Official 4A Specs Thread

[BigMike]

This list is a work in progress

Variant	1	2	3
Approximate Dates	1983.05-1987.07	1987.08-1989.08	1989.09-1992.05
Compression	9.4:1	9.4:1	10.3:1
HP	112	115	130
T-VIS	Yes	Yes	No
Intake Port Size	Big	Big	Small
Piston Wrist Pin (mm)	18	20	20
Connecting Rod Big End (mm)	40	42	42
Crankshaft Main Bearing (mm)	48	48	48
Other Features	3 rib block	7 rib block, stronger bottom end larger con rods HP gains f/ remapped ECU	External oil drain, Different ignition system, Smaller diameter spark plug cords, Oil squirters for pistons

Engine	Cam Cover	Power (kW)	Power (HP)	Torque (lb-ft)	Year	Car Models
4A - GZE	No Colour	120	165 @6400	152 @4400	91.6 - 95.5	AE-101
4A - GZE	No Colour	120	161 @6400	152 @4400	90.10 - 91.6	AE-92
4A - GZE	No Colour	108	145 @6400	137 @4400	87.5 - 90.9	AE-92
4A - GZE	No Colour	108	145 @6400	140 @4000	86.8 - 89.10	AW-11
4A - GE 20V	Black	123	165 @7800	120 @5600	96.6 -	AE-111
4A - GE 20V	Silver	120	161 @7800	120 @5600	91.6 - 95.5	AE-101
4A - GE	Red	100	134		89.8 - 92.8	AT-170
4A - GE	Red	100	134 @6800	1105 @6000	89.5 - 92.4	AE-92
4A - GE	Red & Black	88	118		88.5 - 89.7	AT-170
4A - GE	Red & Black	88	118 @6600	100 @4800	87.5 - 89.4	AE-92
4A - GE	Blue & Black	88	118		85.8 - 88.4	AT-160
4A - GE	Blue & Black	88	118		85.8 - 87.8	AT-160
4A - GE	Blue & Black	88	118		85.8 - 87.7	AT-160
4A - GE	?				85.6 - 89.10	AW-11
4A - GE	Blue & Black	88	118 @6600	98 @4800	84.6 - 85.5	AW-11
4A - GE	Blue & Black	88	118		84.10 - 87.4	AE-82
4A - GE	Blue & Black	88	118		83.5 - 87.4	AE-86

Valves	16	16	16	16	20	20
Cam Box Colours / Lettering Colour	Blue & Black on Silver background	Blue & Black on Silver background	Red & Black (previous motor still in USA)	Red on Silver background	Chrome on Silver background	Black background
Car Model	AE82/AE86	AW-11	AE-92/AW-11	AE-92	AE-101	AE-111
Year	83/5-87/5	84/6-87/5	87/5-89/5	89/5-91/6	91/6-95/5	95/5-
TVIS	Yes	Yes	Yes	No	No	No
Intake port size	Large	Large	Large	Small	4 Throttle	4 Throttle
Gudgeons	18 mm	18 mm	20 mm	20 mm	20 mm	20 mm
Conrod Big Ends	40 mm	40 mm	42 mm	42 mm	42 mm	42 mm
Main Bearings	48 mm	48 mm	48 mm	48 mm	48 mm	48 mm
Injection Type	MAP (Japan/UK)	AFM (US/Europe) MAP	MAP (Japan/UK?)	MAP (Japan/UK?)	AFM	MAP
EFI	D-Jetronic	L-Jetronic	L-Jetronic	D-Jetronic	D	D
No of block ribs	3	3	7	7	7	7
Oil Cooled Pistons	No	No	Yes	Yes	Yes	Yes
Power (kW)	88 @ 6600	88 @ 6600	88 @ 6600	100 @ 7200	120 @ 7400	123 @ 7800
Power (HP)	118 @ 6600	118 @ 6600	120 @ 6600	140 @ 7200	160 @ 7400	165 @ 7800
Torque (kg-m)	14.5 @ 5200	14.5 @ 5200	14.5 @ 5200	15.0 @ 6000	16.5 @ 5400	16.5 @ 5600
Bore x Stroke	81.0 x 77.0	81.0 x 77.0	81.0 x 77.0	81.0 x 77.0	81.0 x 77.0	81.0 x 77.0
Compression	9.4	9.4	9.4	10.3	10.5	11
Octane	Low	Low	Low (USA)	High	High	High

Sources:
http://www.ae92gts.com/ae92gts_engine_type.html
http://webspace.webring.com/people/xu/um_10670/4ageengines.html
http://www.kalalahti.com/dataBySubject/GasolineEngines.html

[BigMike]

Fuel Injector Flow Rates

4A-GE TVIS big port	182cc/min
4A-GE Small port	235cc/min
4A-GZE	365cc/min
20v	295cc/min

Source:
http://www.billzilla.org/4agstock3.htm

[BigMike]

Cam info


16v 4AGE heads specifications -
- Valve included angle (angle between the inlet and exhaust valves) - 45°
- Minimum valve spring seat pressure to allow for 7,700rpm - 35lbs, or 16kgs
- Inlet valve diameter - 29.5mm
- Exhaust valve diameter - 25.5mm
- Both valves have 6mm diameter stems.
- Cam bucket diameter 28mm, shim diameter 25mm

Cam Timings - (Japanese spec)	Inlet Cam	IVO  BTDC	IVC  ABDC	Duration	Lift (mm)
'Big port'		9°	51°	240°	7.56
'Small port'		8°	44°	232°	7.1
4AGZE		8°	44°	232°	7.1
	Exhaust Cam	EVO BBDC	EVC ATDC
'Big port'		51°	9 °	240°	7.56
'Small port'		44°	8°	232°	7.1
4AGZE		44°	8°	232°	7.1

20v 4AGE head specifications -
- Valve included angle (angle between the inlet and exhaust valves) - 35° (I think ...)
- Inlet valve diameter - 26.5mm
- Exhaust valve diameter - 26mm
- Both valves have 5mm diameter stems
- Cam bucket diameter 23mm, with very small shims between the valve stem top & bucket 

Cam Timings - (AE101)	Inlet Cam	IVO  BTDC	IVC  ABDC	Duration	Lift (mm)
VVT <4400rpm & > ~7000rpm		0°	70°	250°	7.97
VVT >4400rpm		30°	40°
	Exhaust Cam	EVO BBDC	EVC  ATDC	250°
		54°	16°		7.6

Cam Timings - (AE111)	Inlet Cam	IVO  BTDC	IVC  ABDC	Duration	Lift (mm)
VVT <4400rpm & > ~7000rpm		5°	65°	250°	8.2
VVT >4400rpm		35°	35°
	Exhaust Cam	EVO BBDC	EVC  ATDC
		54°	16°	250°	7.6

Source:
http://www.billzilla.org/4agstock.htm

[BigMike]

Tech links:

CRAP load of Crank information: http://www.club4ag.com/faq_and_tech_pages/4A-GE%20Crankshaft%20-%20Detailed%20Specifications%20and%20Analysis.html

[Sirdeuce]

The flow rate of the USDM large port TViS AFM 4age is 210cc min. Billzilla's info covers the MAP type version. The 182cc injectors are tied into a single group fire, all are fired at the same time. Our engines use a batch fire setup, 2 injectors are fired at a time. The MAP type have a fuel pressure of 2.9 bar as where the AFM version are a little lower, 2.55 bar. That's close to a 14% difference in pressure. The firing of all injectors at one time requires a lower fuel rate, and less attention tio injetor pulse timing. Not sure if they have a constant pulse or a single pulse for the entire cycle though. The batch fire system fires 2 injectors at a time. Our little 4AGE's fire cyls.1 and 2 in one batch and 3 and 4 in the other. This is actually better for both power and emissions as the fuel has less time to condense on itself and the intake walls and valve backs. I think they use the higher pressure on the MAP system to compensate for condensation. Higher pressure = finer mist. Just my thoughts on that.A little info for tuning, if you decrease the fuel pressure from 2.9 to 2.55 on the 182cc injectors you get about 162cc flowrate, increase the 2.55 to 2.9 on the 210cc injectors you get about 235cc flowrate. For this reason the only advantages to using the green coded MAP injectors out oof the 130 horse small port, high comp engine is that you can remove the injector resistor as they are high impoedence injectors, and they are ball type with 2 spray holes that can be directed to the tops of the valves.