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Forced Induction comes in two forms: Supercharging and Turbo-supercharging. Both work well in a Datsun 1200!
Supercharged A15 twincharger
Contents |
Overview
Also see: * Turbo * SC14 * discussion: s/charged a14
One thing to remember is that a method that works well isn't the only good way.
Quote: Forced induction. This is a subject that was vigorously & robustly debated in an extensive thread not so long ago, so have a play with the search function & you will likely find it.Myself, & a few others prefered the ability of the positive displacement blower to deliver high levels of torque, almost instantly, at very low engine speeds, while a large number of others prefered the advantages that a turbo offers at higher engine speeds. The turbo debate was further broken down into blow through versus suck through.
See if you can find this thread & have a read through it all. With some luck ou will gain an insight of the advantaged & disadvantages offered by each system.
The big discussion: regarding Turbocharging A12. Caution: difficult reading in that discussion.
Supercharging vs. Turbocharging -- what's better?
Generally as the engine revs higher, turbocharging makes more and more power. So does centrifugal supercharging (paxton, etc.), in fact a centrifugal supercharger requires revving the engine up.
By contrast, a rootes-type blower, twin-charger, or screw-charger makes power all through the RPM range and so makes the engine feel like a larger displacement engine. It does not suffer from lag like a turbo does.
Turbo: Less expensive, more HP. Welding skill required Blower: More responsive. Fabricating skills important
Because there are no bolt-on kits available for Datsun 1200 (as of 2014), neither one is 'better'. Either pay a shop $$$ to convert your engine, or use your skills and time to do the same on the cheap. Either way the result is a lot more HP for less money than a traditional Engine buildup.
All have been used in Datsun 1200s, as these photos show.
B&M blown A14 (rootes-type supercharger)
B&M supercharged NAPS-Z engine (rootes-type blower)
Centrifugal supercharger (belt-driven turbine)
Compound Supercharging concept
Twin-Turbo A12
Draw-through vs Blow-through
You can put the carburetor before the blower (draw-through) or after the blower (blow-through). Both work well.
Intercooler
An intercooler can result in far more HP, but requires a blow-through system (boxed carburetor) or EFI port injection. This is because for safety you don't want air-fuel mixture going through the cooler, where it will condense out of the airstream and result in fuel puddles in the cooler!
By keeping the air cool and therefore dense, the same boost will make more HP, because more air is entering the engine. Because it's not overheated, more spark advance can be applied for more HP.
Boost pressure
- 6-7 psi is what a lot of OEM applications use.
- 10 psi is reliable with a stock A12 or A14
- 14.7 lbs gives theoretically double the airflow so max. power would be about 2x stock, but this isn't actually the result. The reason is that the stock induction and exhaust system won't flow this much air under pressure. However, the low rpm torque could approach 2x (at about 2250 rpm) if a small blower is used. So a 130hp forced induction engine will have much more performance than a 130hp NA engine
Induction and Exhaust
Obvious, to obtain more airflow, a higher flowing carb, intake, heads (ports and valves) and exhaust system is beneficial.
Supercharging will increase power on a stock engine, even one with no mods. But increasing the airflow capability of the engine will bring your blown engine to its full potential.
Crank Pulley For Supercharger Drive
The factory pulleys have a bad habit of cracking through the keyway. Use a custom one with a steel crank hub.
Supercharger Setups
Mercedes
datsa73
See datsa73 for Mercedes Kompressor-boosted Datsun 1200
AMR
Wally
See Wally's Wagon: A Supercharged Super Car with AMR300 blower
AMR500
Made by Aisin. Larger than the tiny AMR300 found on Subarus.
Nissan March with MA09S engine
http://khairul120y.blogspot.com/?zx=ed855a7d4fe532ee
rogue
AMR300 from Subaru Vivio with EN07Z 660cc-class (kei car) engine
Eaton Mercedes blower
Autospeed Supercharger article
SC12
Toyota SC12 supercharger
SuperSedan
See main article: SuperSedan
SC14
Toyota SC14 supercharger is the most popular blower swap for Datsun 1200s.
See main article: SC14
go1200
Blower from 1G-G Toyota engine
*2 1/4 inch exhaust with 3 inch crome dumpy to suit coupe *SC14 charger *billet pulleys makes 16psi in top gear at 6200rpm 12psi in lower gears *350 holley
suppafatto
Toyota SC14 is every popular
Toyota SC14 blower oval port lo-comp head watermeth injection hi energy ignition manifolds to suit oval port 32/36 Weber DGV carburetor
NZ2DR
Blown A-series 2-dr from New Zealand
blown1400
Datsun 1200 Utility Supercharged a14 Ross pistons shot-peened valves, con-rods etc. Water-injected supercharger sucks through a 2-inch SU
Photo Index
See Forced Induction A-series Photo Index