Go Back  RCU Forums > RC Airplanes > Questions and Answers
 In-cowl priming >

In-cowl priming

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

In-cowl priming

Thread Tools
 
Search this Thread
 
Old 10-27-2004 | 01:03 AM
  #1  
Thread Starter
Senior Member
 
Joined: Sep 2004
Posts: 140
Likes: 0
Received 0 Likes on 0 Posts
From: Athens, GREECE
Default In-cowl priming

Can anybody help me with this one? How do you prime an engine if you can't cover the carb with your finger? Do you have to do it before attaching the cowl or is there another way? Thanks
Old 10-27-2004 | 04:57 AM
  #2  
njl
Member
 
Joined: May 2003
Posts: 54
Likes: 0
Received 0 Likes on 0 Posts
From: Twyning, UNITED KINGDOM
Default RE: In-cowl priming

If you can't get at the carb, assuming that the exhaust is exposed you can put your finger over the end
and prime the engine by turning it over on the starter for a few seconds with the throtle open. That will
do the job for you.

Nick
Old 10-27-2004 | 06:04 PM
  #3  
Senior Member
My Feedback: (16)
 
Joined: Apr 2002
Posts: 12,942
Likes: 0
Received 0 Likes on 0 Posts
From: Locust Grove, GA
Default RE: In-cowl priming

Yes, cover the exhaust and you will force fuel into the carb!
Old 10-27-2004 | 06:58 PM
  #4  
Senior Member
 
Joined: Nov 2002
Posts: 2,251
Likes: 0
Received 0 Likes on 0 Posts
From: Crete, IL
Default RE: In-cowl priming

A finger over the exhaust works fine assuming there is a pressure line from the muffler to the fuel tank. I wouldn't suggest using a starter to turn the engine over while doing this though. Turn it over by hand two or three times with the throttle open.
Old 10-27-2004 | 10:33 PM
  #5  
 
Joined: Feb 2003
Posts: 1,244
Received 0 Likes on 0 Posts
From: Toronto, ON, CANADA
Default RE: In-cowl priming

Occasionally I will hold a finger over the exhaust while cranking to start but only for a second or three. If it still won't start, then there's a problem in that fuel is just not getting to the engine.

Look for air leaks in the fuel lines to the needle or between the needle and the carb. You probably can't see a hole/crack but tubing is cheap. Just replace it and try again.
Old 11-06-2004 | 01:12 PM
  #6  
pt19 flyer's Avatar
Senior Member
My Feedback: (1)
 
Joined: Nov 2002
Posts: 489
Likes: 0
Received 0 Likes on 0 Posts
From: Roanoke, VA
Default RE: In-cowl priming

hi serafim

easy, just put finger over end of muffler and flip prop briskly 4 or 5 times, then remove finger and flip prop about 5 or 6 times. attach igniter and go to about 1/4 throttle and let her rip.

this works fine with me
good luck and happy flying;

pt19 flyer
Old 11-06-2004 | 02:12 PM
  #7  
ballgunner 's Avatar
Senior Member
My Feedback: (1)
 
Joined: Feb 2003
Posts: 2,141
Likes: 0
Received 0 Likes on 0 Posts
From: Payson, AZ
Default RE: In-cowl priming

You should NEVER put your finger over the exhaust while turning the engine with a starter. A few flips by hand with the carb open will do the job. Assuming the exhaust has a pressure outlet connected to the tank you can blow things apart if you turn the engine too fast, as with a starter. This is especially true with 4 strokes but can apply to 2 strokes as well.
The method described by pt19flyer works best and with less risk.
Old 11-06-2004 | 02:35 PM
  #8  
 
Joined: Feb 2003
Posts: 1,244
Received 0 Likes on 0 Posts
From: Toronto, ON, CANADA
Default RE: In-cowl priming

ORIGINAL: ballgunner

You should NEVER put your finger over the exhaust while turning the engine with a starter. A few flips by hand with the carb open will do the job. Assuming the exhaust has a pressure outlet connected to the tank you can blow things apart if you turn the engine too fast, as with a starter. This is especially true with 4 strokes but can apply to 2 strokes as well.
The method described by pt19flyer works best and with less risk.

No doubt. I do believe you. However, when its about putting yo finger over da hole, it's on there for an instant, something like this:

The burner on your stove is on but you don't know if it's working or not. You ever-so-briefly touch the element with your finger and pull it away. That's how long I cover the exhaust hole. No boom yet [>:]
Old 11-06-2004 | 05:59 PM
  #9  
Senior Member
 
Joined: Jun 2003
Posts: 711
Likes: 0
Received 0 Likes on 0 Posts
From: Guelph, ON,
Default RE: In-cowl priming

You can also squirt a bit of fuel directly into the carb and once the engine starts it will draw fuel. I have to do it like this for my on plane where it has a rubber coupler on the muffler and the coupler just expands when trying to prime with exhaust pressure.

Tom
Old 11-12-2004 | 11:34 PM
  #10  
pt19 flyer's Avatar
Senior Member
My Feedback: (1)
 
Joined: Nov 2002
Posts: 489
Likes: 0
Received 0 Likes on 0 Posts
From: Roanoke, VA
Default RE: In-cowl priming

hi voyager

da hole ain't gonna be dat hot. don't know of anyone every getting burned here.

good luck and happy flying

pt19 flyer

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



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

Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.