X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost01.isp.att.net ([204.127.217.101] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3325357 for flyrotary@lancaironline.net; Mon, 01 Dec 2008 12:51:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=204.127.217.101; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-152-230-195.mco.bellsouth.net[70.152.230.195]) by isp.att.net (frfwmhc01) with SMTP id <20081201175053H0100t3gjme>; Mon, 1 Dec 2008 17:50:54 +0000 X-Originating-IP: [70.152.230.195] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Front Nut, Thermostat and Coolant Intake hose was : [FlyRotary] Re: Hot first flight Date: Mon, 1 Dec 2008 12:50:54 -0500 Message-ID: <561B34910A6A4CB5BC7A1531600FB750@Desktop> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0000_01C953B3.7325AC70" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AclT2EOpqJPqLmA7QvGBinFTwq0hmwABJy4g X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_0000_01C953B3.7325AC70 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Jeff, my alternator guy just holds the pulley with his left hand and = hits the nut with an impact wrench and it spins right off. It is right hand threads though=85.lefty tighty, righty loosey! If you discover that my alternator guy has a really strong left hand, = you can use Lynn=92s suggestion of a strap wrench.. :>) =20 Bill B=20 =20 _____ =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jeff Whaley Sent: Monday, December 01, 2008 12:14 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Front Nut, Thermostat and Coolant Intake hose = was : [FlyRotary] Re: Hot first flight Hi Ed, I don=92t want to change the main e-shaft pulley =85 I was = thinking of changing the ALTERNATOR double-groove pulley =85 the belt got jammed in = the alternator pulley; the alternator and top cowling were powdered with = rubber residue. Jeff =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Monday, December 01, 2008 11:58 AM To: Rotary motors in aircraft Subject: [FlyRotary] Front Nut, Thermostat and Coolant Intake hose was : [FlyRotary] Re: Hot first flight =20 FONT NUT CAUTION =20 Jeff, as Tracy mentioned =96 delay changing the main pulley until a bit = later (unless its clear there is a defect in it) because if you DO let the = thrust bearing slip off its shoulder on the E shaft =96 it=92s a minimum of = taking the front cover off the engine (next to firewall) to get to it. In most = cases, due to limited space under the cowl and motor mounts, you end up taking = the engine off the aircraft. That=92s not fun any time and I imagine even = less so with temps in the 30F range. =20 BUT, if you decide you HAVE to replace the main pulley without removing = the engine, here is a suggestion. =20 Raise the tail of your aircraft as high in the air as you safely can. = This will tend to keep the thrust bearing toward the rear of the engine = (front of aircraft) where it rests against a spacer. That way the shock of an = impact wrench will not have as much tendency to =93walk=94 the bearing forward = and off its shoulder. No guarantee it won=92t get out of position =96 just a = bit less likely - than if the nose is up. =20 There are some instructions in the Mazda manual or somewhere that tells = you how to determine if the thrust bearing has falling out of position by = taking some measurements based on how far you can get the pulley nut back on = the shaft =96 but, I can=92t recall at the moment where they and you = really don=92t want to go there at this time in any case. =20 THERMOSTAT =20 I believe I read about the loss of efficiency by leaving out the plug in = one of Racing Beat=92s old technical catalogs and I am fairly certain they mentioned 20%. Well, I looked in one of their old catalogs and while I = did not find a specific percentage mentioned (at least in my quick search), = this is a quote from them: Quote :=20 =93 7. Mazda=92s water thermostat is a =93by-pass=94 type (apparently = referring to the =BD=94 by-pass hole). Therefore, if it is removed for racing, = the hole below it MUST be plugged=85=85 =85 NOTE: The thermostat should be removed and the bypass plugged for = racing. Do not use restrictors in the system. Free Flow is best. =20 =93 RADIATOR INTAKE HOSE =20 Another thing Racing Beat cautions about - is making certain that the radiator hose on the suction side is the type that has a spring coiled = in side or is otherwise stiff enough to resist collapsing under the suction = of the water pump. If that happens, of courses, your coolant flowed is seriously impeded. =20 The hose may be able to resist the suction at idle or low rpm, but may = not at the higher rpm. If you squeeze the hose and can deform it with your hand pressure , then it is likely too flimsy to serve as the radiator = hose on the intake side of the pump. =20 You are 99% there, Jeff. So no rash action, just take it one step at a = time {:>) =96 easy for me to say. Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com http://www.andersonee.com http://members.cox.net/rogersda/rotary/configs.htm#N494BW http://www.dmack.net/mazda/index.html ------=_NextPart_000_0000_01C953B3.7325AC70 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Jeff, my alternator guy just holds the pulley with his left hand = and hits the nut with an impact wrench and it spins right off.=A0 It is = right hand threads though….lefty tighty, righty = loosey!

If you discover that my alternator guy has a really strong left = hand, you can use Lynn’s suggestion of a strap wrench..=A0 :>)

 

Bill B 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Jeff Whaley
Sent: Monday, December = 01, 2008 12:14 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: = Front Nut, Thermostat and Coolant Intake hose was : [FlyRotary] Re: Hot first = flight

Hi Ed, I = don’t want to change the main e-shaft pulley … I was thinking of = changing the ALTERNATOR double-groove pulley … the belt got jammed in the = alternator pulley; the alternator and top cowling were powdered with rubber = residue.

Jeff

 <= /o:p>

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Monday, December = 01, 2008 11:58 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] = Front Nut, Thermostat and Coolant Intake hose was : [FlyRotary] Re: Hot first = flight

 

= FONT NUT CAUTION

 

Jeff, as Tracy mentioned – = delay changing the main pulley until a bit later (unless its clear there is a = defect in it) because if you DO let the thrust bearing slip off its shoulder on = the E shaft – it’s a minimum of taking the front cover off the = engine (next to firewall) to get to it.  In most cases, due to limited = space under the cowl and motor mounts, you end up taking the engine off the aircraft.  That’s not fun any time and I imagine even less so = with temps in the 30F range.

 

BUT, if you decide you HAVE to = replace the main pulley without removing the engine, here is a = suggestion.

 

Raise the tail of your aircraft as = high in the air as you safely can.  This will tend to keep the thrust = bearing toward the rear of the engine (front of aircraft) where it rests against = a spacer.  That way the shock of an impact wrench will not have as = much tendency to “walk” the bearing forward and off its = shoulder.  No guarantee it won’t get out of position – just a bit less = likely - than if the nose is up.

 

There are some instructions in the = Mazda manual or somewhere that tells you how to determine if the thrust = bearing has falling out of position by taking some measurements based on how far you = can get the pulley nut back on the shaft  – but, I can’t  recall  at the moment where they and you really don’t = want to go there at this time in any case.

 

THERMOSTAT

 

I believe I read about the loss of efficiency by leaving out the plug in one of Racing Beat’s old = technical catalogs and I am fairly certain they mentioned 20%.  Well, I = looked in one of their old catalogs and while I did not find a specific percentage mentioned (at least in my quick search), this is a quote from = them:

Quote : =

“

=

7.       = Mazda’s water thermostat is a “by-pass” = type (apparently referring to the =BD” by-pass =  hole).  Therefore, if it is removed for racing, the hole = below it MUST be plugged……

… NOTE:  The thermostat should be removed and the bypass plugged for racing.  Do not use restrictors = in the system.  Free Flow is best.

 =

“

=

RADIATOR INTAKE HOSE

 

Another thing Racing Beat cautions = about - is making certain that the radiator hose on the suction side is the type = that has a spring coiled in side or is otherwise stiff enough to resist = collapsing under the suction of the water pump.  If that happens, of courses, = your coolant flowed is seriously impeded.

 

The hose may be able to resist the = suction at idle or low rpm, but may not at the higher rpm.  If you squeeze = the hose and can  deform it with your hand pressure , then it is likely = too flimsy to serve as the radiator hose on the intake side of the = pump.

 

You are 99% there, Jeff.  So = no rash action, just take it one step at a time {:>) – easy for me to = say.

Ed Anderson

Rv-6A N494BW Rotary = Powered

Matthews, NC

eanderson@carolina.rr.com=

http://www.andersonee.com

http://members.cox.net/rogersda/rotary/configs.htm#N494BW

http://www.dmack.net/mazda/index.html<= font size=3D2 face=3DArial>

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