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2025-06-28T09:02:43Z

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Here i will try to list all parts needed to swap any 4g91 displacement of 1.5 L (1,496 cc), ''4G92'' displaces 1.6 L (1,597 cc) or 4G93 is a 1.8 L (1,834 cc) engine of gen1 to mivec head.

Table shows part name in first column, then engine model and comment if that part is needed or not.
{| class="wikitable"
|+Comparison table of parts needed to to swap gen1 mivec head(started from top of engine to bottom of it)
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|Head assembly that will exclude both cams gears,
means that head is assembled from 3 peaces,

lower part in full, top part in full,

with all internal bolts nuts etc. all in place,

mounted with valve cover on top with all needed bolts seals etc.
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:Mivec head of gen1 without cam gears.jpg|thumb]]
|-
|Cam gears
|No - as it uses same cam gears
as mivec
|Yes
|No
|No
|Yes
|[[File:Cam gears that are same on gen1 4g9x dohc series engines.jpg|thumb]]
|-
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|CAS - cam angle sensor
|Yes
|Yes
|No - as it uses same
CAS as mivec
|No
|Yes
|[[File:4gx gen1 series CAS sensor.jpg|thumb]]
|-
|Intake manifold in full assembly - means it has everything
what is mounted on it.
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:4G92 DOHC MIVEC gen1 intake manifold with TB from top.jpg|thumb|This one just missing full rail and injectors ]]
|-
|Exhaust manifold
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:4g92 mivec exhaust manifold 4-2 part without heat cover.jpg|thumb]]
|-
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|Plastic mivec brand cover, or Mivec-MD cover
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:4g92 dohc mivec engine covers.jpg|thumb|215x215px]]
|-
|Top part of timing belt cover
|No - all doch covers of gen1
seems same
|Yes
|No
|No
|Yes
|[[File:4g9x gen1 dohc series TOP timing belt cover.jpg|thumb|172x172px]]
|-
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|Lower part of timing belt cover
|No - all doch covers of gen1
seems same
|Yes
|No
|No
|Yes
|[[File:4g9x gen1 dohc series LOWER timing belt cover.jpg|thumb|149x149px]]
|-
|Oil pump housing, with all pulleys,
hydraulic belt tensioner with all realted parts to it etc.
|No - It uses same principles
of lower parts of timing belt lower part
|Yes
|No
|No
|Yes
|[[File:4g9x DOHC gen1 lower timing belt view under belt cover.jpg|thumb|213x213px]]
|}

After all this list you might have all parts exluding electronic and management of engine.
{| class="wikitable"
|+Electrical parts needed for mivec head swap
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|ECU with codes:
Mivec silvertop ecu - 4828

Mivec blacktop ecu - 7035

mivec silvertop MD ecu - 4829

mivec blacktop MD ecu -7036

Mivec Japan ralliart ecu - 2910

mivec hongkong ralliart - 2264
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:Gen 1 mivec ecu 7035 and 4828.jpg|thumb|167x167px]][[File:Ecu loom of mivec.jpg|thumb|151x151px]]
|-
|Wiring loom of engine control
|Yes
|Yes
|Yes
|Yes
|Yes
|[[File:4g92 mivec engine wiring loom with 4828 ecu.jpg|thumb]]
|-
!Part name
!4g91 1.5 L (1,496 cc)[DOHC]
!''4G92'' 1.6 L (1,597 cc)[SOHC]
!''4G92'' 1.6 L (1,597 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[DOHC]
!4G93 1.8 L (1,834 cc)[SOHC]
!Pic of part
|-
|Dash cluster
|Yes
|Yes
|No - even it's only 9k/rpm
gauge it will work with mivec
|No
|Yes
|[[File:Order of 10k rpm cluster.jpg|thumb|190x190px]]<br />
|}
I think i have covered all needed parts for mivec head swap, it's also called topset mivec.

Gen1 MIVEC parts for full swap - Revision history

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