Return-Path: Received: from smtp4.mindspring.com ([207.69.200.64]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Mon, 22 Mar 1999 17:56:15 -0500 Received: from triton (user-38h1sv0.dialup.mindspring.com [209.16.243.224]) by smtp4.mindspring.com (8.8.5/8.8.5) with SMTP id RAA10494 for ; Mon, 22 Mar 1999 17:58:16 -0500 (EST) Message-ID: <003801be74b7$1aa59910$0113a8c0@triton> From: "Brock Brinkerhoff" To: Subject: O-290-D2 Compression Date: Mon, 22 Mar 1999 16:55:38 -0600 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Does anyone out there run an O-290-D2 in a 235? My question relates to all of the conflicting information I get about compression ratio and fuel. I am told that the compression should be raised to 9:1 in order to burn 100LL without the valve problems. Has anyone heard of this happening? The engine shop that is redoing my motor has told me that this is untrue, and about the only thing I would have to stay on top of is the plugs (every 50 hours or so). Brock Brinkerhoff 290DM