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Location:
Newcastle
Registered:
September 2002
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 Webers (+18-RG)
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Sun, 06 April 2003 13:25
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Just a few questions involving Weber Carbs.
DCOE.... I have looked but I can't find what it stands for.
Would a standard 18-RG(U?) be considered under cammed for twin 45's? If yes what does it do (see next question)
Would a properly tuned webers on an 18-RG make the exhaust choke with carbon (ie cover the tip of the exhaust after less then 100kms)?
Any problems like surging at high speed(>100km/hr)?
Is 6.7Km/L (15L/100km) about right for average country driving?
I have searched toymods and google but cannot find anything specifically about 18-RGs with twin webers, such as jet sizes.
I found the jetting.exe and it suggests 40 DCOE (not 45s),
Using 2000cc and 5500 max power rpm
Power Flex
Choke 34 32
Main 140 130
Emul F9/F16/F2 ditto
Air Cor 180 ditto
Idle 50f9 ditto
Pump 40 ditto
Aux Vent 4.5 ditto
Copyright Dave Andrews. http://members.aol.com/dvandrews/
I have to check to find what they changed mine to. What size jets does everyone else run?
....Or do I just need to find a place to tune them properly? 
Thanks.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 00:16
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i have my 18R-GU running twin 45mm webers without a problem. They are running rich as a bitch, but they still work a treat!
AS far as tuning it up goes, there is a guy here in sydney people call cranky frank - apparently the best guy for anything carbied.
If i were you, must get the 45's.. since stock the motors had 44mm solexs!
surging at speed - never
fuel consumption - high, can be better with tuning
exhaust carbon - not really a problem
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Location:
Brisbane
Registered:
May 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 01:37
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Uh, I'm pretty sure the standard carbs are 40mm. It seems unlikely that an engine rated at 130hp from the factory would have 44mm sidedraughts!
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Location:
Madrid - Spain
Registered:
August 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 03:56
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Your webbers should give you a lot better mileage than that. It sound like you need to find someone who knows how to tune multiple carbies.
My old man is a wiz with tuning them, served his trade on RT chargers and XU1 toranas. He did wonders for my 18R-G. But if the jets are all wrong, you might be better taking it to someone like Carburettor Services at Homebush. They are the guru's with multi carb set ups.
I think my Solexes were 40mm too, but that was a long time ago.
If the choke size is too big, the airflow through them will be too slow and the venturi (tube inside the throats) that atomises the fuel will not work properly. This means that instead of getting a mist of fuel it is getting a drizzle.
I havn't had a close look inside a webber but the solex's have a problem with the venturi's working loose, this really stuffs things up and would explain your symptomes. Take the filters off and stick your fingers down the throat and make sure nothing is loose.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 04:31
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im VERY certain that from the factory, 18R-G(U)'s were all fitted with 44 Solex's. I have taken a set off and measured the butterfly at 44mm just to be certain. Even so, just about every article that you read on 18R-G's says that they were fitted with the 44's. It was the 2T-G's that were fitted with 40's. Although im open to proof otherwise 
At the moment my fuel economy is up the shit, but that is due to the lack of tuning. Something around 350k per tank in city. up to 600k on the highway though!
Weber's are definitely worth getting on 18R-G's. They offer some beautiful noise, and add a little bit of reliability over the Solex's as far as rebuilding goes.
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Location:
Brisbane
Registered:
May 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 04:41
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I think you may be taking the wrong measurement... it's the size of the venturi, not the size of the butterfly, which determines the "size" of the carby. I could be wrong here (I don't claim to be an expert on carbs), but the figures I've always seen quoted for 2T-G and 18R-G carbs was 38mm and 40mm respectively.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Webers (+18-RG)
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Mon, 07 April 2003 04:46
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might be something worth further investigation then hey norb!! 
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Location:
Newcastle
Registered:
September 2002
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Re: Webers (+18-RG)
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Tue, 08 April 2003 11:59
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THE WITZL, are you running std cams?
From memory the fuel tank is about 60L? (Or was that for the RA60?).
Another thing that I have come across, what fuel do you run and what was it set up for? Mine is completely std, running lead replacement. Someone suggested running unleaded with flashlube but I have also heard things about 18-rgs cannot use unleaded even with the upper valve lube, what has everyone else found?
I think I will find someone that really knows what they are doing.
Thanks.
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Location:
Brisbane
Registered:
May 2002
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Re: Webers (+18-RG)
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Tue, 08 April 2003 13:03
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This has been covered in another thread, but in brief, 18R-G's do NOT need leaded fuel, lead replacement fuel, "flashlube" or any other fuel additives. Plain old unleaded is fine, unless you have an early high-compression engine which will be happier on premium unleaded.
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Location:
Canberra
Registered:
October 2002
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Location:
Brisbane
Registered:
May 2002
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Re: Webers (+18-RG)
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Wed, 09 April 2003 01:09
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My old 2T ran on regular unleaded all day every day without complaint, and I owned it for at least 3-4 years. Seriously, stay away from that LRP crap - it's just ULP with extra nasty stuff added. Your car will probably run better on ULP.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: Webers (+18-RG)
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Wed, 09 April 2003 15:36
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nope, my lovely little 18R-GU is at PERFECT STOCK condition - right down to the main bearing being at stock spec! (recent rebuild) so my cams are also stock.
I run my baby on NOTHING but optimax/similar fuel, simply for the octane and ping free revving. I will NOT ever use LRP again, seeing what it had done to my previous 18R-GU (it was messy!) was enough to put me off it.
Fuel tank is around 55-60L yes. only ever fill up with around 40-45L though.
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Location:
Adelaide
Registered:
June 2003
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Re: Webers (+18-RG)
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Tue, 10 June 2003 00:04
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I have heard that the lead replacement fuel is one of the worst on the market for your engine as it lacks lubricant properties.
One mechanic actually suggested using a mixture of premium and diesol for a long lasting engine.
I am not too sure about the validity of this suggestion and would appreciate any input.
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Location:
Brisbane
Registered:
May 2002
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Re: Webers (+18-RG)
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Tue, 10 June 2003 01:03
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Diesel in a petrol engine? LOL! Even a small amount would make your engine smokey as hell, and probably form carbon deposits in the combustion chambers.
Fuel does not require lubricant properties; that's what the oil is for. It's a common misconception that lead was used to lubricate the top end of the engine, but that's not strictly true. It was used to prevent valve seat recession, but that's not an issue when your engine has hardened valve seats. Pretty much all Toyota engines since the early 70's fall into this category.
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Location:
Sydney, Australia
Registered:
May 2002
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Re: Webers (+18-RG)
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Tue, 10 June 2003 02:02
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DCOE stands for Doppio Corpo Orizzontale (ie. double throat horizontal)
sam
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