VG30E from a Quest head swap
VG30E from a Quest head swap
I have a 95 hardbody with a VG30E the bottom end is screwed and the only vg30 I can find around here is a out of a quest now I've been reading about how the quest has a non interference meaning the cams are non adjustable if I'm correct which makes less power now if I take the heads off my old motor and put them on the one out of the quest would that solve this or is there more to it? Also does anyone know that the transmission would bolt up? seeing as the quest is a FWD vehicle?
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mtcookson
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1992 Iinfiniti Q45
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The Quest/Villager simply had different cams than the other VG's (little less lift to make it non-interference). Using your truck heads would work fine and give you the same power output your truck originally had.
The blocks will be identical so all you have to do is swap all of the external pieces from you truck block to the Quest block:
- Oil pump, pickup tube, and oil pan (if they're different, which I'm pretty sure they are)- Various sensors on the block to be on the safe sideAccessory bracketsCrank pulleyUpper and lower intake manifoldValve covers and distributor if they are different
That should pretty much be it. Its real easy, just set them side by side and start swapping parts over pretty much.
Be sure to put in new front and rear main seals while its out and you may even consider cam seals just to be on the safe side. If you get a head gasket kit the cam seals should be included. Be sure to also get a new timing belt and, to be on the safe side, a new tensioner as well.
The blocks will be identical so all you have to do is swap all of the external pieces from you truck block to the Quest block:
- Oil pump, pickup tube, and oil pan (if they're different, which I'm pretty sure they are)- Various sensors on the block to be on the safe sideAccessory bracketsCrank pulleyUpper and lower intake manifoldValve covers and distributor if they are different
That should pretty much be it. Its real easy, just set them side by side and start swapping parts over pretty much.
Be sure to put in new front and rear main seals while its out and you may even consider cam seals just to be on the safe side. If you get a head gasket kit the cam seals should be included. Be sure to also get a new timing belt and, to be on the safe side, a new tensioner as well.
Re: (mtcookson)
Pistons on the Quest/villager are also 8.9:1 CR instead of 9.0:1 of the Hardbody.Might loose 1 or 2 HP because of it lol
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mtcookson
- Posts: 2204
- Joined: Thu Nov 21, 2002 12:43 pm
- Car: 1991 Nissan 300ZX
1992 Iinfiniti Q45
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Did they really change that in the VG30? I thought that was only in the VG33. Gotta go check it out now.
Edit:
I double checked a Quest FSM and it says they still have 9:1 compression so I believe the changes are solely in the cams (low lift). I'm pretty sure the 8.9:1 started in the VG33. I've seen claims that all VG33's are non-interference... but I'm not sure on that one.
What I can tell you is that the intake cam height (top of lobe to bottom) in the VG33 Quest is 38.943 mm - 39.133 mm and in the Frontier VG33 is 39.242 mm - 39.432 mm. The truck cam should have some more lift basically. Exhaust cams are the same so if the Quest is non-interference... the "truck" VG33 should at least be non-interference at the exhaust valves.
Edit 2:
Quest, 2000.5+ Frontier, Pathfinder, and Xterra VG33E(R) intake and exhaust cam height:38.943 mm - 39.133 mm
1999-2000 Frontier VG33 intake cam height:39.242 mm - 39.432 mmExhaust:38.943 mm - 39.133 mm
Maybe all of the VG33's are non-interference after all...
Edit:
I double checked a Quest FSM and it says they still have 9:1 compression so I believe the changes are solely in the cams (low lift). I'm pretty sure the 8.9:1 started in the VG33. I've seen claims that all VG33's are non-interference... but I'm not sure on that one.
What I can tell you is that the intake cam height (top of lobe to bottom) in the VG33 Quest is 38.943 mm - 39.133 mm and in the Frontier VG33 is 39.242 mm - 39.432 mm. The truck cam should have some more lift basically. Exhaust cams are the same so if the Quest is non-interference... the "truck" VG33 should at least be non-interference at the exhaust valves.
Edit 2:
Quest, 2000.5+ Frontier, Pathfinder, and Xterra VG33E(R) intake and exhaust cam height:38.943 mm - 39.133 mm
1999-2000 Frontier VG33 intake cam height:39.242 mm - 39.432 mmExhaust:38.943 mm - 39.133 mm
Maybe all of the VG33's are non-interference after all...
Re: (mtcookson)
hmm something is fishy. I know that the quest/villager non-interference 3.0L pistons have significantly deeper grooves in them, effectively lowering compression ratio from 9 to 8.9:1. Strange that the FSM says this. This is what helps it not contact the valves, of course, along with the cam lift. WTF? I dunno.
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mtcookson
- Posts: 2204
- Joined: Thu Nov 21, 2002 12:43 pm
- Car: 1991 Nissan 300ZX
1992 Iinfiniti Q45
and much much more - Contact:
Looking at the FSM again I see what you're talking about, though it almost looks like they're depicting a slightly higher dome in the center. If so, that's likely what is bringing the compression back up.
http://www.nicoclub.com/FSM/quest/
Look at the 94-95 FSM - EM.pdf - page 48.
http://www.nicoclub.com/FSM/quest/
Look at the 94-95 FSM - EM.pdf - page 48.
Re: (mtcookson)
I have the same FSM and I referred to it before I posted . I saw a quest/villager 3.0L piston once and I mentally noted the deep grooves thinking it was odd...but it was a long time ago, and waaaay before I was aware of domes and what they would do LOL. So I just don't remember if I saw that or not. I learned a lot in the last few years. Sheesh, 5 years ago I was that guy wanting to get rid of my VG because I just didn't see the light yet and Zbum and others were right there to make sure I got flamed...nice and toasty.