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-   -   SVX Engine cooling "Again & Again" (https://www.subaru-svx.net/forum/showthread.php?t=51702)

Dessertrunner 09-16-2009 04:41 PM

SVX Engine cooling "Again & Again"
 
Okay guys I am going to be a pain in the A__ and stat this all over again. My reason is that at this time I don't know anywere in the world that someone has an SVX engine that stays cool at high revs. Right now we have blown 1 engine due to heat and my friend Steve with the buggy has blown 2. If we asked around I am sure the total will be over 10 engine that have either been blown completly or just head gaskets.

What I have found recently is the following:-
- Multiple pass radiator "DID NOT" slove the problem.
- A bigger Radiator "DID NOT" slove the problem (buggy radiator is 3 times bigger then my PBR).
- During the recent desert crossing I notice on my 3 tempreture guages that the water going into the top of the radiator was at 90C the water coming out of the radiator was at 70C but the dash temp was overheating, above 115C. Didn't check at the time but after noticed cool had spillied from the overflow tank.

So the big question is what do we now know.
The only way my over heating issue can happen is that the left head was overheating as that is were dash & ECU temp guage is. It is also possiable that is the water boiled in the left head the pressure would go up and would cause the coolent to overflow. This can still happen when the radiator is cool because tempreture and pressure behave differently.

Now we are cutting the cross pipe and will post photos of the job in the next couple of days.

Will keep you posted.
Tony

michael 09-16-2009 05:00 PM

Re: SVX Engine cooling "Again & Again"
 
This may sound stupid but have you tried water wetter?

Dessertrunner 09-16-2009 05:49 PM

Re: SVX Engine cooling "Again & Again"
 
Not sure that it will help with cooling but if you can explain how I would appricate it.
Tony

SilverSpear 09-16-2009 05:53 PM

Re: SVX Engine cooling "Again & Again"
 
Water Wetter? Is that it?

I guess the overheating EG33 problem under an extreme condition outweighs by far the issue of adding a coolant.

Something has to be made concerning the issue of boiling water in the block.

michael 09-16-2009 06:04 PM

Re: SVX Engine cooling "Again & Again"
 
This one http://www.redlineoil.com/product.aspx?pid=74&pcid=10
Only reason I would ever suggest it is because of the quality and experience I have had with their other products. If it can lower the temps 20 degrees that is nothing to sneeze at.

SilverSpear 09-16-2009 06:14 PM

Re: SVX Engine cooling "Again & Again"
 
Michael, this product might be great and all, but I don't think anyone doing boost or high profile N/A would bet on the reliability of his +$6000 setup over a $10 bottle of coolant.

That might be added to tapping or whatever enhancement is done in the cooling process.

We will be waiting on Tony and Tom's project developments to see what they would come up with.

michael 09-16-2009 06:23 PM

Re: SVX Engine cooling "Again & Again"
 
I agree, just thought it might be something to experiment with. I'm not going to pretend I know what I'm talking about on this subject.

Wikedjuggalo 09-16-2009 06:37 PM

Re: SVX Engine cooling "Again & Again"
 
Wasn't their discussion somewhere of a issue with the cooling channels with in the block. Specifically the back of the block boiling the coolant almost? IT had to do with a forced injection but could possible be an issue for you?

Trevor 09-16-2009 07:29 PM

Re: SVX Engine cooling "Again & Again"
 
Quote:

Originally Posted by Dessertrunner (Post 617864)
My reason is that at this time I don't know anywere in the world that someone has an SVX engine that stays cool at high revs.
What I have found recently is the following:-
- Multiple pass radiator "DID NOT" slove the problem.
- A bigger Radiator "DID NOT" slove the problem (buggy radiator is 3 times bigger then my PBR).

So the big question is what do we now know.
The only way my over heating issue can happen is that the left head was overheating as that is were dash & ECU temp guage is.

Will keep you posted. Tony

Tony, trying to apply some crude logic to your previous results.

Engine and therefore pump speed, is a deciding factor according to recorded fact. I have previously mentioned speed of water flow and others have suggested possible impeller cavitation. As far as I am aware this factor has not been properly tested, whereas there is every reason to suspect this as an issue.

Reducing the pump efficiency is not difficult and involves at the worst, only the cost of a used component. The time honoured method is to drill substantial holes through the rotors.

You appear to have concluded that only the left head is overheating, but it can not be concluded that this is confined to the particular area of the engine associated with the sensors. :confused:

Speak to some old timers who have used the flat head Ford V8 for racing.;)

You have the fortitude and will find the answer, Trevor.

SomethingElse 09-16-2009 08:09 PM

Re: SVX Engine cooling "Again & Again"
 
Quote:

Originally Posted by Trevor (Post 617899)
Reducing the pump efficiency is not difficult and involves at the worst, only the cost of a used component. The time honoured method is to drill substantial holes through the rotors.

Would you suggest drilling every impeller? or every other one?

TomsSVX 09-16-2009 08:19 PM

Re: SVX Engine cooling "Again & Again"
 
I have been granted permission to run a test on Shotgunslade's engine. I have modified the X-over manifold for the water outlet. I am going to run this modification alone w/o the aux. cooling ports in the heads to find out if this is helping the overheating issues by itself. If not, I will hook up the aux. cooling ports and work from there. After seeing the minuscule volume of the inside of the manifold I can only imagine that the flow through it is limited and I would imagine the limit is right around 6500 engine RPMS and thus the high RPM engines that are experiencing the issues. Lets see what we find and work from there.

I can honestly say that impeding the flow is not going to help anything except allowing it to overheat on both sides of the engine rather than just the one restricted at this point

Tom

Dessertrunner 09-16-2009 08:32 PM

Re: SVX Engine cooling "Again & Again"
 
Trevor,
I am to dumb to have concluded or come up with the idea its the left bank I have only comfirmed it as highly likly. The info that supports this argument are that the newer 6 cylinder Subarus have 2 return pipes to the radiator making me think they found the left bank wasn't getting enough cooling. Second a UK rally guy sent my buggy friend a photo of how they have moded the top pipe on the 4 cylinder so the water flows more evenly from the heads because they had been killing engines on the left bank.
Tony

Dessertrunner 09-16-2009 09:25 PM

Re: SVX Engine cooling "Again & Again"
 
1 Attachment(s)
Cooling pipe that we are modify, Tom suggestion.
Tony

TomsSVX 09-16-2009 09:46 PM

Re: SVX Engine cooling "Again & Again"
 
http://i65.photobucket.com/albums/h2...906091503a.jpg

Tom

Dessertrunner 09-16-2009 10:00 PM

Re: SVX Engine cooling "Again & Again"
 
Nice job Tom, have you blocked the heater pipe etc that return to the pump?
Tony


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