For the love of a tractor engine: The life and times of the 18R-G

[timbosaurus]

Thanks Mate... but I should probably be more clear, I'm using aftermarket ECU that can drive high or low impedance.

So I'm curious to know what will physically fit in the EFI manifold.

A fellow toymodder was kind enough to sell me the manifold, but unfortunately (or fortunately perhaps) it doesn't have the stock injectors, so it is time to buy some newies.

Since it will be a sensible NA engine, i'm sure 300cc/min will be plenty.

Will most common PFI injectors (high or low z) drop straight into the manifold? If I get, say, some new commodore top feed injectors will they fit OK (ignoring wiring)?

[TA-022]

go down to the pick a part with the fuel rail

[RAd28]

hey guys.. on the way to work this morning, i hooked the ol' gal around a round about, and she started to cough and splutter on the way out... was just a straight through round about, dog-leg left, dog-leg right then your on your way...
only thing i could think of is something to do with the carby bowls, but i'm not sure why it would cough like it did....
performance on gentle corners, or straight lines didn't suffer at all, but the idle at traffic lights seemed much lower ~500rpm...

any suggestions?

[o_man_ra23]

gunk in it got shaken loose?? Floats bent themselves??

As for the injectors, TA-022's idea is good, or you can go down to an injection specialist and ask them Take the diagram you put up for reference, as well as the manifold and fuel rail. I have a feeling though that 22RE injectors will be your friend on this one

Cheers, Owen

[crowncustom]

As to the question of RC to RG it definitely can be done using all the necessary RG bits.
I've just finished rebuilding and doing this.
I used the RC block,rods,pistons,crank.
All the associated RG bits bolt straight in or on,RG aux shaft,oil pump,oil pump drive,timing cover,breather plate
and there is plenty of room using the RC dipstick also.
And the RC pistons do not go anywhere near the valves so no need to have reliefs machined into them.
As to performance I don't know what the rebuilt motor goes like as it's not in the car at the moment(XT 130 Rona).
But I did rebuild an RG a few years ago and used RC pistons and rods and it performed very well so the question is that YES it can be done.
Cheers Brett.

[o_man_ra23]

I just thought of something... I have a 16R bottom end in my RA40... so if I keep that bottom end, rebuild with 18R crank and 22R flat top pistons, I should be pretty set eh?? The 16R rods are longer arent they?? to take into account the higher gudgeon pin height of the 22R pistons... so no offset grinding needed?? I also have a closed chamber 18R head to play with

Cheers, Owen

[RAd28]

higher gudgeon pin height of the 22R pistons...

i thought it was LOWER gudgeon pin height ... hence when you put 22R pistons in an otherwise standard 18RG you ended up with lower comp

[The Witzl]

Timbo,

I'm using 22R-E injectors in my 18R-GE on MS-II. They are good enough for the job, and working quite well for me. Dont need any extra flow unless you have a hot engine there.

Just a standard top-feed "Denso" injector will fit.... so there are heaps to chose from. Just go pinch injectors from Toyotas at the wreckers - aim for an RT142 corona.

[o_man_ra23]

Ok to clear up the confusion (I think we are trying to say the same thing with different logic Gerrard), the 22R pistons have less distance between the crown and the gudgeon pin (so the pin sits higher at TDC than the 18R item) so you need longer rods otherwise there will be a gap between the piston crown and the block face... giving less compression.

Can anyone confirm that I am correct from my research that the 16R rods are longer (from the 16R crank having a shorter stroke and the same bore giving it the 100cc less than the 18R) than the 18R items, and are the correct ones for matching 22R pistons to 18R cranks in 18R blocks to give a 2.2L 18R??

Cheers, Owen

[Norbie]

I'm in the middle of cleaning up my garage and there are a few 18R-G bits I should probably sell (much as I hate selling stuff). Is anyone here interested in a cheap turbo setup? I have a S4 RX7 turbo, custom manifold and dump pipe to suit an 18R-G in an RA23 Celica.

Also I don't know if this is worth anything these days but I have a pair of Solex's on an 18R-G manifold. Can't say much about them because I've never used them, but they came off the engine I bought from Owen so maybe he can shed some light.

[o_man_ra23]

Those carbs were thoroughly cleaned, not bead blasted. All gaskets still good cond, no noticeable damage, and have been known to run well when not suffering electrical dramas. Jets werent clogged and didnt have real damage, though the screwdriver sections on the heads arent the best. I think one of the idle needles has a crappy end... the rest are ok. Both chokes work perfectly.

Cheers, Owen

[Gunna]

I brought a 18RG with RC bottom end that a guy i know put together and was going to use it till i found out about how crap compression was going to be so i brought a pulled down RG and im building one out of the two. But the guy i brought the mixed one off seemed to think it went pretty fast...

[The Witzl]

I'm in the middle of cleaning up my garage and there are a few 18R-G bits I should probably sell (much as I hate selling stuff). Is anyone here interested in a cheap turbo setup? I have a S4 RX7 turbo, custom manifold and dump pipe to suit an 18R-G in an RA23 Celica.

Also I don't know if this is worth anything these days but I have a pair of Solex's on an 18R-G manifold. Can't say much about them because I've never used them, but they came off the engine I bought from Owen so maybe he can shed some light.

Dont sell off the turbo 18RG stuff norbie!!!
... unless you have something else to use?

Otherwise - i'll use them for now

[Steve M]

And the RC pistons do not go anywhere near the valves so no need to have reliefs machined into them.
But I did rebuild an RG a few years ago and used RC pistons and rods and it performed very well

The 18RG valve cutouts go below the deck of the block, so using STD 18R-C flat pistons your basically stuck with using stock cams. Any upgrade and you'll have to set your cam timing so far out to avoid popping valves that the engine won't run well.

Flat top pistons in an 18RG will give you a compression ratio of about 7:1 if I remember correctly. I think you'd be wanting to turbo that or you'd be way down on performance from a standard 18RGU.

[crowncustom]

The 18RG valve cutouts go below the deck of the block, so using STD 18R-C flat pistons your basically stuck with using stock cams. Any upgrade and you'll have to set your cam timing so far out to avoid popping valves that the engine won't run well.

Flat top pistons in an 18RG will give you a compression ratio of about 7:1 if I remember correctly. I think you'd be wanting to turbo that or you'd be way down on performance from a standard 18RGU.

How can the RG valve reliefs be below the deck height at TDC when they are high top pistons and they sit above the deck at TDC?

When I did the rebuild years ago I also done a comparison on what the RG went like with the high comp pistons and the flat tops and the only difference was with the flatties it rev'd alot smoother and did actually rev a little higher than the high tops.
Performance wise there was no difference between the two.Fuel economy was the same and it was setup in the timing exactly as a RG is meant to be setup,and this was in a 1966 Corona 1600'S with a W50 and 4.111 diff and 13" wheels.
Cheers Brett.