X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 13 May 2014 07:45:06 -0400 Message-ID: X-Original-Return-Path: Received: from nm23-vm1.bullet.mail.bf1.yahoo.com ([98.139.213.141] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTPS id 6869553 for lml@lancaironline.net; Mon, 12 May 2014 14:37:35 -0400 Received-SPF: pass receiver=logan.com; client-ip=98.139.213.141; envelope-from=chris_zavatson@yahoo.com Received: from [66.196.81.174] by nm23.bullet.mail.bf1.yahoo.com with NNFMP; 12 May 2014 18:37:00 -0000 Received: from [98.139.212.197] by tm20.bullet.mail.bf1.yahoo.com with NNFMP; 12 May 2014 18:37:00 -0000 Received: from [127.0.0.1] by omp1006.mail.bf1.yahoo.com with NNFMP; 12 May 2014 18:37:00 -0000 X-Yahoo-Newman-Property: ymail-3 X-Yahoo-Newman-Id: 17281.48059.bm@omp1006.mail.bf1.yahoo.com Received: (qmail 90037 invoked by uid 60001); 12 May 2014 18:36:59 -0000 X-YMail-OSG: 4XvaNuEVM1lH5K1G4BeBEQlQO.1GMysm_dh1zesTTLgdgry Ohc2kxvxBuY5xcFtUCdIfBtbucD9KpSLHvYeQCeo.Uw_bH9uRylxA2K7vKkE Nwbev29ySiLfEdyGlB0j02WjeMTuxuhXdul0e30SJeB8J_IhiLvYmg6E6org uc9N2EdojSFxir4i1cHXRrkSmSV4QHBquOo.TxdunpLDw958NK3UwnfwUU2j EUdKnInRRdE9A69GWrsgLD60OIX2vAld8S0Rp97HpUzF9Tar.YoBtKVYMl7l TQKH9TF6JwdBxAqiElPiVmBcHvVuZoz5q7v_1VQRv21QstZ8GTItsR8gGroP kKwLRZvGxZZSvHPObT7bD1J4Ynda_dbR7NfEK86NNthyvf8H_N3v.JtPpu2o 9VBzKms.t3lnS.QOwnGpjv1IU6zsUHpuBmRqdRKqba.2nDYb4k6xUDOEX5J. HK7URs8wKO_OjfBk4cu6DkFr_SbQlu5_HM_L02iPcPB4.fvAFnB2Mw1SCkrl Ib0gRa14BAtT1tZIDfyb0Iiys2pscI5Tg.BW1zZePJRBFo1rcLkVA.lklPaT C3.tNEmxOrbjbxCGY6r0E9MQTeXOVsHCwROBlOl5LLArEKB.JAbUNAHzwlm8 4K5awxXyn5Yv58HClC3vVAbbiR7av.cCGen9OsgWSGqQXbvWn6zsKV5Lvs37 LSCt4.RLKMw7ogzrbCub5RR.5 Received: from [172.14.16.72] by web161203.mail.bf1.yahoo.com via HTTP; Mon, 12 May 2014 11:36:59 PDT X-Rocket-MIMEInfo: 002.001,QmlsbCwKSXMgdGhhdCBhIG5ldyBlbmdpbmU_IC1sb29rcyBzcG90bGVzcy4KU2NvdHQgS3J1ZWdlciB3YXMgYWxzbyBhYmxlIHRvIGdldCBhIHJlYWxseSBnb29kIHNlYWwgb24gaGlzIGJhZmZsZXMuwqAgSW4gZmFjdCwgaGUgaGFkIHRoZSBoaWdoZXN0IG1lYXN1cmVkIHByZXNzdXJlIHJlY292ZXJ5IEkgaGF2ZSBzZWVuIHVzaW5nIGZsZXhpYmxlIGJhZmZsZSBtYXRlcmlhbC7CoCBZb3Ugd291bGRuJ3QgaGFwcGVuIHRvIGhhdmUgKG9yIGJlIGludGVyZXN0ZWQgaW4gbWVhc3VyaW5nKSBzb21lIHVwcGVyIHABMAEBAQE- X-Mailer: YahooMailWebService/0.8.188.663 References: X-Original-Message-ID: <1399919819.40782.YahooMailNeo@web161203.mail.bf1.yahoo.com> X-Original-Date: Mon, 12 May 2014 11:36:59 -0700 (PDT) From: Chris Zavatson Reply-To: Chris Zavatson Subject: Re: [LML] Cooler CHTs X-Original-To: Lancair Mailing List In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-852950040-140086076-1399919819=:40782" ---852950040-140086076-1399919819=:40782 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable Bill,=0AIs that a new engine? -looks spotless.=0AScott Krueger was also abl= e to get a really good seal on his baffles.=A0 In fact, he had the highest = measured pressure recovery I have seen using flexible baffle material.=A0 Y= ou wouldn't happen to have (or be interested in measuring) some upper plenu= m pressures for comparison?=A0=A0-forever in search of cooling system data.= =0AHow do you interface to the inlets? -any pics of that area?=0Athanks,=0A= Chris Zavatson=0AN91CZ=0A360std=0Awww.N91CZ.net=0AOn Monday, May 12, 2014 4= :46 AM, William Rumburg wrote:=0A =0A =0AI mainta= in that the conventional baffling structure, which has=A0a =0Awell-executed= flexible seal=A0at the upper cowl=A0and a form-fitting seal =0Aat the cool= ing air inlets, can=A0be=A0almost as effective as a plenum. The =0Agap to t= he upper cowl=A0must be uniform, not less than 3/4 inch or much =0Agreater = than 1 inch. It should, ideally, be 1 inch all around. My =0ALancair-suppli= ed baffling=A0had too much gap at=A0the right rear cowl, and =0Atoo little= =A0at the=A0left rear, because the engine is slightly rotated =0Awith respe= ct to the cowl.=A0In addition, a major=A0shortcoming=A0of the =0ALancair-su= pplied baffling is=A0that it leaves a=A0WIDE gap at =0Athe=A0cooling air in= lets, with builders doing little more than adding some =0Aloosely-fitting,= =A0ineffective=A0seal there. It wasn't too difficult to =0Acorrect both of = these conditions and add some other enhancements, which =0Aresulting in low= ering my cruising CHT's by 40 degrees, from 360-380 to 320-340. =0AAs seen= in the photos,=A0I added a 1 inch wide=A0aluminum strip =0Aacross the fron= t, easily cut from a cardboard template. That not only =0Atransformed the= =A0baffling=A0into a rectangular box, making it easier to =0Aseal, but allo= wed for the addition of custom fiberglass seals at the air inlets. =0AI for= med those by trimming a block of foam to the required shape and overlaying = =0Awith duct tape for release.=A0Their circular holes match the air inlets,= with =0Aonly 1/8 inch gap to the cowl.=A0In addition, I re-cut both of baf= fling side =0Apieces to their correct heights, utilizing .050 inch thick al= uminum, and made =0Acustom=A01 inch-high inner pieces -also easily cut from= cardboard templates- =0Aso as to 'sandwich' the flex seals, further decrea= sing air leakage.=A0I =0Acarefully=A0cut all seals to the correct height an= d shape=A0and feel that =0AI've obtained=A0a nearly 100% seal. I also reduc= ed airflow =0Awasted=A0through engine areas other than the cylinder heads. = =0A=0ABill Rumburg =0AN403WR (Sonic bOOm)=0A--=0AFor archives and unsub htt= p://mail.lancaironline.net:81/lists/lml/List.html ---852950040-140086076-1399919819=:40782 Content-Type: text/html; charset=iso-8859-1 Content-Transfer-Encoding: quoted-printable
Bill,
Is that a new engine? -looks spotless.
Scott Krueger was also able to get a really good seal on = his baffles.  In fact, he had the highest measured pressure recovery I= have seen using flexible baffle material.  You wouldn't happen to hav= e (or be interested in measuring) some upper plenum pressures for compariso= n?  -forever in search of cooling system data.
How do you interface to the inlets? -any pics of that area?
thanks,
Chris Zavatso= n
N91CZ
360std
www.N91CZ.net
On Monday,= May 12, 2014 4:46 AM, William Rumburg <lancair403@verizon.net> wrote= :
=0A=0A =0A =0A=0A=0A
=0A
I maintain that the con= ventional baffling structure, which has a =0Awell-executed flexible se= al at the upper cowl and a form-fitting seal =0Aat the cooling ai= r inlets, can be almost as effective as a plenum. The =0Agap to t= he upper cowl must be uniform, not less than 3/4 inch or much =0Agreat= er than 1 inch. It should, ideally, be 1 inch all around. My =0ALancair-sup= plied baffling had too much gap at the right rear cowl, and =0Ato= o little at the left rear, because the engine is slightly rotated= =0Awith respect to the cowl. In addition, a major shortcoming&nb= sp;of the =0ALancair-supplied baffling is that it leaves a WIDE g= ap at =0Athe cooling air inlets, with builders doing little more than = adding some =0Aloosely-fitting, ineffective seal there. It wasn't= too difficult to =0Acorrect both of these conditions and add some other en= hancements, which =0Aresulting in lowering my cruising CHT's by 40 degrees,= from 360-380 to 320-340. =0A
=0A
As seen in the photos, I ad= ded a 1 inch wide aluminum strip =0Aacross the front, easily cut from = a cardboard template. That not only =0Atransformed the baffling i= nto a rectangular box, making it easier to =0Aseal, but allowed for the add= ition of custom fiberglass seals at the air inlets. =0AI formed those by tr= imming a block of foam to the required shape and overlaying =0Awith duct ta= pe for release. Their circular holes match the air inlets, with =0Aonl= y 1/8 inch gap to the cowl. In addition, I re-cut both of baffling sid= e =0Apieces to their correct heights, utilizing .050 inch thick aluminum, a= nd made =0Acustom 1 inch-high inner pieces -also easily cut from cardb= oard templates- =0Aso as to 'sandwich' the flex seals, further decreasing a= ir leakage. I =0Acarefully cut all seals to the correct height an= d shape and feel that =0AI've obtained a nearly 100% seal. I also= reduced airflow =0Awasted through engine areas other than the cylinde= r heads.
=0A
 
=0A
Bill Rumburg
=0A
N403WR = (Sonic bOOm)

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