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Chris: I think Ed has hit on what I would have suggested. The tip off is the higher static RPM you recored with the turbo removed. 29.8 is normal MP with a NA engine. Are you sure the Turbo is spinning up? If it is not that would be your restriction and hence lower MP and Static RPM. Can you manually spin with your finger. It should turn very easy(as I am sure you know). If that is the case you are in for a rocket ship ride when you get the turbo working:)

KIND REGARDS

Thomas Giddings

n360tg@earthlink.net

727 858 1772

On Aug 20, 2012, at 9:42 PM, Ed Anderson wrote:

Chris,

Exactly where are you taking your manifold pressure from-

I presume it is after the turbocharger compressor - somewhere between the turbo and the intake manifold OR at the manifold.

The only way I can make sense of your reading based on information provided thus far is that you are taking your manifold pressure reading before the turbocharger compressor inlet. Then the increased airflow caused by the turbocharger could cause the pressure drop before the compressor due to filter or other restriction.

Even if you have a restrictive filter, the pressure on the compressor outlet side of the turbo, the turbocharger on pressure in your manifold should be higher than without the turbo.

You are not spinning your turbo backwards are you?{:>)

Ed
--------------------------------------------------
From: "Chris Barber" <cbarber@texasattorney.net>
Sent: Monday, August 20, 2012 9:17 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Turbo question.

As I have mentioned I have had what I think are incongruent readings regarding my manifold pressure (mp)and engine rpm. It seems I am getting quite low mp as I add power to higher rpm.

I am not well versed in this area but my thought is that as I add power, even with slight boost (currently using a 3 lb spring in my wastegate) eventually my mp should raise a bit more.

Today I did some static test. I recorded engine RPM with the turbo hooked up and recorded the mp at 1000 rpm increments. Then I removed the turbo plumbing from my intake and recorded the same info My results currently confuse me.

With the turbo hooked up I am getting

RPM. MP inches
2000 - 14.0
3000 - 15.5
4000 - 19.3
5000 - 21.6
5700 - 24.5 (topped out)

With the turbo removed.

2000 - 15.8
3000 - 15.3
4000 - 19.7
5000 - 24.8
5833 - 29.8

Is this indicative of restriction in my plumbing? Perhaps in the inter cooler? A dirty air filter? A bad pop off valve or a leak not allowing the air pressure getting to the intake. Or????

I am uncertain what other permitters I need to check and provide. I am just starting my diagnosis in my Phase One testing. I only have 1.6 hours in the air so far. I value ya'll's direction and input.

Heck, perhaps this is working properly but it just doesn't seem right/comfortable.

Thanks folks.

Chris Barber
Houston
Velocity SE
Rotary 13b turbo (?) :-)

Sent from my iPhone 4
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