X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao103.cox.net ([68.230.241.43] verified) by logan.com (CommuniGate Pro SMTP 5.2.10) with ESMTP id 3306564 for flyrotary@lancaironline.net; Tue, 18 Nov 2008 18:10:50 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.43; envelope-from=dale.r@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao103.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20081118231004.MJJ15019.fed1rmmtao103.cox.net@fed1rmimpo01.cox.net> for ; Tue, 18 Nov 2008 18:10:04 -0500 Received: from [192.168.1.101] ([72.223.7.60]) by fed1rmimpo01.cox.net with bizsmtp id gnA41a0041HijaY03nA4ni; Tue, 18 Nov 2008 18:10:04 -0500 X-Authority-Analysis: v=1.0 c=1 a=LhvaK7p7WYgcn1xQcqkA:9 a=BT0Y5Y5NQVd1cpTlO_rJXoGW_84A:4 a=si9q_4b84H0A:10 a=qiz_C0Y06xkA:10 X-CM-Score: 0.00 Message-ID: <49234B49.4050808@cox.net> Date: Tue, 18 Nov 2008 16:10:01 -0700 From: Dale Rogers User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] bolt depth References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit kevin lane wrote: > I am bolting homemade parts to my block and wanted to know any rule of > thumb for how deep a bolt has to be. does an 8mm bolt need 8mm of > thread depth? a certain number of threads? are socket head bolts as > strong as hex, at least for the intake/exhaust manifolds? when do I > use lock washers? I always wondered why Lycoming engine case halves > never had lockwashers and used std (not fine)threads.(at least mine > came that way) kevin n3773@comcast.net General rule of thumb, for maximum strength of the connection - steel: 1-1/2 times the diameter of the bolt/stud; aluminum: 2 times the diameter. Dale R.