Dave,
I see no reason why your "proposed system" shouldn't work, provided you can get the wp to prime.  It is very close to my system, which does work.  One caveat, be sure to bleed the air from the radiator and wp cavity.

Mark S.


At 09:46 AM 4/9/2004 -0700, you wrote:

OK, I finally got around to making some drawings so it is a little easier to discuss.  When I was saying surge tank was probably meaning purge or expansion tank.  Omitted from the drawing is the connection to the turbo which returns to the lower part of the Rad, and the purge opening I have at the pump outlet for filling the system.  I also have a purge screw at the top of the rad to remove any bits of air which may accumulate there. 

 

From the discussion so far, it sounds like I need some more continuous flow through the vent system so I have attached a drawing of my proposed changes, submitted for your [dis]approval.

 

Several of you have mentioned tests having to do with a garden hose.  Great Ideas but I have no access to a hose at the airport that I know of.

 

Based on all the input so far, I am also doing the following:

1)  Drill or tap a vent hole to allow the old thermostat bypass passage to fill with coolant.

2)  Flush out the Rad and make sure it free-flows.

3) Flush out all the hoses to make sure they free flow.

4) Modify the system to match the attached drawing.

5) Inspect the impeller clearance for excessive gap (compared to the gap on my stock water pump).

6) Burp and re purge the high points of the engine at least 6-7 times before doing any high power runs, and only if I find the rad is finally getting warm when it runs.

7) Install the TES inner coolant o-rings.

8) Weld over the EGR passage (I found that the clay I used got pushed aside after only 30 min of run time).  This is the most likely cause of me being too lean in rotor 1 and the reason why I can t idle well.

 

Lastly, I want to take a poll.  I know there is no right answer so I am looking for everybody s opinion.  While I have the engine apart I am considering replacing the 9.0:1 turbo rotors with the higher compression 9.7:1 n.a. rotors, even thought I still plan to run the turbo.  I understand that I may will to limit the boost more (but where I don t know).  I see the advantages as slightly better fuel economy and needing to run less boost to achieve the same h.p.  The disadvantages are cost and possibly playing with detonation in areas that are not well tested.  Any other considerations?  Opinions?  Suggestions on boost limits with each type of fuel (ie. 87 vs. 91 vs. 100LL)?

 

Thanks for everyone s help with this cooling issue.  I never could have taken on this project without everyone s help.

 

David (just started 2 weeks of vacation) Leonard

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-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Thursday, April 08, 2004 9:24 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Dave's pump problems

 

> MessageThis may have already been suggested, but where did you run the block vent from the top of flywheel end of engine?  Should be connected to high point of cooling system.

>

> Tracy

>

 

That vent is my only vent from the system.  It goes to a small surge can with a 16 psi cap which vent to 2 larger pressurized cans on the firewall.

 

Dave Leonard

 

Unless I misunderstand (I remember this happening once J) this is like no vent at all; unless the cap is off the surge tank.  Yeah, I know you know that, but we re kind of out in space here trying to figure something out.  It seems that without a vent at the exit from the pump there will be some air trapped in the pump no? 

 

A nice way to put in a vent at the pump outlet is to install an AN plug with an o-ring seal.  Drill into the bottom of the plug, and then right angle to the side just below the o-ring.  Back off the plug a couple of turns when you fill to bleed air, tighten it down to run.  (Photo attached)  I have a second one that has a shrader (sp?) valve welded into it so if I need to pressure test the system, I can just swap plugs.

 

Al


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