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Electronic solutions to modifying glow engines of all sizes to gasoline

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Electronic solutions to modifying glow engines of all sizes to gasoline

Old 08-09-2022, 08:05 AM
  #326  
1967brutus
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Originally Posted by Cat 1 View Post
https://www.youtube.com/watch?v=ubbm_OwzTWA

Here is video from flying last nite - Sorry for the flying it was a very "solid" wind and the Kavalier is not the best windy day machine.. engine ran the best ever.. still a bit on the rich side in a couple of the clips.

Two things of note -
It ran forever on 4 oz of fuel - With the video I took it was over 18 minutes I think. I was trying to "run it out" but then the wind picked up more and I decided not to tempt fate and end up on a long walk. (got tired too) I'm sure I could easily fly for 30 minutes at reduced power settings.
Its running very clean now - Residue is very light and very transparent.
Finally saw the vid with sound (my workstation doesn't have speakers and subtitles don't help much ) and I have to say, that engine runs like a champ!
Old 08-09-2022, 09:30 AM
  #327  
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Originally Posted by 1967brutus View Post
Save the glow engine!!!
They make such marvellous gassers!
they do.
Old 08-09-2022, 11:35 AM
  #328  
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Originally Posted by Raleighcopter View Post
they do.
I tried telling everyone... I really tried...
Old 08-09-2022, 11:56 AM
  #329  
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So now you know what to do, make a generic carb throttle body available, with venturi and thermal insulator inserts for the various displacement engines... who knows the hobby engine industry maybe watching
Old 08-09-2022, 12:25 PM
  #330  
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Originally Posted by John_M_ View Post
So now you know what to do, make a generic carb throttle body available, with venturi and thermal insulator inserts for the various displacement engines... who knows the hobby engine industry maybe watching
Still too many variables in carb attachments to the engine and such for me to make that viable.
Maybe if I had my own CNC equipment and a CAD/CAM library containing every engine coming on my path, but even then....
Old 08-09-2022, 12:27 PM
  #331  
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Just start with a suitable ft160 tbi carb and go from there. 😁😁😁
Old 08-09-2022, 01:07 PM
  #332  
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Default plastic carb body.

There is no absolute requirement that a carburator body has to be made from metal.
The perry carburators for example have a plastic body (nylon?)
It should be possble to 3d print a body with the hole for the barrel undersized and then drill that for the correct clearance of the barrel.
No cnc router needed just a drill press.


Old 08-09-2022, 02:40 PM
  #333  
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I've only had one engine with a Perry carb. As I recall it had a plastic carb body with a brass liner.
Old 08-09-2022, 07:37 PM
  #334  
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Originally Posted by 1967brutus View Post
I tried telling everyone... I really tried...
Some of us listened - And some of us have "saved" so many we wonder if we have an addiction problem!!! I have tried to keep all of mine piled together on one shelf as a visual reminder to stop this madness, but more keep mysteriously arriving..

Originally Posted by Raleighcopter View Post
Just start with a suitable ft160 tbi carb and go from there. 😁😁😁
Stand By!!!

Originally Posted by cmulder View Post
There is no absolute requirement that a carburator body has to be made from metal.
The perry carburators for example have a plastic body (nylon?)
It should be possble to 3d print a body with the hole for the barrel undersized and then drill that for the correct clearance of the barrel.
No cnc router needed just a drill press.
I agree - unfortunately I don't have the right Machine or process for this - Thinking a resin printer with a carefully selected material would be in order - Might try Delrin for the body of the next "machined one" though.

Originally Posted by Glowgeek View Post
I've only had one engine with a Perry carb. As I recall it had a plastic carb body with a brass liner.
I have a few Perry's here and I don't think any have a brass liner (will check) - I do recall this though.


Old 08-09-2022, 08:28 PM
  #335  
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Sooooo... Remember that engine problem I mentioned earlier - A quick search turned up 5 Perry's... Here is the skinny on two comparable ones. One is off a "converted" OS 61FSR (smaller bore) and one off a K&B 61 Pumped (larger bore) - both are correct for the engines they were on.

The smaller bore carb appears newer and differs in an aluminum outlet tube and an aluminium (vs brass) metering disk. I think the aluminum neck is "molded" in as the body is formed. The plastic is hard - very much like Acetal or Delrin. - could be nylon but a very hard version. The barrels are brass but run straight in the plastic bore on all I have here. Its a neat and simple design but I haven't run one for years so I can't comment on how well they run or adjust as I don't have much time with one. Some guys swore by them.

Here is a neat finding - Both bodies are the same size - but the bore in one is +9mm and the other one is 7mm - they take care of this by a simple chamfer which makes the bore transition oval and it does not really match up with the body bore - I avoided doing this with my bore reduction as I thought it might cause issues but seeing how it works, I don think it would. On mine I pressed a bore reducer in and then spent time hand carving the transition with an x-acto to make the matchup work as I knew a "camfer bit" would make an oval...






Think I am going to try plastic on the next body -
Old 08-09-2022, 11:31 PM
  #336  
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Interesting development!
Old 08-10-2022, 03:56 AM
  #337  
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No brass liner in a Perry carb. Thanks.

My memory serves me poorly, more so as time passes.
Old 08-10-2022, 04:18 AM
  #338  
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Originally Posted by Glowgeek View Post
No brass liner in a Perry carb. Thanks.

My memory serves me poorly, more so as time passes.
i have seen the plastic with a liner arrangement. But I can’t remember where. Maybe it wasn’t a perry as there were a few copies of the “plastic carb” floating around
Old 08-10-2022, 05:03 AM
  #339  
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Originally Posted by Cat 1 View Post
i have seen the plastic with a liner arrangement. But I can’t remember where. Maybe it wasn’t a perry as there were a few copies of the “plastic carb” floating around
Thanks Chris, I feel vindicated........kind of.

Back to the shop to work on my current project.


Saito 200TI

Low time engine but arrived with a stripped out glow plug and improperly timed cams. The Timesert 1/4-32 thread repair kit arrived yesterday, $$$$$. Pretty excited about moving forward with this engine. Eventually I'll attempt to make custom exhaust from thin wall brass tubing. The Rcexl twin ignition arrived as well, just waiting for delivery of the sensor bracket and magnet ring from CH Ignitions to compete the gas conversion.



Last edited by Glowgeek; 08-10-2022 at 01:11 PM.
Old 08-10-2022, 09:54 AM
  #340  
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I believe the metal sleeved plastic carbs were on some of the buggy slide carbs... I remember seeing posted somewhere a plastic carb with a sleeved throttle barrel bore... Perry claims their carb bodies are injection molded black reinforced nylon, and with proper clearances between the brass throttle barrel and plastic bore, should not show any wear, not with the oil content in the fuel.
Old 08-11-2022, 04:37 PM
  #341  
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new printer arrived and I got it assembled. Filament arrives tomorrow and the new extruder and bed leveling kit are in customs. Hope to be printing by the weekend.
Old 08-11-2022, 05:25 PM
  #342  
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Nice Dave! Where is the green with envy emoticon?

Last edited by Glowgeek; 08-11-2022 at 05:52 PM.
Old 08-11-2022, 05:37 PM
  #343  
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Default Timesert?

My 200TI glow plug thread repair did not go as planned. The hole had been previously repaired with a Timesert, or so I thought, but the Timesert 1/4-32 glow plug inserts I bought are too small in OD. The OD of the broken threads I removed from the hole are .312 OD, the Timeserts I purchased are .286 OD.

Timesert does make an insert called a "Bigsert" however they are not available online for 1/4-32. Not listed on the Timesert webpage either.

Is there another brand of insert that looks like, and locks in place just like a Timesert?
Old 08-11-2022, 06:50 PM
  #344  
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Bummer!
Old 08-11-2022, 10:23 PM
  #345  
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Originally Posted by Raleighcopter View Post
new printer arrived and I got it assembled. Filament arrives tomorrow and the new extruder and bed leveling kit are in customs. Hope to be printing by the weekend.
So you choose the filament type, probably will be more versatile in the long run... looks like a decent printer.
Old 08-11-2022, 10:33 PM
  #346  
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Originally Posted by Glowgeek View Post
My 200TI glow plug thread repair did not go as planned. The hole had been previously repaired with a Timesert, or so I thought, but the Timesert 1/4-32 glow plug inserts I bought are too small in OD. The OD of the broken threads I removed from the hole are .312 OD, the Timeserts I purchased are .286 OD.

Timesert does make an insert called a "Bigsert" however they are not available online for 1/4-32. Not listed on the Timesert webpage either.

Is there another brand of insert that looks like, and locks in place just like a Timesert?
Make your own threaded insert from some brass rod...Drill and tap the 1/4-32 ID, then cut the OD threads with the appropriate thread Die... the only issue you'll be faced with is crowding the valve seats, but you can bias the oversize plug away from the valve seats... then just use red loc-tite on the brass threaded insert... you won't need it to be swaged in place like the time-serts.
Old 08-11-2022, 11:53 PM
  #347  
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Looks like Big-Sert only makes a 1/4-28 oversized insert... Why they don't make a 1/4-32 is puzzling.
Old 08-12-2022, 02:20 AM
  #348  
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Originally Posted by John_M_ View Post
Make your own threaded insert from some brass rod...Drill and tap the 1/4-32 ID, then cut the OD threads with the appropriate thread Die... the only issue you'll be faced with is crowding the valve seats, but you can bias the oversize plug away from the valve seats... then just use red loc-tite on the brass threaded insert... you won't need it to be swaged in place like the time-serts.
Had thought of that John. The threads in the cylinder are already cut for 5/16-32. No dies available for that. The bore for that threading is already the max before valve seat interference/heat transfer becomes an issue. What I need at this point is to find the insert manufacturer the hole was drilled and tapped for, or have someone machine a custom insert. I don't have a metal lathe at my disposal.

As far as I've been able to research, Timesert is the only insert manufacturer that uses opposing matched threading for ID and OD. I.e. the same thread pitch for internal and external threads. Going to give them a call today. Maybe there is a Bigsert kit (1/4-32) that they can provide but don't advertise. Worth a try.

Last edited by Glowgeek; 08-12-2022 at 03:02 AM.
Old 08-12-2022, 02:52 AM
  #349  
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Post try "prusa slicer"

Originally Posted by Raleighcopter View Post
new printer arrived and I got it assembled. Filament arrives tomorrow and the new extruder and bed leveling kit are in customs. Hope to be printing by the weekend.
Try www.prusa3d.com/page/prusaslicer_424/

Its is free and most likely already has the presets "profile" for your printer included.
Also
Depending on the type of filament best keep it in a sealed (ziplock) bag when you are not using it to keep it from absorbing humidety.
A glue stick like "pritt" is usefull as a base coat on your print bed in case the print does not stick well and also a protecting layer if it stick too well.
It cleans with water and soap if it build up to much.

This model is designed to confirm if your printer is working well or shows where adjustments are needed.
Benchy the boat

Enjoy
Old 08-12-2022, 05:07 AM
  #350  
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i've installed Cura slicer since that's what Cat1 is using and he's been helping/answering questions for me. i've got a roll of PLA and a roll of ASA coming today and should be printing a benchmark model today. i need to tighten the build platform because it has some play in it and the CR touch for bed leveling and direct extruder I ordered will be here in a few days hopefully.

it's a well built piece of kit and i'm trying to resist printing all sorts of upgrades for it like cable chains and whatnot.

i have a couple friends who also 3d print and they've been pointing me towards resources and giving advice, especially the advice to keep filament dry.


Last edited by Raleighcopter; 08-12-2022 at 05:12 AM.

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