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

[JustenGT8]

With that spec engine you will piss it in. My old n/a made 112rwkw@5000rpm on a milder bottom end, with just decent cams and head port.

92mm bore is fine n/a and will actually make the engine revs a smidge more freely.

pretty much any gasket will be fine for n/a but a MLS can't hurt given your high comp ratio and the rish of a little bit of det.

Endorse light flywheel and as far as i have seen they are all good. Back in the day i had to have my own custom made and it was around 6kg for a very noticeable improvement.

You need cams, get cams !! 272 total duration and 11ish mm lift will do the job nicely. Mine also had TRD oversized valves, which i would suggest. Keep the porting to jst a tidy up and it will still be very streetable but with an orgasmic induction roar?

[Zammo]

i got some advice

next time someone wants 10.5 or 11:1 cpr pistons do a group buy

i need some and im sure others do to

[JadeEstevez]

^ I'd be keen for some.

[Rens]

I'm keen when if we get the numbers to go ahead

[RA35GT]

I was hoping to run a 4.3KG flywheel too. I've read about the last 15 pages where I came across this:

"The DCS Steel Billet Flywheels are made from 4340 Billet Steel and CNC machine to the tightest tolerances...
Clutch Flywheel and Parts Supplier - Delivery Australia-wide and International
Middle of Second row down.

$385 for flywheel + $85 for new ring gear (Amayama/Toyota) = New lightweight flywheel."

Is this the best value flywheel atm? What's the go with some people opting for 22R flywheels instead? What's involved in using one? Pros and cons?

Stephen,

Not sure about that being the best value, it was the easiest though. Direct Clutch were awesome to deal with.
Not sure what weight the standard DCS steel flywheel is, I might need to measure mine sometime! (DCS can do custom weights as well though!)

Using a 22R flywheel may open up options for clutch kits?? Not sure on that.
One con would be needing to redrill/tapping your crank for M11 bolts instead of using the factory M10, which isn't major but is still extra work.

[Suavemechanic]

bottom end is common to the 18 r ,so i got my bearings from the local parts store they were like $20 for the big ends....
do not throw out the half moon bung things in your head !
you will be needing them and they are no longer easy to find ( and no they dont just come in the top end gasket set )

[RA35GT]

Half moons were available from toyota couple years ago.

Worth checking!

[timbosaurus]

You guys all suck, no one wanted a GB when I got mine!

I went through ToySport, as they were the best value. There were some issues which meant it took quite a long time to arrive, but there's nothing to say that would happen to you. He may even have them in stock.

I'm no expert, so I simply took Joels advice as he's been involved in toyota motors for many years!. He suggested 91.5mm, because the extra 0.5mm does fuck all for performance, but 92mm really pushes the boundaries on the block - a life sentence so to speak. Comp is 11:1, but only you can decide on the comp to suit your modifications (cams/headwork/ignition/fuelling), what fuel you want to run, what you plan to do with the motor and what you expect out of it (it's not just about a power figure).

I also got a graphite HG through him at the same time. It's what he uses on his engines and he reckon it handles the heat a lot better.

[SilverRA23]

I bought arias pistons.. went 92mm and 10.5:1 - figured I might as well take it all the way out... and the compression ratio was just to give a bit of a safety net should I get some dud fuel (as did happen travelling down the south coast of nsw)

my engine builder was of the belief that the standard head gasket would not work with the 92mm bore, so we got a cometic one

no idea where he got the bearings from.. I think just every day acl ones for an 18r... and we used ARP hardware where we could get it.

i get a little bit of what I think is piston slap when the engine is cold.. this is common for arias pistons if you do a google search on the subject.. i thought it was bearings at first so was a freak out the first time i heard it.

[o_man_ra23]

My engine builder got King bearings. Easy to get, not much more expensive than the cheapos from the local shop, and have a good rep. With a 92mm bore, you will want to look at a Cometic or similar overbore gasket. The fire rings from an 88.5mm gasket are likely to not seal and protect properly once you go all the way out to 92mm.

Another thing you want is head studs. There are a few options out for that, check this thread and the 18R-GTE reference thread. The reason for wanting the studs over the factory bolt in your case would be about 10% because of improved holding characteristics, and about 90% because the old ones will be corroded and fooked, and getting factory replacements isn't the easiest thing in the world. Might as well upgrade.

From what I have read, the piston slap experienced when cold is more a forged piston thing rather than simply the Arias pistions. It's to do with the expansion characteristics of the aluminium slugs. Cast units don't seem to do this (less expansion, thus tighter cold tolerance maybe?)

As for the flywheel, per my PM, much easier just to get an 18R one (I would have had a 6 month wait and didn't know about the DCS ones at the time), and the clutch kits are identical between 18R and 22R as far as fitment is concerned, it is only the throwout bearing which is different between early W50 and later W50/W5x boxes. Just get the clutch kit to suit the car the gearbox came from.

['ol_skool_'75]

Chasing some standard sized piston rings, but with a 1.5mm thickness. Anyone know where they can be had?

Cheers

Bear

[JadeEstevez]

Hey bear, why 1.5mm thickness?

If you take them to a good engine builder they can usually source them really quick.

['ol_skool_'75]

Speaking with Robin, he wants some because it'll help it rev (or something like that). I've told him the 3mm ones are easy to get but he doesn't want them

[JadeEstevez]

Really? thinner ring makes it rev better?





Seriously though, I'd like to learn more about that O__o

[JadeEstevez]

I'd consider going to an engine builder though... If they can source custom bearings then why not piston rings