extra head cooling #6 cyl!!!!!

[quake]

lets get some thoughts on this topic good or bad idea. This should enable you to get some extra cooling capacity around the number 6 cyl. Post is on bottom of the page. Involves drilling the cyl head into a blocked passage.


http://mk3ukr-supra.com/cylinder_head_main.htm

 

[shaeff]

yeah, this trick has been around for a while. a European guy (zooloo) figured it out, i believe.

 

[Mr.PFloyd]

i did that to my head. No problems i can possibly think of aside from maybe less heater core heat.

 

[IJ.]

Has anyone actually tested this to see if it does anything?
(Have to wonder why Toyota decided to NOT drill the head?)

 

[TurboStreetCar]

Has anyone actually tested this to see if it does anything?
(Have to wonder why Toyota decided to NOT drill the head?)

:word8kn: Cant see it NOT making a difference but if it throws off the way coolant flows threw the block/head it might actually impair flow. Though the coolant that gets trapped in the back of the head cant help anything either.

 

[IJ.]

How does it get "trapped"?

You have a big arse Banjo back there into the heater lines/bypass hardpipe.

If someone can show me that this actually does something I'd happily pull the head off my fresh build and do it but I've never seen anything other than anecdotal evidence.

As I said Toyota had to have a reason to not drill the hole.

 

[TurboStreetCar]

Because theres no hole for the coolant to rise up from the block to give it flow where the other cylinders have holes. the only coolant to pass threw there is the already heated coolant from cylinder 5. where if there were holes, cooler coolant could rise from the block.

unless it flows differently then how i picture it.

 

[IJ.]

Water flow is from Bottom to top (heat rises)

 

[Mr.PFloyd]

Well the whole design aspect of the head's ever since yamaha didn't do this one is questionable to say the least. I am almost 100 percent positive that the 6m's had this opened up.

 

[bluedragon17]

How does it get "trapped"?

You have a big arse Banjo back there into the heater lines/bypass hardpipe.

If someone can show me that this actually does something I'd happily pull the head off my fresh build and do it but I've never seen anything other than anecdotal evidence.

As I said Toyota had to have a reason to not drill the hole.

+1 to that but if someone can prove it works in two weeks or less ill do it cua then ill put my motor back together with 2 more new additions

 

[IJ.]

You "might" see some cavitation errosion on the head surface there if there's a trapped air pocket but I can't see how this is going to improve cooling at all given the 2 large ports at the sides (back of the block is a dead end for the coolant anyway it's not going anywhere afer #6)

#6 suffers a bit as it's the last cylinder to get the coolant so it's been heated as if flows by #1>#5. if you could tap into the block between #3 and #4 and route the water pump outlet there you'd see a benefit.

This drilling the head just seems to be yet another "Supra Urban Myth" that hasn't really been thought through or tested.

 

[jdub]

How about tapping into the turbo feed line with a T-fitting and route to the drain hole near the #6 cylinder?

 

[NashMan]

i still say the best bet is to have booster pump like some german cars have

 

[pogoism9]

I dont think its worth taking apart half your motor to do really....

 

[quake]

not worth pulling the motor apart to do, though 6 runs hotter even with the egr removed also it is close to the fire wall

 

[BRIAN]

i still say the best bet is to have booster pump like some german cars have

OMFG I understood that whole post

 

[IJ.]

Not really enough flow there to warrant it John.

I do run a booster pump here

 

[mkIIIman089]

OMFG I understood that whole post

LMAO, I didn't even notice it was Nash until you posted this.

 

[Enraged]

where would you plumb in a pump? would it be to run for a few minutes after the car is shut off?

 

[IJ.]

Mine is in the Lower Rad hose and is set to come on at a certain temp, I use it for low speed summer traffic and for high rpm where the stock pump tends to cavitate.