Outer Limits 4x4 Board

does anyone know that formula for the maximum allowable size moter in any given car in regards to cubic inches vs size of car????

I am sure the rules on this changed a little while ago and there was a certain formula you could use to work it out.


Anyone?

Didn't know there was a formula. Cos there's a mob in QLD somewhere putting lexus V8's in MX-5's. So thats 2lt 4cyl to 4.7V8.

turps wrote:Didn't know there was a formula. Cos there's a mob in QLD somewhere putting lexus V8's in MX-5's. So thats 2lt 4cyl to 4.7V8.

the bullet is a remanufacured vehicle, not a mazda mx5 anymore.

Also they are built just across the border in NSW not QLD.

And the 1uzfe is 4.0 not 4.7

what about the bloke who put a rolls royce airplane engine in his 57 chev (or whatever it was)?

55 chev

Well, fatass75, your thread has pretty much been grabbed, thrown to the floor, and shot in the back of the head, hasn't it?

Talk about being shot down.
Well I'm not posting anymore, I dont like being yelled at. Your all a bunch of meanies.

fatass75 wrote:does anyone know that formula for the maximum allowable size moter in any given car in regards to cubic inches vs size of car????

We have this sort of formula in Victoria - but it only affects P Platers. I'm not aware of a definate ruling for a car vs engine size.

The P plate formula can probably be found on the Vicroads website and is basically:

(Engine Capacity in Litres / weight of car) must be less than X

and

(Engine Power in KW / weight of car) must be less than Y

Or something like that.

In a car with a separate chassis ( ladder frame or whatever), u can stick whatever size motor in it u want! thats the ruling in NSW, and i know QLD is not alot different...

Phill

OK the basic formula is based on weight. ie

Mon chassis the factor is 2.5

Car = 1000kg you can fot a 2.5lt non turbo engine

separate chassis the factor is about 4.0

car = 1000kg you can fit a 4.0lt non turbo engine.

For Queensland there is also a list of common conversion that are pre approved. I have a list somewhere if I can find it I will make a copy and post it.

Cheers
Paul

on the NSW RTA website there is a calculationt hat you can preform. not sure in other states though

yeah for the vic P platers formula its 3.5L per 1000kgs, and 125kw per 1000kgs.

i swear my car weighs 2400kgs.

MaccA

In QLD you can approve an engine under what they call "option 3". This has a calculation table that come out like

4 cylinder vehicle and rotaries with a weight under 1000kg
Max non turbo engine (cc) = weight of car(kg) x 3
Max turbo engine (cc) = weight of car(kg) x 2.5

4 cylinder vehicles and rotaries over 100kg and all 6, 8 & 12 cylinders
Mono constructed
Max non turbo engine (cc) = weight of car(kg) x 4.82
Max turbo engine (cc) = weight of car(kg) x 4.0
Separate chassis
Max non turbo engine (cc) = weight of car(kg) x 5.46
Max turbo engine (cc) = weight of car(kg) x 4.68

Where I have written 'turbo' you can substitue with 'super'

Conversion done under option 3 also require checking of some other stuff. Brake type/glass/wipers.

This limits are all great but only apply to passenger cars and passenger car derivatives. It specifically says (Note 2.3.1.2) that you can't use this table for commercial vehicles or four wheel drive vehicles. If you are on this forum I take it you want to know about what you can put in something 4x4.

That basically puts you back to using "option 2" which is a table to prevously accepted engine for your particular make/model, or putting in a individual application to modify.

There is a bit more to it all but that's the guts of it.

CRUSHU wrote:

turps wrote:Didn't know there was a formula. Cos there's a mob in QLD somewhere putting lexus V8's in MX-5's. So thats 2lt 4cyl to 4.7V8.

the bullet is a remanufacured vehicle, not a mazda mx5 anymore.

The bullets were done under a scheme called "Ultra Low Production" which is handled at a Federal level instead of a state level. Basically mean no modification codes, just meeting the ADR's, but lots more cost/testing and complexity of approval.

http://rvcs-prodweb.dot.gov.au/perl/297 ... 163019.cmd

I know in NSW there is a page on the RTAs website.

but the 4x4s get the raw end of the shaft as usual.

but its on there do a search.
i will post addy when im next at work.

ok ok so i work for the RTA blow me!

............................................... i feel so sorry for you guys......

i'm just glad i'm an american.... i can do whatever i want to my rig and its legal!

What I should have maybe asked is what is the biggest motor I could put into a gq without a headache from DOT in QLD

Appreciate the info though

fatass75 wrote:What I should have maybe asked is what is the biggest motor I could put into a gq without a headache from DOT in QLD

Appreciate the info though

The Guy with the commadore ute body on a MQ chassis, specifically chose the MQ as he could leagally slot a 454 into it without to many engineering issues .. So a 454 is 8 litres or so isnt it ?? So around 8 liters should be enough to move you shouldn't it

What are the year model ranges for the MQ and GQ. Sorry, not real familiar with the Patrols.

The larges engine I can see is a 5800 cc

love_mud wrote:

fatass75 wrote:What I should have maybe asked is what is the biggest motor I could put into a gq without a headache from DOT in QLD

Appreciate the info though

The Guy with the commadore ute body on a MQ chassis, specifically chose the MQ as he could leagally slot a 454 into it without to many engineering issues .. So a 454 is 8 litres or so isnt it ?? So around 8 liters should be enough to move you shouldn't it

454 = 7.4litres
502 = 8.2 litres

dream = 705 = 11.6+ (yes can be done in a 'tall' deck block in a street car)

also if you wanna be dodgy, you could get a keith black small block chev. get maximum bore and stroke (equals 454cu in). then just say its a 350.

MaccA

love_mud wrote:The Guy with the commadore ute body on a MQ chassis, specifically chose the MQ as he could leagally slot a 454 into it without to many engineering issues .. So a 454 is 8 litres or so isnt it ?? So around 8 liters should be enough to move you shouldn't it

Are you talking about the Yellow one that was in 4WD monthly a while back?

THE only other small restriction you have is that the engine must be least of age of the vehicle's build date if it is to run on its original fuel base.

So a 90 cruiser must have a 90+ model engine fitted.. If any other engine is fitted prior to the build build date it is expected to run on gas. Diesel of course is the only exception to the rule. Diesel engine replacments are still subject to cubic and mass/power restrictions as well.

Another nice way to throw a spanner in the works

turps wrote:Didn't know there was a formula. Cos there's a mob in QLD somewhere putting lexus V8's in MX-5's. So thats 2lt 4cyl to 4.7V8.

All the V8s they install are 4.0L

The 4.7L has a cast block and is only available in australia in the Lexus 4WD and is worth big bickies.

The 2UZFE in the states is an all alloy 4.7L but is a long time from reaching our shores in a production vehicle.

RUFF wrote:

love_mud wrote:The Guy with the commadore ute body on a MQ chassis, specifically chose the MQ as he could leagally slot a 454 into it without to many engineering issues .. So a 454 is 8 litres or so isnt it ?? So around 8 liters should be enough to move you shouldn't it

Are you talking about the Yellow one that was in 4WD monthly a while back?

Yep thats the one ..

love_mud wrote:

RUFF wrote:Are you talking about the Yellow one that was in 4WD monthly a while back?

Yep thats the one ..

Where did you hear he used an MQ Chassie and that he only used that so he could fit a Big Block into it?

Bullet at Yatala in QLD, have a 2wd petrol single cab hilux with a lexus v8 in it, mod plated & registered on road for their daily driver. They have told me that it is no problem to fit one to my 4wd hilux. (At a price of course)

If the rules are the same as nsw ,
there is a note at the bottom of the of the equation table
stating.
THe above limits do not apply to 4wds ,light trucks ,,buses up to 4.5 tonne.