Editing Toyota R engine (section)

===8R===
[[File:8R engine in a 1971 Toyota Hilux.jpg|thumb|Toyota 8R engine in a Hilux]]

The {{convert|1858|cc|L|1|abbr=on|order=flip}} '''8R''' The engine was produced from 1968 through 1973.<br />
Cylinder bore and stroke was {{convert|85.9x80|mm|in|abbr=on}} with a five bearing crank.<br />
It was also available as the '''8R-D''', dual SU '''8R-B''', [[Electronic fuel injection|EFI]] '''8R-E''', Californian-spec '''8R-C''' and [[DOHC]] '''8R-G'''.

It was a major departure for the R family.  With a 2-valve [[SOHC]] head, it impressed contemporary reviewers – ''[[Road & Track]]'' praised its quietness and free-revving nature.

The 8R engine has a closed chamber head vs the open chamber of the 18R-C.{{cn|date=December 2020}} The 8R-B has dual side draft [[SU carburettor|SU-type]] Aisan carburettors with the float bowl under the body and vacuum activated power valves with strangle plates for chokes and liquid cooled intake with a balance tube.{{cn|date=December 2020}}

Toyota upped the ante again with the [[DOHC]] (but still 2-valve) '''8R-G''', produced from 1969 through 1972. From 1969 to Feb 1971 it was known as the '''10R''', but along with a removal of the tensioner gear in the interest of quieter operation, it was renamed the 8R-G to reflect the decision that twin-cam engines were henceforth to be identified by a "-G" suffix.<ref name="TC27">{{citation | title = All About the Toyota Twin Cam, 2nd ed. | url = http://www.3sgte.com/page_29.htm | page = 27 | publisher = Toyota Motor Company | year = 1984 | location = Tokyo, Japan }}</ref> 4,931 twin cam engines were built, all installed in the [[Toyota Corona Mark II]] (RT72) 1900 GSS. The 10R/8R-G weighed in at {{convert|170|kg|abbr=on}} and as such was both lighter and more compact than its less powerful predecessor the '''[[#9R|9R]]'''<ref name="twincams">[http://www.3sgte.com/page_8.htm ''Toyota Twin Cam''], p. 6</ref>

{| class="wikitable"
|-
! Code
! Power
! Torque
! Compression
! Years
! Comments
|-
| 8R
| {{convert|81|kW|hp PS|0|abbr=on}} at 5,500 rpm
| {{convert|153|Nm|lbft|0|abbr=on}} at 3,800 rpm
| 9.0
| 1968–1972
|
|-
| 8R-B
| {{convert|82|kW|hp PS|0|abbr=on}} at 6,000 rpm
| {{convert|152|Nm|lbft|0|abbr=on}} at 4,000 rpm
| 10.0
| 1969–1971
| Dual [[SU carburetor]]s
|-
| 8R-D
|
|
|
| 
|
|-
| 8R-E
|
|
|
| 
| EFI
|-
| 8R-C
| {{convert|81|kW|hp PS|0|abbr=on}} at 5,500 rpm
| {{convert|174|Nm|lbft|0|abbr=on}} at 3,600 rpm
| 9.0
| 
| Californian emissions controls
|-
| 8R-G
| {{convert|104|kW|hp PS|0|abbr=on}} at 6,400 rpm
| {{convert|166|Nm|lbft|0|abbr=on}} at 5,200 rpm
|
| 1969–1972
| DOHC, dual side-draft carburettors
|}

Applications:
* 1970–1971 [[Toyota Hilux]], {{convert|72|kW|hp PS|0|abbr=on}}
* 1971–1973 [[Toyota Corona]] 1900 hardtop
* [[Toyota Corona Mark II]] RT72 Corona Mark II 1900 hardtop
* [[Toyota Corona Mark II]] RT72 Corona Mark II 1900 hardtop GSS (8R-G)