is a lot cheeper than a blown engine.
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 30, 2011 15:07:38 GMT
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Being doing some more research into the engine set up etc and found a few simple thing's i didn't know. The pipe from the air filter feeds straight into the head cover and then into the turbo, why would that be? The top hat thgat we are talking about has a mesh inside, like so and then found that it has a tiny dump valve fitted inside the left hand tube, so quiet i never hear it! I haven't managed to get it up in the air yet so no pics of the manifolds but i will put some up! Been looking at charge coolers compared to an intercooler, from what i have read a charge cooler would be best but for cost reason's i'm going to go for an intercooler and try and get a box for the carb made up.
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Jan 30, 2011 15:49:14 GMT
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What gaskets are blowing? The main carb to manifold one? I wonder if you could make copper crush type gaskets for it?
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Jan 30, 2011 17:16:30 GMT
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ahh, so it was a dump valve. cool. it's normal for the rocker cover to vent into the intake piping. thou there should be some kind of oil trap to stop to much oil going into the intake, maybe worth getting an oil catch tank of some sort? there does seam to be a lot of oil in the top hat. wonder if thats because the turbo's worn or if the piston rings are worn and it's blowing a lot of oil out the rocker cover vent.
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teaboy
Posted a lot
Make tea, not war.
Posts: 1,875
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Jan 30, 2011 17:20:36 GMT
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I was considering converting it to efi and then megajolt Nice car. Remember, there is nothing a carb can do that proper EFI can't do better.
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 30, 2011 17:36:52 GMT
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The rings on the pistons are fine, the bottom end had a full rebuild only last year so they are fine, we think that the turbo isn't great. had thought abought changing the turbo for a more modern version or just replacing it for another. There is a lot of oil around the system, Could it be that the oil is getting into the intake then through the turbo over to the carb? so if we put an oil catch that could help the situation?
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Jan 30, 2011 17:59:36 GMT
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some kind of oil catch tank really needs to be between the rocker cover vent pipe and the intake pipe. some people would just fit a small air filter looking thing to the rocker cover and blank off the hole in the intake pipe, that a bit of a bodge really. i'd run a pipe up, out of both of the rocker covers, then into a catch tank and then into the intake pipe. you'd need to empty the catch tank every so often. or rig up some kind of oil trap so only vapors go into the intake.
while you have it all apart, check for movement in the turbo shaft, side to side is ok, but there should be no movement in and out. you'll notice if there is oil leaking past the seals.
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Jan 31, 2011 11:21:11 GMT
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Cheers, i shall have a look at the breather and see how i could link them to an oil catch tank. The right bank is linked into the air intake but the left bank isn't linked at all, however it does have a breatheable oil filler cap. I'll have a look at a catch tank and see what i can do. I'll check the turbo out, cheers!
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mrluke
Part of things
Posts: 237
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Bookmarked... Also have a 2.8 cologne with a 38 dgas... interesting. Do you know what sort of power yours makes?
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super66
Part of things
Singer Chamois Coupe 1969
Posts: 396
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Yay, another follower! Well when we bought it, we had a dyno printoff at 240BHP, but the turbo isn't turned up as much as it was then, i'd guess around 200bhp at the mo. Once all this work is complete i will get it on the rolling road and we shall see!
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I'm going to guess, that rather than being a dumpvalve (controlled by vacuum signal) but rather it's a "sneeze" valve. If the manifold pressure went past a certain point, it would open, and allow the excess pressure to vent. It's more of a safety item than anything else.
I'd happily say to NOT attatch the breathers to the intake piping, nor to attatch a catch-can
A catch-cans main purpose, is to stop oil that's leaking out of breather pipes, on heavy corners, during racing. They won't collect hardly any oil, if you have a clean oil filtering unit on the output of the breathers (oil vapour doesn't really condense, like water - it's pretty much just tiny oil droplets that make the mess)
You *could* go the effort of making a proper filtering system - but the easiest way is to just extend the breather pipes to somewhere you wouldn't mind it being oilly (gear linkage for instance) and just shove on some of those cheap breather-filters. The filters are only there, to stop dirt entering the engine on cooldown (as the internal crankcase gasses cool, and contract). On my last car, I just had a robinsons squash bottle, filled with scouring pads, a few holes around the bottom, and the breather hose shoved in the top. Made the nearside driveshaft oilly, but I didn't care...
And oil into the intake tract, reduces the effective octane of the fuel - which is bloody important on a turbo car!
Not quite sure of the mesh inside the hat - maybe to help reduce turbulence?
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You're like a crazy backyard genius!
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