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Old 02-25-2006, 12:01 PM
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turbocharging a 350 sbc

hi everyone, just looking at the possibilty of adding a turbo charger to my 355 sbc. any tips, pointers, pictures etc. that may help figure out the best, most efficient, and cleanest way to do it would be greatly appreciated! right now i'm alittle fuzzy on how to best tie into the exhaust. i understand that there will be some home fabrication nedded. pictures would be a tremendous help. thanks in advanced for your time.
keith

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Old 02-25-2006, 12:57 PM
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Fuel injection or carb? thats the question

For something simple keep your eye open for a single turbo draw through setup, I think martin made one. I have seen tons of them on ebay, search for turbo kit, turbo chevy, turbo sbc something like that.
That would be the simplest/cheapest way for a turbo I think.
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Old 02-25-2006, 01:40 PM
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the engine is carburated
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Old 02-25-2006, 02:01 PM
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cheapest way would be something like this

http://cgi.ebay.com/ebaymotors/Rajay...QQcmdZViewItem

or this

http://cgi.ebay.com/ebaymotors/Turbo...QQcmdZViewItem

Both of these mount the turbo on one side and bring the exhaust form the other side to the turbo side. They both use a draw through manifold.

If you do not want to go draw through (which I think would be easier to tune) you would have to have the carb setup for blow through. Theres a ton of options, and variables in doing what your looking into, I dont really know where to start. You could spend a week search the internet and reading all kinds of different setups.

I guess I would start by figuring out how much power you want to make. If you just want a little boost of power thats always there, a kit like the two above might be the thing. If you want to make serious power you will probibly have to build a entirely new engine.
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Old 02-25-2006, 03:07 PM
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This link is one of the best sites for turbo information. There is a section for chevies, do-it-yourself projects, efi, and carbs. Read some threads and do a search. There is a lot of information out there!

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Old 02-25-2006, 07:29 PM
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I bought a book called Maximum Boost by Corky Bell. Very infomative and a great reference.
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Old 02-26-2006, 06:05 AM
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thanks for your replies, i will surely check out the links and the book.
keith
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Old 02-26-2006, 08:56 AM
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If you're using a carburetor, definitely go the blow-through route, as you will have many more options on how to plumb the system.

If you are using a Holley or Demon carb check out this link for some good info on how to modify it for blow-through: Carbs Mods. That is a good starting point.
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Old 02-26-2006, 05:19 PM
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Quote:
Originally Posted by orangef4
If you're using a carburetor, definitely go the blow-through route, as you will have many more options on how to plumb the system.

If you are using a Holley or Demon carb check out this link for some good info on how to modify it for blow-through: Carbs Mods. That is a good starting point.
Just remember if you pressurize the carb, you must pressurize the fuel system with boost. Otherwise your 6-7 pounds of fuel pressure will be fighting against manifold pressure. an easy way is to run a line from the pressure side of your intake to the air vent hole in the mechanical fuel pump(after you drill it out and thread it). This way your fuel system is kept at a base pressure of your intake plus fuel pressure.
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Old 02-26-2006, 05:31 PM
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Draw thru's also are more prone to sucking oil through the seals due to the vacuum by the closed throttle blades. Just something to consider.
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Old 02-26-2006, 05:42 PM
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Quote:
Originally Posted by stroker_SS
Draw thru's also are more prone to sucking oil through the seals due to the vacuum by the closed throttle blades. Just something to consider.
Actually you get a surge of turbo pressure against the throttle when it is shut suddenly. That is why you have the pop off valves that make a diesel truck go wheeee every time they shift.

Boost pressure will blow by the rings and unless properly vented, will blow out the crankcase seals. That is why blown cars have vacum pumps on their crankcases.
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Old 02-26-2006, 05:57 PM
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I was referring to the turbo's seals, but that surge valve thing just dispells somebody elses advice. Thanks for setting things straight.
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Old 02-27-2006, 07:38 AM
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For a draw-through, the turbo seals need to be changed to carbon seals.

Draw-through acts like an inter-cooler as the gas passes the turbo. Not good for cold conditions. Have driveability issues under 50 degrees due to extreme fuel cooling.

I think it would be better to go with blow through.
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Old 02-27-2006, 09:19 AM
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Quote:
Originally Posted by 454C10
For a draw-through, the turbo seals need to be changed to carbon seals.

Draw-through acts like an inter-cooler as the gas passes the turbo. Not good for cold conditions. Have driveability issues under 50 degrees due to extreme fuel cooling.

I think it would be better to go with blow through.
Right, in certain temperature conditions fuel will condense and puddle in the intake trac and manifold. Spectacular explosions sometimes occur!
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