---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Thu 08/30/12: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 09:50 AM - Choke-free Cylinders (Bernard Despins) 2. 10:05 AM - Re: Choke-free Cylinders (Monty Barrett Sr) 3. 11:02 AM - Re: Choke-free Cylinders (Tim Andres) 4. 02:18 PM - Re: Choke-free Cylinders (Kelly McMullen) ________________________________ Message 1 _____________________________________ Time: 09:50:07 AM PST US From: Bernard Despins Subject: Engines-List: Choke-free Cylinders Does anybody have any experience with straight bore aircraft cylinders? I came upon this website that seems to be all for it: http://www.chuckneyent.com/cylinderoverhaul.asp Bernard Despins ________________________________ Message 2 _____________________________________ Time: 10:05:02 AM PST US Subject: RE: Engines-List: Choke-free Cylinders From: "Monty Barrett Sr" All the Jacobs cylinders are straight walled barrels. The " choke " gets in the barrel when the head is screwed on at manufacturing and is caused by the interference fit between the barrel thread and the thread in the head. Theoretically, when the engine is up to operating temperature a choked barrel is straight. This is the likely reason for minimum in flight cylinder head temperatures recimmended by almost all the manufacturers. I looked up the website. I want to see the data on the 15-45 more horsepower. I think that's B.S. until I see some substantiating data. Monty Barrett Barrett Precision Engines, Inc. -----Original Message----- From: owner-engines-list-server@matronics.com [mailto:owner-engines-list-server@matronics.com] On Behalf Of Bernard Despins Sent: Thursday, August 30, 2012 11:49 AM Subject: Engines-List: Choke-free Cylinders --> Does anybody have any experience with straight bore aircraft cylinders? I came upon this website that seems to be all for it: http://www.chuckneyent.com/cylinderoverhaul.asp Bernard Despins ________________________________ Message 3 _____________________________________ Time: 11:02:06 AM PST US Subject: Re: Engines-List: Choke-free Cylinders From: Tim Andres There's a few threads on it over at VAF. I was tempted and Chuck about had me convinced but I wanted new cylinders and I wasn't going to have them ground straight and void the warranty and add cost. Chuck Claims more power and cooler temps, but it doesn't seem to be getting popular. I'd love to see some real data from a Dynon. Tim Sent from my iPad On Aug 30, 2012, at 9:48 AM, Bernard Despins wrote: > > Does anybody have any experience with straight bore aircraft cylinders? > > I came upon this website that seems to be all for it: > > http://www.chuckneyent.com/cylinderoverhaul.asp > > Bernard Despins > > > > ________________________________ Message 4 _____________________________________ Time: 02:18:42 PM PST US Subject: Re: Engines-List: Choke-free Cylinders From: Kelly McMullen I have some of Chucks cylinders on my IO-360-A1A. My cylinders do run cool, rarely over 350 even here in Aridzona in the summer. I won't may any claims about power. On the other hand, one does need to look in Lycoming's table of clearances and set ring gaps appropriate to straight bore. Yes, Lycoming actually publishes ring gaps for straight bore cylinders. It may involve getting .005 oversize rings and filing them down to correct clearance. I have about 700 hours on the engine since I rebuilt it. Compressions are still all good. On Thu, Aug 30, 2012 at 11:01 AM, Tim Andres wrote: > > There's a few threads on it over at VAF. I was tempted and Chuck about had me convinced but I wanted new cylinders and I wasn't going to have them ground straight and void the warranty and add cost. > Chuck Claims more power and cooler temps, but it doesn't seem to be getting popular. I'd love to see some real data from a Dynon. > > Tim > > Sent from my iPad > > On Aug 30, 2012, at 9:48 AM, Bernard Despins wrote: > >> >> Does anybody have any experience with straight bore aircraft cylinders? >> >> I came upon this website that seems to be all for it: >> >> http://www.chuckneyent.com/cylinderoverhaul.asp >> >> Bernard Despins >> >> >> >> > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message engines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Engines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/engines-list Browse Digests http://www.matronics.com/digest/engines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.