Im trying to compile the specs of the g13 and g16 engines in case we need to find parts to make them easier to rebuild or modify.
Please post up any info you can muster copy and paste with this layout to update.... Most are fom my measurements done to the suzi, dai & hon engines quite fidly work. Please re-check from a reputable manual this is just simple reference for getting ideas about improving performance and general information.
G13/16 - 84mm bore spacings
deck height (block height)--------------
Suzuki G16 = 213.8mm
Head gasket height=1.2mm
Deck Clearane below= 0.9mm
Suzuki G13 = 187mm
Honda D16 = 212mm
Daihatsu HD = 210mm
Daihatsu HC = 200mm
Daihatsu HD-E = 212mm
Main journal diameters---------------
G16a/b = 52mm
rod BE bore 1.851 inches / 47.0154 mm
Daihatsu HD-E = 50mm
Honda d16 = 55mm
Crankpin diameters-------------------
Suzuki G16a/b = 44mm
Daihatsu sohc 16v = 45mm
HOnda D16 = 45mm
Crank weights ----8 counterweights = 12.1kg(26.7lbs) 4 counterweight = 20lbs
P/Pin Dia. = 0.7480 (same as nissan e15et rods)
Bore spacing g16b = 84mm
Length of Main bearings = 18mm
Rod Lengths --------------------------
G16= 139.4968 mm / 5.492 inches (396 - 404 grams)
G16 BE width = .864 inches / 21.9456 mmme15e or et = 140.08mm / 5.537 inches
Valve sizes ---------------------------
G13/16-a/b/bb SOHC 16v all same
G16 16v
inlet = 30.1mm X 5.5 X 92.3 1R
G13b 16v
inlet = 29.1mm X 5.5 X 92.3 1R Smaller!!!!
exhaust = 24.9mm (all 16v sohc or dohc)
Inlet sizes same as Honda d16 sohc 16v/ Daihatsu HD sohc 16v
G13/G16 exhaust valve specs
exhaust - 24.9 X 5.5 79.9 1R
Honda and Daihatsu are larger 26 mm (1mm larger than G series!)
capacities------------------------------------------------------------------
G13B and BB
1298cc - 74mm bore x 75.5mm stroke
G13A?
1324cc - 74mm bore x 77mm stroke
G15
1493cc - 75mm bore x 84.5mm stroke?
g16a/b
1590cc - 75mm bore and 90mm stroke
Crank-----------------------------------------------------------------------X
Stroke
G13B - 75.5 and 77mm (forged and cast respectively)
G13bb - (cast with solid journals - very strong compared to hollow)
G16B - 90mm (cast with hollow journals)
G15 - 84.5mm? (cast with hollow journals)
OVERBORES stock sleeves? (piston weight standard 75mm = 207 grams)
1mm g16 = 1633cc
2mm g16 = 1676cc
reminder stock sleeves are dangerous at these oversizes
custom full sleeves are recommended for following sizes....
2.5mm g16 = 1698cc
3mm g16 = 1720cc
3.5mm g16 = 1742cc
4mm g16 = 1765cc
4.5mm / 5mm (possible?) g16 = 1787cc / 1810cc
Pistons-----------------------------------------------------------------------X
Gudgeon pins
All 19mm ?
Piston Pin heights-----------------------------------------------------------
G13b 29.1 mm
G15 ??mm
G16b 28.5 mm
OEM vitara 75mm std pistons: 12100-71820-0A0
OEM vitara 75mm std rings: 12140-60A50
OEM vitara head gasket: 11141-71C00
Compression ratios---------------------------------------------------------X
1986-1989 Carbureted Samurais - 1324cc
Compression Ratio 8.9:1
1990-1995 EFI Samurais - 1298cc
Compression Ratio 9.5:1
1995 - 1997 Geo Metro with 1.3L - 1298cc
Compression Ratio 9.5:1
Custom pistons from other sources for big bores------------------------X
GSXR1100 pistons? 76mm bores 25.5mm pin height?
CBR1000RR pistons? 75mm bores 27mm pin height?
Wiseco piston 1983 Honda xr250 matched with xg rings.(very thin rings)
Piston skirt requires about 7mm to be removed.
Piston crown has to be flycut for valve clearance.
Conrods---------------------------------------------------------------------X
Other rods that could be used toyota 4age (with unique simple oil squirters!!!)

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Engine weights-------------------------------------------------------------X
G16b = Total 131.75 lbs 60kgs!!!!!
reference:
http://www.teamswift.net/viewtopic.php?p=211625#211625G13B crank has a 75.5mm stroke, 45mm mains, and 42mm rod journals?
update: g16a/b block height 215mm
measured from crank centre to deck
79mm bores have been achieved, therefore I would suggest a destroked honda d16 crank with 40mm crankpins to suit nissan e15 rods and dished pistons with 8.5 to 9 comp for boost. 1745cc with the g16 16v head should theoretically make 400hp. This is after seeing that a nissan e15et make over 400hp with 8v heads and 76mm bores.
other links to info
http://pirate4x4.com/forum/showthread.php?t=639274&highlight=cylinder+heads+factsHonda crank dimensions and weights in lbs
1488cc---------
1.5 84-87 D15A1 Rod journal size 1.653", main journal size 1.771". Neck diameter is .865" 23lbs
1493cc-----------
1.5 88-95 D15B1-8 D15Z 88-95 Civic, 88-91 CRX, 92-95 del SOL & V-TEC.
Rod journal diameter 1.653", main journal diameter 1.771". Neck diameter is .944". 28lbs
1.5 88-95 D15B1-8 D15Z 88-95 Civic, 88-91 CRX, 92-95 del SOL & V-TEC.
Rod journal diameter 1.653", main journal diameter 1.771". Neck diameter is .865". 28lbs
1.5 1990 D15B1 Rod journal diameter 1.496", main journal dia 1.771". Neck diameter is .944" 25lbs
1.5 92-95 D15Z Rod journal diameter 1.771", main journal diameter 1.968" 36lbs
1590cc-----------
1.6 88-95 D16A6, D16Z6 88-91 Civic Si & CRX Si, 92-95 Civic & del SOL Si.
Rod journal diameter 1.771", main journal diameter 2.165". Neck diameter is .865". 32lbs
1.6 88-00 D16A6, D16Z6, D16Y5, D16Y7, D16Y8
1.6 88-91 Civic Si & CRX Si, 92-95 Civic & del SOL Si, 96-00 Civic, del SOL S, Civic EX V-TEC, del SOL Si, Civic HX.
Rod journal diameter 1.771", main journal diameter 2.165". Neck diameter is .944" 32lbs
So only D16 cranks can be used on the G16a/b engines unless you weld some mains up big job
Pistons from Honda
D15B1/ 2/ 7/ 8 - COMP HEIGHT: 1.208” - DOME HEIGHT: .000”
D16Z6 - COMP HEIGHT: 1.181” - DOME HEIGHT: -.118”
D15Z1 - COMP HEIGHT: 1.092” - DOME HEIGHT: -.277”
D16Y7 - COMP HEIGHT: 1.181” - DOME HEIGHT: -.130”
D16Y5 - COMP HEIGHT: 1.161” - DOME HEIGHT: -.106”
D16Y8 - COMP HEIGHT: 1.161” - DOME HEIGHT: -.083”
D17A1 - COMP HEIGHT: 1.062” - DOME HEIGHT: -.106”
D17A2 - COMP HEIGHT: 1.062” - DOME HEIGHT: -.104”
ROD TECH:
ROD/STROKE RATIO AND ROD LENGTH:
D17A1: /140MM
D17A2: /140MM
D16Y8: 1.52/137MM
D16Y7: 1.52/137MM
D16Z6: 1.52/137MM
D16A1: 1.52/137MM
D16A6: 1.52/137MM
D15B1: 1.59/134MM
D15B2: 1.59/134MM
D15B7: 1.59/134MM
D15B8: 1.59/134MM
ZC: 1.52/137MM
1.3 G13BA
Bore x Stroke 74mm x 75.5mm
Compression Ratio 9.5:1
Cylinder Block Deck Height 186.8mm
Deck Clearance 0.2mm (above)
Cylinder Head Volume 32.2cc
Head Gasket Thickness (compressed) 1.2mm
Minimum Combustion Chamber Volume 38.2cc
Intake Valve O.D. 36mm
Exhaust Valve O.D. 30mm
Connecting Rod Length (between centers) 120mm
Piston Comp Height 28.90mm
Piston Clearance & Position (from Crown) 0.200 @ 45.80
1.6 G16A
Bore x Stroke 75mm x 90mm
Compression Ratio 8.9:1
Cylinder Block Deck Height 213.8mm
Deck Clearance 0.9mm (below)
Cylinder Head Volume 32.2cc
Head Gasket Thickness (compressed) 1.2mm
Minimum Combustion Chamber Volume 50.6cc
Intake Valve O.D. 36.6mm
Exhaust Valve O.D. 32.5mm
Connecting Rod Length (between centers) 139.6mm
Piston Comp Height 28.10mm
Piston Clearance & Position (from Crown) 0.200 @ 48.00
1.6 G16B
Bore x Stroke 75mm x 90mm
Compression Ratio 9.5:1
Cylinder Block Deck Height 213.8mm
Deck Clearance 0.9mm (below)
Cylinder Head Volume 25.5cc
Head Gasket Thickness (compressed) 1.2mm
Minimum Combustion Chamber Volume 46.8cc
Intake Valve O.D. 29.2mm
Exhaust Valve O.D. 25.0mm
Connecting Rod Length (between centers) 139.6mm
Piston Comp Height 28.55mm
Piston Clearance & Position (from Crown) 0.300 @ 53.00