extra head cooling #6 cyl!!!!!

[mk3ukr]

I have electric water pump in lower radiator hose, since I fitted it heater performance was poor - no forced flow through the heater as with mechanical pump. Since I drilled 2 holes in cylinder head heater performance got worse, sometimes it blows cold air instead of hot. My guess is probably Toyota omitted cyl.6 cooling holes for better heater performance ?? Though with mechanical water pump it shouldn't be the issue.
Here is cooling system diagram
http://www.mk3ukr-supra.com/Cooling System.pdf

 

[IJ.]

Vlad: My electric is as well as the mechanical pump not just the electric.

 

[mk3ukr]

Vlad: My electric is as well as the mechanical pump not just the electric.

Ian, I didn't realise you have 2 pumps. So they run in series at high load/rpm. Cool
My point in above post is after drilling 2 holes in (cylinder) head I had less natural flow through the heater.

 

[IJ.]

Vlad: Ahhh got ya now
(My heater will melt the glue from my sneakers)

Yes the will pump through whichever is slower at the time so no real obstruction and I can cruise around in Summer with the AC on and not have it overheat.

 

[7MGTEsup]

If you want to keep number 6 cool just run your heater full all the time:biglaugh:

 

[vas85]

Not really enough flow there to warrant it John.

I do run a booster pump here

I think we can clearly solve this myth in a matter of seconds by asking those with bigHP 7m's whether they have done this workaround for extra head cooling....


IJ?
Nate?
Duane?

If all 3 say 'no' then I think that more than confirms the need not to do it.

:naughty:

 

[IJ.]

Not BigHp here but "no"

 

[Cya]

AB flug had a kit to help with the #6 heating problem. You could easly rig on up. http://abflug.jp/products/

 

[Cya]

Access A70 click on second page a scroll down. They re-routed to hoses for better cooling at the rear of the engine.

 

[spoolint78]

i drilled my head.
no problems.

My engine builder suggested that one side effect could be less hot air inside the cabin, because the coolant will drain back faster, instead of going into the heater core.

 

[Mr.PFloyd]

i drilled my head.
no problems.

My engine builder suggested that one side effect could be less hot air inside the cabin, because the coolant will drain back faster, instead of going into the heater core.

which is the same machinist i got mine done, and we agreed on this face :biglaugh:

 

[Adjuster]

So, it seems they must be routing two T fittings and a hose between the heater hose feed, and the upper radiator hose? (Idea being to pull more coolant off the back of the motor faster....)

Interesting idea.


Why not just drill/tap AN10 male fitting to the thermostat housing, and run a hose back to a T fitting in the heater hose? It would pull about as much coolant as the heater hose, and would help to flow more coolant out of the back of the block in the process... (And look better than some fitting sticking into the middle of the upper radiator hose...)

Like the upper radiator hose location, it's going to flow/circulate coolant "around" the thermostat, so it will make your engine slower to heat up in the winter, but for a hot weather, or high load modification, it's not a bad idea. (A simple ball valve installed in the hose would allow seasonal use too...)

 

[IJ.]

Ummm the cold water comes up from the bottom of the block up into the head and back to the radiator.......

I really can't see that drilling that hole would make the slighest difference to cooling #6.

 

[quake]

Ummm the cold water comes up from the bottom of the block up into the head and back to the radiator.......

I really can't see that drilling that hole would make the slighest difference to cooling #6.

yeah our cooling sys runs in the opposite direction as ij stated. I made no compensation for the number six cyl in my engine, but what i did do is place my egt probe in this runner and make sure the egt,s are cool enough. Our motor was designed to run rich within reason and i kept it that way rather loose a bit of power and keep the engine alive. So in short run it rich and buy a bigger turbo lol:naughty:

 

[Red7m]

This article make's me wish I would of gotten my head cut for OS valves when I bought my ported head off of Erin Carpenter from supraforums. It also make me happy to see the flow sheets of his head done by Erin as he forgot to send me the flow sheets with my head.

 

[Cya]

I read up on the AB Flug set up a while back. As Adjuster stated its designed to route the coolant back to the radiator faster while racing. I believe the main idea was to supplement the stock system by adding another shorter route (by passing the heater somehow) back to the radiator instead of going through the side routing and back through the T-stat housing. It increases the volume of coolant back to radiator. Does this make sence I think im rambling.

Oh, believe this was for more the weekend warrior types. Hence the valves so that the flow would go back through the heater core. I still think it pretty trick, although not aesthetically(spell) pleasing.

 

[Cya]

I believe this route would be better than drilling the block for those of us who need heaters. Seeing as how with a switch of two valves you would have an overall cooler motor for racing then your heat for driving. Hell my Koyo w/ a 160 T-Stat kept my motor cool. An old racing trick is to pull the T-Stat out and run it like that. Your motor WILL run cooler, take it from experience. Keep in mind motors aren't designed to run ice cold.

 

[quake]

I believe this route would be better than drilling the block for those of us who need heaters. Seeing as how with a switch of two valves you would have an overall cooler motor for racing then your heat for driving. Hell my Koyo w/ a 160 T-Stat kept my motor cool. An old racing trick is to pull the T-Stat out and run it like that. Your motor WILL run cooler, take it from experience. Keep in mind motors aren't designed to run ice cold.

your 160 thermostat can waste quite a bit of fuel and keep the car out of closed loop operation. Assuming you are running a stock ecu. My car ran cool enough with just a stock cooling sys and a koyo with the ac on all summer.

 

[IJ.]

It doesn't really make sense if you look at the coolant flow paths

Rad>water pump> block> Up to Head> back to the Rad top hose.

If you bypass from the Rear of the head you're reducing flow at the front of the head?

 

[johnathan1]

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.

Ian, mind if I post that picture on a Porsche forum? The people over there seem to think the stock 924 Porsche pump (almost identical to the Supra's stock pump) would work much much better...