Changing engine numbers

[Bart]

hey guys this question may have an illegal tone to it so it may be deleted by the moderators (hope not) but i need to ask it, the maximum allowable capacity turbo charged engine i can put into my LJ is 4.4lts but the one i want to use is 4.5lts, yep screwed by .1ltr life sucks sometimes, but there is another version of this engine which is 4.1lts but its head/port design isnt anywhere near as good as the 4.5ltr version. Soooooooooo what i was thinking was changing the 4.5ltr number on the block to 4.1ltr with a bit of welding and filling and number punching, has anybody done this before?? and is it as easy to do as it seems?? Any advise besides using a holden engine or GET A LIFE. By the way the engine is a Nissan V8, yes i know iv been going on about this engine for ages but the time is coming near to bite the bullet and shoehorn the bastard in the LJ excuse my language.

[maxnix]

VH45DE and VH41DE are really quite different internally.

I would look at new crank connecting rods (may not be able to use VH41DE parts - result would be about 4L) to achieve your goals with a VH45DE.

Or change the rules.

[EZcheese15]

If somebody could translate this into some type of readible English, I'd appreciate it. I'd help you out but I can't quite follow what you said. Try using some punctuation next time

[PalmerWMD]

Torry:

His local regulation wont allow him to use a 4.5L engine turbo'ed into his car.BUt only up to 4.4

He wnats to use the VH45DE and is womndering if its possible to affix the VH41de plaque ("4.1L V8") to a VH45de

Fred...

[Q45tech]

The 4.5 is not a 4.5 it is a 4494cc why Nissan chose lower to beat Japan regs [taxes on 4,500 cc and above].........depends on rounding in local regs.

Unfortunately to lower CR for turboing you will need dished pistons which will increase displacement.

Destroking rods and redesigned crank [don't believe the 4.1 will fit]........don't consider any of Nissan newer engines for turboing, not robust enough without cylinder liners.

[Bart]

PalmerWMD you are spot on, exactly what i mean,sorry for the long delay, i was thinking of milling off the VH45 number and somehow replace it with VH41, is the number stamped on or cast on?? i havnt had the opportunity to experiment with one of these engines yet.I need to know this stuff before i buy one so i know where i stand in terms of wheather i can turbo or not because in New South Wales Australia the d!ck weed government has put restrictions on capacity to car weight, my car weighs 1060kg which is 2336.9 lb, this means i can actually go 4.1liter turbo, or 5.3liter non turbo not 4.4liter nor 4.5 liter turbo. Its a really ****y rule but i cant get away from it, basically i have to fool the automotive engineer and motor registery.In the motor registery opinion the reason for this rule is so one cant have too much power, but its a stupid rule because if one wanted to you could get 600hp out of a 2liter turbo or 600hp out of a 4.5liter turbo, infact a 600hp 4.5liter turbo would be safer to drive and more predictable with a flatter power curve.

[DAEDALUS]

The casting number is stamped on, and pretty shallow. How would the government know what size engine it is? The stamping isn't readily visible on the full-up engine, since it's at the top back of the motor, just in front of the transmission interface.

How much weight would you have to (temporarily) add to the car to be allowed a 4.5L motor?

[Q45tech]

Not really appropriate to even discuss commiting a crime in this country or another.............wouldn't a picture of the two engines get you caught, they are that different looking.......oil pan, block webbing, starter on different sides, intake and plenum, valve covers internal vs external ignition coils.

[Bart]

Yeah i know what you mean with increasing weight but they go off the factory car weight.Part of the rules is to get a modified car checked over by a govnt recognised automotive engineer and they check the model/capacity of the engine and calculate the capacity to weight ratio. Weight being from manufacturer.But the car will be a little heavier because im going to add subframe connectors and rails, steel roll cage which will be welded in. But the extra weight wont be recognised when they calculate the capacity to weight ratio unfortunatly.

[PalmerWMD]

Also like Dennis said:The VH45de is 4.494 Liters!

So it is ok, as I wouldnt think that they be allowed to round up.Gov regulations all over the world, go by exact cc and dont round.

Double check with a knowledgable DMV guy, that a VH45de is ok, but I think you can just leave it say VH45de.

Even If you put in diferent type pistons that slightly increase to displacement over that magical number no one would be the wiser extrenally.

Fred..

PS: We would never think of deleting the thread just cuz an Enthusiast wnats to wiggle a bit with Gov Regs..

[Bart]

I doubt any autoengineer would know as this motor is not as common here as it is in the U.S.A, so i could almost call it a VQ35 and he would probably beleive it, VH41 and VH45 sounds close. And look similar enough as they're both V8 quade cam Nissan.If i had to go to extreme i could do a custom manifold or cam covers and say it looks a little different because i have modified it. Having said all that i guess i do have a fear that if i have an accident with this engine and turbo i can be liable if someone is injured or killed hmmmmm.Then again there are guys with 350 chevs regersted as 283ci

Modified by Bart at 1:16 AM 11/23/2004
Modified by Bart at 1:17 AM 11/23/2004