My 22k engine replaced by Nissan is using 3 quarts per 1k miles.

I am doing an NA stroker and can't wait to get it back!

Specs are BC 88mm crank, BC rods 96.5 JE 11.0.1 pistons +1mm Manley valves and Jim Wolf S7 cams.

I bought a sub 10k oil consumer block & heads so the build could be done and I could keep my car.













































Dropped off this morning. Estimate is a week for the install.

 

Nice parts there buddy. Hope the build is everything you want it too be.

What made you go with +1mm valves?

 

They were available at a great price and I figured more flow is good.

 

Woot!

Block is back!!!

 

Can't wait to see how this turns out. Hurry!

 

I also can't wait, but I have to. There have been the usual build delays, it's like Xmas day being pushed back daily

Whoever said patience was a virtue never waited for a motor build!

lol

 

Congrats man. Are you still using UPRev or are you tunning with something else? As if you haven't spent enough, lol, it sounds like you would need Haltech for this one.

 

I plan to tune it using UPREV at first seeing as it's "only" 300 for a new tune.

 

Good luck..

 

Good luck. Hope everything works out and it's what you were hoping for.

 

Thanks. Primarily my hope is more power, and no oil consumption.

If I get alot more power that is a bonus, I don't expect that much though but at least it will be reliable.

 

Sub'd. Good luck with everything! Looking forward to results.

 

You should be pretty well off. I'm assuming its going to be a 3.8 liter?, but the new crank should deliver more than enough torque to negate any low end torque lost from the cams. Also your 4.08 gears should make it pretty interesting to keep power to the ground. A challenge I would love to have. Keep us posted!

 

Well it be a high rev engine ? Something like 8000rpm+ if possible that would be fun car to drive .

Have u consider IBT and nismo oil pump ? Thinking out loud
Hope u enjoy u car,

 

I think it will be 3.9, math is not my strong suit.

It has the components to allow high revs, I'll see what it does after the break in and we will set the limit accordingly.

Took a few new pictures today. Heads not back yet.

 

nice. movving along quickly. Who did the head work? will they be flow tested?

 

The machinist is subcontracted by my mechanic, don't know who it is. All possible steps are being taken to get as much out of the motor as possible.

Spoke to shop machinist needed a different hone to mill the valve guides to the 6/10th the Manley valves need so another day lost

Ordered this pick it up locally in the morning:









It is a Frontier mod that cools the back of the block & heads better.

 

Nice progress, keep up updated!

 

Here is an excellent writeup I found.

Go with the flow : The VQ35 Cooling System | VQ35.com

Go with the flow : The VQ35 Cooling System
On July 13, 2010, in Engine, by B.Hobbs

Heat

You may consider it your enemy, it has definitely been responsible for more than a few oddly shaped pistons and blown head gaskets. The fact of the matter is that heat is simply energy, it works both for us and against us. A tremendous amount of heat is generated from the combustion process and put to work, the more we can harness the more efficient our engine becomes.

Approximately 1/3 of that heat is wasted through exhaust gas ( which can be utilized by turbochargers, but that is another story ) approximately another 1/3 is actually used to drive the piston downward and get the job done. The remainder of this heat energy is radiated outward from the cylinder and your cooling system is designed to transfer that heat to your coolant and pass it through a heat exchanger to keep engine temperatures in check.



This is the cooling circuit diagram for the VQ35 straight from the 03 350Z factory service manual. One look at this diagram will tell you that this aint your granpappy’s ol’ small block. Shortly after the 350z was released, aftermarket performance parts came pouring out of the woodwork to support enthusiasts.

Before you knew it there were big time turbo kits and high powered engine builds to the tune of 600whp. It was then that these tuners began to see the apparent downfall of the cooling system for the VQ35 used in the Z33. In this diagram you will see the rear cylinders ( #5 and #6 ) circled in red. If you follow the flow chart from the water pump you will see that coolant flows into the engine from that point, up through the heads and into the engine block. Coolant flows from the front of the head to the rear and exits through the water pipe connected to both sides.

The block on the other hand is another story, the coolant flows from the front of the engine to the rear cylinders and has nowhere else to go. I’m not about to call out Nissan engineers (although I’ve had cause to curse them in the past) because under normal and even spirited driving conditions the factory cooling system will keep engine temps manageable. However, under heavy load conditions such as a long highway pull on a high powered engine or pulling lots of weight uphill, coolant flow to the rear cylinders is insufficient and can lead to troublesome or even catastrophic engine failure in the form of blown head gaskets or over expanded pistons that will have a once smooth cylinder looking more like a funnel.



Enter the Pathfinder. The VQ35 found in the Pathfinder is only slightly different than the Z33 VQ35, but the one major difference worthy of discussion in this particular post is pointed out in red on this cooling circuit diagram.

If you follow the same flow, from the water pump and into the engine block, you’ll find that the coolant now has a “back door” out of the block where it will meet the other superheated coolant from the heads and return to the radiator. A thermostat is in place between the block and water pipe (shown on the diagram as an X) simply to let the engine reach operating temperature more quickly and reduce emissions.

Nissan engineers saw this one coming during their road tests for the Pathfinder, though they didn’t tune those VQ35′s to unscrupulous amounts of power, they more likely just ran them really hard off road and hauled lots of weight uphill. There’s no telling how many engines they scrapped before they decided on this system, but their loss is our gain.

Many fine retailers have put together “Pathfinder cooling mod” kits that will supply you with the rear coolant pipe, thermostat, hose and plate that you can swap right into your Z33 to greatly improve your coolant flow and safeguard your rear cylinders.

Is it something that your momma needs on her sedan to run to the grocery store? No, but you should give the Pathfinder system as well as other “reliability mods” some consideration if you plan to really put your VQ35 through a beating with lots of boost or serious track time.

 

Picked up the cooling parts from Coz this morning.