Return-Path: Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 245102 for flyrotary@lancaironline.net; Tue, 06 Jul 2004 16:28:34 -0400 Received: from JSLADE ([216.76.208.182]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with SMTP id <20040706202758.IMIY1776.imf21aec.mail.bellsouth.net@JSLADE> for ; Tue, 6 Jul 2004 16:27:58 -0400 From: "John Slade" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Second stock turbo bites the dust Date: Tue, 6 Jul 2004 16:27:55 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01C46376.316B8FC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C46376.316B8FC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Hi Ed, Thanks for the analysis. > Sorry to hear about blowing another turbo, John. I'm doing this destructive testing for the sake of all. The other guys will now all chip in and buy me a new one. Right??? Yea. I thought not. :( > overheating the unit which would eventually lead to the turbine/compressor wheels failing. That's what I think happened. >the stock waste gate has trouble venting enough exhaust gas. That's for sure. I had the wastegate fully open and was limiting boost by throttle. I have Rusty's pop off valve set around 8-10 PSI, and I also have a half inch bleed from the intercooler which probably dumps a lot of pressure too. Better to have a decent wastegate and give the turbo a break. You have not mentioned any problem holding the boost under control, so the problem could be more due to a continuos heat load Yes. There was no sign of creep or surge. It was steady at 38 MAP for over an hour. A nudge of the throttle and it would go up or down a couple of inches smoothly. The compressor map didn't come through, but I've seen them and know what you mean. A different turbine housing with an larger A/r and external waste gate (and now we are starting to talk additional weight) OR the modification offered by the Australian firm opening up the turbine housing as well as the internal exhaust gate port would be something I would strongly consider. That's my next call. I like having a lot of power, so I'm not "doing a Rusty" and chickening out. :) I never hear it Richard? from Blue Mountain Instruments? ever had any trouble with this turbo unit. I forget which one it was, but it was not the stock Mazda. You mean Greg Richter. No he didn't report any problems. It was a custom designed Turbonetics T04. He sold it when he took the engine off and put the jet in. I wish I'd bought it. Ah well. We live and learn, and yet another Lamar recommendation goes in the trash can. :) Thanks for the input. John ------=_NextPart_000_0017_01C46376.316B8FC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Hi=20 Ed,

Thanks=20 for the analysis.

> Sorry to hear about blowing = another turbo,=20 John.

I'm doing this destructive testing for the sake = of all. The=20 other guys will now all chip in and = buy me a new=20 one. Right??? Yea. I thought not. = :(

> overheating the unit which would = eventually lead to the turbine/compressor wheels failing.

That's what I think=20 happened.

>the stock = waste gate=20 has trouble venting enough exhaust gas.

That's for sure. I had the wastegate fully = open and was=20 limiting boost by throttle. I have Rusty's pop off valve set around 8-10 = PSI,=20 and I also have a half inch bleed from the intercooler which probably = dumps a=20 lot of pressure too. Better to have a decent wastegate and give the = turbo a=20 break.

You have not mentioned any = problem=20 holding the boost under control, so the problem could be more due to a = continuos=20 heat load

Yes. There was no sign of creep or surge. It was steady = at 38 MAP=20 for over an hour. A nudge of the throttle and it would go up or down a = couple of=20 inches smoothly. The compressor map didn't come through, but I've seen = them and=20 know what you mean.

A different turbine housing with = an larger=20 A/r and external waste gate (and now we are starting to talk additional=20 weight) OR the modification offered by the Australian firm opening = up the=20 turbine housing as well as the internal exhaust gate port would be = something I=20 would strongly consider.

That's=20 my next call. I like having a lot of power, so I'm not "doing a = Rusty" and=20 chickening out. :)

I never hear it Richard? from Blue = Mountain=20 Instruments? ever had any trouble with this turbo unit. =

I forget which one it was, but it was = not the stock=20 Mazda.

You mean = Greg Richter. No he didn't report any problems. It = was a=20 custom designed Turbonetics T04. He sold it when he took the = engine off=20 and put the jet in. I wish I'd bought = it.

Ah well. We live and learn, and yet another = Lamar=20 recommendation goes in the trash can. = :)

Thanks for the = input.

John

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