18rg 2.2l ???

[brett_celicacoupe]

Just note that there is a difference between boring it out to 2.2l and stroking it out to 2.4l

The 2.2 (or 2150) is a rebore and correct pistons so if you are rebuilding the engine anyway it is not so bad. Mine ran 22-RE pistons however I planed to get custom forgies as the Cams had to be advanced or retarded to stop collisions

For the 2.4l the magical formula is 22-RE pistons, 22r/20r crank, 16r rods however these are rare as rocking horse p00. so mod work to the18r seems the way to go , but this is exxy.

Cheers
Simon

i must have been confused.....i thought the pistons and crank gave 100cc increase each.

my mistake

[river]

Hi,

Reboring it out will get you to 2.2ltres and stroking it will get you up to 2.4litres. You get about 200cc extra capacity for each of these operations, respectively.

However, as mentioned, stroking can affect the revability (for want of a better word) of the original engine.

The 2T-B not only had the dual carbs, but also a slight increase on compression ratio over the 2T. I would assume, but could be wrong, that the 18R-B would also have a slight compression increase over the 18R, as well as the dual carbs. I'll have to check and verify this before I commit.

seeyuzz
river

[RAd28]

in fear of being convicted of being a thread-cromaniac

can anyone offer specifics (or point me in the direction of specifics) on the 2.2L conversion? i'm starting to rebuild an 18Rg now, and just so happen to have a 22R sitting at the folks place which is mid-rebuild and has been for some years...

what crank is used? the 22r?
what rods?
what pistons?
what machine work? rebore, what about machining to allow for sweep of rods?
anything else?

[thechuckster]

don't forget that to do the 16R rod trick (if you can find them) also requires offset grinding of the crank.

I can't remember whether the 22RE pistons had the right gudgeon pin height or not for lowering compression ...

you'll have to come to the next TCCQld club meeting (tuesday night) and annoy Cliff Hansen about his 18RG.

[RAd28]

that's tuesday tonight is it? might come along... you guys meet at motorama archerfield don't you?

[thechuckster]

yes to both questions

[ta22gt]

I also have a n/a 2.2L 18RG with all the fruit ie. forgies, big cams, billet rods, twin 48s etc so if you want some info call me 0433103584
Nev

[RAd28]

got info on doing it on a budget? ie leaving some of the fruit out?

[river]

Hi,

Unfortunately, making an oversized angry engine isn't cheap and shouldn't be done on the el-cheapo, 'cos things usually break when you are giving it a bit of stick.

seeyuzz
river

[RAd28]

river - not "CHEAP" so much as "budget"... so not quite as tight arse as cheap so basically i'm trying to save money anywhere i can... if i can do oversized with the parts i have (or can get easilt), then i'll do it.. otherwise probably not.

[bnicho]

Yes, 18RB and 18RB have higher compression as well as the twin carbs. I have a set of twins off a 16RB. Maybe I'll actually fit them to the 16R one day!

8RB carbs are similar and the linkage parts should fit. I'm missing part of the linkage on mine too.

[ta22gt]

got info on doing it on a budget? ie leaving some of the fruit out?

Unfortunatley my engine owes me more than i care to remember but if you want a budget style build most of the info has already been covered earlier in this thread.
A good 2.2 is bucket loads of fun to drive with that extra torque.
When i pull my finger out and finish putting my car back together i will happily take you for a ride to see what it is like. I will warn you though you will be hooked straight away

[RAd28]

Unfortunatley my engine owes me more than i care to remember but if you want a budget style build most of the info has already been covered earlier in this thread.
A good 2.2 is bucket loads of fun to drive with that extra torque.
When i pull my finger out and finish putting my car back together i will happily take you for a ride to see what it is like. I will warn you though you will be hooked straight away

the info mentioned earlier in this thread is vaigue to say the least, i've been trying to reseach a basic 18RG upgrade, but keep coming up against brick walls,

i've no doubt the 2.2 is good fun, but i can't get hooked on anything anymore... last time i got hooked was on a 1G, and i bought one a few months later

[Steve M]

I'll try to clear up a few things about the 2.2L set up.

Type 1: easier - bore out block to suit 22R (early with dome) pistons with additional valve relieving and find an affordable source of 92.5-93mm bore head gaskets.

Type 2: harder (I'm doing this one at the moment) - stroke the bastard

18R-G block
- minor grinding to bore corners clears crankshaft weights (chamfered)
- clean up casting marks to clear rods (very minor, they only just cleared beforehand)

18R-G rods- big ends resized (not required for the conversion but always a good idea for rebuild)
- side ground for better alignment with pistons and crank (avoids offset grinding crank and allows the rod to fit into the big end.)
- balanced (do this last as side grinding will kill your balance)

21R-C / 22R crank
- main journals ground wider to line up with 18R-G block
- front section ground to suit 18R timing cover and front seal arrangement.
- balanced (do this last)

Pistons
- compression height of 35mm (standard 18RG is 39.5 -1/2 of 9mm stroke increase)
- late 22R ~ 34.9mm
- 3T-C ~ 35mm (available forged in 89mm but would need valve reliefs machined {beginning compression ratio using those pistons is 11:1 (arias 27.1ml dome) using 22R crank and 18R rods})
- fully custom pistons are available in whatever arrangement you'd like
- balanced as valve relieving may affect balance

Flywheel
- 22R flywheel has a larger clutch contact surface than 18R flywheel so you might as well use that one. Most likely better clutch availability too. They are heavy buggers though. Mine is now 8kg, rather than 11kg.

I might have forgotted something, but I reckon that pretty much clears it up.

[RAd28]

have a gander at this site... lots of performance 22R parts

LC Engineering

correct me if i'm wrong, but by default, 22r pistons used in a typcal 18Rg will result in lower compression? or is this later 22R, not early 22R?

would it be worth getting some of their (LCEng) early (81-84) 10.5comp pistons used with standard 18RG rods and crank? my understanding is that this would result in an undersquare bore, combined with lighter rotating mass of forged Al. pistons, hence more likely to rev hard? am i on the right tree or barking up the wrong track?

also, what's the key features to look for when distinguishing between older (pre '85) and later (post '85) 22R engines?