my centrifical super charger build
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TurtleMann14
Insane plan member
well, i was thinking more along the lines of milling it, but yea
TurtleMann14
Insane plan member
if you think it will work, just remember that it need to be exactly the same all the way around, so i would put it in a dividing head (indexing head)
and then yet it may still be necessary to balance (got a blade balance for a lawn mower?)
and then yet it may still be necessary to balance (got a blade balance for a lawn mower?)
Doc Sprocket
*********
thats what i said i was goin to do lol
frederic
The Junk Man
DIY:
Turbines require a lot more engineering than "fins on a disk" as they're sculped, angled, and tapered causing the air to be drawn in, compressed, and pushed into the engine. This requires tremendous impeller speed, a very good balance, and very tight clearances. The impellers of turbochargers and superchargers often reach into the 80k-100k RPM range.
Can you machine something that precise?
Junkyard Style:
I'll put forth some monkey math to help you sizing junkyard turbos for your lawnmower engine then follow with an example.
(donor CID) x (donor redline) x (qty donor turbo) = (dest CID) x (dest redline) x (qty dest turbo)
The smallest turbocharged car engine I've seen is a 1 liter suzuki / chevy sprint, and 1 liter equates 61 cid. A typical 5 HP briggs has 11.57 cid of displacement.
61 cid x 6000 rpm x ? = 11.57 cid x 3600 rpm x 1
36600 x ? = 41652
? = .1138
The .1138 means a 5 HP briggs can drive .1138 turbochargers as found on a 3 cyl, 1 liter chevy sprint/suzuki samarai engine.
Another way of looking at it is you'd need quantity NINE 5 hp briggs to drive that turbo to it's maximum boost.
The output of most turbochargers is not linear, so if you drive one with 1/10th the cfm you will get quite a bit less than 1/10th the power out of it in the end.
Turbines require a lot more engineering than "fins on a disk" as they're sculped, angled, and tapered causing the air to be drawn in, compressed, and pushed into the engine. This requires tremendous impeller speed, a very good balance, and very tight clearances. The impellers of turbochargers and superchargers often reach into the 80k-100k RPM range.
Can you machine something that precise?
Junkyard Style:
I'll put forth some monkey math to help you sizing junkyard turbos for your lawnmower engine then follow with an example.
(donor CID) x (donor redline) x (qty donor turbo) = (dest CID) x (dest redline) x (qty dest turbo)
The smallest turbocharged car engine I've seen is a 1 liter suzuki / chevy sprint, and 1 liter equates 61 cid. A typical 5 HP briggs has 11.57 cid of displacement.
61 cid x 6000 rpm x ? = 11.57 cid x 3600 rpm x 1
36600 x ? = 41652
? = .1138
The .1138 means a 5 HP briggs can drive .1138 turbochargers as found on a 3 cyl, 1 liter chevy sprint/suzuki samarai engine.
Another way of looking at it is you'd need quantity NINE 5 hp briggs to drive that turbo to it's maximum boost.
The output of most turbochargers is not linear, so if you drive one with 1/10th the cfm you will get quite a bit less than 1/10th the power out of it in the end.
EagleTalons
Master JB Welder
Couldn't you use a compressor for an air conditioning system for this?
i dont no ive never seen one have you got a pic of what thay look like?
anderkart
Moderator
That A/c compressor idea might just work great.
Here's a prety nice AIR pump supercharger installation:
http://www.youtube.com/watch?v=0IsVp6G8JTM
Here's a prety nice AIR pump supercharger installation:
http://www.youtube.com/watch?v=0IsVp6G8JTM
TurtleMann14
Insane plan member
they have used piston pumps before... but i am sure they have moved to rotary pumps for some reason
what about a turbo off of a small diesel? like the 3 cylinders found in some tractors or excavators (still you would need an oil supply that most small engines could not feed)
typo what can i say :/
what about a turbo off of a small diesel? like the 3 cylinders found in some tractors or excavators (still you would need an oil supply that most small engines could not feed)
typo what can i say :/
EagleTalons
Master JB Welder
Most of those turbos are rather large. I have a spare air pump, but I'm thinking the AC units could pack a hell of a lot of PSI.
BriggsTwins
New member
using an ac would work, but they depend on lubrication from the freon, so you run a chance of seizing the pump.
Kenny_McCormic
Kartless....
Smog pumps are supposed to work.
anderkart
Moderator
Maybe it could be rigged up with a small/metered amount of Ester oil being drawn in through the vacuum of the compressors intake air. (kinda like a simple bead blasters, air gun-nozzle works)
BriggsTwins
New member
possibly, definetly something to consider
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