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Location:
Geelong, Vic
Registered:
June 2004
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 18r-c unleaded conversin
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Tue, 13 July 2004 11:33
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ppl have told me that running unleaded in my 79' 18r would compleatly nakker the valves, is this true. what might i need to replace to be able to run unleaded without hastles, secondly where could i pick up a ford webber and a bracket to fit onto the 18r-c
any help would be great
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 11:44
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The 18R-C runs perfectly on unleaded already.
It wont damage the valves.
As for a Ford Weber (i assume you mean the 34ADM), go to your local u-pull-it.
You can then pick one up for ~$40.
For an adapter, youll need to talk to carb repair type shops.
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Location:
Rocklea qld
Registered:
February 2003
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 11:54
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ive always ran mine on unleaded. Apparently when the engines are overseas thats the only fuel they have so it has to run on unleaded. Not sure if its true though
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 11:57
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i know it's not an 18R, but the K series motors are ok for unleaded all the way back to 1967.
afaik, all toyota alloy heads, with valve seat inserts are ok for unleaded.
Cya, Stewart
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Location:
Tassie
Registered:
October 2003
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 11:58
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u should prolly use flash lube tho . u can get this box thing installed 4 like $80 that add it 2 the petrol it's self or u can add it when u fill up it's like 10mls to every 10 litres i think
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 12:09
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sounds a littel gimmicky  ... i've run my K heads for 8 or 9 years on PULP and all good so far..
has anyone with an 18R actually had valve seat recession from lack of lube (not from hammering them)???
the main valve seats that have problems are those in cast iron heads, as they often do not have a seat insert, and the cast iron is what wears away. the hardened toyota seats should be ok.
also fwiw, 'lead free' petrol (or lead replacement) still DOES have metal in it.. i believe it's manganese and maybe another one (according to Shell australia) so there is still some valve cushioning effect, and is not suitable for cars with cats or O2 sensors...
Cya, Stewart
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Location:
Geelong, Vic
Registered:
June 2004
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 12:27
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thanx
what about forced induction, turbo is out of the question because there just isnt enough room, so that only really leaves supercharging, what would be a suitable supercharger, and what other than piping and bracket will i need to do to the engine
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Location:
melb
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 13:56
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is this a corona,?
dont mean to be harsh but if it were my car I wouldnt spend a cent on this P.O.S - sorry!
if its a celica, I may consider keeping it, but only if it were in mint cond..
just my 2cents
if you want a reliable cheap runaround by something more modern like a ae82 or if it has to be rwd then a ae71 - this at least has potential..
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Location:
Brisbane
Registered:
February 2003
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 14:05
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if you really want to extract significant power out of the 18RC - get a different engine... trust me ... this is familiar territory 
even if you avoided turbo (all that heat so close to the inlet), you're looking at custom mounting and manifold and piping for the S/C, custom pulley for the crank, probably custom pulleys for the water and alternator as well if you set the S/C pulley closest to the block.
then... fueling - needs major improvement; ignition - needs some kind of boost retard; cooling - at least the heavy duty radiator; camshaft - usable, but you probably want a better breathing profile to suit non-turbo boosting.
But the engine will need the compression lowered, and the only safe way is to machine out the head (combustion chamber) - and that probably means practicing a few times on a dud head first - or paying your machine/engineer to do that for you. The cheap option is a decompression plate and two head gaskets, but that will probably make detonation/pinging worse, will only hold up to about 5psi and gaskets will prematurely fail or leak.
Get a newer engine or just stick the webber on until you can afford a better engine (18RG, 2/3T, 3S etc)...
[Updated on: Tue, 13 July 2004 14:06]
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Registered:
March 2004
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 20:10
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RC already had hardened valve seats
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Tue, 13 July 2004 23:59
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| Mookie wrote on Tue, 13 July 2004 19:58 |
u should prolly use flash lube tho . u can get this box thing installed 4 like $80 that add it 2 the petrol it's self or u can add it when u fill up it's like 10mls to every 10 litres i think
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Its not an old-school V8 dude. Japan was using unleaded fuel a long time ago and most engines including the 18R-C were made to run on it.
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Location:
Adelaide
Registered:
September 2003
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Re: 18r-c unleaded conversin
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Wed, 14 July 2004 05:17
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What so I can use regular unleaded rather than LRP... Previous owner told me that i had to use LRP and its been costing me 10c a litre more on petrol.
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Location:
Brisbane
Registered:
February 2003
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Location:
Rocky Mountains, Canada
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Wed, 14 July 2004 05:55
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| sjsaman wrote on Wed, 14 July 2004 14:47 |
What so I can use regular unleaded rather than LRP...
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Did you read any of the above?
Yes... run unleaded.
It may ping a little... if it does, just back off the ign timing a bit.
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I Supported Toymods
Location:
Tamworth NSW
Registered:
December 2003
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Re: 18r-c unleaded conversin
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Thu, 15 July 2004 04:01
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ive been running unleaded in my 78 rona 18r-c and ive never seen a problem with it, same goes with my 75 rolla ran unleaded in it and never had a problem
Trent
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Location:
Crapberra
Registered:
September 2003
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Location:
Brisbane
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Thu, 15 July 2004 06:17
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1. Pre-86 cars are not required to run a catalytic converter, regardless of the fuel they run.
2. When you consider the size of the Australian market (tiny) and the realities of mass production, it's extremely unlikely Toyota would have done a special run of 18R-C's just for us which lack hardened valve seats. The engine will run fine with or without lead, so what's the point?
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Location:
ballarat
Registered:
April 2003
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Re: 18r-c unleaded conversin
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Thu, 15 July 2004 08:23
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i think the carbie you are talking about is the weber 32/36 dgv (or dgav which is the same but with water temp controlled choke)
they came from the factory on some cortinas
using a $40 adapter plate (from redline i think) you can bolt it straight on the 18rc inlet manifold
i know, cause its what i have on mine at the moment (soon to be replaced by 2 x dhla's muhahaha  )
cheers
evan
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Location:
Ipswich
Registered:
January 2004
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Re: 18r-c unleaded conversin
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Fri, 16 July 2004 00:21
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Hey guys,
I was just wondering about the standard 2T thats in a 75 TA22, would that be able to run preumiun unleaded ok? Do they run a cast head or alloy head?
And if not can you put premium unleaded and then put additives like Morey's Upper cyclinder lube etc?
Thanks.
Floppy
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Location:
Brisbane
Registered:
May 2002
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Re: 18r-c unleaded conversin
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Fri, 16 July 2004 01:26
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2T's have alloy heads and they will run quite happily on unleaded fuel. I always ran mine on regular unleaded, no problems whatsoever after many years of abuse.
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Location:
Ipswich
Registered:
January 2004
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Re: 18r-c unleaded conversin
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Sat, 17 July 2004 13:28
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Thanks for the info. To be honest shows how close I have looked the poor old 2T head 
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Location:
brisbane
Registered:
March 2003
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Re: 18r-c unleaded conversin
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Sun, 18 July 2004 12:27
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with the 34adm webber you will need to jet it down.. i used one of these on my old 18rc and it ran well with a port job and mild cam:)
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