The 18R-GTE reference manual ...

[Turbo RG]

Here is few pics of the 20R pistons in the 18r block








does anyone have pics of a stock 18RG piston in and out of the block?
Karey

[JustenGT8]

Hey Karey,
Hats off to you, your proj looks awesome in all regards.

For me it's not a question of try though but already done in reference to the 22R crank. Why? torque of course ;-) It was built for a 4WD originally but now will find a home in a RA23.

For mine, i agree with you and if i was building from scratch i would use the 18RG crank. But this engine is what i have to work with and i can guarantee i'll have a solid performer once i give it a few little tweeks....

besides, it's fun geeing up Witzl and co with their sewing machines :-)

As for Steve, i'm sure he has his reasons and no harm in trying something different, you never know what it might produce. How many have you heard going from a 3.7 to a 2.9:1 diff in search of more acceleration ? Clearly worked though

[Turbo RG]

Let me say this to you.
your one of the main reasons I started to do a turbo 18RG project.
you gave me so much info.
I just want to take some time and say Thank you....
and I will be watching your next RG project.
Karey

Hey Karey,
Hats off to you, your proj looks awesome in all regards.

For me it's not a question of try though but already done in reference to the 22R crank. Why? torque of course ;-) It was built for a 4WD originally but now will find a home in a RA23.

For mine, i agree with you and if i was building from scratch i would use the 18RG crank. But this engine is what i have to work with and i can guarantee i'll have a solid performer once i give it a few little tweeks....

besides, it's fun geeing up Witzl and co with their sewing machines :-)

As for Steve, i'm sure he has his reasons and no harm in trying something different, you never know what it might produce. How many have you heard going from a 3.7 to a 2.9:1 diff in search of more acceleration ? Clearly worked though

[Norbie]

Let me say this to you.
your one of the main reasons I started to do a turbo 18RG project.

Justen is the exact reason I started a turbo 18R-G project, in fact I have his old turbo setup which he sold me 7 or 8 years ago. So there you go, Justen has a lot to answer for.

[Turbo RG]

Justen is the exact reason I started a turbo 18R-G project, in fact I have his old turbo setup which he sold me 7 or 8 years ago. So there you go, Justen has a lot to answer for.

your another person I watched for some time....

[Steve M]

Why are you guys trying to used 22R pistons?
you should try to use some kind of dome piston.
22r pistons are flat top or dish.
Also so
to me. putting the 22R crank in the 18R block is too much work and the cost is too high
to get the 22r crank to fit.
to get it to work right you have to do a lot of machine work to the center of the block. it also needs custom pistons and custom rods.

Doesn't necessarily need custom pistons and rods. Using the beefy 18RG/U, or for that matter, the less beefy 18R/-C/18RGEU rods and slightly modified 89mm 3T-C pistons should fit perfectly.

The early model (1981-1984) 22R pistons are dome top aren't they?

Is it only the centre of the block that has to be machined? How do all the seals line up?
I haven't bought a crank yet but would ideally love to know some details in advance.

I will be using a 22R flywheel as from reports it has a larger clutch mating surface than the 18R flywheel, plus, it should fit the 22R crank rather well.

I too like the look of your set up so far Karey, the only concern I see is those valve reliefs. Have you checked the clearance with your valves?
The early model 18RG pistons have intake reliefs 2.5mm below the deck and exhaust reliefs 1.5mm below the deck.

Oh, and Justen and Witzl, I have a series 1 digital SAFC that I was planning to use to correct the fuel signals.
Mostly I wanted to use the stock turbo ECU for spark and boost retard as M-TEU boost retard modules aren't easy to come by.
I planned to get a full loom and all sensors for the gen III engine to make it work. I had things offered to me.

[RA23]

does anyone have pics of a stock 18RG piston in and out of the block?

Here's an 18RGEU piston out of block. Sorry I am just by myself atm and I cannot get to a block to take photo of piston in block.

Apologies for shiphouse quality of pic

[jeffro ra28]

heres a piccie of 9.7:1 brand new.

They are for sale to!

[Turbo RG]

here are 10.5 to 1 forged pistons.
just looking for stock 18RG pistons in a block.
I have 8 18RG blocks here and I only have one with the stock pistons in it.
Now that block is now in my 72 celica with a CT26 supra turbo on it and I never took a pic of it.

[Turbo RG]

when you put the 22R crank in a 18RG block. It give the 18RG a longer stroke.
So with the stock piston and rod they will be to long and they will hit the head.
that's why you need a custom rod or custom pistons.

Doesn't necessarily need custom pistons and rods. Using the beefy 18RG/U, or for that matter, the less beefy 18R/-C/18RGEU rods and slightly modified 89mm 3T-C pistons should fit perfectly.

The early model (1981-1984) 22R pistons are dome top aren't they?

Is it only the centre of the block that has to be machined? How do all the seals line up?
I haven't bought a crank yet but would ideally love to know some details in advance.

I will be using a 22R flywheel as from reports it has a larger clutch mating surface than the 18R flywheel, plus, it should fit the 22R crank rather well.

I too like the look of your set up so far Karey, the only concern I see is those valve reliefs. Have you checked the clearance with your valves?
The early model 18RG pistons have intake reliefs 2.5mm below the deck and exhaust reliefs 1.5mm below the deck.

Oh, and Justen and Witzl, I have a series 1 digital SAFC that I was planning to use to correct the fuel signals.
Mostly I wanted to use the stock turbo ECU for spark and boost retard as M-TEU boost retard modules aren't easy to come by.
I planned to get a full loom and all sensors for the gen III engine to make it work. I had things offered to me.

[JustenGT8]

22R crank, 18RG rods, 22R dished pistons....no probs. Off the top of my head i think the squish area of the piston sits 0.5mm proud of the block deck. A 1.5mm HG and it's all good.

[Steve M]

Just some notes for future reference.

18RG Stock set up =
80mm stroke (divide by two)
138.3mm rod (eye-to-eye)
39.5mm compression height
Total Height = 217.8mm

22R crank/18R rod/3T piston set up =
89m stroke (divide by two)
138.3mm rod (eye-to-eye)
34.92compression height
Total Height= 217.72
DECK CLEARANCE = 0.08mm

22R crank/18R rod/22R-E piston setup =
89m stroke (divide by two)
138.3mm rod (eye-to-eye)
34.9mm compression height
Total Height = 217.7
DECK CLEARANCE = 0.1mm

Both non-standard setups look very doable to me!

[JustenGT8]

There you go, my memory was a little off but close enough. I pulled the sump off so i could get you guys some shots of the offset ground 22R crank and the slightly offset rods. Have to wait until tomorrow to post from work as they are stuck on my camera.

[JustenGT8]

Some shots of the offset ground crank and rods. I'll have to check the machining sheet but looks to me like bugger all taken off the rod and therefore they are a tad offset in the bore. Not ideal for big revs but then that's not what i'm looking at. You can see from the counter weights where they took material off.

[Mr DOHC]

heres a pic of a HKS 12.5:1 piston

http://img245.imageshack.us/img245/5781/img68228vr.jpg