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Search: Posts Made By: DanH
Forum: Fuel Injection Systems 03-05-2021, 06:35 PM
Replies: 90
Views: 5,913
Posted By DanH
I doubt it is timed to intake valve...

I doubt it is timed to intake valve operation...at least not all the intake valves. More likely half of them.



Probably true, but how to know why? There's no operating manual available for...
Forum: Fuel Injection Systems 03-05-2021, 07:34 AM
Replies: 90
Views: 5,913
Posted By DanH
...which is a significant plus for either...

...which is a significant plus for either currently available PWM FI system, as compared to constant flow FI.

Which brings us back to the OP's question.

I've attached a semi-sequential injection...
Forum: RV-4 03-04-2021, 08:16 PM
Replies: 4
Views: 307
Posted By DanH
Considering the inlet as a throttle in a system...

Considering the inlet as a throttle in a system intended to raise static pressure makes no sense...but obviously folks still do it.
Forum: Fuel Injection Systems 03-04-2021, 08:13 AM
Replies: 90
Views: 5,913
Posted By DanH
I assume Matt is referring to vapor pressure, not...

I assume Matt is referring to vapor pressure, not price or quality. Any EFI has a clear advantage over constant flow when the fuel has a high vapor pressure (i.e. mogas), as the fuel is held at...
Forum: Fiberglass 03-04-2021, 08:07 AM
Replies: 20
Views: 1,494
Posted By DanH
Larry, here's a graphical presentation borrowed...

Larry, here's a graphical presentation borrowed from a textbook:

https://www.danhorton.net/VAF/Oil%20Cooler%20Shroud/Diffuser%20Flows.pdf

I've attached a sketch below. I'm pushing my pay grade...
Forum: Fuel Injection Systems 03-03-2021, 10:35 PM
Replies: 90
Views: 5,913
Posted By DanH
- Come on now, don't be Bashful... -

-
Come on now, don't be Bashful...
-
Forum: RV General Discussion/News 03-03-2021, 10:22 PM
Replies: 71
Views: 12,797
Posted By DanH
Previously I wrote: Short version...motor...

Previously I wrote:



Short version...motor response to left-right input was far too abrupt, but reprogramming fixed it.

The Sabertooth controller is a fancy piece intended for robots. Tech...
Forum: Alternative Engines 03-02-2021, 05:59 PM
Replies: 17
Views: 2,903
Posted By DanH
I'm a gearhead, so I like all of them. ...

I'm a gearhead, so I like all of them. Seriously.

That said, some applications just don't make sense.
Forum: Traditional Aircraft Engines 03-02-2021, 03:40 PM
Replies: 19
Views: 1,406
Posted By DanH
Brian, that combination of fittings can be...

Brian, that combination of fittings can be applied poorly, or well. If you're not sure, come back with photos after installation, and lots of your peers will take a look, ok?
Forum: Fuel Injection Systems 03-02-2021, 10:15 AM
Replies: 90
Views: 5,913
Posted By DanH
Excellent. That means the open point in the...

Excellent. That means the open point in the diagrams is pretty darn close, certainly close enough for this illustration.

Ok, I've attached a similar diagram for mechanical constant flow, i.e. the...
Forum: Traditional Aircraft Engines 03-02-2021, 08:17 AM
Replies: 19
Views: 1,406
Posted By DanH
The two lines cannot disconnect the pump fitting...

The two lines cannot disconnect the pump fitting from the pump. The fitting cannot rotate in the pump more than a few degrees at worst.

I wish the same could be said for the B nut on the servo...
Forum: Fuel Injection Systems 03-01-2021, 09:46 PM
Replies: 90
Views: 5,913
Posted By DanH
Ok, the given values say the all the injectors...

Ok, the given values say the all the injectors open together for 50% of a 720 degree crank rotation at 2252 RPM. At 2672 RPM, the injectors are open 72% of a 720 degree crank rotation.

As noted,...
Forum: Traditional Aircraft Engines 03-01-2021, 07:31 PM
Replies: 19
Views: 1,406
Posted By DanH
The main line, to the servo, should not be...

The main line, to the servo, should not be allowed to flop about in space. It should be firmly tied to the engine, so hose, engine, and pump are all moving together. No moment to loosen...
Forum: Traditional Aircraft Engines 03-01-2021, 03:10 PM
Replies: 19
Views: 1,406
Posted By DanH
Fuel Pressure Fitting

I recently viewed some photos taken after a fuel starvation incident, and thought it might be good to pass along a tip for the new guys.

The builders' goal was to access the engine driven fuel...
Forum: RV General Discussion/News 03-01-2021, 02:42 PM
Replies: 8
Views: 1,168
Posted By DanH
Do ya'll draw straws to see who gets that job? I...

Do ya'll draw straws to see who gets that job? I have visions of a giant flyswatter. ;)

About 15 years ago I watched some poor soul flip one at Reklaw, landing long and standing on the brakes over...
Forum: Traditional Aircraft Engines 03-01-2021, 09:11 AM
Replies: 10
Views: 804
Posted By DanH
BTW, what engine/prop/fuel system/ignition are we...

BTW, what engine/prop/fuel system/ignition are we talking about here?
Forum: Fuel Injection Systems 02-28-2021, 07:15 PM
Replies: 90
Views: 5,913
Posted By DanH
So Ross, when and how long does an SDS system...

So Ross, when and how long does an SDS system open its injectors? Pick whatever RPM and A/F you like. Let's see the result...here's the base diagram.
-
Forum: Fiberglass 02-27-2021, 01:40 PM
Replies: 12
Views: 451
Posted By DanH
Old Faithful. Rescued from a trash can 40 years...

Old Faithful. Rescued from a trash can 40 years ago.
-
Forum: Glass Cockpit 02-27-2021, 08:47 AM
Replies: 11
Views: 771
Posted By DanH
No problem, can do. You'll want to drive the EIS...

No problem, can do.

You'll want to drive the EIS also, so you need a way to tie the backup battery power to it and the second EFIS power input. Two diodes get 'er done. I like a junction block,...
Forum: Fiberglass 02-26-2021, 05:29 PM
Replies: 7
Views: 564
Posted By DanH
Good time to put on galoshes ;) Might be able...

Good time to put on galoshes ;)

Might be able to mold a set using the top of the existing wheel pant. The originals were 9oz plain weave saturated with a room temperature cure urethane rubber. ...
Forum: Fuel Injection Systems 02-26-2021, 01:37 PM
Replies: 90
Views: 5,913
Posted By DanH
Which remains as the simple question on the table.

Which remains as the simple question on the table.
Forum: RV Photo/Video URLs 02-26-2021, 12:14 PM
Replies: 15
Views: 1,478
Posted By DanH
194 KTAS on 9.9 is a good pair of numbers. ...

194 KTAS on 9.9 is a good pair of numbers. You're about 100 ROP there?

Tell us the new inlet ring diameters.
Forum: Fuel Injection Systems 02-26-2021, 08:57 AM
Replies: 90
Views: 5,913
Posted By DanH
Still, I'm pretty sure readers would like to hear...

Still, I'm pretty sure readers would like to hear Robert's explanation of semi-sequential injection...the when, where, and how long it actually injects fuel.

I've attached a quick sketch to make...
Forum: Fuel Injection Systems 02-25-2021, 07:37 AM
Replies: 90
Views: 5,913
Posted By DanH
3D ignition mapping is a standard function of the...

3D ignition mapping is a standard function of the AutoSport Labs ignition controllers I use with EDIS modules. The controllers are currently $199. I've never found a use for it, but it's there. ...
Forum: RV Building Tips/Techniques 02-25-2021, 07:13 AM
Replies: 13
Views: 2,466
Posted By DanH
Not if your airplane happens to be...

Not if your airplane happens to be orange.

Seriously, the red and orange sealants work fine, but they seldom look good. Instead pick up some Permatex Ultra Black, or Loctite 598, which is the same...
Forum: Fuel Injection Systems 02-24-2021, 09:24 AM
Replies: 90
Views: 5,913
Posted By DanH
Roughly 50% of the current new car fleet has gone...

Roughly 50% of the current new car fleet has gone to direct injection, not the port injection discussed here. All operate in closed loop after warmup, most using multiple O2 sensor feedback. All...
Forum: Fuel Injection Systems 02-22-2021, 06:37 PM
Replies: 90
Views: 5,913
Posted By DanH
Robert, when can we expect a user operating...

Robert, when can we expect a user operating manual?

https://www.flyefii.com/downloads/



System 32 is a speed-density system, the operating principle delivered in a 67 VW Type 3 as a Bosch...
Forum: Reviews 02-22-2021, 12:22 PM
Replies: 16
Views: 1,827
Posted By DanH
Correct, but nothing will pool in the manifold in...

Correct, but nothing will pool in the manifold in flight, and the engine won't care about water fed into it as drops and vapor.



That is indeed the purpose of the drain hole...but it doesn't take...
Forum: Reviews 02-22-2021, 08:13 AM
Replies: 16
Views: 1,827
Posted By DanH
I hear ya'. Do note most installations run a...

I hear ya'. Do note most installations run a tube from the sniffle valve on the bottom of the intake system to an attach point at the base of the firewall.

An engine-driven fuel pump has a...
Forum: RV General Discussion/News 02-21-2021, 08:20 PM
Replies: 48
Views: 3,116
Posted By DanH
The poll has been steady at about 15% not...

The poll has been steady at about 15% not attending this year. It's probably a valid indication of what to expect.

Ok, so only nine kegs ;)
Forum: Reviews 02-21-2021, 09:50 AM
Replies: 16
Views: 1,827
Posted By DanH
The sniffle valve is attached to the intake...

The sniffle valve is attached to the intake plenum, not the mechanical fuel pump. It serves two purposes, draining away fuel and oil which may run down from the intake ports, and draining water...
Forum: RV General Discussion/News 02-20-2021, 01:50 PM
Replies: 48
Views: 3,116
Posted By DanH
Monday, after the airshow.

Monday, after the airshow.
Forum: Fuel Injection Systems 02-20-2021, 09:36 AM
Replies: 90
Views: 5,913
Posted By DanH
You do realize temperature spread has nothing to...

You do realize temperature spread has nothing to do with GAMI spread? The goal is to see them all peak at the same time, regardless of their individual indicated temperatures.
Forum: RV General Discussion/News 02-20-2021, 09:17 AM
Replies: 20
Views: 1,456
Posted By DanH
Ya'll see...

Ya'll see this?

https://twitter.com/NASAPersevere/status/1362825545227018240?s=20
Forum: RV General Discussion/News 02-20-2021, 08:35 AM
Replies: 20
Views: 1,456
Posted By DanH
Ray Walston. .

Ray Walston.
.
Forum: Fuel Injection Systems 02-19-2021, 06:24 PM
Replies: 90
Views: 5,913
Posted By DanH
Jeff, it may be best to start by realizing what...

Jeff, it may be best to start by realizing what EFI will or will not do for your RV-10. Is there a particular area of operation in which you would like better performance and control?
Forum: RV General Discussion/News 02-19-2021, 11:28 AM
Replies: 48
Views: 3,116
Posted By DanH
2021 OSH RV Social

As always, things are subject to change. However, at this time the EAA is planning for Airventure 2021. They have posted a special page at https://www.eaa.org/covid, and you should go there for...
Forum: RV Building Tips/Techniques 02-19-2021, 10:31 AM
Replies: 31
Views: 1,338
Posted By DanH
A decent airplane guy can bypass an ACS key...

A decent airplane guy can bypass an ACS key switch in about 60 seconds. I'm just sayin'...
Forum: RV General Discussion/News 02-18-2021, 08:35 AM
Replies: 13
Views: 1,245
Posted By DanH
That's a interesting drive axle. Should be easy...

That's a interesting drive axle. Should be easy to adapt into a custom tug frame of some sort. Wonder if it's possible to buy just the axle assembly and the hand control?

Two aspects to the...
Forum: RV General Discussion/News 02-17-2021, 06:11 PM
Replies: 13
Views: 1,245
Posted By DanH
What Sam said. Fire up the welder...here's your...

What Sam said. Fire up the welder...here's your towbar. I use this one with a golf cart or my pickup.
.
Forum: RV Ongoing Maintenance Issues 02-17-2021, 04:10 PM
Replies: 4
Views: 487
Posted By DanH
Jesse, I loosened the clamp and rotated the tube...

Jesse, I loosened the clamp and rotated the tube so it would wear in a new spot.
Forum: GPS 02-17-2021, 01:08 PM
Replies: 3
Views: 262
Posted By DanH
GM "Silver Birch" has not been a...

GM "Silver Birch" has not been a problem.
Forum: RV Ongoing Maintenance Issues 02-17-2021, 09:26 AM
Replies: 18
Views: 1,044
Posted By DanH
They don't need to come out very often. Last...

They don't need to come out very often. Last time mine were out was 2014.

Always thought the "A facing down" thing was dumb, not because the bleed hole (which can't be seen under the shroud) needs...
Forum: RV General Discussion/News 02-16-2021, 09:44 PM
Replies: 5
Views: 664
Posted By DanH
Pictures please?

Pictures please?
Forum: RV-7/7A 02-16-2021, 02:10 PM
Replies: 14
Views: 2,018
Posted By DanH
No way that rubber seal does not leak. Certainly...

No way that rubber seal does not leak. Certainly not long term, given hardening of rubber and mount sag.
Forum: Fuel Injection Systems 02-16-2021, 11:34 AM
Replies: 25
Views: 3,351
Posted By DanH
Well 'ole buddy, it sounds like a product idea. ...

Well 'ole buddy, it sounds like a product idea. However, I think we would want -2 lines to minimize the fuel quantity boiling out the open nozzle into the intake port after shutdown. Not a problem...
Forum: Fuel Injection Systems 02-16-2021, 09:37 AM
Replies: 25
Views: 3,351
Posted By DanH
It happens. Why do we still use hard lines here?...

It happens.

Why do we still use hard lines here? Tom, is there an equivalent ID flex line?
-
Forum: RV Ongoing Maintenance Issues 02-16-2021, 08:46 AM
Replies: 18
Views: 1,044
Posted By DanH
https://www.danhorton.net/Articles/0814_ShopTip_No...

https://www.danhorton.net/Articles/0814_ShopTip_NozzleCleaning.pdf
Forum: RV General Discussion/News 02-16-2021, 08:34 AM
Replies: 5
Views: 664
Posted By DanH
Although it may seem non-intuitive, restrict the...

Although it may seem non-intuitive, restrict the exit.

Easy to fabricate too.
Forum: RV General Discussion/News 02-15-2021, 08:16 AM
Replies: 71
Views: 12,797
Posted By DanH
Minor note. I originally wired an LED light in...

Minor note.

I originally wired an LED light in parallel with the master switch, to indicate the power was ON. First weekend, I managed to walk away from it and leave the power on, despite the...
Forum: RV Building Tips/Techniques 02-15-2021, 07:53 AM
Replies: 5
Views: 524
Posted By DanH
What Bill said. A "plenum" is just an enclosed...

What Bill said.

A "plenum" is just an enclosed air space. What we call a plenum in our little world is actually a lid to close the roof of said space, for the sole purpose of eliminating flap seal...
Forum: Fiberglass 02-14-2021, 08:35 AM
Replies: 2
Views: 450
Posted By DanH
Chris, I know countersunk glass is common, but...

Chris, I know countersunk glass is common, but AN526 screws (with nylon washers) are a more durable solution. Looks better too (small diameter) and stays that way....
Forum: RV-10 02-13-2021, 11:10 AM
Replies: 14
Views: 2,470
Posted By DanH
Mike, are those Rutan Boomerang style inlet? As...

Mike, are those Rutan Boomerang style inlet?

As others have noted, a plenum is just a lid. Details like attachment are important, but there a lots of ways to do it. The most critical factor is...
Forum: RV-14 02-11-2021, 10:36 AM
Replies: 6
Views: 777
Posted By DanH
This kind of optically flat surface is all about...

This kind of optically flat surface is all about blocking prior to application of paint.
Forum: RV-14 02-10-2021, 10:46 PM
Replies: 6
Views: 777
Posted By DanH
Best example of perfect blocking I have ever...

Best example of perfect blocking I have ever seen, Monty Barrett's 40 Ford retro rod. He handed it over to some pros who kept it for many months and did really fabulous work.

Look at the...
Forum: RV-8/8A 02-10-2021, 10:31 PM
Replies: 12
Views: 1,403
Posted By DanH
Kinda doubt the specific engine and prop choice...

Kinda doubt the specific engine and prop choice is a factor. I was thinking more about other folks with exhausts which point mostly rearward rather than down. The best clue is probably the exhaust...
Forum: RV-14 02-10-2021, 04:58 PM
Replies: 6
Views: 777
Posted By DanH
If the surface is smooth, pinhole free, and not...

If the surface is smooth, pinhole free, and not wavy, a fellow can have a presentable surface with just primer and finish paint. However, the perfect mirror finishes (no "fun house mirror"...
Forum: Traditional Aircraft Engines 02-10-2021, 09:38 AM
Replies: 6
Views: 401
Posted By DanH
You're welcome. If you really want fixed...

You're welcome.

If you really want fixed pitch, just go with the lighter parallel valve. The Vans Lycoming deals are excellent, but there is also the 370/375 option from Continental Titan, a...
Forum: Traditional Aircraft Engines 02-10-2021, 09:06 AM
Replies: 17
Views: 2,056
Posted By DanH
Closing the gap on the entry around the lower...

Closing the gap on the entry around the lower cylinder would throttle flow in that location down to pretty much the same as a closely fitted wrap. The cylinder base isn't very hot, so any loss of...
Forum: Traditional Aircraft Engines 02-10-2021, 09:01 AM
Replies: 6
Views: 401
Posted By DanH
Welcome Schuyler. 360-A is an angle valve head. ...

Welcome Schuyler.

360-A is an angle valve head. Slightly domed combustion chamber, better port angles, higher combustion rate. Externally, cylinder finning is more extensive; easier to maintain...
Forum: RV-8/8A 02-10-2021, 08:49 AM
Replies: 12
Views: 1,403
Posted By DanH
Looking for anyone who has experienced belly...

Looking for anyone who has experienced belly loose rivets at F-808.

Vans support says it's not typical, so best theory right now says it's specific to my configuration. Comparison to another...
Forum: RV General Discussion/News 02-10-2021, 08:30 AM
Replies: 4
Views: 1,271
Posted By DanH
The red ones are faster. Everybody knows that. ...

The red ones are faster. Everybody knows that. I'd estimate 10 knots. ;)
Forum: Traditional Aircraft Engines 02-09-2021, 04:10 PM
Replies: 23
Views: 1,087
Posted By DanH
8.9 CR for angle valve 390 and 580.

8.9 CR for angle valve 390 and 580.
Forum: Traditional Aircraft Engines 02-09-2021, 09:02 AM
Replies: 23
Views: 1,087
Posted By DanH
First, a reminder...the above data, and the...

First, a reminder...the above data, and the charts below, were taken under operating conditions no sensible pilot would ever accept...475 CHT, 245 oil temp, +100F IAT. It's not a natural condition;...
Showing results 1 to 64 of 500

 
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