Toyota R Engine History

[crowncustom]

Yes Owen that was it about the twin plug 18RG, if I remember I think I have some info about these engines on my computer somewhere i'll post it if I have.
And regarding the 2R,9R,and the 2R is definitely 1.5 litres and the 9R came out in the RT55 Corona GT 5.I do have pics of one if someone can tell me how to post them?
The 4R engine came out in the RT40 Corona 1600S.They were identical to the 2R block with increased bore size(1587cc opposed to 1490cc)had factory twin Asian SU carbs,9.2 high comp pistons,highlift cam which used longer lifters than the standard 2R and shorter pushrods.Factory ported head with larger valves and a balanced bottom end.I owned 2 of these Corona's.
Cheers Brett.

[aussie_stu]

ah well seems chances of finding an 8r head are slim, have been comtemplating an 8r/18r hybrid

[mike1980ra40]

ah well seems chances of finding an 8r head are slim, have been comtemplating an 8r/18r hybrid

hows this for a hybrid. one of my early celicas (1979 jap import) had a bizarre setup.
cylinder block was 20R and the head was 18R (if not it was 18R valve cover on 20R head ? )

anyway tell tale signs it was a 20R block was the first 3 digits on the engine number,
S shaped oil pick up tube and the air injector manifold. another thing that makes me think
there was an 18R head on this was the fact that the valve cover had 18r stamped on it
and I am using the extractors from it on my 18R right now.

Also it was running a 16R dizzy with Lumenition optical ignition.

It makes me think... if an 18R head was on a 20R block, then an 18RG head should as well.
then maybe stroke it with 16R conrods. ???

[o_man_ra23]

20r block and 18r head dont mate... not without super mega custom setups. 2XRs are interchangeably between heads and blocks, and 18R and previous are interchangeable between motors with similar valve train setups(pushrod head wont fit OHC bottom end)

Also, 20R runs its oil pump from the crank, whereas 18R runs oil pump from the auxillary shaft. 20R doesnt have an auxillary shaft, and runs single row timing setup, 18R runs dual row timing.

If there is an 18R head on a 20R bottom end... the 20Rs are rare as rockin horse crap here in aus, and there is a LOT of custom work done to that motor (plus the 18R head is crap, so why would you bother?? 20R head is soooo much better)

I want to see more about the twin spark 18RG.... PLEASE!!

Cheers, Owen

[mike1980ra40]

what ever the top end setup was it was punchy motor and had a 3.9 diff in it and went
nice and hard. I was kicking my self several months after I had it all sent of to scrap

cheers.

[Stefan]

2XRs are interchangeably between heads and blocks

Not true. To refer to my post in this thread:
http://www.toymods.net/forums/showthread.php?t=8442

OK guys, this is the deal. In the US, they mod 2xR engines and ahve aftermarket support. Here, there really isn't any. There are 2 versions of the 22R, with different C/R, incompatible (without milling etc) heads, etc. We got the later version in '85 with the RA65, that other parts of the world (i.e. US) got along with later, TCCS EFI... but we got it with the older Analog EFI. My guess is that this is becasuse the analog EFI could be tweaked to cope without an O2 sensor - we were on leaded petrol at the time. Later 'ronas got the TCCS EFI, AFAIK. The Analog EFI is more 'tweak friendly' IIRC.

A 21R is similar to an early 22R, so the head wil not directly swap, AND it is not like a 20R anyway so there is no benefit from doing so.

The main ways to improve a 22R are extractors, cams, porting. Mild cam will work with unported head, as the stock cam is so poor, but anything more needs headwork. Cams would have to be bought from the US, really... I ran the specs of the Crow Cams 22R cam by the guys in the US and they we're impressed. Extractors can be bought here. If you did all this, I imagine the engine would be quite thirty and would have cost a bit... but at least it would be tough.

[RT104GT]

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,

8RG was fitted to 1900gsl, not ony have I seen one I drove the car owned by Don Bruce Toyota in 1972.

There was an 8RG coupe for sale on ebay last year..

[RT104GT]

ah well seems chances of finding an 8r head are slim, have been comtemplating an 8r/18r hybrid

I heard of an 8R head in a 1900sl in Stawell a few months ago.

I fitted an 8RB head on an 18R in 1974.

I have used an 8RB in a 1600S then the 8RB on an 18R.

I ran a weber single and extractors.

It was never as fast as my 18RG.

8Rb cam gear is same as TOYOTA 18rg (Not yamaha).

[soulfire]

I have a bucket load of information on hybrid 21r/22r motors and i have also squished a lot of rumors.

To keep it short and sweet, I am running a 21r-c head on a late model 22r block with very minor modifications!

[river]

Hi,

I'd like to know what came first... the 18R or the 18R-G?

If it's the 18R then some dude would of looked at it and said it's a load of crap and designed a better head to make the 18R-G.

Alternatively, if the 18R-G came first, did some clown come along and say "hey, I can turn this wonderful engine into poo" and thus turned the 18R-G into an 18R.

I have never understood why the 18R did not have a crossflow head like the 2T.

seeyuzz
river

[MWP]

Reason behind the 18R non-xflow head would be emissions and fuel economy.
Both of which are improved by heating the inlet manifold, increasing fuel atomisation.
Bad for power of course tho

[river]

Hi,

Hmmm, well I wouldn't exactly say the 18R-C is a prime example of fuel efficiency.

seeyuzz
river

[hosking1991]

I have to disagree with you river sorry , my 18rc in my ra40 was fully reco'd with a stage 2 cam and weber carby jetted to suit and would pull 11 litres per 100k's round town and around 9-10 on a trip

[Steve M]

I got 7L / 100km from my 1mmOS 18R-C. I was very happy.
I wasn't so happy about it revving at 4000RPM at 100km/h in fifth gear, but at least it was cheap to run.

I guess that old theory of driving close to maximum torque for best fuel efficiency may be correct.

18R was a 'commercial' type engine in the 1960's wasn't it?. That would explain the lack of exitement provoking design.

[hosking1991]

I have to disagree with you river sorry , my 18rc in my ra40 was fully reco'd with a stage 2 cam and weber carby jetted to suit and would pull 11 litres per 100k's round town and around 9-10 on a trip

also that economy was with me giving it a hard time 6200 rpm shifts LOL