Turbo Inlet Manifolds

(Difference between revisions)

Revision as of 00:40, 19 August 2016

Intake manifolds for a Turbo engine. For more airflow, a higher flowing carb, intake, heads (ports and valves) and exhaust system is beneficial. Supercharging will increase power on a stock engine, but increasing the airflow capability of the engine will bring your blown engine to its full potential.

Overview

A15 Turbo using factory Twin Hitachi sidedraft manifold
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#Top-hatted Carburetor on stock manifold
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#Boxed Carburetor
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#Log Manifolds
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#Tuned-port Intake
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Stock Manifold

Blow-through or draw-through systems can use the stock Intake Manifold.

Draw-through
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Blow-through with carburetor hat
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Stock manifold with EFI throttle body
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Blow-through
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With pressure hose adapter
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Log Manifolds

A log manifold is a cylindrical plenum type with individual runners to each cylinder. Log manifolds can either be fed by an EFI throttle body or by a sidedraft carburetor. They can be used with either blow-through or draw-through systems.

Log Manifold
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UM-1 Manifold
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Ram plenum manifold
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clyon's A-series Turbo Manifolds
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This kind of stock manifold-runner is limited in horsepower. The turbo can force more air through it (for more HP) but the air temp will escalate, limiting the power to be made.
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Corolla manifold adapted
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Draw-through with very small plenum
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With air horns (trumpets)
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Tuned Runner Length

For scavenge effect at 5000 RPM, the runners should be 20" long!
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Optimum runner length vs RPM
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Top-hatted Carburetor

Feeding the carburetor via a top hat was a popular OEM method. phunkdotaspok say the stock Hitachi can handle 10 psi with a good top-gasket seal. In an NA application, a warped top is not a problem, as there is no pressure in the float chamber. This only becomes important in boosted application.

Blow-through system feeding carb top-hat
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Weber 32/36 Carburetor with custom top hat
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Twin-sidedraft top hat
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downdraft Dellorto carburetor on custom manifold
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Weber 32/36 Carburetor hat
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Good for 10psi
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Twin Sidedraughts
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Blow-through
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Boxed Carburetor

Blow through works well. The main reason to use this over a draw-through is so an intercooler can be used. The boxed carburetor can take more boost than the top-hatted carburetor.

Boxing the carb allows a more or less stock carb to be used, the outside pressure balancing the inside pressure. Special non-crushable fuel floats are needed.

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