| [ Total Views: 2602 | Total Replies: 20 | Thread Id: 382 ] |
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 matara
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 posted on August 29th, 2002 at 06:22 PM |
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12A Mazda Rotary Conversion
I've just read a web page on a Mazda rotary conversion for a beetle. http://www.geocities.com/zenjoe/VW.html
Reading this article has inspired me to possible have a go myself! Ive found out that a conversion kit for a 12A is approx $450, a used 12A rotary
ranges from about $800 to $2500, and you would need a carby (already got a DRLA 45), and a custom made exhaust!
Has anyone got any experience of this conversion. Also does anyone know whats involved in getting an engine conversion passed in NSW? I guess you need
an engineers report etc, but there are so many old Mazda's getting 13B's etc surely it must be possible.
Thanks
Steve M :thumb
[Edited on 5-9-2002 by Baja Wes]
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Baja Wes
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| posted on August 29th, 2002 at 06:36 PM |
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Steve,
Legally speaking the 12A is considered a 2400cc. They multiply the size by 2 for rotaries. To legally use a naturally aspirated 2.4L engine your car
needs to weigh 800kg+. This should be relatively easy to prove. There are many respectable books that say weights of 800+. My rego papers say my car
weighs 920kg.
Good luck with the conversion by the way. Just use a nice muffler and keep it a little quiet to get the suprise attack working 
[Edited on 29-8-2002 by Baja Wes]
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Che Castro
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| posted on August 29th, 2002 at 07:09 PM |
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i think wayne penrose did one a while back. i have the issue of Performance Volkswagens or something like that which has the article
Jon
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Baja Wes
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| posted on August 29th, 2002 at 07:18 PM |
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yeah a pink one with a matching trailer.
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MR930
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| posted on August 29th, 2002 at 07:58 PM |
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I've got a conversion kit for a 12A and will sell it cheap if you want it. I think I have some extractors here somewhere too . Mark
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70AutoStik
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| posted on September 2nd, 2002 at 09:07 PM |
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You will need an engineer's certificate to get it registered. I read in a recent (non-VW) mag that NSW has the same self-certification limit as
W.A. - up to 25% increase in capacity. If you want to have it road registered, I'd speak to an engineer and calculate the real costs before
going too far - it will probably require some pretty major mods to make it legal. Anyway, what have you got against air-cooled? Not cool enough?
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1303Steve
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| posted on September 2nd, 2002 at 09:53 PM |
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Visit the RTA website http://www.rta.nsw.gov.au for more info and talk to an
approved engineer
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 kombi_kid
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| posted on September 3rd, 2002 at 08:12 AM |
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there was a kombi with a 12A rotary in it for sale in the trading post 
anyway what sought of boost will it give you?
cheers
rhys |
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Baja Wes
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| posted on September 3rd, 2002 at 12:45 PM |
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The self certification limit is actually 15%. Check this link for more details
http://www.rta.nsw.gov.au/registration/vsi06.pdf
Take note of the safety upgrades required for such a conversion.
So you legally have to get a 1915 vw motor blue plated, cos it is 20.8% bigger than standard. My 1915 is blue plated.
Rhys, you won't get any boost unless it's turbo-charged :P
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kombi_kid
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| posted on September 3rd, 2002 at 08:44 PM |
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what does a "rotary" do for you then?
cheers
rhys |
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70AutoStik
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| posted on September 3rd, 2002 at 09:27 PM |
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The Wankel Rotary Engine (built by Mazda under licence from VW, who hold the patents, but have never produced one!) is a two cycle rotary engine.
Instead of pistons, it has roughly triangular rotors which spin around an epicylclic gear onto the drive shaft. They were popular for their power
output and their ability to rev high (allowing higher top speeds without changing the diff ratio.)
Hope that helps a little.
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type82e
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 posted on September 3rd, 2002 at 09:46 PM |
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a rotary is a different type of engine rhys it has no valves like normal engines its more like a 2 stroke engine as it uses ports instead of valves.
they rev like crazy up to 10,000 rpm use lots of petrol
one thing to pay special attention to is cooling I bought a 68 bug that had run a 12 a and the guy had no end of trouble trying to keep it cool
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matara
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| posted on September 4th, 2002 at 01:23 AM |
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Here's what they look like
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kombi_kid
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| posted on September 4th, 2002 at 08:09 AM |
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oh alright kool! thanks for explaining it guys!
cheers
rhys |
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twobus
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| posted on September 4th, 2002 at 09:04 AM |
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rotary conversion
I have a mazda truck with a 13b extended port in it and I can say from experience that cooling is DEFINATELY, the major problem,I have to run a
radiator with a 4 core for a statesman, plus two electric fans, also you could run into problems with the centreline to sump dimension , the rotary
may hang a bit lower.
The next thing is that they are NOT 2 cycle as previously stated by autosilk they run the full four stroke cycle it just takes place within 2/3
rotation of the eccentric shaft or (crank) |
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70AutoStik
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| posted on September 4th, 2002 at 08:54 PM |
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Thanks for the correction.
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Speedbuggy
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| posted on September 4th, 2002 at 10:27 PM |
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YA All BLOW SMOKE(RE: ENG CONVERTIONS)
IMAGE IS OF DUNE BUGGY WITH ROVER/BUICK P76 3.5LT ALLOY V8(stockton weekend)
EVEN WITH A WHEEL BASE TWICE THE LENGTH OF A BUG, AND 56'LONG IRS ARMS THE THING WOULD LIFT THE FRONT END UP,
HOW LONG DO YOU EXPECT THAT BEATLE TRANAXLE TO HOLD UP WITH NON VW ENG, YOU WILL HAVE TO PUT A BUS TRAN IN LIKE I HAD TO DO..COST$$$ COST.. THERE NEW
BOX MOUNTS AND CUSTOM AXLES....
YOU SHOULD TALK TO BILL CROFT AT UNI-CAP (SYDNEY) COMPANY THAT MAKE ENG ADAPTER FOR VW BUGGYS, THERE IS NOT A ENG HE HAS NOT CONVERTED BEFORE....BUT
THEY ARE EXPENSIVE....
I HAVE A "L- MODEL" DATSAN/NISSAN PLATE, ENG ARE CHEAP WITH A REBILT 100HP 2LT OHC WITH TWIN SIDE DRAFT WEBBERS COSTING $300, PLATE AND
FLYWHEELE COSTING $100, THROUGH IN A RADATOR BOB YA UNCLE YOU HAVE A VERRY PUNCHY WATER COOLED ENG THAT DOSNT WEIGH MUCH MORE THAN A VW AND IS NO
LONGER THAN YA REAR TAILLIGHTS
PS-THE ROTOR IS THE BEST OPTION THEY ARE AS HEAVY AS 2/10THS OF f*** ALL..WAWWAWWAWAWAWAWAWAWW(MATE HAS RX2)AWWAWWAWAWAWAWAWR
[Edited on 4-9-2002 by Speedbuggy]
[Edited on 4-9-2002 by Speedbuggy]
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SKEWtYpe3
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| posted on September 5th, 2002 at 12:01 AM |
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just as i am starting to understand VW engines you go and do this, and talk about triangular rotors and epileptic cycles. You just did my head in
!
:P
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Baja Wes
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| posted on September 5th, 2002 at 10:38 AM |
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Nathan, as you know I was there at stockton, I saw that buggy, and I definitely didn't see it lift its front wheels. Even when he gave it full
throttle half way up a steep dune and threw sand everywhere it was stable and didn't lift the front.
Oh, and I have a modified Bus trans with custom axles, mounts and Bus CV's. So I'm ok then :P
PS: I know your supasports didn't have a bus trans, so what car of yours does?
[Edited on 5-9-2002 by Baja Wes]
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Speedbuggy
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| posted on September 7th, 2002 at 07:50 PM |
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Sorry wes
MATE YA BAJAS SWEET....
I SEE HEAP OF CONVERTIONS, MAZ, HOLDENS, BMW, EVEN VOLVOS...
I HAVE FRIENDS WITH SR20DET'S AND THE EJ20'S IN RAILS
I SCAPED A BAJA (BODY AND PAN WAS STUFFED)THAT HAD THE PLATE AND BOX, AXLES, CVS, BIG REAR DISKS IM PLANING TO BUILD A RAIL SOON..
THE STOCKTON DUNE BUGGY CLUB HAD A RUN AT THE NEWCASTLE MOTOR DROME, ITS A CLAY OVAL TRACK, STANDING START, THE LGHT WENT GREEN, 9 OUT OF 10 CARS
LIFED THE FRONT WHEELS INCLUDING OUR FRIEND THAT WAS AT STOCKTON..
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Monsterbus
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| posted on September 9th, 2002 at 11:26 AM |
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I'd like to add a few comments to Speedbuggys. First up the P76 is 4.4lt not 3.5, the early Range Rovers ran 3.5 then went to 3.9 and then
bigger. So is it a Rover 3.5, Buick 3.5 (Old Skylark engine) or Leyland 4.4 Anyway, I'm just getting picky. The Bus tranny will last in a bug no problem and is mounting really that much of a pain heaps of the guys
have done it now. As for lifting wheels, my Camper would lift the front wheels with a 230hp P76 motor and 1600 bus transaxle but not with the 2.0lt
box and defiantley not with the Albins Box as the ratios were taller still, the lift was changing hard from 1st to 2nd across the crown of the road at
intersections. A P76 engine in a bug with a standard 1600 bus box should easily pick up the front although maybe with less weight it will just
accelerate and not lift!!
Cheers
Steve
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twobus
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| posted on September 9th, 2002 at 07:49 PM |
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I always thought the leyland Terrier truck had the 4.4 alloy v8 and the P76 had a 4 litre! |
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KruizinKombi
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| posted on September 9th, 2002 at 09:55 PM |
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P76 Engine
Monsterbus Steve is correct on this one, we had a P76 until it got written off by a KOMBI!!! :o
Kruizin Kol
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twobus
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| posted on September 10th, 2002 at 09:40 AM |
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So the p76 had the same size engine as the terrier truck!
cheers |
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