Toyota R Engine History

[The Witzl]

That head just doesnt seem right to be an 18R-G head.... the top rad / thermostat housing is mounted to the exhaust side.

BUT - that block looks 100% "R" to me.

[bnicho]

Hi,

Originally Posted by OSJ
no such thing as a 8RG or 10RG,just 10R.

Interesting. Can you provide documented evidence of this?

seeyuzz
river

He's half right. The 10R engine was supposedly renamed as the 8RG in 1971. See Stepho's website:

http://ourworld.compuserve.com/homep...o/engcodes.htm

Cheers,

[Steve M]

That head just doesnt seem right to be an 18R-G head.... the top rad / thermostat housing is mounted to the exhaust side.

BUT - that block looks 100% "R" to me.

Dead right there, that's definitely an R block, and the oil holes in the head are spot on 18R.
Would have to be some very limited run thing I reckon, what with the valves being 52mm/44mm and all. Those intake valves don't look much like my TRD valves, no dish in their head, but the exhaust valves do (from what I can tell from the photo).
Remember that 18R single cam engines have their water outlet on the left side of the car, so maybe this was designed to go in a car with an 8R or some other single cam R engine.

Jeffro, I don't reckon that gear set is complete, I just don't see how it would work with the top right cog obviously being designed for a chain drive.

*EDIT*
It is for either a 2TG of 3TG.
The chain drive kits only replace the bottom chain. That chain patterned gear in the top right actually replaces the large curved timing guide on the left side of the head.
Not sure if this is the case with the R series TRD ones, but the one picture is of the same design as 1980's HKS kits, but the bracket shape is different on that top one.

hmm, I wonder if RollMaster could make up an 18RG gear drive set??
If I remember later I might have a chat to a place over here that makes gear box cogs.

For those who are interested I found a manufacturer of 2TG kits and 2TG/18RG adjustable cam gears.

[urantia]

that explains why my corona kicked more ass then everone elses.

Dad picked up an 18-RU for $250, and that thing flew compared to other corona's.

[OSJ]

Sorry River you were right about the 8RG,I checked my master catalogue,the 10R(not 10RG)became the 8RG in 1971.This whole thing is making me twitch.The 10R and 8RG are just about identical.

[The Witzl]

Just got the following off an original Toyota engine ID plate....

Engine model - 2R
No. of cylinders - 4
Bore - 3.07in / 78mm
Stroke - 3.07in / 78mm
Piston Displacement - 90.9cu.in /

[andyroo]

The air-injected Japanese version, the 21R-U, produced 105 hp (78 kW) at 5200 RPM and 120 ft.lbf (162 Nm) at 3600 RPM

yeah boy! Go the Air injection!

[lilcrash]

comment withdrawn

[OSJ]

The 2R is a 1.5 litre,positive!

[lilcrash]

comment withdrawn

[o_man_ra23]

Jeffro, Perhaps that 8plug 18RG head was one of the VERY limited run race motors which were supposedly a german re-design of the Yamaha head. Though i thought those motors were 16 Valve. If it is the head im thinking of though, and the rumours are tru, then that head wont fit on a normal 18R block, there were special blocks made, 500 all told, which looked 18R, felt 18R, fit in the place of 18R, but had no numbers stamped, and different head fittings.

Wonder if anyone else has any more info on the rumours i heard about 5 or 6 years ago??

Cheers, Owen

[aussie_stu]

hey gang, ressurecting this one to ask, did aus ever get the 8R and if so what in?

[LeeRoy]

If you go to www.wikipedia.com/wiki/ and search toyota, there is a list of all their motors and im pretty sure it lists what they came in and where they were delivered.

- LeeRoy

[-==L=a=N=c=E==-]

Could you count the 2rz and 3rz engines? to me they are like beefcake 22r on steriods.

[bnicho]

hey gang, ressurecting this one to ask, did aus ever get the 8R and if so what in?

Hi,

The 8R was fitted to the RT72 Toyopet Corona Mark II 1900SL hardtop. These came to Aus in limited numbers in 1969-70.

Cheers,