OK, since this seems to come up every second day with everyone wanting to put a 13BT in the RX3 they lie awake dreaming of buying, I thought it was worth making a thread that could go in the reference archive. I'll start with what has been covered for NSW and leave the other states for others to fill in.
So, from the Light Vehicle Modification guidelines
http://www.rta.nsw.gov.au/registration/ ... /vsi06.pdf
Maximum engine sizes:
For any car, the maximum allowable increase that does not require engineering is 15% above the maximum size engine
available for the vehicle. So, e.g. my RX2 just gets away with a NA 13B without engo
having come out with a 12A.
For any other conversion for anything other than an Independently Constructed Vehicle (see RTA link, I'm not going into it here), it is based on the OEM tare weight according to the RTA, not weighbridge weight especially not when it's done with a couple of chunks of depleted Uranium chucked in the back.
according to the table below
and this, taken from http://www.alphalink.com.au/~hillsk/maxcap.htm
Sorry, no S2 or 3 RX7 TW. Someone else casn post them up.
And the RTA considers a rotary capacity to be 2x it's swept volume.
So for the most common rotary conversions:
20B NA: 3924cc equivalent, anything over 1308kg
20BT or supercharged, 1570kg minimum
13B NA: 2616cc, 872kg min
13BT/SC: 1046kg min
12A NA: 2292cc, 764kg min
12AT/SC: 917kg min
From the table above you can work out whether what you want to do is legal in NSW. You may be able to do these conversions and then find Cousin Tony The Certified Engineer to sign them off, but it will still be illegal, engineering certificate or not. This has implications mainly for insurance. KYPREO has dealt with these issues so I have pasted his comments here, from this thread:
A lot of the has been answered before, and you will find more info by searching, but I'll spell out a few things.
ok say u get a 13bt in a 1300 engineered with all brakes, suspension, driveline etc done with the conversion done properly. Obviously tho, the rta rule says this conversion is still a no-no, but u are able to get it engineered.
An engineer can only sign off on modifications where the statute or regulations specify an engineer can sign off.
Engineers aren't members of parliament, nor are they part of the public service administering the law, so they have no ability to legalise something that is not legal. They can only fulfil functions conferred on them by others.
In NSW, the regulations specify capacity/weight ratios within which you can legally register a passenger vehicle.
Outside these ratios, you must certify the car as an Individually Constructed Vehicle (or ICV). Information on this can be found by searching using the term 'icv'.
now, you are driving down the street and u have an accident. Is your insurance cover still void (you have told them all the modifications), or can they say it isnt legal (what about the certificate?) and refuse to pay up???
your insurance is void, as it was fraudulently obtained. there are also standard terms used in contracts of insurance which indemnify the company where the vehicle was not legally registered. This is a right the insurance company would have to assert - its not void until they void it, is what I'm saying here.
wat about CTP...you are covered under that no matter wat arent you (even tho the car is illegal)?
Because you have paid the compulsory premium as part of your registration, you are still covered for no fault compulsory third party injury insurance. Obviously it would be illogical to have such a scheme if victims were denied money whenever someone broke the law and caused them injuries.
So basically a certificate means nothing?
no. people misunderstand what a certificate means. It is not a certificate specifying that something is legal. It is a certificate certifying modifications comply with particular standards, where the law requires those standards be certified by an engineer.
Unfortunately you live in the state with the most draconian car laws in the country. Perhaps you should move to Melbourne where its much nicer all round and girls are better looking.
NOTE: this info above is for NSW only and may differ elsewhere
At the end of the day, if you have a 20B RX3 or 13BT R100 or whatever, certified before the current laws, you're a lucky bastard and we all hate you
. If you want to do the conversion now it'll be illegal, like most other fun in this state, and no amount of dodgy engineering certificates or grinding numbers off will alter that. If you do it, I guess you better hope you never have to make an insurance claim.
Or buy one of my mate's vast collection of half-converted project Mazda 121s instead