crank probably weighs.. i dunno.. 45 lb? 55lb?

i am not expecting a precise ammount... I have not tried to see what these turbos have in them... but I would HOPE for 650-700rhwp. maybe more if i put in some nitrous. In the right hands and driven correctly its always controlable... unless my defination differs from yours

 

You shouldn't have to hope for that... There is quite a bit more in those turbos

 

yea different people feel differently about this pair of turbos... so i figure ill just find out the hard way.

 

Man, I can't wait anymore. Good luck Charles.

 

were you able to tear down the stock block to see if there was any wear and tear from the turbos? were you able to measure the rods to see if there were fatigued?

 

the stock block still has the pistons and rods in but there are no currently visable signs of damage. the pistons and rods will go straight in the trash... so if there are no visable signs than I am going to assume they help up just fine. Sure seems like they did.

 

man charles, once i get my testpipes in spring im bringing them over to CJM for a install... and hopefully get a quick spin around the block in this beast ?

 

I got a good look at the coolant holes and you hit the nail on the head. That number of holes definitely DOES worry me. This seems to be a common underengineered (or engineered for something else, obviously) trait of Nissan motors. The RB26 has the same issue with major power; overheating the head. I trust you've matched it all up and that's all there is, but I'd personally want more than that. I've looked at plenty of 4G63 heads, etc. that make the kind of specific horsepower we're all moving towards here and there is a much better distribution and flow of coolant to the head. I wonder if it's something that could be modified.

Mark
www.Quantum-Racing.com
Home of the Dynapack Dyno

 

QuantumZ: I understand your concerns... but when I said not to worry about the coolant flow I was refering to the sleeves... not the engineering of the factory layout.

To adress your concerns, it would be very easy to increase flow... simply enlarge the pinholes in the headgasket. The head will gladly accept more and even my sleeved block has a much larger opening... its just the headgasket.

Of course if coolant flows too quickly thru the engine it will not absorb as much heat. Also, just because the coolant does flow into the head at that cylinder doesnt mean its not passing by that cylinders combustion chamber... but to address your concerns ill follow around the coolant paths and see how it looks... maybe opening up my headgasket just a hair would be a decent idea. Ill look into it... but to come up with any solid information is next to impossible on something such as this... as you can do is use your best judgement which could be much worse or much better than factory design.

 

update on the project: today we are overnighting the SGP retainers to Ferrea to have them precisely machine them to fit their valves and 6mm valve locks then they will overnight them back.

Monday I should be back on track.

 

An increase in velocity of the coolant should always provide better cooling then a slower one... im pretty sure. This is assuming the radiator can keep up.

 

you could be right... but i always figured if it moved too quickly it would not absorb heat as efficienty.

 

more coolant flow = more cooling

the heat will be "attracted" to the water, regardless of how fast it is moving.

think of it like wind chill. the air steals the heat from you the faster it blows by you. the coolant will take the heat as fast as you can give it to it

 

sounds good to me.

 

Your theory is not 100% correct.
A lot of modern radiators, mostly european round tube type, have diffusers in the tubes to slow the coolant down to allow better heat exchange.

 

FINALLY.

We are back in business. Sitting next to me are my cylinder heads and we have them assembled with the entire ferrea valvetrain.

Soon I will be posting pics of installing them to the block and I will go thru the valve lash adjustment process and take some pics and give you guys a description of that.

-Charles
CJM

 

ahhhhh nevermind.

the head alignment pins are backordered.

nissan parts division is easily the worst ever.

so ill post in a week or two or three or four or whenever i have dowel pins to put the heads on the block.

-Charles

 

Fug...

 

SGP saved the day!

They have some in stock so I ordered them overnight. Thanks SGP!

-Charles

 

Man....I'm really exicted. I can't wait to read your results and check out the pics. You should have quite the beast when you're all done.

This must be what women feel like when they watch soap operas.

Jeff