3gWorld - 3rd Generation Preludes only...

3rd Generation specifications

This is a list of technical specifications. You will find bore/stroke numbers, cam info, and other important facts on the 3rd generation engines. If you need basic information go to HondaPrelude.com for those.

Engine tune up specs.

Year	Engine	Spark Plug Gap	Ignition Timing (manual)	Ignition Timing (auto)	Fuel Pump (psi)	Idle Speed (manual)	Idle Speed (auto)	Intake Clearance (In.)	Exhaust Clearance (in.)
1988	A20A1	0.039- 0.043	24B	15B	3.0	800- 850	700- 800	0.005 - 0.007	0.010 - 0.012
	A20A3	0.039- 0.043	15B	15B	35	750- 800	750- 800	0.005 - 0.007	0.010 - 0.012
	B20A3	0.039- 0.043	20B	12B	2.5	800- 850	750- 800	0.005 - 0.007	0.010 - 0.012
	B20A5	0.039- 0.043	15B	15B	35	750- 800	750- 800	0.003 - 0.005	0.006 - 0.008
1989	A20A1	0.039- 0.043	24B	15B	2.6 - 3.3	750- 850	680- 790	0.003- 0.005	0.010- 0.012
	A20A3	0.039- 0.043	15B	15B	33 - 39	700- 800	700- 800	0.005- 0.007	0.010 0.012
	B20A3	0.039- 0.043	20B	12B	2.5	800- 850	750- 800	0.005- 0.007	0.010- 0.012
	B20A5	0.039- 0.043	20B	15B	1.3 - 2.1	750- 850	700- 800	0.003- 0.005	0.006- 0.008
1990	F22A1	0.039- 0.043	15B	15B	36	650- 750	650- 750	0.009- 0.011	0.011- 0.013
	F22A4	0.039- 0.043	15B	15B	36	650- 750	650- 750	0.009- 0.011	0.011- 0.013
	B20A3	0.039- 0.043	20B	15B	36	750- 850	700- 800	0.005- 0.007	0.010- 0.012
	B20A5	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.003- 0.005	0.006- 0.008
	B21A1	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.003- 0.005	0.006- 0.008
1991	F22A1	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.009- 0.011	0.011- 0.013
	F22A4	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.009- 0.011	0.011- 0.013
	F22A6	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.009- 0.011	0.011- 0.013
	B20A5	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.003- 0.005	0.006- 0.008
	B21A1	0.039- 0.043	15B	15B	36	700- 800	700- 800	0.003- 0.005	0.006- 0.008

Torque Specs.
All numbers are in ft. lbs.
See note below for * and ++

Year Engine Cylinder Head Main Bearing Rod Bearing Crankshaft Damper Flywheel Manual Intake Manifold Exhaust Manifold

1988 A20A1 49 48 23 83 76* 16 23

A20A3 49 48 23 83 76* 16 23

B20A3 49 48 23 83++ 76* 16 23

B20A5 49 48 23 83++ 76* 16 23

1989 A20A1 49 48 23 108 76 16 23

A20A3 49 48 23 108 76 16 23

B20A3 49 48 23 83++ 76 16 23

B20A5 49 48 23 83++ 76 16 23

1990 F22A1 78 52 34 166 76 16 23

F22A4 78 52 34 166 76 16 23

B20A3 49 48 23 83 76 16 23

B20A5 49 48 23 83 76 16 23

B21A1 49 48 23 108 76 16 23

1991 F22A1 78 52 34 159 76 16 23

F22A4 78 52 34 159 76 16 23

F22A6 78 52 34 159 76 16 23

B20A5 49 48 23 108 76 16 23

B21A1 49 48 23 108 76 16 23

*Flywheel for automatic transaxle is 54lbs.
++Fuel injection 108
Spark plugs are torqued to 13lbs. on all models.
Lug nuts are torqued to 80lbs (stock wheel) on all models

Engine Specs.

Engine Class	Displacement Liter (cc)	Fuel System	Net HP @ RPM	Net Torque @ RPM	Bore x Stroke	Comp. Ratio
A20A1	2.0 (1955)	2 bbl	98@5500	109@3500	3.25 x 3.58	9.0:1
A20A3	2.0 (1955)	EFI	110@4500	114@4500	3.25 x 3.59	9.3:1
B20A3	2.0 (1955)	Dual Sidedraft	100@5500	107@4000	3.19 x 3.74	9.1:1
B20A5	2.0 (1955)	MPFI	135@5500	127@4500	3.18 x 3.74	9.0:1
B21A1	2.1 (2056)	MPFI	140@5800	135@5000	3.27 x 3.74	9.4:1
F22A1	2.2 (2156)	MPFI	125@5200	137@4000	3.35 x 3.74	8.8:1
F22A4	2.2 (2156)	MPFI	130@5200	142@4000	3.35 x 3.74	8.8:1
F22A6	2.2 (2156)	MPFI	140@5600	142@4500	3.35 x 3.74	8.8:1