#21  
Old 01-14-2020, 06:32 PM
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Originally Posted by taff2 View Post
If you dry deck and use a reverse cooling system, the heads will actually get cooler water running through them, as it's come straight from the radiator and not pre-heated up from the block. If you want cooler running exhaust valves (and who doesn't?), then send your cooled water from the pump into the front of the heads at the exhaust side, (where the core /cup plug is on factory heads) and take it out of the heads at the rear on the exhaust side - this forces the majority of the coolant down the exhaust side water passages.
There is a better much more efficient way to do this...

  #22  
Old 01-14-2020, 06:58 PM
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There is a better much more efficient way to do this...
I'm assuming you put high pressure cool water into the heads at the centre exhaust valve area via a tube and fitting?
I like the dry decking myself, no chance of water in the cylinders.
Reverse cooling, well,it makes sense, cool water to the hot heads first, warmed water onwards to the cylinders. Much better for detonation resistance too,cooler heads. But each to their own.

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Old 01-14-2020, 07:01 PM
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Dragncar, yes I think there would be a benefit, LS engines are reverse cooled, one of the reasons they could run a higher compression on pump fuel.

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Old 01-14-2020, 07:07 PM
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Originally Posted by taff2 View Post
I'm assuming you put high pressure cool water into the heads at the centre exhaust valve area via a tube and fitting?
I like the dry decking myself, no chance of water in the cylinders.
Reverse cooling, well,it makes sense, cool water to the hot heads first, warmed water onwards to the cylinders. Much better for detonation resistance too,cooler heads. But each to their own.
How long does a race engine run? How hot does the water get? Do you monitor temp entering and exiting the head? Do you monitor water pressure via racepak and see the pressure increase vs temp? My exit water temp may be 110 degrees with the pressure being around 20psi. Again, there are better ways to cool a head.

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Old 01-14-2020, 08:40 PM
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Mike Kasparian,Sr. Mike Kasparian,Sr. is offline
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Has anybody else noticed the oil between the layers of a cometic gasket upon disassembly that hasn't been sprayed with cooper coat ? I think it probably migrates from heads following hd studs .

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  #26  
Old 01-14-2020, 09:35 PM
Scott Roberts Scott Roberts is offline
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How long does a race engine run? How hot does the water get? Do you monitor temp entering and exiting the head? Do you monitor water pressure via racepak and see the pressure increase vs temp? My exit water temp may be 110 degrees with the pressure being around 20psi. Again, there are better ways to cool a head.
Care to share your cooling setup John?
I'm sure its wizbang with years of R&D...
I say that in all seriousness...not actually being a smartass

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Old 01-14-2020, 10:50 PM
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Originally Posted by charlie66 View Post
I dont have a 6 cylinder . I have a 4 cylinder. Its half of a 389 v 8 engine . Im making 900 hp with 4 cylinders . Why would it not be apples to apples?? What does half of your motor make?? Its the same as half of YOUR engine but with a smaller bore and stroke. Theres alot going on in my cylinders. My head gasket would fit your engine . Its the same thing ..

I have a 461 on spray so how do i not know what im talking about ??

Also , Why dont you call Cometic and ask there tech guy if you should spray your gasket or not before you embarrass yourself more...

Have a great day ...
LOL.. Your a legend in your own mind... .. Carry on ...

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Old 01-14-2020, 11:52 PM
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Originally Posted by Dragncar View Post
Sure, I like to see it. 900HP out of 4 cylinders is actually amazing. Marty P was getting 1600HP out of his twin turbo 400. Not 1800 so 900 out of a 4banger is no small feat.
I don't know how much HP Marty made. But if he ran 6.95 @ 195 MPH @ 2950 lbs with 1600 HP he had a car that worked really well.

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330 Foot ET = 2.8820
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1/8 Mile MPH = 157.3389
1000 Foot ET = 5.7998
1/4 Mile ET = 6.9531
1/4 Mile MPH = 195.3238

Stan

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Old 01-14-2020, 11:54 PM
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LOL.. Your a legend in your own mind... .. Carry on ...
Mark,
Great technical response!

Stan

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  #30  
Old 01-15-2020, 07:02 AM
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Originally Posted by John Langer View Post
How long does a race engine run? How hot does the water get? Do you monitor temp entering and exiting the head? Do you monitor water pressure via racepak and see the pressure increase vs temp? My exit water temp may be 110 degrees with the pressure being around 20psi. Again, there are better ways to cool a head.
In my case, water temp around 100f, the drive through pits to staging lanes and track warms it to 140f, 8 seconds later after the run its up to 170-180f. Drive back from the run straight into the staging lanes and repeat -usually another 3-4 back to back runs gets it up to 200f ,so its back to the motor home for a cup of tea.
Water pressure in my dry deck/reverse cooled combo is controlled by using smaller diameter outlets at the block exits in the traditional manner. 55gpm electric pump. I've never seen a need to monitor water pressure via my Innovate (much cheaper than your Racepak) datalogger. Of course I just have a little 420 with factory heads and block, yours is much bigger.
You can't get cooler water to the heads than using it directly from the radiator,before it gets heated by the cylinders. Unless you pump it from a cold water tank. Internal water pressure may be an issue in your combo due to local hotspots, I don't know.
Have you ever used a dry deck/reverse cooled setup on your combo?
Mike, I had the oil migration on my solid copper head gaskets because I didn't spray them with a sealer, lesson learnt.

  #31  
Old 01-15-2020, 09:08 AM
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LOL.. Your a legend in your own mind... .. Carry on ...
Explain this one. I gave my opinion to the OP and you started in with me like you do with everyone here. My facts are my facts .. No need the tell me i have no clue about what i know. YOU KNOW NOTHING ABOUT ME!

Next time pass on by my post . Your just a bully and i dont like bullys...

Like i said last time. Have a great day...

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  #32  
Old 01-18-2020, 01:24 AM
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