Toyota Corolla FX GT
1993 AE101 20v 4A-GE
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This page is a work in progress as I gather information on each of theses motors.
Toyota ceased production of the silvertop motor in 1995. At this time a new version of the 20v 4A-GE was produced. The new motor has a black cam cover and was therefore named 'blacktop'. There are several differences between the two, but there is some argument over which engine is 'better'.
Technical Comparison
|
Silvertop
|
Blacktop
|
|
| Capacity |
1587cc
|
1587cc
|
| Compression |
10.5:1
|
11:1
|
| Bore |
81mm
|
81mm
|
| Stroke |
77mm
|
77mm
|
| Inlet cam lift |
7.97mm
|
8.20mm
|
| Exhaust cam lift |
7.60mm
|
7.60mm
|
| Inlet cam duration |
?
|
?
|
| Exhaust cam duration |
?
|
?
|
| Con rod weight |
515g
|
significantly lighter
|
| Pistons |
cast, 5 deep valve recesses
|
cast, 3 small valve recesses
|
| Oil cooled pistons |
yes
|
yes, lighter
|
| Oil hole in rod |
yes
|
no?
|
| Throttle body entry |
45mm?
|
48mm
|
| Throttle body butterfly |
43mm
|
45mm
|
| Trumpets |
plastic
|
larger, rubber
|
| Surge tank |
.
|
larger
|
| Inlet manifold |
teardop or oval shape*
|
teardrop shape
|
| Idle control vacuum |
external collector
|
in face of inlet manifold
|
| Inlet ports |
.
|
larger, polished?
|
| Exhaust ports |
.
|
approx 20% larger, polished?
|
| Port dividers |
no
|
yes
|
| Combustion chamber |
closed
|
open
|
| Exhaust manifold |
4-2-1
|
larger, less internal restrictions
|
| Flywheel |
.
|
lighter
|
| Gudgeons |
20mm
|
20mm
|
| Con rod big ends |
48mm
|
48mm
|
| No of block ribs |
7
|
7
|
| Timing belt tensioner |
.
|
hydraulic
|
| Alternator connector |
.
|
revised
|
| VVT, ECU |
D-Jetronic
|
revised
|
| AFM / MAP |
AFM
|
MAP
|
| Peak Power |
160bhp@7400rpm
|
165bhp@7800rpm
|
| Peak Torque |
16.5kg/cm@5200rpm
|
16.5kg/cm@5600rpm
|
* There are 2 types of inlet manifold on the silvertop - one which resembles a teardrop shape fitted to facelift (93.5 on) AE101s, the other more like an oval with a cutout extending from the top of each port fitted to early (up to 93.5) AE101s. The teardrop shape far outflows the oval.
Visual differences: