Hi to all.

I need to know the characteristics of the A14 oval port " head h72".

I need to know the pistons diameter and course, and the compression ratio.

how mutch i could lower the head?

thanks
americo

Try the search bar.

i have tryed.

Have you tried the tech section?
Pete

defanetly try the tec section i was in there last night and it has all the info you asked for plus plenty more

Found some specs finally.
Datsun A14 Engine

Bore: 76mm
Stroke: 77mm
Conrod: 133mm
Block Hieght: 204.1mm
Displacement: 1397cc
Power: approx 78hp

but i didnt find the compression!!!

what is the conrod?

its the connecting rod

Ahh my kind of thread tonight!

ENGINE ASSEMBLY
Type . . . . . . . . . . . . . . . . . . . . . . ., . ........ 4 cyl OHV
Model types . . . . . . . . . . . . . . . . . . . . . . . A12-A14-A15
Capacity:
A12 engine . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 71 cc
A14engine . . . . . . . . . . . . . . . . . . . . . . . . . . . 1397 cc
A15 engine . . . . . . . . . . . . . . . . . . . . . . . . . . .1 488 cc
Bore:
A12engine ............................ 73 mm
A14, A1 5 engine . . . . . . . . . . . . . . . . . . . . . . . 76 mm
Stroke:
A1 2 engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70 mm
A14 engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77 mm
A15 engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82 mm
Firing order .............................1 -3-4-2
Compression ratio ........................... 9.0: 1
NOTE: See Engine Tune-up section for engine
tuning Specifications.
CYLINDER HEAD
Type . . . . . . . . . . . . . . . . . . . .O ne piece aluminium alloy
Cylinder head warp limit ................... 0.1 mm
Valve seat type . . . . . . . . . . . . . . . . . . . Replaceable insert
Valve seat width:
A 12 engine-
Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 mm
Exhaust . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 .9 mm
A14, A15 engine-
Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 mm
Exhaust.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 mm
Valve seat angle . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 deg
Valve guide type . . . . . . . . . . . . . . . . . . . . . . . Replaceable
Valve guide oversize ....................... 0.2 mm
VALVES AND SPRINGS
Valve stem diameter:
. Inlet ......................... 7.960-7.975 mm
Exhaust . . . . . . . . . . . . . . . . . . . . . . 7.945-7.960 mm
Valve stem clearance limit . . . . . . . . . . . . . . . . . 0.10 mm
Valve length minimum . . . . . . . . . . . . . 103.6-104.0 mm
Valve clearance (hot) . . . . . . . . . . . . . . . . . . . . . 0.35 mm
.Valve clearance (cold) . . . . . . . . . . . . . . . . . . . .. 0.25 rnm
Valve spring free length . . . . . . . . . . . . . . . . . . . 46.5 mm

CYLINDER BLOCK
Bore diameter:
A1 2 engine . . . . . . . . . . . . . . . . . 73.000-73.050 mm
A14, A15 engine . . . . . . . . . . . . .76.000-76.050 mm
Maximum out of round ........ .' . . . . . . . . . . . 0.2 mm
Maximum taper ........................... 0.2 mm
Bore measuring points . . . . . . . . . . . . . . . . . . . . . See text
Face warpage limit . . . . . . . . . . . . . . . . . . . . . . .0 .05 mm
CRANKSHAFT AND MAIN BEARINGS
Number of main bearings ........................5
End thrust taken at ............... No 3 main bearing
End thrust clearance .................0 .05-0.30 mm
Main bearing journal diameter .... 49.951-49.964 mm
Main bearing journal under-sizes . . 0.25,0.50,0.75 mm
Main bearing journal taper limit . . . . . . . . . . . . 0.03 mm
Main bearing journal out of round limit ...... 0.03 mm
Main bearing to journal clearance .... 0.026-0.100 mm
Crankpin diameter ..................4 4.961 -44.974
Crankpin undersizes ........ 0.08,0.25,0.50,0.75 mm
Crankpin taper limit . . . . . . . . . . . . . . . . . . . . .. 0.03 mm
Crankpin out of round limit . . . . . . . . . . . . . . . . 0.03 mm
Bearing type ............... Replaceable steel backed
Connecting rod end float . . . . . . . . . . . . . . .0 .1-0.4 mm
Crankpin to bearing clearance ....... 0.030-0.100 mm
Bearing undersizes ......... 0.08,0.25,0.50,0.75 mm
PISTONS AND RINGS
Material . . . . . . . . . . . . . . . . . . . . . Cast aluminium alloy
Piston diameter:
A12 engine ................. 72.987-73.037 mm
A1 4, A 15 engine . . . . . . . . . . . . .7 5.967-76.01 7 mm
Oversizes available . . . . . . . . . . . . . . . . . .0 .50-1.00 mm
Piston skirt to cylinder clearance .......0 .25-0.45 mm
Compression ring end gap:
A12,Al4engine.. . . . . . . . . . . . . . . .0 .20-0.35 mm
A15 engine .....................0 .15-0.30 mm
Oil control ring end gap ..............0 .30-0.90 mm
LUBRICATION
Type ................................ Full pressure
Oil pump type .............E ccentric rotor (trochoid)
Filter type . . . . . . . . . . . . . . . . . . . . . . . .; ...... Full flow
Maximum inner rotor tip to outer rotor tip clearance .........................0 .2 mm Maximum outer rotor to body clearance ...... .0.5 mm
Relief valve spring:
Free length ..........................4 3.49 mm
Fitted length . . . . . . . . . . . . . . . . . . . . . . . . .3 0.3 mm
Relief pressure . . . . . . . . . . . . . . . . . . . . . . .3 72-41 1 kPa
Oil pressure at idling . . . . . . . . . . . . . . . . . . . 90-1 17 kPa
TORQUE WRENCH SETTINGS
Cylinder head bolts . . . . . . . . . . . . . . . . . . . . . . . . . 74 Nm
Connecting rod nuts . . . . . . . . . . . . . . . . . . . . . . . . 37 Nm
Flywheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Nm
Main bearing cap bolts . . . . . . . . . . . . . . . . . . . . . . 59 Nm
Camshaft sprocket ......................... 47 Nm
Camshaft locating plate . . . . . . . . . . . . . . . . . . . . . . 8 Nm
Sump bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Nm
Oil strainer bolts ........................... 14 Nm
Crankshaft pulley bolt . . . . . . . . . . . . . . . . . . . . . 196 Nm
Timing chain cover bolts . . . . . . . . . . . . . . . . . . . . . 7 Nm
Rocker pedestal bolts . . . . . . . . . . . . . . . . . . . . . . . 25 Nm
Valve rocker adjusting nut . . . . . . . . . . . . . . . . . . . 22 Nm
Sumpplug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Nm

Hope that gets you started on specs, they're all in the workshop manual of your choice...Datsun Sunny B310 is what these specs are from

thanks man.

just great

You are most welcome!