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Search: Posts Made By: theduff
Forum: Autopilots 01-22-2021, 12:51 PM
Replies: 11
Views: 1,223
Posted By theduff
xCruze 110 Auto-Pilots

Hey Andrew,
I see you fly a 4 as well..wonderful plane and not sure if it should have an auto-pilot but on those Oshkosh trips from the west coast it would be nice. I called Bendix-King this week and...
Forum: Traditional Aircraft Engines 01-06-2021, 09:12 AM
Replies: 11
Views: 1,327
Posted By theduff
Roller Tappets

To answer your question yes. The case can be machined for roller tappets by LyCon who have a C & C program for doing it. Iíve had several cases converted. To avoid welding around the tappet bosses on...
Forum: Traditional Aircraft Engines 01-05-2021, 03:46 PM
Replies: 11
Views: 1,327
Posted By theduff
DC coated lifters

Ditto on what Larry said. Jessie is fair at Colorado Airparts.
Forum: Propellers 12-31-2020, 01:26 PM
Replies: 10
Views: 1,515
Posted By theduff
Wood Props

I have and flown behind a metal FP as well as a variety of wood props. Warnkeís both Bernie and Margy, Pacesetter, Sterba and Performance Propellers both Clark and Frankís versions. I can say that...
Forum: Traditional Aircraft Engines 12-30-2020, 12:55 PM
Replies: 4
Views: 893
Posted By theduff
Oil transfer tube

Oh boy, not good. I can tell you a few things but maybe others will chime in with better news. The oil transfer tube is not made/sold as a separate part. A new one can be machined but it must be...
Forum: Traditional Aircraft Engines 12-27-2020, 03:41 PM
Replies: 17
Views: 3,905
Posted By theduff
Orfice Size

Gil knows the manufacturer’s recommendations over rule the the AC cause he said so in a similar thread in 2017 ! Lycoming Service Instruction specifically calls out the .040” orifice for all their...
Forum: Traditional Aircraft Engines 12-15-2020, 12:06 PM
Replies: 9
Views: 1,438
Posted By theduff
Looks like the corners of the teeth have been...

Looks like the corners of the teeth have been ground on. I would try the shim on the starter. I have one if you have trouble rustling one up.
Forum: RV General Discussion/News 12-15-2020, 12:00 PM
Replies: 31
Views: 2,792
Posted By theduff
Tosten

Actually a tip up 6 😎!
+1 on Kevin !!
Forum: RV-6/6A 12-14-2020, 09:43 AM
Replies: 6
Views: 1,189
Posted By theduff
Fuel Tank sending units

I upgraded the tanks in my 4 several years ago that had the original SW units and the mounting holes matched up. The new ones come with a sketch and dimensions for bending and mounting the float on...
Forum: RV General Discussion/News 12-09-2020, 10:23 AM
Replies: 7
Views: 1,790
Posted By theduff
Non ferrous metal

It’s not unusual to find small amounts of non ferrous metal,ie a match head, In the early running of engines that have been overhauled.The trend is your friend here though. Are you still finding it...
Forum: RV General Discussion/News 12-08-2020, 01:57 PM
Replies: 10
Views: 735
Posted By theduff
122 to 149 tooth ring gear

Unfortunately no. The widths are different. You should be able to find a 149 tooth flywheel ( support assembly) used here on VAF or Ebay for around $300.
Sorry reread your post and see your getting...
Forum: Traditional Aircraft Engines 11-29-2020, 10:44 AM
Replies: 18
Views: 3,233
Posted By theduff
[QUOTE=Toobuilder;1232466]Pretty much exactly...

[QUOTE=Toobuilder;1232466]Pretty much exactly what I did. Flat plates with ears, and I even machined a dish into them to save a few grams. Studs removed and bolts installed. No issues so...
Forum: RV Friends Who Have Passed On 11-27-2020, 12:31 PM
Replies: 7
Views: 3,744
Posted By theduff
RV-4 N87LW down in Telluride

Good friend of mine killed on Thanksgiving Day.Such a tragedy. Lots of speculation but no clear cause at this point. Driving myself crazy trying to figure it out.
We both flew our 4ís into Telluride...
Forum: Traditional Aircraft Engines 11-25-2020, 02:23 PM
Replies: 2
Views: 403
Posted By theduff
I can supply you with a good set of the early...

I can supply you with a good set of the early tubes but I’d rather supply you with the latter sump which provides much better flow distribution. Give me a call and I’ll give you mor info.
760-805-6641
Forum: Traditional Aircraft Engines 11-24-2020, 02:18 PM
Replies: 38
Views: 3,482
Posted By theduff
Certificates Engines in EAB

Dewy,
Are the calendar time TBOís mandatory for certified engines flying under part 91 ? I would guess they are not.
Forum: Traditional Aircraft Engines 11-24-2020, 10:24 AM
Replies: 38
Views: 3,482
Posted By theduff
Aluminum & Steel Oil pump impellers

I’m curious as to what Lycoming told you in regards to changing your aluminum oil pump impellers ?

“What I found was that the oil impeller gears, as indicated by serial number and date of...
Forum: Traditional Aircraft Engines 11-16-2020, 08:04 AM
Replies: 7
Views: 1,273
Posted By theduff
Leaky Pushrod seal

Iím at L-18 and may be able to lend a hand. PM me if you need some help.
Forum: RV General Discussion/News 11-15-2020, 09:09 PM
Replies: 16
Views: 2,928
Posted By theduff
Final Flight ?

Stu did u sell your 8 ? In the background of your Hangar I spied a 4 project that looked like it was pretty far along ?
When I see your overwater legs it makes me nervous... Im sure I torqued those...
Forum: RV-4 11-15-2020, 11:27 AM
Replies: 11
Views: 2,313
Posted By theduff
RV-4 Acro w/Backseater

I’ve been building and flying RV-4’s since the days when Van would fly his 4 to fly-ins and pass out brochures while standing in front of his 4. Van is an engineer and his numbers have real meaning...
Forum: Traditional Aircraft Engines 11-02-2020, 09:16 AM
Replies: 3
Views: 740
Posted By theduff
0320-E2D

The E2D is a 7:1 compression motor putting out 150 hp. They used the thin wall piston pins. The 8.5:1 compression motors putting out 160 hp used the thick wall piston pins. I suspect you will be...
Forum: Traditional Aircraft Engines 10-13-2020, 02:54 PM
Replies: 8
Views: 1,194
Posted By theduff
150 H.P.

If your serious about the conversion I have a better idea. I have a 150 HP Conical Mount narrow deck crankcase that you could transfer your crank rods etc into. The previous posters mentioned the...
Forum: Traditional Aircraft Engines 10-07-2020, 10:48 PM
Replies: 4
Views: 1,037
Posted By theduff
LyCon Case O-Ring

I use LyCon oringing on the majority of the engines I build and on all my personal engines. Never had a seep. LyCon now has an STC so they can o-ring certified engines cases as well. Well worth the...
Forum: RV-14 09-14-2020, 01:09 PM
Replies: 96
Views: 22,864
Posted By theduff
The Definitive Answer !!

Below my correspondence with Lycoming:

Hello,
In section 9 of Lycomingís Overhaul Manual for Direct Drive Engines, there is a Table 9-1 titled Engine Run-In Test Limits. In that table you give 2...
Forum: RV-14 09-11-2020, 04:44 PM
Replies: 96
Views: 22,864
Posted By theduff
Oil Temp Probes

Snap goes the trap !!

Obscure as in printed in 1945 and revised in 55. The test cell operator that I work with hadn’t ever heard of the dry sump rig and the one tech I talked to at Lycoming hadn’t...
Forum: RV-14 09-11-2020, 11:53 AM
Replies: 96
Views: 22,864
Posted By theduff
Inlet vs Outlet Temp

Larry your concerns mirror mine. The last thing I want to do is mislead anybody. In that regard I have talked to 2 of the sharpest Lycoming guys I know and they arenít sure how Lycoming defines inlet...
Forum: RV-14 09-10-2020, 04:08 PM
Replies: 96
Views: 22,864
Posted By theduff
Inlet Temperature?

RV8JD posts an excerpt from an IO-360’s operating manual which gives the max oil temperature as 245* but that brings me back to my original point:
Isn’t Inlet Temperature pre-oil cooler ? If That is...
Forum: RV-14 09-10-2020, 03:54 PM
Replies: 96
Views: 22,864
Posted By theduff
Table 9-1 Engine Run-In Test Limits

I donít subscribe to a photo hosting site so canít use the embedded image hosting feature.
Iím getting my info from the Lycoming Overhaul Manual Section 9.

I can email a screenshot of the page to...
Forum: RV-14 09-10-2020, 12:23 PM
Replies: 96
Views: 22,864
Posted By theduff
Red line oil temp

Again referring to the Lycoming manual they spec 230* as max pre-cooler temp with post cooler being 210*. That would seem to indicate the 20* youíve speculated is about right. I would just get back...
Forum: RV-14 09-10-2020, 12:07 PM
Replies: 96
Views: 22,864
Posted By theduff
Lycoming min oil temp spec.

ďnow on the other end I hear pilots bragging about their oil temps are only 175*-180*. Thatís too cold. I believe you need 190* min to burn off the moistureĒ
DanH ďSorry no basis for your beliefĒ

I...
Forum: Traditional Aircraft Engines 09-10-2020, 01:23 AM
Replies: 4
Views: 1,269
Posted By theduff
Vacuum Valve

I switched to the anti-splat set up about 100 hours ago and have been very happy with it. I didnít use their saddle mount fitting as I had a threaded bung welded into the colector of my 4 into 1...
Forum: Texas (South) 09-09-2020, 10:16 PM
Replies: 6
Views: 1,370
Posted By theduff
Permian Basin Petroleum Museum

Donít miss the Petroleum Museum in Midland as it has a Chaparral Wing where Jim Hall has all his restored race cars housed including the first moveable wing on a race car, the Chaparral 2E. Legend...
Forum: RV-14 09-09-2020, 10:00 PM
Replies: 96
Views: 22,864
Posted By theduff
Angle Valve Engine Oil Temps

Just a thought as Iíve battled oil temps as well. Most of you know by now that the angle valve engines employ piston cooling nozzles that spray a mist of oil on the bottom side of the piston to cool...
Forum: Safety 09-09-2020, 09:24 PM
Replies: 39
Views: 11,601
Posted By theduff
Connecting Rod Nuts

+2 on connecting rods as well. On the higher horsepower Lycoming Engines that utilize tongue and grove rods ( ie angle valve motors ) you torque the rod bolt by stretching it to a very specific...
Forum: Safety 09-09-2020, 10:39 AM
Replies: 39
Views: 11,601
Posted By theduff
AN363

I read this post a while back and had the question in my mind but too lazy to respond I guess. How do you use AN363 nuts which are fine thread on a Lycoming stud which is coarse thread ? Almost all...
Forum: Traditional Aircraft Engines 08-27-2020, 01:20 PM
Replies: 36
Views: 5,737
Posted By theduff
340 cylinders

Thanks J B for piping in. I made a bad assumption about the 340 cylinder dimensions. After talking to a very knowledgeable source I learned that when using the 340 stroker crank they make up the...
Forum: Traditional Aircraft Engines 08-26-2020, 12:39 PM
Replies: 36
Views: 5,737
Posted By theduff
Valve Rotation

Thanks Tim for a great article explaining how the rotator caps work on a Lycoming:
ďNote that the thimble valve rotator design *permits* rotation (when the valve is open) but does not *impart*...
Forum: Traditional Aircraft Engines 08-24-2020, 03:31 PM
Replies: 36
Views: 5,737
Posted By theduff
Intake Valve Rotation

Iím a Lycoming guy and I question some of this. On Parallel Valve cylinders the exhaust valve has a rotator cap which actually releases the valve keepers as the rocker depresses the valve allowing...
Forum: RV-4 08-12-2020, 12:10 PM
Replies: 12
Views: 5,240
Posted By theduff
Forward Storage Area

Super simple solution. On my RV-4 I bought a motorcycle tank travel bag, cut of the nylon straps and set it on my battery cover between my legs. The non slip rubber bottom keeps it from moving in...
Forum: COMM 06-22-2020, 11:40 AM
Replies: 3
Views: 882
Posted By theduff
XCom Avionics

Wondering if anybody has any info on the status of this Australian Company. Their website seems to be dead and can?t find anybody carrying the radio anymore.
I?ve emailed RocketBob but haven?t heard...
Forum: RV-14 05-24-2020, 11:53 AM
Replies: 9
Views: 1,506
Posted By theduff
Stud interference fit

If you use a Lycoming/superior part # they have a interference built in to the thread cut, no need for oversized studs. If as you mention you want course thread/fine thread studs I would suggest...
Forum: Traditional Aircraft Engines 05-13-2020, 10:41 AM
Replies: 2
Views: 797
Posted By theduff
IO-360 sumps

Please give me a call I may have the correct sump your after. I am curious as to the rear draft sump you refer to. Is the sump made out of magnesium ? If so that sump comes off the IO-360-C1C.
Duff...
Forum: Traditional Aircraft Engines 03-26-2020, 10:20 AM
Replies: 3
Views: 728
Posted By theduff
Body-Fit Through Bolts

?Interference fit ? They need to go in solid if you can push them through by hand they?re too loose. I often have too use P-1 ( .001? oversized) through bolts in some locations with the center main (...
Forum: Traditional Aircraft Engines 03-19-2020, 12:51 PM
Replies: 13
Views: 1,877
Posted By theduff
Crankshaft Dilemma

I?ve built a few engines and this choice has always been an interesting dilemma. Usually price wins out, but in the current market availability may be the primary driver. Try to find any good used...
Forum: Traditional Aircraft Engines 03-17-2020, 12:23 PM
Replies: 163
Views: 35,595
Posted By theduff
Superior Crankshaft Failures

I found it interesting in the second metallurgical report they found:
?The tensile properties of the Crankshaft material were outside the range of the specified limits?
They went on to say this...
Forum: Traditional Aircraft Engines 02-10-2020, 09:59 AM
Replies: 16
Views: 2,598
Posted By theduff
Failed Cerminil cylinders

“I would go so far as stating that if anybody is flying early to mid 2000's ECI Titan nickle cylinders they need to swap them out for something else before they cause serious bottom end damage after...
Forum: Traditional Aircraft Engines 01-30-2020, 11:53 AM
Replies: 28
Views: 4,401
Posted By theduff
Oil Slinger NOT a thrust face

Snowflake
?That *is* a thrust bearing. It's not a separate, replaceable part, but it is a thrust bearing.?
The feature of the crankshaft mentioned is NOT a thrust face in a tractor configuration. As...
Forum: RV Ongoing Maintenance Issues 01-30-2020, 11:32 AM
Replies: 65
Views: 9,914
Posted By theduff
O-ring Flanges

DanH
?The outboard o-ring flange was removed so the tube could enter the sump a bit further? ?
Negative. The inboard ends the tubes are as manufactured. We went so far as to fabricate some aluminum...
Forum: RV Ongoing Maintenance Issues 01-29-2020, 10:02 PM
Replies: 65
Views: 9,914
Posted By theduff
My Horizontal Induction Set Up

I run a 10:1 compression IO-360 parallel valve with a magnesium Sump from an IO-360-C1C. I machined the front pad to match an AFP FM 200 servo and it is equipped with a purge valve. The intake tubes...
Forum: Traditional Aircraft Engines 01-29-2020, 12:36 PM
Replies: 28
Views: 4,401
Posted By theduff
Oil Slinger

Larry
“Just to clarify for the curious, the Lycoming does not have a thrust bearing/bushing. The crankshaft has about a 3/16" ring (it is integral to the crank, just machined) on it just forward of...
Forum: RV Ongoing Maintenance Issues 01-29-2020, 12:12 PM
Replies: 65
Views: 9,914
Posted By theduff
Sump (explosion)

Originally Posted by DanH View Post

So, want to worry about blowing your sump to bits? The risk is found when cranking at low temperatures, with very, very little liquid fuel on the plenum...
Forum: RV Ongoing Maintenance Issues 01-27-2020, 02:14 PM
Replies: 65
Views: 9,914
Posted By theduff
Sniffle Valve

[QUOTE=DanH;1403378]Scott, consider the waste spark, arriving at the top of the exhaust stroke, or a little before. Both valves are open, thus it's not possible to generate significant cylinder...
Forum: RV Ongoing Maintenance Issues 01-20-2020, 11:59 AM
Replies: 32
Views: 4,424
Posted By theduff
I’ve had similar problems recently on 2 different...

I’ve had similar problems recently on 2 different O-320’s I’ve built, just don’t have enough leaning authority. If you have a fuel flow it might be helpful to post those numbers. In my case both...
Forum: RV General Discussion/News 01-14-2020, 11:42 PM
Replies: 10
Views: 1,207
Posted By theduff
I honestly don?t know if the new design nose gear...

I honestly don?t know if the new design nose gear provides more room in that area. I?m thinking RVBuilder 2002 might know the answer to that one.
Forum: RV General Discussion/News 01-14-2020, 11:36 PM
Replies: 10
Views: 1,207
Posted By theduff
Front governor to rear governor conversion

?As already mentioned, you have to make an adapter plate that mounts in place of the gov., and has a port built into it to connect a hose routed from the output of the rear gov drive.[/QUOTE]?

Okay...
Forum: RV General Discussion/News 01-14-2020, 11:44 AM
Replies: 10
Views: 1,207
Posted By theduff
IO-360-C1E6 figment issues

Negative on converting front governor case to acc.case mounted governor on the rear. There is no port from the front main to feed the rear governor adapter. Also when using the C1C/C1E6 magnesium...
Forum: GPS 12-25-2019, 11:36 AM
Replies: 646
Views: 330,904
Posted By theduff
Aera 660 External Antenna MCX Jack

Hey Steve,
I use my 660 in a panel dock in my RV-4 and since I added an external antenna it has been a great performer with 3 years of flawless service. Recently my AERA 660 started having problems...
Forum: Traditional Aircraft Engines 11-29-2019, 01:50 PM
Replies: 10
Views: 1,500
Posted By theduff
Dual Mag engines

You are correct.
I didn?t include them because they don?t use oil filter adapters. In there unique case they are integral with the accessory drive housing. Makes you wonder why Lycoming didn?t make...
Forum: Traditional Aircraft Engines 11-29-2019, 10:42 AM
Replies: 10
Views: 1,500
Posted By theduff
Oil filter swaps

One cautionary note : Oil filter adapters with the male thread require filters with an internal bypass valve while oil filter adapters with a female thread have the bypass valve built into the...
Forum: Traditional Aircraft Engines 11-27-2019, 05:58 AM
Replies: 31
Views: 18,200
Posted By theduff
Cerminil Cylinders

The obvious way is the painted patch on top (between pushrods) of the Cylinders. ECI Cylinders have a blue and silver stripe to designate cerminil plated process. You?ll observe Lycoming cylinders...
Forum: Safety 10-31-2019, 11:35 PM
Replies: 14
Views: 4,427
Posted By theduff
Lint

I suspect it came from either shop disposable towels or rags. Might have cleaned something in the fuel system and wiped it off with the above.
Sorry for your loss.
Duff
Forum: Traditional Aircraft Engines 10-06-2019, 11:08 AM
Replies: 32
Views: 6,170
Posted By theduff
320 Hemi Dyno Sheets

I found the old dyno sheets and the results were better than I remembered.
It averaged 196 hp at 2700 rpm on several blasts.
It also pulled over 200 hp on a couple of 2800 rpm blasts.
Forum: Traditional Aircraft Engines 10-06-2019, 10:54 AM
Replies: 32
Views: 6,170
Posted By theduff
320 ?Hemi?

I built a wide deck 320 with angle valve heads for a buddies RV-4 and had good luck with it. It?s still flying and doing great the last I heard. Basically I was just trying to replicate what the old...
Forum: Traditional Aircraft Engines 09-23-2019, 12:25 PM
Replies: 14
Views: 4,464
Posted By theduff
Exhaust Leak

I?ve seen this strange orange color many times before. You have an exhaust leak at a minimum but looking around the sparkplug I suspect you may have a cracked head as well.😕
Forum: Traditional Aircraft Engines 08-23-2019, 06:20 PM
Replies: 7
Views: 1,088
Posted By theduff
Hey Joop, It’s not the sump although it could...

Hey Joop,
It’s not the sump although it could have a minimal effect it’s the piston cooling nozzles that are utilized in all 200 hp Lycoming’s that use the horizontal induction or as some call them...
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