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Location:
Paralowie, Adelaide
Registered:
May 2002
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Location:
Brisbane
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 08:43
 
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Port and polish: probably the worst bang-for-your-buck mod there is. It's a good thing to do on crappy old iron V8's with poorly shaped ports, but your 18R-G is a different story. It doesn't hurt if you want to clean up the casting dags yourself, but don't spend money getting someone else to do it.
Reground cams: almost certainly the best bang-for-your-buck mod for NA engines! Not as good as new billets, but a hell of a lot cheaper. Do it.
Shaved head: dodgy. The correct way to increase the compression ratio is to replace the pistons. Not cheap I know, but at least you won't screw up the cam timing.
LRP: why the hell are you running that crap? All 18R-G's have hardened valve seats, so valve seat recession is not an issue (hence leaded fuel is not necessary). Run it on premium unleaded, it will run great on that.
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Location:
Paralowie, Adelaide
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 08:45
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Hey Norbie, Cheers for that mate
I noirmally run a tank of premium, then during the week i put $10-20 worth of lrp....
Aaaah well, cams it is 
Cool
Ben
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Location:
Melbourne
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 09:08
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if you want to raise compression and your valves are dished just look for some flat faced items, GT told me that little trick shame that was after i had put my 5m head togther 
(18r-c valves in the 5m head would of worked it looked like... 5m needs all the extra compression it can get! 63rwkw 
Allan
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Location:
melbourne
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 11:19
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dont grind your cams as your base circle will in crease and your shim clearence will increase better to weld up and regrind ans shims will change say 20 thou
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Location:
Newcastle
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 11:51
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if you have to change your valve clearences you may aswell keep all the existing shims and have all the valves retipped as the shims a a total bitch to find
the only ones i could find in qld that would fit were old pugeot shims and they are rare toyota dont sell them and no one keeps them in stock. otherwise i got quoted $35 each for a custom thickness shim. but if you get a new cam and all the valve clearences arent big enough you can take the shims to be ground down.
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Location:
melbourne
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 12:01
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i have over 120 shims from 1.25 mm to 440 mm
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Location:
Flagstaff Hill, South Aus...
Registered:
May 2002
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Re: Help With 18RG Mods???
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Wed, 10 July 2002 15:23
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Don't use unleaded unless you know for sure that it is the slightly later 18rg with the updated heads (with the hardened valve seats. I am also running an 18RG, it is the earliest 18rg, withthe toyota head, so i use LRP, if you aren't sure of whether yours can use premium unleaded, then take it to a mechanic who works with the old toyota twin cams, he should be able to tell you.
For more information, go to http://www.toysport.com/Technical%20Information/2t g_18rg_3tg_tech_notes.htm
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Location:
Paralowie, Adelaide
Registered:
May 2002
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Re: Help With 18RG Mods???
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Thu, 11 July 2002 00:53
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INteresting reading that, Cheers
I was led to beleive by someone on a different forum, That the stock valves in 18RG heads, were the biggest you could go for? Is that true or can i go for Bigger valves?
Im still weighing up wether i would be better off waiting and doing an entire ground up rebuiild, Seems stupid to just do one half and leave the bottom end all stock......
Has anyone here got a 60thou overbore with wild head work yadda yadda??? What is a rwkw reading i could go for?? bearing in mind it will be carby'd, 60 thou, Still going the port and polish, maybe bigger valves if i can, Lumpier cams - might ave for billets.......And i guess a carby upgrade to webers or the like
Cheers for any help
Ben
PS: in case you hadnt yet noticed, im still kinda new to these engines, I owned a gemini for ages and didnt think id ever sell it, So i knew nothing about toyota engines, or any other engine for that matter
PPS: alan, My stock 18rg is only putting out just over 63rwkw, i was told it put out 64-65 on the dyno 
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