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Location:
Melbourne
Registered:
October 2004
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Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Tue, 26 October 2004 15:06
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Does anybody out there have any info or knowledge about these carbs.. diagrams, settings, where to get carby kits etc. Can some-one in Melb. do a decent job on tuning - everybody's wrecked the settings.
Would they tune better if I used PULP? Would they be better if the manifold was unblocked and had water running through? How important is the fuel pump - some guy put on an 18R pump.. is it a different fuel delivery to the correct one?
The thing goes really well even with badly tuned carbs, but the only way I can get them to work reasonably well is by listening to the body with a stethoscope and then listen to the hiss via a tube from ear to the throats and then walking around the car listening to the exhaust and then looking at the tacho... (neighbours think it's really strange).
It needs to be hot to tune it properly, so I have to keep taking it on the road and stopping here and there to give it a tweak... it's crazy. They never used to be like this till mechanics fiddled with them. 
While I'm at it, how do I set that little thing that sticks out the back of the distributor... that octane thing. Also, is the vacuum advance that important, it seems to ping less without it connected.
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Location:
Adelaide
Registered:
September 2003
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Wed, 27 October 2004 07:12
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If Sean Moloney is still around, give him a call, and if he can't help, he may be able to point you in the right direction. Used to be located above IDB Automotive somewhere in Richmond.
He is a wiz with Toyota twin Cams, so wshould be able to help you with your rare beasty.
Where are some pics !!!
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Registered:
June 2003
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Wed, 27 October 2004 12:09
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The 8RB is a single cam.
Why not solve the carb problem and get more power in the bargain and drop in a 18RGE. A defacto GSS 
Pics would be great 
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Location:
Melbourne
Registered:
October 2004
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Wed, 27 October 2004 22:11
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Thanks guys... a good pic is here: http://www.toyotaoldies.de/markrt72.html
My Toyota is like this red one in Germany, but not as shiny.
I have since found out it is a 1970 model (Rego papers said 1st registered 1971).
Toyota put on various carbies throughout the range and mine are the last that they tried - therefore no documentation....bummer...
But, it seems they perfected the fuel delivery to the needs of the engine. I believe the carbies are great engineering but the design & settings are awkward for the end user to work with.
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Wed, 27 October 2004 22:25
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If you are in the east of Melbourne, you could consider taking it to Hillway dyno up in Kilsyth - they have played with various SU carbed Toyotas.
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Location:
Melbourne
Registered:
October 2004
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Wed, 27 October 2004 22:38
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Update: - someone left a core plug in the block. It's been removed as well as the SLUDGE that gathered around it. Back cylinder had no cooling. Manifold is nearly unblocked... maybe it will fix carby cooling/tuning problem...very exciting!!.. maybe carbs will be OK with problems fixed because it never used to be like this.
Re: Maloney ... I will track him down and chat...I'm near Richmond.
Re: new engine.. I really love this one.. it puts up with all sorts of stuff and still keeps performing ...
I owe it to the engine and the car to give it a good environment to live in.
This car is fantastic - I've had this car since it was 6 years old and now it's about it's 34 years old. It lived outside in the weather for about 28 of it's years, and was left unused (by me) for about 12 of those years whilst I lived in Perth - I didn't want to get rid of it.
The paint is RS, but considering all the above, it has really stood up to abuse... and red paint is the worst - new cars just wouldn't cut it. There's no rust but a couple of areas where the trims catch debris that rots.
I love this thing.
My friend Brad, down the street is working on it. He's 23 y.o. and halfway through his apprenticeship. He has an afinity with cars, takes his time and is dedicated to the outcome and also is in love with 'old' cars.
He has a mint Adolph/Eva type old Merc and a mint canary yellow Torana and a little 'tree-frog' green 323 Mazda wagon which he built from the ground up. They are all little snapshots of history.
So guys, If you want some love & attention given to your car in Melbourne, I'll give you his mobile.
The BONUS - his jobs end up costing about a half to a third of the price of traditional means, PLUS all the little things get done with love. He becomes personally involved and committed and sees your car as a living thing and as a 'project' not just a means to earning money.
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Location:
Canberra, ACT
Registered:
September 2002
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Thu, 28 October 2004 09:05
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if they're anything like real SU carbs, go to your local library and find a copy of Des Hammil's "How to build and powertune SU carburettors". Is good book. His other books seem pretty good, too. Worth a read.
I've got it on loan from my library currently... preparing to bolt on a pair of SU HS4s on my 3K motor.
The major issue with SU carbs is getting the needle profile right. I would really hope that these mechanics haven't reprofiled the needles, as doing so is irreversible; it involves removing tiny amounts of metal from particular areas along the needle shaft.
If the needles have indeed been fiddled with, you'll need to try to find an original set, or at least find out what the specifications were. Good bloody luck, I say.
Typically, all SU carbs of a given model have the same jet, at least from the factory. They may have been changed, of course.
"SD Car Tuning" in Braddon, Canberra are a carby specialist, and can get a huge variety of carbs and carb bits, including SU. You might want to give them a call.
[Updated on: Thu, 28 October 2004 09:06]
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I supported Toymods
Location:
I renounced punctuation
Registered:
May 2002
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Thu, 28 October 2004 11:05
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Wilson Carbs in Carlton have a large range of SU needles available. Not sure what diameter the jets in your 8R Aisans are but measure them when they are next apart. Make sure your carbs are balanced and in good working order with no air leaks at the throttle shafts.
Pop your car on the dyno with gas analyser up its bum and see where it is rich or lean. Select a needle with an appropriate profile that will correct this.
As indigoid pointed out, hopefully the original needles have not been reprofiled. It is possible to have your needles profiled. The needles from Wilsons are about $12 each. Of course they will only have the original SU needles (not the Jap ones).
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Location:
1st street on the right
Registered:
November 2002
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Thu, 28 October 2004 20:25
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If they don't pan out try these guys in sydney.
http://www.sumidel.com/default.htm
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Location:
Canberra, ACT
Registered:
September 2002
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Re: Dual Aisans side draft on 1971 Corona Mk11 coupe RT72 with 8RB
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Fri, 29 October 2004 11:06
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ooh, they sound alright, thanks for the tip!
*bookmarks*
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