No misinterpretations, trick240sx.
But there are still more questions unanswered.
Your machinist friend, how will he properly hone the cylinders? What I had planned on doing was making my own torque plates, out of a pair of worn-out VH45DE heads I have. You either need plates out of cast aluminum (aluminum identical to VH45DE heads is what you need) to machine your own plates out of, or to cut up a set of otherwise unusable VH45DE heads, which will more accurately simulate the precise distortion of Q45 heads, despite having 93+mm holes cut out of the top of them.
Custom pistons might not be that hard to come by. Doesn't the 300ZX TT use a 93mm bore? Its worth looking into, you would just have to make sure the wrist pins will match the rods you will use, which is more doubtful. The VH45 has a longer stroke than a VG30 so it almost definitely has its deck height, rod length, and piston/ring package optimized for its application.
Capabilities of the 1990 Infinity Q45 Engine
sijoko wrote:Is there any way to strengthen the stock cast pistons?
How about cryo-treating them? This would keep costs down, if it can be done.
-sijoko
You might be able to have them hot isostatic pressure treated, but I am not sure if that would change the dimensions of the part, or if it would be cheaper in the long run, and as insurance, to not cut corners and go with custom forged pistons with design compensations for higher cylinder pressure (like compression rings moved down, quench pad mating.)
Both heads ported for $500? I realize it is a friend price, but head work isn't just head work. There is only one thing that matters when it comes to modifying cylinder heads, and that is quality. I don't doubt your friend can do a good job because you said he has experience and I don't know him, but like I said, no two port jobs are the same unless a CNC machine does them.
Think about it. Have you told him that he has to do twice the amount of valve seat grinding and 50% more intake port work?
Unless your friend, who I am not bashing on, is a brilliant porting artist who can nail a set of heads he's never done before the first time, you are throwing away power.
What I was going to do was have a set of heads experimentally ported and flow tested, one set of heads made into torque plates, and the last set of heads on the engine going in the car waiting to be ported with the knowledge gained from the experiments. Of course, that means 3 motors. I have two rebuildable ones in my basement I got for cheap, and the already running one I will use in the S13 will come from a clip.
But now, I am thinking about not doing the 450SX because I don't have the money, and I am beginning to re-open the question of whether it is worth it or not. trick240sx, if you want a couple spare rebuildable engines for cheap (just in case, or for extra heads for porting/torque plates like I was going to do), send me an email because I'd like the space back.
Think about it. Have you told him that he has to do twice the amount of valve seat grinding and 50% more intake port work?
Unless your friend, who I am not bashing on, is a brilliant porting artist who can nail a set of heads he's never done before the first time, you are throwing away power.
What I was going to do was have a set of heads experimentally ported and flow tested, one set of heads made into torque plates, and the last set of heads on the engine going in the car waiting to be ported with the knowledge gained from the experiments. Of course, that means 3 motors. I have two rebuildable ones in my basement I got for cheap, and the already running one I will use in the S13 will come from a clip.
But now, I am thinking about not doing the 450SX because I don't have the money, and I am beginning to re-open the question of whether it is worth it or not. trick240sx, if you want a couple spare rebuildable engines for cheap (just in case, or for extra heads for porting/torque plates like I was going to do), send me an email because I'd like the space back.
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trick240sx
- Posts: 225
- Joined: Mon Jul 21, 2003 11:43 am
- Car: cars
Rembrandt trust me I know your not bashing. I just look at it as trial and error. He was going to start out by removing excess a little at a time and see the improvement from there. But how much are you asking for the spare engines. I might be interested in one of them. The place thats doing the stroker kit requires the crank and all to do the stroker kit so that will work. Let me know a price. Thanx again for all of your advice and help its noted.
The 'Aussie' part numbers for the exhaust manifolds on my right hand drive 1994 Infiniti Q45 are as follows: -
Left = 14002 - 61U11
Right = 14002 - 61U00
Could a NICO member please advise if this is the same for the 'American' left hand drive 1994 Q45.
If the part numbers are the same, I assume the manifolds are the same and I can sell my headers in the US
Many thanks
AGM
Left = 14002 - 61U11
Right = 14002 - 61U00
Could a NICO member please advise if this is the same for the 'American' left hand drive 1994 Q45.
If the part numbers are the same, I assume the manifolds are the same and I can sell my headers in the US
Many thanks
AGM
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sijoko
- Posts: 961
- Joined: Fri Jul 26, 2002 6:54 am
- Car: Black 1994 Infiniti Q45 Turbo, Pearl White 2014 Maxima Sport
- Contact:
AGM,
All 90-96 Q45 models came with the pre-cats.
Maybe your headers would still fit the U.S. models.
From what Q45tech posted, there are some Q's with JDM takeouts that are running the JDM manifolds.
Otherwise, the new owner can have a good shop modify them. Most of the work is already done. Just send them a driver's side manifold from a U.S. model for reference.
The passenger side would probably fit without any problems.
Can you post some pics of the headers?
Regards,
-sijoko
All 90-96 Q45 models came with the pre-cats.
Maybe your headers would still fit the U.S. models.
From what Q45tech posted, there are some Q's with JDM takeouts that are running the JDM manifolds.
Otherwise, the new owner can have a good shop modify them. Most of the work is already done. Just send them a driver's side manifold from a U.S. model for reference.
The passenger side would probably fit without any problems.
Can you post some pics of the headers?
Regards,
-sijoko
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HeavyDuty
- Posts: 1281
- Joined: Tue Sep 23, 2003 4:51 pm
- Car: 1995 Infiniti Q45
95 Nissan 240SX S14
96 Nissan D21
06 Nissan 350Z Z33
I see I'm a little late joining this party, and although I'm a noob to all things VH45DE, I must know if these headers are still available?
I have access to mild or stainless mandrel bends in any shape from 2"-5" for any mods that would need to be performed. I believe I'd be willing to try these beautiful stepped tube headers on for size.
It'd only be worth it (to myself or anyone else) if the equal length runners can be retained with no compromises to the stock accessories/chassis. I have CAD capabilities, outsource production resources and a dyno prepared to prove the end result.
Having a car that's a little different is a blessing and a curse, that only strengthens my resolve to do the few things I want to, headers being one of those.
I have access to mild or stainless mandrel bends in any shape from 2"-5" for any mods that would need to be performed. I believe I'd be willing to try these beautiful stepped tube headers on for size.
It'd only be worth it (to myself or anyone else) if the equal length runners can be retained with no compromises to the stock accessories/chassis. I have CAD capabilities, outsource production resources and a dyno prepared to prove the end result.
Having a car that's a little different is a blessing and a curse, that only strengthens my resolve to do the few things I want to, headers being one of those.