Product Detail

Piston for gasoline engine

No. Parte: #P1800-V3 075
Piston for engine with specifications and materials for aftermarket
VW L4 1.8L (1781cc) DOHC 20 Val. AGU, AJQ, APP, AQA, ARZ, AEB, AJL, ANB, APU, ARK, AJH, AWC, AWD, AYP, AQX, APH, AVC Turbo 1996-08, Beettle, Golf GTI, Jetta, Passat, Sharan, Audi A3, A4, A4 Quattro, TT, TT Quatro, S3, Seat Leon, Ibiza, Alhambra, Toledo
SKU: #P1800-V3 075
Share
Engine Piston
Description Value
Piston Outside Diameter (mm)81.725
Ring MaterialGray Iron
Top Compression Ring Thickness (in)0.0590551181102362
Second Compression Ring Thickness (in)0.0688976377952756
Oil Ring Thickness (in)0.078740157480315
Piston Pin Outside Diameter (in)0.78740157480315
Piston Pin Length (in)2.30314960629921
Piston Pin MaterialSteel
Piston Pin Incorporated BearingsNo
OversizedYes
Piston Head TypeCombustion Chamber
Assembly Lubricant IncludedNo
Piston MaterialAluminium Alloy
Piston Outside Diameter (in)3.21751968503937
Meets or Exceeds Original Equipment Manufacture SpecificationsYes
Grade TypeRegular
Skirt TypeComplete
Piston Pmm Outside Diameter (mm)20
Top Compression Rmmg Thickness (mm)1.5
Second Compression Rmmg Thickness (mm)1.75
PositionN/A
Cylinder Diameter (mm)81.75
Cylinder Diameter (in)3.21850393700787
Piston Pmm Length (mm)58.5
Compression Height (mm)32.45
Compression Height (in)1.27755905511811
Bowl Depth or Crown Height (mm)-1.50
Bowl Depth or Crown Height (in)-0.0590551181102362
Bowl Diameter (mm)70.6
Bowl Diameter (in)2.77952755905512
Piston Pin AssemblyFloating
Oil Rmmg Thickness (mm)2
Note0.75mm oversize




Also Fits

Year BRAND Model Submodel Engine (L)
1997 Audi A4 Base 1.8 L 1781 4 - DOHC 20
1997 Audi A4 Base 1.8 L 1781 4 AEB DOHC 20
1997 Audi A4 Quattro Base 1.8 L 1781 4 AEB DOHC 20
1998 Audi A3 Base 1.8 L 1781 4 - DOHC 20
1998 Audi A4 Avant 1.8 L 1781 4 AEB DOHC 20
1998 Audi A4 Base 1.8 L 1781 4 AEB DOHC 20
1998 Audi A4 Quattro Base 1.8 L 1781 4 AEB DOHC 20
1998 Volkswagen Passat GLS 1.8 L 1781 4 AEB DOHC 20
1999 Audi A3 Base 1.8 L 1781 4 - DOHC 20
1999 Audi A4 Avant 1.8 L 1781 4 AEB DOHC 20
1999 Audi A4 Base 1.8 L 1781 4 AEB DOHC 20
1999 Audi A4 Quattro Avant 1.8 L 1781 4 AEB DOHC 20
1999 Audi A4 Quattro Base 1.8 L 1781 4 AEB DOHC 20
1999 Audi TT Base 1.8 L 1781 4 - DOHC 20
1999 Volkswagen Beetle GL 1.8 L 1781 4 APH DOHC 20
1999 Volkswagen Beetle GLS 1.8 L 1781 4 APH DOHC 20
1999 Volkswagen Beetle GLX 1.8 L 1781 4 APH DOHC 20
1999 Volkswagen Jetta GLS VR6 1.8 L 1781 4 - DOHC 20
1999 Volkswagen Jetta GLX VR6 1.8 L 1781 4 - DOHC 20
1999 Volkswagen Jetta VR6 Carat 1.8 L 1781 4 - DOHC 20
1999 Volkswagen Passat 1.8T 1.8 L 1781 4 AEB DOHC 20
1999 Volkswagen Passat GLS 1.8 L 1781 4 AEB DOHC 20
2000 Audi A3 Ambition 1.8 L 1781 4 - DOHC 20
2000 Audi A3 Attraction 1.8 L 1781 4 - DOHC 20
2000 Audi A4 Avant 1.8 L 1781 4 ATW DOHC 20
2000 Audi A4 Base 1.8 L 1781 4 ATW DOHC 20
2000 Audi A4 Quattro Avant 1.8 L 1781 4 ATW DOHC 20
2000 Audi A4 Quattro Base 1.8 L 1781 4 AEB DOHC 20
2000 Audi A4 Quattro Base 1.8 L 1781 4 ATW DOHC 20
2000 Audi S3 Base 1.8 L 1781 4 - DOHC 20
2000 Audi TT Base 1.8 L 1781 4 ATC DOHC 20
2000 Audi TT Quattro Base 1.8 L 1781 4 AMU DOHC 20
2000 Audi TT Quattro Base 1.8 L 1781 4 ATC DOHC 20
2000 Volkswagen Beetle GL 1.8 L 1781 4 APH DOHC 20
2000 Volkswagen Beetle GLS 1.8 L 1781 4 APH DOHC 20
2000 Volkswagen Beetle GLS Turbo 1.8 L 1781 4 APH DOHC 20
2000 Volkswagen Beetle GLX 1.8 L 1781 4 APH DOHC 20
2000 Volkswagen Beetle GLX Turbo 1.8 L 1781 4 APH DOHC 20
2000 Volkswagen Golf GLS 1.8 L 1781 4 AWD DOHC 20
2000 Volkswagen Golf GTI GLS 1.8 L 1781 4 AWD DOHC 20
2000 Volkswagen Jetta GLS 1.8 L 1781 4 AWD DOHC 20
2000 Volkswagen Jetta GLS Turbo 1.8 L 1781 4 AWD DOHC 20
2000 Volkswagen Passat 1.8T 1.8 L 1781 4 ATW DOHC 20
2000 Volkswagen Passat GLS 1.8 L 1781 4 ATW DOHC 20
2000 Volkswagen Passat GLS 1.8 L 1781 4 AUG DOHC 20
2001 Audi A3 Ambiente 1.8 L 1781 4 - DOHC 20
2001 Audi A3 Ambition 1.8 L 1781 4 - DOHC 20
2001 Audi A3 Attraction 1.8 L 1781 4 - DOHC 20
2001 Audi A4 Avant Confort 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Avant Luxury 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Base 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Basico 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Confort 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Luxury 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Sport 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Quattro Avant 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Quattro Base 1.8 L 1781 4 AWM DOHC 20
2001 Audi A4 Quattro Confort 1.8 L 1781 4 AWM DOHC 20
2001 Audi S3 Base 1.8 L 1781 4 - DOHC 20
2001 Audi TT Base 1.8 L 1781 4 ATC DOHC 20
2001 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2001 Audi TT Quattro Base 1.8 L 1781 4 AMU DOHC 20
2001 Audi TT Quattro Base 1.8 L 1781 4 AWP DOHC 20
2001 Seat Leon Sport 1.8 L 1781 4 - DOHC 20
2001 Seat Toledo Signo 1.8 L 1781 4 - DOHC 20
2001 Volkswagen Beetle GL 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle GL 1.8 L 1781 4 AWV DOHC 20
2001 Volkswagen Beetle GLS 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle GLS 1.8 L 1781 4 AWV DOHC 20
2001 Volkswagen Beetle GLS Turbo 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle GLX 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle GLX 1.8 L 1781 4 AWV DOHC 20
2001 Volkswagen Beetle GLX Sport Turbo 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle GLX Turbo 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle Sport 1.8 L 1781 4 APH DOHC 20
2001 Volkswagen Beetle Sport 1.8 L 1781 4 AWV DOHC 20
2001 Volkswagen Golf GLS 1.8 L 1781 4 AWD DOHC 20
2001 Volkswagen Golf GLS 1.8 L 1781 4 AWW DOHC 20
2001 Volkswagen Golf GTI GLS 1.8 L 1781 4 AWD DOHC 20
2001 Volkswagen Golf GTI GLS 1.8 L 1781 4 AWW DOHC 20
2001 Volkswagen Golf GTI Turbo 1.8 L 1781 4 AWD DOHC 20
2001 Volkswagen Jetta GLS 1.8 L 1781 4 AWD DOHC 20
2001 Volkswagen Jetta GLS 1.8 L 1781 4 AWW DOHC 20
2001 Volkswagen Jetta GLS Turbo 1.8 L 1781 4 AWD DOHC 20
2001 Volkswagen Jetta Wolfsburg Edition 1.8 L 1781 4 AWW DOHC 20
2001 Volkswagen Passat 1.8T 1.8 L 1781 4 AWM DOHC 20
2001 Volkswagen Passat GLS 1.8 L 1781 4 AUG DOHC 20
2001 Volkswagen Passat GLS 1.8 L 1781 4 AWM DOHC 20
2002 Audi A3 Advance 1.8 L 1781 4 - DOHC 20
2002 Audi A3 Ambiente 1.8 L 1781 4 - DOHC 20
2002 Audi A3 Attraction 1.8 L 1781 4 - DOHC 20
2002 Audi A4 Base 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Confort 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Luxury 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Quattro Avant 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Quattro Base 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Quattro Le Mans 1.8 L 1781 4 AMB DOHC 20
2002 Audi A4 Quattro Luxury 1.8 L 1781 4 AMB DOHC 20
2002 Audi S3 Base 1.8 L 1781 4 - DOHC 20
2002 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2002 Audi TT Quattro ALMS Edition 1.8 L 1781 4 AMU DOHC 20
2002 Audi TT Quattro Base 1.8 L 1781 4 AMU DOHC 20
2002 Audi TT Quattro Base 1.8 L 1781 4 AWP DOHC 20
2002 Seat Leon Sport 1.8 L 1781 4 - DOHC 20
2002 Seat Toledo Sport 1.8 L 1781 4 - DOHC 20
2002 Volkswagen Beetle GL 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle GLS 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle GLS Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle GLX 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle GLX Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle Sport 1.8 L 1781 4 AWV DOHC 20
2002 Volkswagen Beetle Turbo S 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Golf GTI 1.8T 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Golf GTI 337 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Golf GTI Turbo 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Jetta GLS 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Jetta Sportline 1.8 L 1781 4 AWP DOHC 20
2002 Volkswagen Passat 1.8T 1.8 L 1781 4 AWM DOHC 20
2002 Volkswagen Passat GLS 1.8 L 1781 4 AWM DOHC 20
2002 Volkswagen Sharan Base 1.8 L 1781 4 - DOHC 20
2003 Audi A3 Advance 1.8 L 1781 4 - DOHC 20
2003 Audi A3 Ambiente 1.8 L 1781 4 - DOHC 20
2003 Audi A3 Attraction 1.8 L 1781 4 - DOHC 20
2003 Audi A4 Base 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Cabrio 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Cabriolet 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Confort 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Luxury 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Vangard 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Quattro Avant 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Quattro Base 1.8 L 1781 4 AMB DOHC 20
2003 Audi A4 Quattro Luxury 1.8 L 1781 4 AMB DOHC 20
2003 Audi S3 Base 1.8 L 1781 4 - DOHC 20
2003 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2003 Audi TT Quattro Base 1.8 L 1781 4 BEA DOHC 20
2003 Audi TT Quattro S Line 1.8 L 1781 4 BEA DOHC 20
2003 Seat Alhambra Stella 1.8 L 1781 4 - DOHC 20
2003 Seat Leon Cupra R 1.8 L 1781 4 - DOHC 20
2003 Seat Leon Sport 1.8 L 1781 4 - DOHC 20
2003 Seat Toledo Sport 1.8 L 1781 4 - DOHC 20
2003 Volkswagen Beetle GL 1.8 L 1781 4 AWV DOHC 20
2003 Volkswagen Beetle GLS 1.8 L 1781 4 AWV DOHC 20
2003 Volkswagen Beetle GLS Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2003 Volkswagen Beetle GLX 1.8 L 1781 4 AWV DOHC 20
2003 Volkswagen Beetle GLX Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2003 Volkswagen Beetle Turbo S 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Golf GTI 1.8T 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Golf GTI 20th Anniversary 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Golf GTI Turbo 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Jetta GL 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Jetta GLS 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Jetta Sportline 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Jetta Wolfsburg Edition 1.8 L 1781 4 AWP DOHC 20
2003 Volkswagen Passat 1.8T 1.8 L 1781 4 AWM DOHC 20
2003 Volkswagen Passat GL 1.8 L 1781 4 AWM DOHC 20
2003 Volkswagen Passat GLS 1.8 L 1781 4 AWM DOHC 20
2003 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20
2004 Audi A3 Advance 1.8 L 1781 4 - DOHC 20
2004 Audi A4 Avant 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Base 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Cabrio 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Cabriolet 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Confort 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Luxury 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 S Line 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Vangard 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Quattro Avant 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Quattro Base 1.8 L 1781 4 AMB DOHC 20
2004 Audi A4 Quattro Luxury 1.8 L 1781 4 AMB DOHC 20
2004 Audi S3 Base 1.8 L 1781 4 - DOHC 20
2004 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2004 Audi TT Quattro Base 1.8 L 1781 4 BEA DOHC 20
2004 Audi TT Quattro S Line 1.8 L 1781 4 BEA DOHC 20
2004 Seat Alhambra Stella 1.8 L 1781 4 - DOHC 20
2004 Seat Leon Cupra R 1.8 L 1781 4 - DOHC 20
2004 Seat Leon Sport 1.8 L 1781 4 - DOHC 20
2004 Seat Toledo Sport 1.8 L 1781 4 - DOHC 20
2004 Volkswagen Beetle GLS 1.8 L 1781 4 AWV DOHC 20
2004 Volkswagen Beetle GLS Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2004 Volkswagen Beetle GLX 1.8 L 1781 4 AWV DOHC 20
2004 Volkswagen Beetle GLX Sport Turbo 1.8 L 1781 4 AWV DOHC 20
2004 Volkswagen Beetle Turbo S 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Golf GTI 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Golf GTI 1.8T 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Jetta GL 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Jetta GLI 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Jetta GLI 50 Aniversario 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Jetta GLS 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Jetta Sportline 1.8 L 1781 4 AWP DOHC 20
2004 Volkswagen Passat 1.8T 1.8 L 1781 4 AWM DOHC 20
2004 Volkswagen Passat GL 1.8 L 1781 4 AWM DOHC 20
2004 Volkswagen Passat GLS 1.8 L 1781 4 AWM DOHC 20
2004 Volkswagen Passat GLS 4 Motion 1.8 L 1781 4 AWM DOHC 20
2004 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20
2005 Audi A4 Avant 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Base 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Cabrio 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Cabriolet 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Luxury 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 S Line Sport 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Trendy 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Vangard 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Quattro Avant 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Quattro Base 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Quattro Elite 1.8 L 1781 4 AMB DOHC 20
2005 Audi A4 Quattro Luxury 1.8 L 1781 4 AMB DOHC 20
2005 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2005 Audi TT Sport 1.8 L 1781 4 AWP DOHC 20
2005 Audi TT Quattro Base 1.8 L 1781 4 BEA DOHC 20
2005 Audi TT Quattro S Line 1.8 L 1781 4 BEA DOHC 20
2005 Seat Alhambra Reference 1.8 L 1781 4 - DOHC 20
2005 Seat Ibiza Cupra 1.8 L 1781 4 - DOHC 20
2005 Seat Ibiza FR 1.8 L 1781 4 - DOHC 20
2005 Seat Leon Cupra R 1.8 L 1781 4 - DOHC 20
2005 Seat Leon FR 1.8 L 1781 4 - DOHC 20
2005 Volkswagen Beetle GLS 1.8 L 1781 4 BKF DOHC 20
2005 Volkswagen Beetle GLS Sport Turbo 1.8 L 1781 4 BKF DOHC 20
2005 Volkswagen Beetle GLX Sport Turbo 1.8 L 1781 4 BKF DOHC 20
2005 Volkswagen Beetle Turbo S 1.8 L 1781 4 BKF DOHC 20
2005 Volkswagen Golf GTI 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Golf GTI 1.8T 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Jetta GL 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Jetta GLI 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Jetta GLS 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Jetta Sportline 1.8 L 1781 4 AWP DOHC 20
2005 Volkswagen Passat 1.8T 1.8 L 1781 4 AWM DOHC 20
2005 Volkswagen Passat GL 1.8 L 1781 4 AWM DOHC 20
2005 Volkswagen Passat GLS 1.8 L 1781 4 AWM DOHC 20
2005 Volkswagen Passat GLS 4 Motion 1.8 L 1781 4 AWM DOHC 20
2005 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20
2006 Audi A4 Cabrio 1.8 L 1781 4 AMB DOHC 20
2006 Audi A4 Cabriolet 1.8 L 1781 4 AMB DOHC 20
2006 Audi A4 Luxury 1.8 L 1781 4 AMB DOHC 20
2006 Audi A4 Trendy 1.8 L 1781 4 AMB DOHC 20
2006 Audi TT Base 1.8 L 1781 4 AWP DOHC 20
2006 Audi TT Sport 1.8 L 1781 4 AWP DOHC 20
2006 Audi TT Quattro Base 1.8 L 1781 4 BEA DOHC 20
2006 Audi TT Quattro S Line 1.8 L 1781 4 BEA DOHC 20
2006 Seat Alhambra Reference 1.8 L 1781 4 - DOHC 20
2006 Seat Ibiza Cupra 1.8 L 1781 4 - DOHC 20
2006 Seat Ibiza FR 1.8 L 1781 4 - DOHC 20
2006 Seat Leon Cupra R 1.8 L 1781 4 - DOHC 20
2006 Seat Leon FR 1.8 L 1781 4 - DOHC 20
2006 Seat Leon FR Last Edition 1.8 L 1781 4 - DOHC 20
2006 Seat Leon Stylance 1.8 L 1781 4 - DOHC 20
2006 Volkswagen Golf GTI 1.8T 1.8 L 1781 4 AWP DOHC 20
2006 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20
2007 Audi A4 Luxury 1.8 L 1781 4 - DOHC 20
2007 Seat Alhambra Reference 1.8 L 1781 4 - DOHC 20
2007 Seat Ibiza FR 1.8 L 1781 4 - DOHC 20
2007 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20
2008 Audi A4 Luxury 1.8 L 1781 4 - DOHC 20
2008 Audi A4 Trendy Plus 1.8 L 1781 4 - DOHC 20
2008 Seat Ibiza Cupra 1.8 L 1781 4 - DOHC 20
2008 Seat Ibiza FR 1.8 L 1781 4 - DOHC 20
2008 Volkswagen Sharan Comfortline 1.8 L 1781 4 - DOHC 20