Go Back  RCU Forums > RC Airplanes > Questions and Answers
 Info on a .25 BRAT engine? >

Info on a .25 BRAT engine?

Notices
Questions and Answers If you have general RC questions or answers discuss it here.

Info on a .25 BRAT engine?

Old 07-26-2006, 06:43 PM
  #1  
Thread Starter
 
Join Date: Jul 2006
Location: townsend, GA
Posts: 927
Likes: 0
Received 0 Likes on 0 Posts
Default Info on a .25 BRAT engine?

A good friend gave me this engine it runs GREAT!!!!!!!!! It looks brand new. All it says on it is .25 BRAT. On the front of the carb says N.S. Any info would be great type of props, r.p.m range, age, ect... Thanks for your time
Old 07-26-2006, 07:15 PM
  #2  
 
Join Date: Jun 2006
Location: pembroke, NH
Posts: 2,985
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Info on a .25 BRAT engine?

it was made for world engines after john maloney sold the import rights for os and super tiger engines to great planes.this was about the mid eightes.should have the smae rpm range of the os 25 fp.he also imported a bluebird engine and the beginning of the asp line before his death.
Old 07-26-2006, 08:31 PM
  #3  
Thread Starter
 
Join Date: Jul 2006
Location: townsend, GA
Posts: 927
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Info on a .25 BRAT engine?

Thanks for the info. I have never built anything small enough for a .25 not sure what to put it in? Something VERY SMALL AND VERY VERY FAST maybe a nice delta?
Old 07-26-2006, 08:39 PM
  #4  
My Feedback: (90)
 
TLH101's Avatar
 
Join Date: Dec 2001
Location: Elephant Butte, N.M.
Posts: 6,716
Likes: 0
Received 2 Likes on 2 Posts
Default RE: Info on a .25 BRAT engine?

I have a Sig Wonder that it would do "wonders" in.
Old 07-25-2016, 02:18 PM
  #5  
 
1QwkSport2.5r's Avatar
 
Join Date: Oct 2006
Location: Cottage Grove, MN
Posts: 10,420
Received 78 Likes on 71 Posts
Default Brat .25

Warning: Major and to-bump!!

I was recently given this engine - no idea of when it was made, though I know they weren't made for very long. I did a little research on the Brat/Blue Bird engines that World engines sold and later Indy R/C. This one is a .25, and like most Brat/Blue Birds is AAC. This one wasn't run much - if it even ran... Probably hard to when the wristpin started to eject itself out of the piston enough to ding a transfer port. Apparently the circlip either never was installed or it got lost in the mail.. . Anyway, I didn't pay anything for the engine and as such have nothing to lose, so I robbed a circlip from a junk engine and installed it, and then for good measure, packed the wristpin and edge of the piston with JB Weld. This method has worked wonders on other junk engines, so I see no harm in it. Parts are impossible to get for these guys. The piston/liner fit is pretty snug, so when I can give it a run, I'll break it in and if it survives that, I'll put a diesel head on it. They're supposed to be "rough" copies of the OS FSR engines, so I'll put my Davis Diesel head on it and see if she'll diesel worth a crap. My .25 FSR isn't in that great of shape for running on diesel, so why not.

Mine has the big carb that some have said can be problematic - I can see why on a few things... The choke diameter is 7mm - pretty big for running on suction I think... The other thing I noticed is the barrel is slightly misaligned due to a possible too-small barrel guide screw or maybe the barrel guide too wide. Easily repaired, but I'll deal with that if it survives a few rich fast runs. The ports are cut decent - not as rough as some have said their examples were...

I didn't see that this wasn't originally posted in the Engines section. If a Moderator reads this, could the thread be moved to Glow Engines?
Attached Thumbnails Click image for larger version

Name:	image.jpeg
Views:	36
Size:	2.06 MB
ID:	2174408   Click image for larger version

Name:	image.jpeg
Views:	41
Size:	2.18 MB
ID:	2174409  

Last edited by 1QwkSport2.5r; 07-25-2016 at 02:36 PM.
Old 07-26-2016, 11:35 AM
  #6  
 
Join Date: Sep 2012
Location: , CA
Posts: 128
Likes: 0
Received 0 Likes on 0 Posts
Default

It looks cool! The carb is nearly as large as the cylinder. I hope it diesels well.
Old 07-26-2016, 03:22 PM
  #7  
 
1QwkSport2.5r's Avatar
 
Join Date: Oct 2006
Location: Cottage Grove, MN
Posts: 10,420
Received 78 Likes on 71 Posts
Default

Originally Posted by AwwNaww
It looks cool! The carb is nearly as large as the cylinder. I hope it diesels well.
Yeah, the carb is huge for a .25!! I don't think some of my .46s even have carb's that big. I will run the engine in hopefully in the next couple days. For being a 30yr old Taiwanese, it seems to be a better made example... We'll see.
Old 07-27-2016, 07:43 AM
  #8  
 
aspeed's Avatar
 
Join Date: Jul 2011
Location: Ruthven, ON, CANADA
Posts: 3,460
Likes: 0
Received 7 Likes on 7 Posts
Default

As I mentioned in another forum? My .25 had a G clip failure and it scored the piston cyl. I guess that is a problem with them. I got it for $15 at a swap meet thinking I could use it for parts on another Brat that I bought new likely in the mid 1980s. I believe it was about $50 at the time which was quite reasonable for a schnuerle BB motor which was the new thing. Nothing fit between the two. I still have not run either one. The .21 has a heat sink head and a pull start, and looks quite well made. I just never bothered to make a backplate for it yet. Maybe in another 30 years. It did come with a slick little primer bulb. From my little diesel experience, I think they are happier with small carbs. They normally don't rev as high, so it is not needed, plus it gives better suction and reliability.

Last edited by aspeed; 07-27-2016 at 07:52 AM.
Old 07-27-2016, 09:06 AM
  #9  
 
1QwkSport2.5r's Avatar
 
Join Date: Oct 2006
Location: Cottage Grove, MN
Posts: 10,420
Received 78 Likes on 71 Posts
Default

Originally Posted by aspeed
As I mentioned in another forum? My .25 had a G clip failure and it scored the piston cyl. I guess that is a problem with them. I got it for $15 at a swap meet thinking I could use it for parts on another Brat that I bought new likely in the mid 1980s. I believe it was about $50 at the time which was quite reasonable for a schnuerle BB motor which was the new thing. Nothing fit between the two. I still have not run either one. The .21 has a heat sink head and a pull start, and looks quite well made. I just never bothered to make a backplate for it yet. Maybe in another 30 years. It did come with a slick little primer bulb. From my little diesel experience, I think they are happier with small carbs. They normally don't rev as high, so it is not needed, plus it gives better suction and reliability.
Yeah, I know they don't need big carb's. I'd change the carb for running on diesel. I was gonna run it on glow fuel for a few runs to break it in - if it survives that.

This engine is more of an experiment than anything - rumors say they wear out quickly and blow rods... I'll be getting a new P/L for the FSR, so this thing will likely end up on the drawer after I beat it up a bit. It was a freebie anyway.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are On


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.