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noconwud(at)earthlink.net
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 Posted: Wed May 09, 2012 3:34 pm Post subject: Is it possible to convert a conventional tappet IO-540 C4D5 |
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After spending many professional years in building and repairing diesel engines on ships, I've become a believer in roller tappet technology. I'm certain there are other professional opinions out there on the subject, but my specific question for the group is: Can you take an engine that has conventional tappets and install roller tappets without altering the crankcase?
Thanks.
Andy Johnson
[quote][b]
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Jim Berry
Joined: 10 Jan 2006
Posts: 237
Location: Denver
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| Posted: Wed May 09, 2012 4:09 pm Post subject: Re: Is it possible to convert a conventional tappet IO-540 C |
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A few conversions have been done, but it requires modifying the case. Lyc. will not do the conversion.
Jim Berry
N15JB
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woxofswa
Joined: 12 Aug 2008
Posts: 349
Location: AZ
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| Posted: Thu May 10, 2012 6:14 pm Post subject: Re: Is it possible to convert a conventional tappet IO-540 C |
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I've heard that with a prop strike, even a soft one (safety cone, taxiway light, no engine stoppage), Lycoming REQUIRES that all of the roller tappets be replaced and they are huge coin.
The old school ones are much cheaper and only have to be inspected in a strike, or so I was told.
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Myron Nelson
Mesa, AZ
Flew May 10 2014 |
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motoracer(at)gmail.com
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| Posted: Fri May 11, 2012 6:31 am Post subject: Is it possible to convert a conventional tappet IO-540 C4D5 |
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I was quoting an overhaul with LyCon recently and we got to talking about the Roller Tappet conversion. LyCon will machine an upgrade into the case, but it needs to be a very recently made case. In our situation the case was 30 years old, so it didn't apply. If we really wanted to do it, LyCon said that they could try to do a core swap for a newer case, but that it would have a cost. Don't quote me on it, but I recall the conversion adding somewhere in the ballpark of $10K (and I think that is with a newer core), putting the option just about in the middle between a high performance overhaul and a new high performance LyCon built engine.
Tim
Aircrafters
140 Aviation Way
Watsonville CA, 95076
KWVI
[url=tel:831-722-9141]831-722-9141[/url]
www.AircraftersLLC.com
[quote][b]
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Rhonda(at)bpaengines.com
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| Posted: Fri May 11, 2012 6:48 am Post subject: Is it possible to convert a conventional tappet IO-540 C4D5 |
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Those recent cases are difficult to find with the core market like it is, and there is some risk with doing the conversion of damaging the cases, and then they have to be repaired by a case overhaul shop, usually CSI in Sand Springs, OK.
[b]Rhonda Barrett-Bewley[/b]
[i]Barrett Precision Engines[/i]
2870-B N. Sheridan Rd.
Tulsa, OK 74115
(918) 835-1089 phone
(918) 835-1754 fax
www.barrettprecisionengines.com
From: owner-rv10-list-server(at)matronics.com [mailto:owner-rv10-list-server(at)matronics.com] On Behalf Of Timothy Farrell
Sent: Friday, May 11, 2012 9:31 AM
To: rv10-list(at)matronics.com
Subject: Re: Is it possible to convert a conventional tappet IO-540 C4D5
I was quoting an overhaul with LyCon recently and we got to talking about the Roller Tappet conversion. LyCon will machine an upgrade into the case, but it needs to be a very recently made case. In our situation the case was 30 years old, so it didn't apply. If we really wanted to do it, LyCon said that they could try to do a core swap for a newer case, but that it would have a cost. Don't quote me on it, but I recall the conversion adding somewhere in the ballpark of $10K (and I think that is with a newer core), putting the option just about in the middle between a high performance overhaul and a new high performance LyCon built engine.
Tim
Aircrafters
140 Aviation Way
Watsonville CA, 95076
KWVI
[url=tel:831-722-9141]831-722-9141[/url]
www.AircraftersLLC.com | Quote: | | http://www.matronics.com/Navigator?RV10-List |
0123456789
[quote][b]
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Kelly McMullen
Joined: 16 Apr 2008
Posts: 1188
Location: Sun Lakes AZ
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| Posted: Fri May 11, 2012 6:49 am Post subject: Is it possible to convert a conventional tappet IO-540 C4D5 |
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Just got a quote from Lycon yesterday. Roller cam and lifters with the modified case is a $3000 option. While I'm sure there is some benefit, I'm not convinced it is that big a benefit. I tend to think flow balancing the cylinders is a bigger benefit for less money.
On Fri, May 11, 2012 at 7:30 AM, Timothy Farrell <motoracer(at)gmail.com (motoracer(at)gmail.com)> wrote:
[quote] I was quoting an overhaul with LyCon recently and we got to talking about the Roller Tappet conversion. LyCon will machine an upgrade into the case, but it needs to be a very recently made case. In our situation the case was 30 years old, so it didn't apply. If we really wanted to do it, LyCon said that they could try to do a core swap for a newer case, but that it would have a cost. Don't quote me on it, but I recall the conversion adding somewhere in the ballpark of $10K (and I think that is with a newer core), putting the option just about in the middle between a high performance overhaul and a new high performance LyCon built engine.
Tim
Aircrafters
140 Aviation Way
Watsonville CA, 95076
KWVI
[url=tel:831-722-9141]831-722-9141[/url]
www.AircraftersLLC.com
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Kelly McMullen
A&P/IA, EAA Tech Counselor
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