---------------------------------------------------------- Engines-List Digest Archive --- Total Messages Posted Sat 06/24/06: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:51 AM - Re: Lycoming Thunderbolt Engines (Archie) 2. 05:24 PM - Re: Lycoming Thunderbolt Engines (n801bh@netzero.com) ________________________________ Message 1 _____________________________________ Time: 06:51:53 AM PST US From: "Archie" Subject: Re: Engines-List: Lycoming Thunderbolt Engines Two companies tried that in aviation, and failed. There are a series of parameters that do not directly apply to aircraft use, but for the most part, why re invent the wheel, when the racing industry has been using a variety of these for about 50 years. They are available in extruded aluminum, forged aluminum, and stainless, fully rollerized, or bushed and roller tipped, and in any ratio desired. (After correcting the ratio on a number of aircraft rockers, it is obvious that the factory does not pay close attention to this) As far as strength, no contest here: Where an aircraft may have open pressure of approx. 300lbs, we run open pressures of around 1000 lbs. Another significant advantage to the roller rockers is reduced valve guide wear. Not sure of HP gains on a slow turning ac engine, but might be interesting to dyno each. Archie ----- Original Message ----- From: n801bh@netzero.com To: engines-list@matronics.com Sent: Saturday, June 24, 2006 2:12 AM Subject: Re: Engines-List: Lycoming Thunderbolt Engines Geez,,, Roller rockers are pretty easy to fabricate, test and furnish.. Cheap HP gains from them too.. You would figure a company like Lycoming, with 60+ years of supposable R&D would have addressed that simple thing years ago. Now,,, if they can get their crankshafts from breaking they might go somewhere. You can bet if one does break on this new line of experimental engines the their response will be "_uckoff" ,,,,Their is something wrong with in installation.. They will not stand behind their certified engines.!!!!!!!!!!!!!!!! ________________________________ Message 2 _____________________________________ Time: 05:24:13 PM PST US From: "n801bh@netzero.com" Subject: Re: Engines-List: Lycoming Thunderbolt Engines Friction is Friction...... but you already knew that Archie... Less fric tion= more power. I have been into more "certified aircraft" then I ca re to admit. In every instance I shake my head in amazement at how they get away with such crude technology and machining tolerances. You can be t most of the valve guide failures and premature wear are because of POO R quality control during the machining process. That is exactly why I pr oduce an auto engine conversion for experimental planes using the latest and best parts available. I kinda chuckle at the ad where Thielert anno unces the "new" technology of roller lifters. Gm's 53 and 71 series Detr iot Diesels have had that stuff since the late 1940's. There is a fool b orn every minute and most will end up buying a Lycoming or Cont thinking it they are on the cutting edge of technology. Thank god for the experi mental movement !!!!!!!!!!!!!!!!!!!!!!! do not achive Ben Haas N801BH www.haaspowerair.com -- "Archie" wrote: Two companies tried that in aviation, and failed.There are a series of p arameters that do not directly apply to aircraft use,but for the most pa rt, why re invent the wheel, when the racing industry has been using a v ariety of these for about 50 years.They are available in extruded alumin um, forged aluminum, and stainless,fully rollerized, or bushed and rolle r tipped, and in any ratio desired.(After correcting the ratio on a numb er of aircraft rockers, it is obvious thatthe factory does not pay close attention to this) As far as strength, no contest here: Where an aircra ft may have open pressureof approx. 300lbs, we run open pressures of aro und 1000 lbs.Another significant advantage to the roller rockers is redu ced valve guide wear.Not sure of HP gains on a slow turning ac engine, b ut might be interesting to dyno each.Archie----- Original Message ----- June 24, 2006 2:12 AMSubject: Re: Engines-List: Lycoming Thunderbolt Eng ines Geez,,, Roller rockers are pretty easy to fabricate, test and furnish.. Cheap HP gains from them too.. You would figure a company like Lycoming, with 60+ years of supposable R&D would have addressed that simple thing years ago. Now,,, if they can get their crankshafts from breaking they might go somewhere. You can bet if one does break on this new line of ex perimental engines the their response will be "_uckoff" ,,,,Their is som ething wrong with in installation.. They will not stand behind their cer tified engines.!!!!!!!!!!!!!!!!

Friction is Friction...... but you already knew that Archie... Less friction= more power. I have been into more "certified aircraft" then I care to admit. In every instance I shake my head in amazement at how they get away with such crude technology and machining tolerances. Y ou can bet most of the valve guide failures and premature wear are becau se of POOR quality control during the machining process. That is exactly why I produce an auto engine conversion for experimental planes us ing the latest and best parts available. I kinda chuckle at the ad where  Thielert announces the "new" technology of roller lifters. Gm's 53 and 71 series Detriot Diesels have had that stuff since the late 1 940's. There is a fool born every minute and most will end up buying a L ycoming or Cont thinking it they are on the cutting edge of technol ogy. Thank god for the experimental movement !!!!!!!!!!!!!!!!!!!!!!!

do not achive 


Ben Haas
N801BH
www.haaspow erair.com

-- "Archie" <archie97@earthlink.net>&nb sp;wrote:

Two companies tried that in avi ation, and failed.
There are a series of parameter s that do not directly apply to aircraft use,
but for the most part, why re i nvent the wheel, when the racing industry
has been using a variety of the se for about 50 years.
They are available in extruded aluminum, forged aluminum, and stainless,
fully rollerized, or bushed and roller tipped, and in any ratio desired.
(After correcting the ratio on a number of aircraft rockers, it is obvious that
the factory does not pay close attention to this) 
As far as strength, no contest here: Where an aircraft may have open pressure
of approx. 300lbs, we run open pressures of around 1000 lbs.
Another significant advantage t o the roller rockers is reduced valve guide wear.
Not sure of HP gains on a slow turning ac engine, but might be interesting to dyno each.
Archie
----- Original Message -----
From: n801bh@netzero.com
To: engines-list@matroni cs.com
Sent: Saturday, June 24, 2006 2:1 2 AM
Subject: Re: Engines-List: Lycomi ng Thunderbolt Engines

Geez,,, Roller rockers are pretty easy to fabricate, test and furnish.. Cheap HP gains from them too.. You would figure a company like Lycoming, with 60+ years of supposable R&D would have addresse d that simple thing years ago. Now,,, if they can get their crankshafts from breaking they might go somewhere. You can bet if one does break on this new line of experimental engines the their response will be "_uckof f" ,,,,Their is something wrong with in installation.. They will not sta nd behind their certified engines.!!!!!!!!!!!!!!!!




&n bsp;