EL 1.6L ENGINE: Difference between revisions

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The EK1 (or EK) 1.8l engine was manufactured by Honda Motor Company between 1979-1983 for the 1st generation Honda Accord, 1st generation Honda Prelude, 1st generation Honda Vigor and early 2nd generation Honda Accord models. Introduced new for the 1979 model year, it replaced the standard EF 1.6L in US Accords. It was a water cooled, SOHC 12-Valve CVCC engine with a displacement of 1.8L (1751CC). Output varied as the engine went through two updates during it's production. Most notably was the introduction of the CVCC-II emission setup in late 1980 models. The EK 1.8l engine was standard in Japanese and US Markets. All other markets worldwide had standard the EL 1.6L engine. Transmission choices were an automatic 2spd/3spd or manual 5 speed.  
The EL 1.6l engine was manufactured by Honda Motor Company between 1979-1983 for the 1st generation Honda Accord and 1st generation Honda Prelude. It is part of the E-series of Honda engines. Introduced new for the 1979 model year, it replaced the standard EF. It was a water cooled, SOHC 8-Valve CVCC engine with a displacement of 1.6L (1602CC). Output varied as the engine went through two updates during it's production. The EL 1.6l engine was standard in Canada, Europe and Australian Markets. Transmission choices were an automatic 2spd/3spd or manual 5 speed.  


Minor engine issues are known to occur, especially the cylinder head warping, causing a blown head gasket. The immense heat generated from the combined exhaust/intake setup could not exchange fast enough to the iron block, resulting in warpage. Honda tired to remedy this with an updated cylinder revision to help dissipate the heat, which lowered temps dramatically. Clogged CVCC valves and incorrect wear on the oil pump gear are also issues to look for.
'''The EL series is an interference engine!'''


[[File:EK1enginestock.jpg|750px|]]
There are three variations of this cylinder head, depending on the year Honda it was offered in.
 
Minor engine issues are known to occur, especially the cylinder head warping, causing a blown head gasket. The immense heat generated from the combined exhaust/intake setup could not exchange fast enough to the iron block, resulting in warpage. Honda tired to remedy this with an updated cylinder revision to help dissipate the heat, which lowered temps dramatically. 
 
[[File:ELenginestock.jpg|750px|]]


==Overview==
==Overview==


* Displacement 1.8 L (1,751 cc)
* Displacement 1.6 L (1,602 cc)
* Inline four cylinder, transverse
* Inline four cylinder, transverse
* 77mm bore x 94mm stroke (3.03 in × 3.70 in)
* Cast iron block & aluminum silicon alloy cylinder head
* Cast iron block & aluminum cylinder head
* Redline limit - 79-80 Models 5,800 RPM, 81-82 Models 6,000 RPM
* Redline limit - 6,000 RPM
* Two barrel Keihin Carburetor w/ manual choke
* Three barrel Keihin Carburetor w/ auto choke
* Electronic Ignition
* Electronic Ignition
* Belt driven timing gear
* Belt driven timing gear
Line 22: Line 25:
==Engine Block==
==Engine Block==


Cast iron block with integrated water pump insert and large oil passages. Essentially a stroked EL Block (casting is 99% identical).Three versions exist (689, PB2 PC1) with additional manufacturing refinements and accessory bolt holes. Blocks are identical for both manual and auto trans per there version.  
Cast iron block with integrated water pump insert and large oil passages. Three versions exist (689, PB2 PC1) with additional manufacturing refinements and accessory bolt holes. Blocks are identical for both manual and auto trans per there version. They essentially the same as the EK 1.8l blocks, but with minor changes.


===Specs===
===Specs===
* 77mm bore x 94mm stroke (3.03 in × 3.70 in)


===Versions===
* 77mm bore x 86mm stroke (3.031 in × 3.386 in)
*689 - #HMC-1 or HMC-3, Standard layout for 689 cylinder head (79-80 models)
*PB2 - #HMC-3,
*PC1 - #HMC-3, Block head surface changed. Oil cooler joint w/ drain bolt added underneath oil filter location (auto only). 12mm drain bolt w/ washer changed on front of block for additional coolant drain.


==1979 - 1980 CVCC Cylinder Head (689)==


Six port cylinder head (4 intake ports / 2 exhaust ports) for 1979 and 1980 models.
==(676-1) 1979 - 1980 Non-CVCC Cylinder Head==
* USDM EK1-1500001~ Prelude (1979 49 S)
* USDM EK1-1000001~ Prelude (1979 CALI)
* USDM EK1-1900001~ Prelude (1979 HI-AL)
* USDM EK1-2500001~ Prelude (1980 49 S)
* USDM EK1-2000001~ Prelude (1980 CALI Manual)
* USDM EK1-2300001~ Prelude (1980 CALI Auto)
* USDM EK1-2900001~ Prelude (1980 HI-AL)
* JDM EK-1000001~ & EK1200001~ Engines Prelude (SN100-110 Models)
*Note - 1980 California Automatic models used the newer PB2 cylinder head design only during this year for emission standards.
*Intake valve diameter (34mm), Exhaust valve diameter (28mm). Aux valve diameter (12mm).


[[File:79-80EK1CYLINDERHEADLAYOUT.jpg|750px|]]
Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1979-1980 models.
 
* CDM/EDM EL-1000001~ Prelude (1979)
* CDM/EDM EL-1200001~ Prelude (1980)
* CDM/EDM EL-1300001~ Prelude (1981)
 
[[File:79-80ELCYLINDERHEADLAYOUT.jpg|750px|]]


===Specs===
===Specs===
* 8:0:1 Compression
* 8:4:1 Compression
* 72 HP @ 4500 RPM  
* 73.5 HP @ 5000 RPM  
**68 HP @ 4500 RPM w/ Hondamatic '79 & '80 Models
* 90 ft lb Torque @ 3000 RPM  
* 94 ft lb Torque @ 3000 RPM  
* Redline @ 5800 RPM
**94 ft lb Torque @ 3500 RPM w/ Hondamatic '79 Model
* Intake valve diameter (34mm), Exhaust valve diameter (28mm).
**94 ft lb Torque @ 2500 RPM w/ Hondamatic '80 Model


===Engine Weight w/ Trans===
===Engine Weight w/ Trans===
* 5spd - 338.5lbs (153.5kg)
* 5spd -  
* Auto - 338.7lbs (153.6kg)
* Auto -  


===689 Cam Profile===
===676-1 Cam Profile===
Two camshaft profiles were used on the manual/auto for these years. NOTE - '80 CALI models used the PB2 Cam profile with newer engine.
Three camshaft profiles were used on the manual/auto for these years.  
*MANUAL TRANS CAM# 14110-689-000
**AUX IN CAM HEIGHT - 43.737 - 44.057MM
**MAIN IN CAM HEIGHT - 37.923 - 38.163MM
**MAIN EX CAM HEIGHT - 38.004 - 38.244MM


*AUTO TRANS CAM# 14110-689-900
*EL-1000001~ CAM# 14110-676-640
**AUX IN CAM HEIGHT - 43.737 - 44.057MM
*EL-1200001~ CAM# 14110-676-641
**MAIN IN CAM HEIGHT - 37.546 - 37.786MM
**AUX IN CAM HEIGHT -  
**MAIN EX CAM HEIGHT - 37.628 - 37.868MM
**MAIN IN CAM HEIGHT -  
**MAIN EX CAM HEIGHT -  


Japanese versions of the 689 used different profiles throughout the two years.
*EL-1300001~ 5SPD CAM# 14110-676-600
*79 Manual JDM# 14110-689-000
**AUX IN CAM HEIGHT -  
*79 Auto JDM# 14110-689-900
**MAIN IN CAM HEIGHT -  
*80 Manual JDM# 14110-689-010
**MAIN EX CAM HEIGHT -  
*80 Auto JDM# 14110-689-901
 
*EL-1300001~ HMT CAM# 14110-676-740
**AUX IN CAM HEIGHT -  
**MAIN IN CAM HEIGHT -  
**MAIN EX CAM HEIGHT -  


===Notes===
===Notes===
Brand new for 1979 Accord and Prelude models, it essentially was a beefier version of the previously used EF 1.6l cylinder head on a longer block.


==1981 CVCC-II Cylinder Head (PB2)==
==(676-2) 1981 Non-CVCC Cylinder Head==


Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1981 models.  
Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1981 models. Same as 676-1 but with 1mm larger intake valves (35mm).  
* USDM EK1-3500001~ Prelude (49 S)
* USDM EK1-3000001~ Prelude (CALI)
* USDM EK1-3900001~ Prelude (HI-AL)
* JDM EK-1300001~ Engines Prelude (SN200 Models)
*Introduction of the new CVCC-II emission system, catalytic converter and EGR valve. Intake valve diameter increased 1mm Dia (35mm), Exhaust valve diameter stayed the same (28mm). Aux valve diameter stayed the same (12mm). The original 2 port exhaust layout was changed to 4 ports to create a greater resistance with uneven heating. Increased compression was changed 8.8:1 with a slightly deeper dished piston dome. A slightly hotter spark plug was introduced due to the newer emission setup.  


[[File:81EK1CYLINDERHEADLAYOUT.jpg|750px|]]
* CDM/EDM EL-1300001~ Prelude (1981)
 
[[File:79-80ELCYLINDERHEADLAYOUT1.jpg|750px|]]
[[File:79-80ELCYLINDERHEADLAYOUT.jpg|750px|]]


===Specs===
===Specs===
* 8.8:1 Compression
* 8:4:1 Compression
* 75 HP @ 4500 RPM  
* 75 HP @ 5000 RPM  
** 68 HP @ 4500 RPM w/ Hondamatic
* 90 ft lb Torque @ 3500 RPM  
* 94 ft lb Torque @ 3500 RPM
* Redline @ 6000 RPM
* Intake valve diameter (35mm), Exhaust valve diameter (28mm).


===Engine Weight w/ Trans===
===Engine Weight w/ Trans===
* 5spd - 342.8lbs (155.5kg)
* 5spd -  
* Auto - 392.6lbs (169kg)
* Auto -  
 
===676-2 Cam Profile===
Three camshaft profiles were used on the manual/auto for these years.  
 
*EL-1300001~ 5SPD CAM# 14110-676-600
**AUX IN CAM HEIGHT -
**MAIN IN CAM HEIGHT -
**MAIN EX CAM HEIGHT -


===PB2 Cam Profile===
*EL-1300001~ HMT CAM# 14110-676-740
One camshaft profile was used on both manual/auto for this year. USDM# 14110PB2020 / JDM# 14110PB2010
**AUX IN CAM HEIGHT -  
*AUX IN CAM HEIGHT - 33.328 - 33.648MM
**MAIN IN CAM HEIGHT -  
*MAIN IN CAM HEIGHT - 37.923 - 38.163MM
**MAIN EX CAM HEIGHT -
*MAIN EX CAM HEIGHT - 38.004 - 38.244MM


===Notes===
===Notes===
Redesign of the auxiliary valve across all 1981 Honda engine families for the CVCC-II update. Auxiliary chamber was brought closer to the combustion area for more efficient burning. Aux collar features five "torch" holes for mixture burning with a progressive wound spring and thicker valve holder. Piston crowns are dished per the newly updated compression ratio.
* Casting variations show HF "A" or "B" on front, most likely representing it was for an automatic or manual setup.


==1982 - 1983 CVCC-II Cylinder Head (PC1)==
==(PC3) 1982 - 1983 Non-CVCC Cylinder Head==


Eight port cylinder head (4 intake ports / 4 exhaust ports)  
Eight port cylinder head (4 intake ports / 4 exhaust ports) for 82-83 Honda models. Intake valve diameter increased by 1mm (35mm), Exhaust valve diameter increased by 2mm (30mm).  
* USDM EK1-4500001~ Prelude (49 S)
* USDM EK1-4000001~ Prelude (CALI)
* USDM EK1-4900001~ Prelude (HI-AL)
* JDM EK1-1400001~ Engines Prelude (SN300 Models)
*Revised intake and exhaust spacing for better heat distribution and exhaust flow. This was done to better isolate the exhaust valves.
*Intake valve diameter increased by 1mm (36mm), Exhaust valve diameter increased by 2mm (30mm). Aux valve diameter (12mm). Piston is slight deeper dished than PB2 pistons, but not by much.  


[[File:82EK1CYLINDERHEADLAYOUT.jpg|750px|]]
* CDM/EDM EL-1400001~ Prelude (1982)


[[File:82-83ELCYLINDERHEADLAYOUT1.jpg|750px|]]
[[File:82-83ELCYLINDERHEADLAYOUT.jpg|750px|]]


===Specs===
===Specs===
* 8.8:1 Compression (9.3:1 debatable per technical bulletin)
* 8:8:1 Compression
* 75 HP @ 4500 RPM  
* 80 HP @ 5000 RPM  
* 96 ft lb Torque @ 3000 RPM
* 93 ft lb Torque @ 3500 RPM
* Redline @ 6000 RPM
* Intake valve diameter (36mm), Exhaust valve diameter (30mm).


===Engine Weight w/ Trans===
===Engine Weight w/ Trans===
* 5spd - 351.6lbs (159.5kg)
* 5spd -  
* Auto - 392.6lbs (169kg)
* Auto -  


===PC1 Cam Profile===
===PC3 Cam Profile===
Two camshaft profiles were used on the manual/auto for this year. Manual USDM# 14110-PC1-020 / Auto USDM# 14110-PC1-902
* EL-1400001~ 5SPD & HMT CAM# 12251-PC1-000
*AUX IN CAM HEIGHT - 33.328 - 33.648MM
**AUX IN CAM HEIGHT -  
*MAIN IN CAM HEIGHT - 37.923 - 38.163MM
**MAIN IN CAM HEIGHT -  
*MAIN EX CAM HEIGHT - 38.004 - 38.244MM
**MAIN EX CAM HEIGHT -  
 
Japanese versions used two camshaft profiles (PC2) for the manual/auto. Manual USDM# 14110-PC2-010 / Auto USDM# 14110-PC2-901. Not much is known about these cams compared to the PC1 versions.


===Notes===
===Notes===
82-83 EK/EL heads are not compatible with 79-81 EK/EL heads due to a change in block changes. As you can see in the picture below (blue felpro gasket is the 82-83 head), the two rear head bolt locations and coolant passages are different, making it impossible to put a newer head on an older block.
* Depending on location, this cylinder head may be casted with HF "C" on the front. The spark plug numbers are casted directly under the valve cover, where the previous heads were casted above the spark plug holes. Cam gear is of a solid metal type design, versus the older start shaped.
 
[[File:82vs81Headgasketdifference1.jpg]]
[[File:82vs81Headgasketdifference2.jpg]]
 
The newer cylinder head design created a change in combustion efficiency across the board for all 1982 Honda engine families. The intake and exhaust valve angles were slightly changed and the roof of the combustion chamber is lowered by 1.4mm. This head can only be used on an 82-83 block, but will not fit 79-81 blocks.
 
 
[[File:81-82CVCCcombustiondifference.jpg|600px|]]
 
==Engine & Transmission Serial Numbers==
 
===USDM MARKET===
[[File:SNPRELUDESERIALCHARTUSDM.jpeg]]
 
===JDM MARKET===
 
[[File:SNPRELUDESERIALCHARTJDM.jpeg|800px|]]

Latest revision as of 16:52, 1 May 2024

The EL 1.6l engine was manufactured by Honda Motor Company between 1979-1983 for the 1st generation Honda Accord and 1st generation Honda Prelude. It is part of the E-series of Honda engines. Introduced new for the 1979 model year, it replaced the standard EF. It was a water cooled, SOHC 8-Valve CVCC engine with a displacement of 1.6L (1602CC). Output varied as the engine went through two updates during it's production. The EL 1.6l engine was standard in Canada, Europe and Australian Markets. Transmission choices were an automatic 2spd/3spd or manual 5 speed.

The EL series is an interference engine!

There are three variations of this cylinder head, depending on the year Honda it was offered in.

Minor engine issues are known to occur, especially the cylinder head warping, causing a blown head gasket. The immense heat generated from the combined exhaust/intake setup could not exchange fast enough to the iron block, resulting in warpage. Honda tired to remedy this with an updated cylinder revision to help dissipate the heat, which lowered temps dramatically.

Overview

  • Displacement 1.6 L (1,602 cc)
  • Inline four cylinder, transverse
  • Cast iron block & aluminum silicon alloy cylinder head
  • Redline limit - 79-80 Models 5,800 RPM, 81-82 Models 6,000 RPM
  • Two barrel Keihin Carburetor w/ manual choke
  • Electronic Ignition
  • Belt driven timing gear
  • Liquid Cooled - Thermostat controlled fan
  • Electric Fuel Pump
  • Oil Cooler (or provision on the block)
  • HF-3 = Automatic / HF-5 = Manual

Engine Block

Cast iron block with integrated water pump insert and large oil passages. Three versions exist (689, PB2 PC1) with additional manufacturing refinements and accessory bolt holes. Blocks are identical for both manual and auto trans per there version. They essentially the same as the EK 1.8l blocks, but with minor changes.

Specs

  • 77mm bore x 86mm stroke (3.031 in × 3.386 in)


(676-1) 1979 - 1980 Non-CVCC Cylinder Head

Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1979-1980 models.

  • CDM/EDM EL-1000001~ Prelude (1979)
  • CDM/EDM EL-1200001~ Prelude (1980)
  • CDM/EDM EL-1300001~ Prelude (1981)

Specs

  • 8:4:1 Compression
  • 73.5 HP @ 5000 RPM
  • 90 ft lb Torque @ 3000 RPM
  • Redline @ 5800 RPM
  • Intake valve diameter (34mm), Exhaust valve diameter (28mm).

Engine Weight w/ Trans

  • 5spd -
  • Auto -

676-1 Cam Profile

Three camshaft profiles were used on the manual/auto for these years.

  • EL-1000001~ CAM# 14110-676-640
  • EL-1200001~ CAM# 14110-676-641
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -
  • EL-1300001~ 5SPD CAM# 14110-676-600
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -
  • EL-1300001~ HMT CAM# 14110-676-740
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -

Notes

(676-2) 1981 Non-CVCC Cylinder Head

Eight port cylinder head (4 intake ports / 4 exhaust ports) for 1981 models. Same as 676-1 but with 1mm larger intake valves (35mm).

  • CDM/EDM EL-1300001~ Prelude (1981)

Specs

  • 8:4:1 Compression
  • 75 HP @ 5000 RPM
  • 90 ft lb Torque @ 3500 RPM
  • Redline @ 6000 RPM
  • Intake valve diameter (35mm), Exhaust valve diameter (28mm).

Engine Weight w/ Trans

  • 5spd -
  • Auto -

676-2 Cam Profile

Three camshaft profiles were used on the manual/auto for these years.

  • EL-1300001~ 5SPD CAM# 14110-676-600
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -
  • EL-1300001~ HMT CAM# 14110-676-740
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -

Notes

  • Casting variations show HF "A" or "B" on front, most likely representing it was for an automatic or manual setup.

(PC3) 1982 - 1983 Non-CVCC Cylinder Head

Eight port cylinder head (4 intake ports / 4 exhaust ports) for 82-83 Honda models. Intake valve diameter increased by 1mm (35mm), Exhaust valve diameter increased by 2mm (30mm).

  • CDM/EDM EL-1400001~ Prelude (1982)

Specs

  • 8:8:1 Compression
  • 80 HP @ 5000 RPM
  • 93 ft lb Torque @ 3500 RPM
  • Redline @ 6000 RPM
  • Intake valve diameter (36mm), Exhaust valve diameter (30mm).

Engine Weight w/ Trans

  • 5spd -
  • Auto -

PC3 Cam Profile

  • EL-1400001~ 5SPD & HMT CAM# 12251-PC1-000
    • AUX IN CAM HEIGHT -
    • MAIN IN CAM HEIGHT -
    • MAIN EX CAM HEIGHT -

Notes

  • Depending on location, this cylinder head may be casted with HF "C" on the front. The spark plug numbers are casted directly under the valve cover, where the previous heads were casted above the spark plug holes. Cam gear is of a solid metal type design, versus the older start shaped.
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