Differences to Vn & Vr Buick..

[Brin]

Hey guys,

Was wondering if anyone knew the differences to the VN and the VR V6??

It's been awhile since I opened my hood the the VN V6, and the only difference I can see to the VR V6 is that the dip stick is in a different spot? As is the thermostat.

And also, is bellmouth removal on the VN the same as in the VR?

Any other changes?

Thanks guys.

[Cobez]

I believe the inlet manifold on the VR is lightly more open than the VN Buick engine. Don't quote me on that though. Don't bother with the bellmouth removal. It does nothing but lean the 2 rear cylinders out. The bellmouth is in there to evenly distribute air to all 6 cylinders. If you MUST do this "modification" because everyone else does it, just take it out, cut the end off the snout a bit.

[Brin]

Thats what I was going to do, just cut out half of it n see how she goes with this one. I had it removed on the VN and it was as good as an lsd :P Hehe.

[Brin]

I miss the torque the VN had, so will remove half of bellmouth and test the difference. If I scr3w it up... three bux for a newie

[Cobez]

Hahahaha, i'd say a stock Holden LSD is more effective than removing the bellmouth on a Buick V6

Yeah just evenly cut the snout, but even that will do sweet F/A. If you wanna mod your 6 and get good airflow, get the heads ported and polished, match ported inlet manifold with twin throttle body's, or at least a bored out to 70mm throttle body and some sort of custom air intake.

[Pub247]

Vn s1 ran a slightly different cam resulting in a bit more torque.
A few diferences between vn's & vr's. VR has more compression than vn also run a different timing cover with a hole for cam phase sensor. Vn has the same setup on timing cover but the hole is not drilled. There's also other things like better main caps run a different cam thrust plate also run different rockers which are rollers on the pedestal but not roller tipped. Vn series one have thermostat at the back of motor and different pcv setup (dont have holes in head like later motors. They also use a 3/8 rocker bolt instead of later 5/16. Also cam thrust plate is actually on the cam in S1 vn motors

[padrickz88]

so there is nothing needed just to throw the vr engine into a vn?

[Pub247]

You'd have to swap timing covers or you could leave cam sensor in but not hooked up. If its a series 1 then you'd have to change the radiator to one with a cap and remove the resiviour other than that not really just have to use vn auto instaed of VR one.
Note some of the wiring may not line up properly but i think its all the same

[Brin]

Hahahaha, i'd say a stock Holden LSD is more effective than removing the bellmouth on a Buick V6

Yeah just evenly cut the snout, but even that will do sweet F/A. If you wanna mod your 6 and get good airflow, get the heads ported and polished, match ported inlet manifold with twin throttle body's, or at least a bored out to 70mm throttle body and some sort of custom air intake.

Haha, yeh, agreed.

I already have a custom made CAI.. with hosing from the air box to the front bumper.

I dream of Group A twin thottle bodies. I have a V8 one though

[Brin]

Vn s1 ran a slightly different cam resulting in a bit more torque.
A few diferences between vn's & vr's. VR has more compression than vn also run a different timing cover with a hole for cam phase sensor. Vn has the same setup on timing cover but the hole is not drilled. There's also other things like better main caps run a different cam thrust plate also run different rockers which are rollers on the pedestal but not roller tipped. Vn series one have thermostat at the back of motor and different pcv setup (dont have holes in head like later motors. They also use a 3/8 rocker bolt instead of later 5/16. Also cam thrust plate is actually on the cam in S1 vn motors

Thanks, cool.

Are the sensors or in the same/similar spots?

[Zuicider]

You'd have to swap timing covers or you could leave cam sensor in but not hooked up. If its a series 1 then you'd have to change the radiator to one with a cap and remove the resiviour other than that not really just have to use vn auto instaed of VR one.
Note some of the wiring may not line up properly but i think its all the same

got a vr intake running on a series one block and heads, alot cleaner for the engine bay, vn series one runs a high pressure cooling system, while the vr wasnt . vr ran a 2 openeing heater tap while the vn ran a 4.

[Pub247]

got a vr intake running on a series one block and heads, alot cleaner for the engine bay, vn series one runs a high pressure cooling system, while the vr wasnt . vr ran a 2 openeing heater tap while the vn ran a 4.

How'd you hook up the pcv system?? did you use seires 1 rocker covers

[Zuicider]

yer the series one rockers for now, waiting on getting a job to get sum ported vr heads before i get too spot on

[azkwazere]

I believe the inlet manifold on the VR is lightly more open than the VN Buick engine. Don't quote me on that though. Don't bother with the bellmouth removal. It does nothing but lean the 2 rear cylinders out. The bellmouth is in there to evenly distribute air to all 6 cylinders. If you MUST do this "modification" because everyone else does it, just take it out, cut the end off the snout a bit.

Series I didnt have a bellmouth, was added the SII to reduce that awesome lumpy idle. So you could add it as a mod

the vr engine has a higher static comp ratio... i think its 10:1 or 9.5:1 where the VN/VP is like 8.5 or something like that, it has a slightly higher ratio.

The SI engine has a different heads, inlet manifold and crank setup.

Swapping a VR into a VN is ok pending trans, may need a new flywheel etc.. otherwise should go straight in. If its a SI your replacing then you'll need a new radiator as the SI doesn't have the over flow setup that SII does.. has a different filler too...

aZk.

SI is a raw engine, seriously violent lol...

[greenfoam]

Ok well the VN S1 had a bit more agro cam, alot more agro tune (about 6 degrees more advance)

The S2/VR has a better intake manifold, another inch runner length and generally justa little better

The S2/VR has better exhaust manifolds (cast ones but better flow than the all the wrong way VN S1 headers)

The VR has better rockers (half roller)

The VR has more compression (heads)

All up the VR engine aside from the tune is a faster motor than the series 1 as is the VP, If you are replacing a S1 engine definatly go straight to VR even better ecotec

[Pub247]

Actually greenfoam the more comp is made up in the piston than the heads at least i'm almost certain it is

[padrickz88]

YAY FOR ME! im in the process of putting the vr engine in (killed 2 series 1's...)

thanks for the info pub and foam...

sorry for jacking your thread brinnahh

[Brin]

Hehe, all good Padrickz!

Go the VR! (just coz I have one..lol)

Never owned a S1 so I can't pretend to know too much about it, S2 VR should be a straight swap. I ran mine on the VN comp and trans and was fine, now running on VN comp and VP trans - even better.

I wanted to ecotec the VN... So so so bad. But didn't have time or money to mess around with comps and looms at the time. Damnt. Wasted money on the buick, money I have spent to get it going PROPERLY i could have chucked an ecotec in myself. Or stolen Moms from her VT hahaha.

[joe_rolls_commo]

I believe the inlet manifold on the VR is lightly more open than the VN Buick engine. Don't quote me on that though. Don't bother with the bellmouth removal. It does nothing but lean the 2 rear cylinders out. The bellmouth is in there to evenly distribute air to all 6 cylinders. If you MUST do this "modification" because everyone else does it, just take it out, cut the end off the snout a bit.

Can someone please explain this to me?

[Cheap6]

Can someone please explain this to me?

The leaning bit?

Take your garden hose, turn on the tap some. With a jet nozzle attached to the hose and held away from your body, with the nozzle horizontal, how much water hits your feet? Not very much I'll wager. Try the same trick without the jet nozzle and the hose end held close to your body, and more water will hit your feet.

The air in the inlet manifold behaves in an analogous way, with the rear two cylinders being your feet, and the low pressure in the cylinders replacing gravity as the driving force for the change in fluid flow direction.

Where the amount of fuel being added is the same for each cylinder (averaged across all cylinders) more air, same fuel = lean.

[reaper01]

The S2/VR has a better intake manifold, another inch runner length and generally justa little better


Is it different to the vp manifold?