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Location:
Mornington Peninsula
Registered:
September 2002
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18R-G or 18R-C
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Sat, 10 May 2003 01:15
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Hi All,
Recently I purchased an 18-RG. I've given the head to a mate whoes trade is engine reconditioning. Long story short it is going to cost me about $600 for the head to be re-coed (not the whole engine, just the head) 
I've also been told that the 18R-G's don't go that much better than a slightly modified 18R-C. 
Would I be better to keep my slightly modified, just rebuilt 18r-C with webber and extractors?
or
Pay the money to get the head re-coed?
Suggestions and oppinions would be greatly appriciated.
Thanks
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 02:07
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What does an 18R-C make stock? Something along the lines of 80-90hp? The 18R-G makes something like 140hp doesn't it?
So in theory, you'd have to throw money at it to make up that extra 40hp, and then you've got an engine that uses more fuel and isn't factory. Just something to think about.
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Location:
Canberra
Registered:
December 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 02:11
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Is that $600 including labour or is it just parts?
If you can do most of the work yourself it will cost you hardly anything to rebuild a head i refaced all valves and bought 2 new exhaust because one was cracked and the other was too far gone for my liking the only thing left for me to do is some port and polishing (which i have never done before).
Personnaly i would go for the rg.
Think about it you have a engine that produces more horsepower out of the box so its going to be less outlay to start with. A lot of the parts are interchangable with the 18r-c so you can safe bucks there also.
When it comes down to it it is your choice but my vote would go with the rg.
0.02c
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I supported Toymods
Banned User
Location:
Brisbane
Registered:
May 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 02:13
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For that money I hear a 1G knocking on your door 
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Location:
Brisbane
Registered:
October 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 04:51
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i just jammed an RGU into my car, the RC that came out was only 60,000k old, made a huge difference, RC's make like about 70hp or so i think, i have my RGU bog stack except for the SMALL std 18RC exhaust and it still hauls ass, i'm going to willowbank tonite to see the time it'll really do.
with the RC i had trouble chirping 2nd with my hard as clutch, not it kicks sideways and i dont have a LSD.
it gets to 100 5 seconds quicker too.
as for the bad fuel consumption, i got 500k out of $50 {60L} and thats with me giving it some when i feel the need.
better than my 6 pot EFI commodore.
U cant beat the looks u get when ppl turn to hear those twin carbs screaming up the road at 7000rpm
[Updated on: Sat, 10 May 2003 04:52]
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 08:18
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well.... having gone from 18R-C to 18R-GU - i can safely say:
"18R-CRAP"
Seriously, the 18R-C barely moves, revs, responds, drives anywhere near as nicely as the twincam 18R-GU does!
And with that $600, you cen add to it a little porting, polishing, port matching, *oversize valves*, reground cams....etc. All of which would yeild results never SEEN in an 18R-C.
Trust me, you want the TWINCAM 8.
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I supported Toymods
Location:
Berowra-Sydney
Registered:
July 2002
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Re: 18R-G or 18R-C
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Sat, 10 May 2003 09:55
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I loved my 18-RC, i thought it was a great engine and makes the car look stock under the bonnet, but if i had an RG sitting around i would put it in no questions asked, rg is a cross flow head, RC is not so the RC really strugles to get air in and out.
go the RG if you've got it then use it and $600????? thats the cheapest bang for buck you can do
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Location:
Sydney - Northern Beaches
Registered:
January 2003
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Re: 18R-G or 18R-C
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Sun, 11 May 2003 07:41
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Not actually having an 18rg I can't really comment, however as has been said the rg has more hp standard and is a better more efficient engine, I'm dont really sure what your delema is??
I was looking for an 18rg earlyer in the year but ran out of money, if you want to offload the webber for the rc i could probably help you out?
Al
Message end.
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18R-G or 18R-C
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Sun, 11 May 2003 22:37
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Thanks everyone, I'm still deciding about what to do. The price is mate's rates so it's cheaper than it should be. I'll probably be able to pay in instalments so that won't be too bad.
At the moment I'll stick with the 18R-C that's in there because that's in really good condition and then I'll look at the 18R-G once I've got the car done up and on the road. That 18R-C will then go into my everyday car.
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Location:
Gold Coast
Registered:
October 2002
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Re: 18R-G or 18R-C
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Mon, 12 May 2003 05:35
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i thought there are a few versions of the 18rg
18 R-C 97hp
18 RG 140hp (these engines are actually quite rare)
18 RG-U read about 125 and 130 versions
18 RG-EU 120hp? cant remember off the top of my head.
you sure he is a mate? $600 seems a normal price to me if nothing else is done. our neighbour was quoted $900 for a 5k recondition to race specs if thats any comparison in price.
im sure if your 18 R-C has port/polish cam inlet manifold/carby and extractors/exhaust then it will probably go as well as the 18gru but driving arround town/in traffic it sure wont feel the same. the 18r g series will definatly have more useable power and it will be a less peaky piece of shit. it is also a better base for future upgrades.
but having said that if you already have a fresh 18R-C why not keep it and drive it arround while building up a monster 18rg 1ggte etc.
my 2 cents.
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Location:
brisbane
Registered:
March 2003
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Re: 18R-G or 18R-C
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Mon, 12 May 2003 11:43
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my 18rc went pretty hard and all it got was stock... then i ported/ polished the head and shaved it a bit it went alot harder then i pout a 34adm webber on it jetted down it went even harder again... so if youi have a 18rc thats in good condition it will go well it responds well with little mods... i dunno if it was just mine and had good luck from a stock one or not but my 18rc went preddy good stock... but yeah the 18rg goes alot harder and is a better engine for doing mods to... that if you get one with webbers in very good condition 
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18R-G or 18R-C
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Tue, 13 May 2003 02:18
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Yeah, he's a mate, it's just not his business. so there will be the little things that he doesn't charge for.
I think at the moment I'll stick with the 18R-C and slowly work on the 18R-G.
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Registered:
June 2002
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Re: 18R-G or 18R-C
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Tue, 13 May 2003 03:54
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What is being done to the head?
For $600 I would excpect new valves, guides and seals and a good clean up of the ports and shims done and new cam bearings. What is wrong with the head? craked?
If the head is in reasonable condition take the valves out and check for strightness.
Get the head crack tested and cleaned($50)
Deck the head to straighten(cost $30).
Get new valve guides ($100 tops)
Replace any valves that are bent cracked or burntout ($40 each but you shouldn't need to replace all eight).
Clean the ports and chambers up your self with a wire brush on a drill.
Re seat and install the valves and replace cam bearings ($40).
So as Jason has said do it your self and save your self up to $300. It isn't two hard but you will need to compress the valves. There are tools to do it for $30 or so but I just use a G clamp and some modified sockets
You will need a 18rg head gasket set with valve stem seals to suit the 18rg, 18rc ones do not fit but a 18rc.
But $600 seems a little excessive considering you could buy another 18rg with a good head.
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Location:
Canberra
Registered:
December 2002
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Re: 18R-G or 18R-C
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Tue, 13 May 2003 22:23
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Hey Roger
Where do you et all those parts for the rg so cheap i think i paid about $120 for a intake or exhaust valve from toyota.
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Location:
Mornington Peninsula
Registered:
September 2002
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Re: 18R-G or 18R-C
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Tue, 13 May 2003 22:35
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The head is basically stuffed. It has been sitting for that long that everything has got very rough and even looks a bit rusted in some spots. 
Apparently it's not cracked but everything else in it's just had it. I got photo's, I just don't have a scanner otherwise I'd post them here so everyone can have a looksee!
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 18R-G or 18R-C
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Wed, 14 May 2003 00:28
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Doesn't the WITZL have a few heads? Buy one from him or something  Just gotta be persuasive in getting him to let go
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Registered:
June 2002
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Re: 18R-G or 18R-C
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Wed, 14 May 2003 01:26
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Jason,
The prices I gave where estimates based on prices for other engine. I was lucky when I got my 18rg valves checked they where ok. $120 for a standard valve is expensive. Try repco if they don't have the one you want chances are they have one that is almost identical. Also try IDB richmond victoria.
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Location:
Brisbane
Registered:
October 2002
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Re: 18R-G or 18R-C
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Wed, 14 May 2003 10:54
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dont fogret that VRS kits arent't free, i paid $320 for a re-face, VRS and pressure test, and that was mates rates
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