Rear Cylinder Coolant Bypass Modification
#21
Originally Posted by aleok
i think i'm dumb, but i don't get it...
As overZealous has explained the water at the rear of the block at cyl 5 & 6 exits up through the holes in the cylinder head gasket & then into the heads
where it meets water that is coming through from the front of the cylinder heads.
This combined water exits at the rear of both cylinder heads into the water manifold that then returns the water via the pipe to the top of the radiator.
With the Mod installed, when the water in that rear manifold reaches 190deg some of the water from the block now has an alternitave & quicker exit route that does not mix with the water at the rear of the heads.
Does it work ? Sharif test proves it does & Nissan wouldn't go to the added expence if it didn't.
What I would like to see is a clear pipe from the block to the thermo housing to see how much flow there is when the thermostat opens.
The large size of the hose and thermo housing suggests a lot, but the openings in the block at bottom of that square are only small.
Maybe a 3/4" (or 1" if it will fit) fitting drilled & tapped into both the rear water manifold & square blanking plate then connected by hose will do the same job.
Thanks Doug & Sharif
Last edited by Nathan; 06-07-2006 at 11:18 PM.
#23
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Just happened to read this. Looks excellent, and this is exactly why I'm waiting a little while longer before buying a built motor. It seems that lately, the science of building VQ35's has made some important leaps forward. Thanks for sharing, Sharif, and keep up the good work.
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Just figured out that this will work for the FWD VQ35 guys too.. The VQ30DE-K (2000/2001, 227hp 3.0) has the same exit plate and thermostat housing adapted into the piping. However, it wraps back around the left side of the engine, as needed in FWD configuration. The VQ35DE FWD blocks, strangely, lack this rear water exit. However, the casting is still there, and the holes are tapped to bolt the water pipe housing up. So, by drilling/dremeling the holes out inside of the casting in the block, and, by borrowing the piping/hoses from the VQ30 allows for a bolt-in sollution for the FWD VQ35 guys.
Travis
Travis
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Geerts (02-20-2020)
#28
the burninator
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how much labor would be involved with doing this if the engine is already in the car? How many realistic hours?
Would it be a serious pain in the *** to do or just takes time?
I'm extremely interested in this, but first want to see other's findings since it seems that a lot of people are going to jump on board to do this
would there be a benefit to using a lower temp thermostat or would it pretty much be open all the time then and have no benefit?
Would it be a serious pain in the *** to do or just takes time?
I'm extremely interested in this, but first want to see other's findings since it seems that a lot of people are going to jump on board to do this
would there be a benefit to using a lower temp thermostat or would it pretty much be open all the time then and have no benefit?
Last edited by sentry65; 06-08-2006 at 10:08 AM.
#29
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Originally Posted by sentry65
how much labor would be involved with doing this if the engine is already in the car? How many realistic hours?
Would it be a serious pain in the *** to do or just takes time?
I'm extremely interested in this, but first want to see other's findings since it seems that a lot of people are going to jump on board to do this
would there be a benefit to using a lower temp thermostat or would it pretty much be open all the time then and have no benefit?
Would it be a serious pain in the *** to do or just takes time?
I'm extremely interested in this, but first want to see other's findings since it seems that a lot of people are going to jump on board to do this
would there be a benefit to using a lower temp thermostat or would it pretty much be open all the time then and have no benefit?
#30
the burninator
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I thought there was a 2nd thermostat installed with this mod back behind the engine - am I not understanding it?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
would this mod be good for a stock engine or is it more for a sleeved engine where temps are going to be higher?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
would this mod be good for a stock engine or is it more for a sleeved engine where temps are going to be higher?
Last edited by sentry65; 06-08-2006 at 10:30 AM.
#31
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Originally Posted by sentry65
I thought there was a 2nd thermostat installed with this mod back behind the engine - am I not understanding it?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
would this mod be good for a stock engine or is it more for a sleeved engine where temps are going to be higher?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
would this mod be good for a stock engine or is it more for a sleeved engine where temps are going to be higher?
#32
so what the hell does this all mean? better cooling? more power? wtf...
In short, your engine will run much cooler at high boost and higher RPM operation. It allows eliminated the tendancy for coolant temps to "Race" upward as load and RPM increase.
I thought there was a 2nd thermostat installed with this mod back behind the engine - am I not understanding it?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
would you be able to skip the thermostat if the car will almost never see below 35 degrees?
how much labor would be involved with doing this if the engine is already in the car? How many realistic hours?
would this mod be good for a stock engine or is it more for a sleeved engine where temps are going to be higher?
#34
Originally Posted by sentry65
Sharif, how soon are you going to be offering this as a kit?
Right now, we are packing and moving to the new shop, so it will be about 1 week before I can order more kits.
#36
Originally Posted by sentry65
if you were to not use the 2nd thermostat, I'm assuming you'd have to wait a couple extra minutes for the car to warm up before driving right?
seems like if you're not going to run the 2nd thermostat, you might as well not run the regular thermostat as well right?
seems like if you're not going to run the 2nd thermostat, you might as well not run the regular thermostat as well right?
The flow of the water into the motor is still controlled by the original thermostat.
Until the motor reaches the original thermostats opening point there is no flow.
What the new thermostat does is allow some (most?) of the block water to flow out without going through the heads when that area of the cooling system is geting close to boiling point .
In short, the overall opperating temp of the motor is still controlled by the original thermostat
Last edited by Nathan; 06-08-2006 at 02:33 PM.
#38
Originally Posted by Nathan
In short, the overall opperating temp of the motor is still controlled by the original thermostat
#40
Originally Posted by reptile718
subscribing.....
I wish there was some directions with pics for the do it yourselfer then I would buy this kit and have at it
I wish there was some directions with pics for the do it yourselfer then I would buy this kit and have at it