Mild recipe (+5hp): Moderate recipe (130-150 hp): Emissions? bah! It's all out racing here (150-200hp):

Of course, the latest 20-valve VVT 4A-GE will give you 165hp without
any mods... and be very streetable, fuel efficient and pass emissions.
That's called progress ;)

The VVT camwheels may be adaptable to older 4A-GE's (maybe other
engines too)... if you are REALLY DIY-oriented.

or the forced induction route:

turbocharging
supercharging (changing to a 4A-GZE would be easy...)

or both, known as twincharging... See Toysports project cars


A short 4A-GE history of versions:

MR2 vs FX-16: MR2 cams slightly more agressive in Euro spec (124 vs 122hp)

Euro vs US: Euro has higher compression (10 vs 9.4)and no cats (in MR2,
124 vs 112hp). Also D-jet (map sensor) instead of L-jet (afm) for less
pressure drop.

pre-87 vs post-87: injector spray pattern improved, 1-3hp more.
also stronger bottom end (crank, rods, wrist pins). 
Is this the "red top" vs "blue top" change?

1990 or so, TVIS dropped, 9.5 or 10.3 cr, power up to 130hp.
intake ports smaller to gain back some low end since no TVIS???

1991 20-valve version with VVT and 165hp debuts, old 130hp version remains in
production too.

And to confuse you a bit further, there have been 5 different
hp standards in the lifespan of the 4A-GE's:

JIS gross and net, SAE net, DIN metric and DIN imperial.

DIN metric and imperial diffe only in kW to hp conversion, 
imperial hp figures are 1% lower. SAE net and JIS net are 
reasonably close to the DIN figures. JIS gross figures are
higher (difference varies a lot, 0-10hp). Switchover to
JIS net was around 84-86.


Return-Path: [email protected]
Date: Wed, 3 Jul 1996 10:37:12 +1200 (NZST)
X-Sender: [email protected]
To: [email protected]
Subject: 4age Head flow figures
Sender: [email protected]
Precedence: bulk

I thought the following head flow figures may be of interest to some members
of the group. These are from a friends engine that he is building for circut
racing.

If any one has any comments or suggestions we would be interested. We still
have not decided on the Cams to go with this head. He wants power from 4000
rpm to 8000rpm. Some one with a fancy dyno program that takes into account
head flow figures may have some fun with the information below.

These figures are on a 4age small inlet port redtop engine without TVIS.

The combustion chamber has had the Joggles removed as per the TRD
specifications for the group A race and rally engine. The exhaust port has
been cleaned up just behind the valve seat. The valves have been given a
three angle cut. The valve guides have been cut shorter so they do not
intrude so far into the ports but they have not been shaped. No other work
has been performed.


Had flow figures. I0 inches of water.  

In                              ex
Lift            CFM             Lift            CFM
0.060"          31.5            0.050           17.0
0.120"          65.0            0.100           39.7
0.180           94.4            0.150           62.6
0.240           108.4           0.200           75.9
0.300           111.1           0.250           82.0
0.360           112.5           0.300           84.6

Other engine modifications
Lightened flywheel 9lb
Bore and Stroke: Bore = 81mm Stroke = 77mm

Pistons standard 10.3:1 pistons with thin head gasget.

Exhaust valves standard
Exhaust port smallest diameter 21 mm  
85mm exhaust face to valve face
Exhaust Primary length 775 mm

Inlet valves standard
Inside diameter of primaries 30.5 mm
Inlet port smallest diameter 25.5 mm
85mm inlet face to valve face
inlet manifold 52 mm face to face
carb/inlet manifold 10 mm
carburettor length 118 mm
current inlet trumpet length 42 mm
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