vn v6 intake manifold/head difference between series one and series 2/vp/vr

[hakhawk]

ok, for those that want to know the differences between series one and series 2 vn v6 (series 2 is also vp, vr) heads and intrake manifold, heres some pics. i dont feel liek listing every different thing, but the pics show most of them quite easily.

just post if you have any queries, yme or someone else will give you an answer

[chevy_big_block_bro]

im not sure if its just me but the S2 manifold looks like it has more rough cast marks inside.

Dose anyone know what the round thing attached to the bottom of the S1 manifold it.
I had a look at the one on my old manifold and it didn't seem to have a purpose

[383 hatch]

The round piece on the bottom of the series 1 manifold is below the positive crankcase ventilation (PCV) valve. It stops the oil from being splashed up the into the PCV valve. The PCV valve is just a one way breather and shouldnt have oil being splashed up through it.

[greenfoam]

The only real difference between them is that the series 2 has runners that are about 1 inch longer. It's worth a few KW and NM

[1991_Vn2nV]

The series 2 intake manifold cannot be fitted to the Series 1 can it?

[hakhawk]

it can, just look at the pics. they will bolt up fine, just you will either have to use only the rocker cover pipe for pcv or.... you can with a little work, drill the holes in the head, just be real careful not to go too far.

[1991_Vn2nV]

what about the different coolant passages?

[hakhawk]

coolant passages are in same spots. but one on the s2 is blocked off, but this doesnt matter, as the coolant passages in the heads are the same.

[1991_Vn2nV]

Ah ok fair enough. In the manual it says thats why the series 2 intake cant go on the series 1 engine, cause of revised coolant passages.

[hakhawk]

well, they look the same to me. all the hosing is revised, so you'd have to change the hoses to suit. gaskets match up, as holden supposedly only sells the s2 gaskets now.

[chevy_big_block_bro]

The only real difference between them is that the series 2 has runners that are about 1 inch longer. It's worth a few KW and NM

Why is the S1 VN suposed to be the torquiest engine if the runners arnt as long

[greenfoam]

It's got a bit more radical tune and a more serious camshaft (so the legend says), also the tube exhausts on the VN maybe a little better than the VP's cast ones. I'd say the VR executive with a retune is the fastest out of all three early models anyway

[1991_Vn2nV]

Why is the S1 VN suposed to be the torquiest engine if the runners arnt as long

The series 2 has more torque, although only 1NM more.

The series 1 engine has more torque down low though with 92% of max torque available from just 1200rpm through to 4000rpm. After 4000rpm though the torque drops off pretty quick, where as the VN S2 doesnt develop as much torque down low, but retains it later in the rev range.

[immortality]

My understanding is that the S1 had a higher lift less duration than S2 which had less lift but longer duration which sound correct when the S1 had more torque early vs torque later in the rpm range. the high lift/less duration setup does have the down side of faster wear/tear in the valve train region unfortunatly. by fitting high ratio rockers to the S2 plus lifting the compression ratio slightly you should be able to get the same bottom end as the S1 with the top end benefits of the S2 engine

[simc]

Anyone know if the VP and VR heads the same? Was it just the higher pistons that knocked up the compression?

[fnlow1]

Is there a thread sumwhere that talks about the possibility of fitting ecotec heads to an earlier model V6?

cheers

[hakhawk]

mm, not on here. try here: http://www.bonnevilleclub.com/forum/...t=l36+l27+head

its doable, but alot of work.

[cozer]

ok, for those that want to know the differences between series one and series 2 vn v6 (series 2 is also vp, vr) heads and intrake manifold, heres some pics. i dont feel liek listing every different thing, but the pics show most of them quite easily.

just post if you have any queries, yme or someone else will give you an answer

does anyone know if s2 fuel rail will fit on s1 or of a way to change the s1 pressure reg???

[hakhawk]

fuel rails arent compatible, mounting positions are different. changing fuel reg, im not sure, but id assume you'd need a fitting made to connect to rail, then run a aftermarket inline fuel reg

[vq rat]

Does anyone make off the shelf fuel rails to suit v6s that you can run a aftermarket fuel reg ?????

[battist09]

i converted a vn s2 v6 intake over to my s1 engine i used the fuel rails off the s2 intake an throttle body etc i just had to run the temp sensor an sender wires to the front under the alt insted of having them run at the back. everything runs fine. i have a problem with my thermo fans tho they wnt kick in the wiring to the ecu is all ok and all fuses an sensors an relays are all fine but fan still wnt kick in any thoughts??????

[dhosky]

S2 v6s also have a plasic bellmouth inside the manifold take it out you will gain a bit of low end power from doing this ,series ones dont have them at all

[Super_Low 91]

What about mounting the series 2 intake backwards so that the throttle faces forwards? ( reverse mounted style ), could it be done without modifications?

[hakhawk]

What about mounting the series 2 intake backwards so that the throttle faces forwards? ( reverse mounted style ), could it be done without modifications?

you'd need to relocate the alternator and anything else that will get in the way, but it can be bolted up 180deg around

[Super_Low 91]

so if i relocate the alternator an the other lil things in the way it will work fine. hmm,