Notices
Glow Engines Discuss RC glow engines

Welcome to Club SAITO !

Old 10-21-2019, 03:13 AM
  #42926  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Lonnie, not to be a bad guy, but it's pretty well established that there is no chrome on the Saito valve seats.
Old 10-21-2019, 03:14 AM
  #42927  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Originally Posted by Captcrunch44

yup
those were some serious engine’s to bad they don’t make them anymore
Jim, I have a Tartan 1.34 single with a Davis Diesel head on it.
Old 10-21-2019, 03:17 AM
  #42928  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Originally Posted by Hobbsy
Lonnie, not to be a bad guy, but it's pretty well established that there is no chrome on the Saito valve seats.
Ok Dave, if true I'll edit my post. If no chrome on the seats then why all the cautions about lapping them? I've read in more than one thread that it's ok to lap bronze seats but not ok to lap the aluminum seats because they are chromed. Bad info?

Last edited by Glowgeek; 10-21-2019 at 03:24 AM.
Old 10-21-2019, 03:35 AM
  #42929  
 
Join Date: Aug 2007
Location: dysart, IA
Posts: 1,730
Received 7 Likes on 7 Posts
Default

The cylinders that have worked on they sure don’t look like they have Crome on the seats
Old 10-21-2019, 03:40 AM
  #42930  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Bill Robinson says the AAC cylinders have a thin chrome plating over the aluminum seats. He had a pretty good idea of what Saitos are all about.

http://www.rcuniverse.com/forum/glow...l-robison.html
Old 10-21-2019, 03:41 AM
  #42931  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default



Lower left by Clarence Lee, I think.
Personally, I never lap lap any of them, I have yet to see one that needed it. I've seen plenty of high time engines. Note compression ratio, it's the one I have.
Old 10-21-2019, 03:44 AM
  #42932  
 
Join Date: Aug 2007
Location: dysart, IA
Posts: 1,730
Received 7 Likes on 7 Posts
Default

Ok you calculating people out there I came across a whole bunch of fuel a while back. Most of the fuel is 22% oil. And 30 % nitro. I would like to cut the nitro in half by blending methanol with the fuel. How much oil do I need to add back in to bring the oil content back up to 16%?
Old 10-21-2019, 03:48 AM
  #42933  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Crunchy, this calculator comes in handy when mixing or altering fuels.

NitroRC.com | Fuel Mixture Workshop
Old 10-21-2019, 03:50 AM
  #42934  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Man oh man, I haven't had half my coffee yet.

Mike, could you or anyone use an extra cast 120/180 muffler, I have two extras, one is brand new.
Old 10-21-2019, 03:55 AM
  #42935  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Originally Posted by Glowgeek
Bill Robinson says the AAC cylinders have a thin chrome plating over the aluminum seats. He had a pretty good idea of what Saitos are all about.

http://www.rcuniverse.com/forum/glow...l-robison.html

Us friends of his lovingly called him Way Out Willy, he missed the boat on that one. I think I have a busted 150 cylinder to saw apart, Gary may have one sawed apart already.
Old 10-21-2019, 03:55 AM
  #42936  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Dave, sure the seats are machined directly into the casting on later AAC cylinders as noted by Lee. The question is whether or not Saito machined the seats before or after chrome plating, surely before plating, and whether or not they masked off the seats/chamber before plating....I doubt they did. I think the general consensus is that the aluminum seats are plated along with the rest of the cylinder wall.

PS, I could be wrong on this subject along with most others out there with the same opinion and I would have no problem admitting it, as you all know. If there is no chrome on the aluminum valve seats because Saito has deemed it unnecessary I have an 82 that I would love to lap a little. The exhaust seat has never been right on that one.

Last edited by Glowgeek; 10-21-2019 at 04:16 AM.
Old 10-21-2019, 04:29 AM
  #42937  
 
Join Date: Aug 2007
Location: dysart, IA
Posts: 1,730
Received 7 Likes on 7 Posts
Default

Originally Posted by Hobbsy
Man oh man, I haven't had half my coffee yet.

Mike, could you or anyone use an extra cast 120/180 muffler, I have two extras, one is brand new.
dave yes I am always looking for spare muffler’s.
Like this 125 I have it’s missing. Like prop nuts man they don’t get sent with the engine vary often. Tru Turn is going to love me before long.
Old 10-21-2019, 05:24 AM
  #42938  
 
Jesse Open's Avatar
 
Join Date: Mar 2018
Location: 30 Miles North of Canada Border
Posts: 3,867
Received 95 Likes on 87 Posts
Default

For many years I had assumed the AAC Saito seats were plated. (Based on Silly Willy) Had not even given it much thought. Had I thought about it, I would have had doubts. In fact they are not.

Yes, I have and still do resurface the seats. I use a Comet Cleanser paste for fast cutting and Simichrome metal polish for fine finishing. For general light clean up I have always used a rubber pencil eraser, often with a touch os Simichrome.

Yes, there are many cases where the lapping has saved an otherwise doomed cylinder. I prefer to use a dummy valve made from hardened drill rod for tougher jobs or perhaps a throw away valve. Too much lapping will cut a groove into the valve. Do the light finish work only with the valve that will be used in the running engine.

The valve action itself tends to hammer form the seat and work harden it at the same time.
Old 10-21-2019, 05:53 AM
  #42939  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Originally Posted by Jesse Open
For many years I had assumed the AAC Saito seats were plated. (Based on Silly Willy) Had not even given it much thought. Had I thought about it, I would have had doubts. In fact they are not.

Yes, I have and still do resurface the seats. I use a Comet Cleanser paste for fast cutting and Simichrome metal polish for fine finishing. For general light clean up I have always used a rubber pencil eraser, often with a touch os Simichrome.

Yes, there are many cases where the lapping has saved an otherwise doomed cylinder. I prefer to use a dummy valve made from hardened drill rod for tougher jobs or perhaps a throw away valve. Too much lapping will cut a groove into the valve. Do the light finish work only with the valve that will be used in the running engine.

The valve action itself tends to hammer form the seat and work harden it at the same time.


I dunno if this says anything, but the seat is not shiny like chrome would be.
Old 10-21-2019, 06:05 AM
  #42940  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Originally Posted by Captcrunch44


dave yes I am always looking for spare muffler’s.
Like this 125 I have it’s missing. Like prop nuts man they don’t get sent with the engine vary often. Tru Turn is going to love me before long.

Okey dokey, I'll send one, as to the 1.25 I can't help there, at 13 mm it's the odd man out.
Old 10-21-2019, 06:16 AM
  #42941  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Dave, Gary, Crunchy, thank for setting me straight on the aluminum seats. Unplated it is!
Old 10-21-2019, 06:59 AM
  #42942  
 
Jesse Open's Avatar
 
Join Date: Mar 2018
Location: 30 Miles North of Canada Border
Posts: 3,867
Received 95 Likes on 87 Posts
Default

Don't be embarrassed! Like I said, I had said and treated them as plated for years. Actually defied common sense. The heat and impact would delaminate most any plating. I figured Saito must have had an advanced process of some kind. I should have known.
Old 10-21-2019, 07:02 AM
  #42943  
 
Jesse Open's Avatar
 
Join Date: Mar 2018
Location: 30 Miles North of Canada Border
Posts: 3,867
Received 95 Likes on 87 Posts
Default

Dave, if one is left, I could use a cast big block muffler too.
Old 10-21-2019, 07:55 AM
  #42944  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

I do have, shoot me your correct address, I started a folder to keep them in, I made a mistake the last time.
Old 10-21-2019, 08:01 AM
  #42945  
My Feedback: (6)
 
FlyerInOKC's Avatar
 
Join Date: Nov 2004
Location: Oklahoma City, OK
Posts: 14,248
Received 281 Likes on 243 Posts
Default

Is there a source for Jam and prop nuts and thrush washers other than Horizon? I have tried doubling up nuts and using washers from Ace Hardware but success has been spotty at best.
Old 10-21-2019, 08:22 AM
  #42946  
My Feedback: (102)
 
Hobbsy's Avatar
 
Join Date: Dec 2001
Location: Colonial Beach, VA
Posts: 20,370
Likes: 0
Received 25 Likes on 25 Posts
Default

Macgregor has none, Horizon has some, it's spotty.
Old 10-21-2019, 08:31 AM
  #42947  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

Google "Class 10 Metrix Nut" in whatever size you're interested in. I get them for 25-35 cents a piece. I don't have any of those special two piece prop locking nuts, none of the preowned engines I bought came with them.
Old 10-21-2019, 08:41 AM
  #42948  
My Feedback: (6)
 
FlyerInOKC's Avatar
 
Join Date: Nov 2004
Location: Oklahoma City, OK
Posts: 14,248
Received 281 Likes on 243 Posts
Default

Thanks guys!
Old 10-21-2019, 10:26 AM
  #42949  
 
Jesse Open's Avatar
 
Join Date: Mar 2018
Location: 30 Miles North of Canada Border
Posts: 3,867
Received 95 Likes on 87 Posts
Default

Originally Posted by FlyerInOKC
Is there a source for Jam and prop nuts and thrush washers other than Horizon? I have tried doubling up nuts and using washers from Ace Hardware but success has been spotty at best.

I know most feel little incentive to lay out a few dollars in cash or perhaps allot some space, but a lathe is a surprisingly useful resource. Often cost less than putting a medium trainer in the air, they run for a lifetime and open up a new world of opportunity to supply useful, unique parts and devices to enhance the hobby.

I cannot remember the last time I had to buy a prop nut. I get a perfect fit every time. Metric hex stock is cheap and a bar lasts for many parts. Jam nuts and flare nuts at a moments notice. No waiting for mail order, no trip to the hobby shop. And parts that you cannot buy anywhere else.

Bearing installation mandrel


Vent elbow


Various elbows




The quiet muffler


Brass prop nut


Lathe turned velocity stack and a screwdriver locater for the idle needle.


Custom muffler


And , yes, a custom spinner nut. One of dozens, including custom lock nuts.


Metric hex stock from Metrics Unlimited.
Old 10-21-2019, 11:14 AM
  #42950  
 
Join Date: Feb 2016
Posts: 3,651
Received 65 Likes on 65 Posts
Default

All nicely made parts Gary, you have a real talent. That lsn screwdriver guide is a great idea.

Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.