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Right,if the exhaust entrance of a turbo has an area of approx 3.2" square, would there be any point in having a pipe leading to it with an area any greater than this? I figure if that's the smallest point of a pipe run,it makes no difference having a bigger area anywhere else....or does the action of the spinning turbine counter act this in any way...  |
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do you mean the inlet to the turbine?
If so then you want a relativly small area to keep velocity high an minimise surface area and heat loss.
??
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Yes,i mean if the entrance to the turbine has an area of 3.2 (ie,the actual turbo casting) there would be no point in having the exhaust pipe leading to it with a greater area??
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No turbo or exhaust heads on here then?
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I don't quite see what you are getting at. Most manifolds will have runners leading to the turbo mounting flange not one single tube. Or are you trying to make an adaptor to fit a turbo onto a stock n/a manifold?
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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I have two cylinder banks joining into one pipe going to a turbo.....the entrance on the turbo casting flange to the turbine housing has an area of 3.2" square, the same as a 2" pipe. This bit....the rounded off rectangle hole  So my question is,is there anypoint in having a pipe bigger than 2" leading to that flange? |
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I see. In that case no, there isn't. If the pip is any bigger than it needs to be then the velocity will drop and as surface area increase as James said. reduced velocity would also probably mean slower response too.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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Excellent.....it's always good to have stuff confirmed,thanks  |
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Seth
South East
MorrisOxford TriumphMirald HillmanMinx BorgwardIsabellaCombi
Posts: 15,542
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I would have thought you'd want to try and form the end of the 2" pipe into that rectangular shape towards its end to help flow in that example. But that is probably so obvious so I haven't said it really. |
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Follow your dreams or you might as well be a vegetable. |
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Yeah,i'll be trying to do it so it mates to the flange exactly,any improvement is going to better than the bodge that's on there now!
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A square isnt round though  so cross sectional area is the same but the "Hydraulic Diameter" isnt You will need to increase tube size to compensate for the greater circumference There is a formula for it but I cant remember what it is...... James might know or Google "Hydraulic Diameter"..... Its needed whenever you stray away from a round tube and want to maintain flow HTH Dom |
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A square isnt round though so cross sectional area is the same but the "Hydraulic Diameter" isnt You will need to increase tube size to compensate for the greater circumference There is a formula for it but I cant remember what it is...... James might know or Google "Hydraulic Diameter"..... Its needed whenever you stray away from a round tube and want to maintain flow HTH Dom As it'd only be the last couple of inches of tube that'd be squared I don't think he need worry too much. The squared section can only be as big as the turbo inlet anyway otherwise you end up with a power robbing step there. It might well be a consideration if the squared tube were long though. |
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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A square isnt round though so cross sectional area is the same but the "Hydraulic Diameter" isnt You will need to increase tube size to compensate for the greater circumference There is a formula for it but I cant remember what it is...... James might know or Google "Hydraulic Diameter"..... Its needed whenever you stray away from a round tube and want to maintain flow HTH Dom So it's the cricumference of the hole I need to match,not the cross sectional area? That'd be handy,because that's the same as a 2" pipe too. |
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A square isnt round though so cross sectional area is the same but the "Hydraulic Diameter" isnt You will need to increase tube size to compensate for the greater circumference There is a formula for it but I cant remember what it is...... James might know or Google "Hydraulic Diameter"..... Its needed whenever you stray away from a round tube and want to maintain flow HTH Dom So it's the cricumference of the hole I need to match,not the cross sectional area? That'd be handy,because that's the same as a 2" pipe too. Theres more to it than that which is why I said do a search  |
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Theres a book By Corky Bell called maximum boost and it tells you everything you need to know well worth a read.
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Theres more to it than that which is why I said do a search Well tie me upside down,strip me naked,cover me in flour and birch me for asking. |
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Do you not think if it was as simple as matching circumference I would have said that You asked the question, didnt follow the advice freely given and then quoted me making your own assumption that was wrong. I corrected that statement as it would be misleading to others who may want to search further...... you asked for advice and received it freely...... I'm not responsible if you don't follow it or understand it am I |
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bstardchild
Club Retro Rides Member
Posts: 14,962
Club RR Member Number: 71
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Well tie me upside down,strip me naked,cover me in flour and birch me for asking. Thats an image that's gonna stay with me all day now ;D |
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Do you not think if it was as simple as matching circumference I would have said that You asked the question, didnt follow the advice freely given and then quoted me making your own assumption that was wrong. I corrected that statement as it would be misleading to others who may want to search further...... you asked for advice and received it freely...... I'm not responsible if you don't follow it or understand it am I Godammit man chill.....turn that frown upside down!! (if this forum had a laughing smilie,it would've been attatched to my post as a light hearted responce to your tutting with distain i'm better than you rolling eyes smilie)  |
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Well tie me upside down,strip me naked,cover me in flour and birch me for asking. Thats an image that's gonna stay with me all day now ;D I have pics of a previous occasion if you like? |
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so cross sectional area is the same but the "Hydraulic Diameter" isnt
