Notices
O.S. Engines Support Ask Bill Baxter your questions about O.S. Engines.

.70 Surpass II

Old 07-04-2010, 02:12 PM
  #1  
Thread Starter
My Feedback: (193)
 
Join Date: Feb 2002
Location: Parrish, FL
Posts: 475
Likes: 0
Received 0 Likes on 0 Posts
Default .70 Surpass II

Hi Bill. Thanks for the great service and advice over the years. Here's a question for you on my LOW-TIME 70 Surpass II. First, it runs fine, is very strong, and I'm running it mounted on a 45 degree angle in a Reactor. Perfect setup. I use Cool Power 20-20 heli fuel, and always run on the rich side. OSF plug, 14-4 APC. I get a great smoke trail among other benefits. Last six flights were great, good power, easy start, etc. I have about 20 flights on this aircraft, and the engine seems to get stronger every outing. However... today, when inspecting the plug and adding after run oil, I noticed a distinct LOUD clicking sound when the piston hit TDC. Turning the prop slowly in both directions resulted in the same sound. The engine turns free otherwise, bearings are smooth, etc. I pulled the valve cover for the first time, and all looks normal. Any ideas or suggestions? What the heck is causing that noise? Should I run the engine?

Thanks again, Tony Iannucelli
Old 07-06-2010, 09:18 AM
  #2  
Bax
My Feedback: (11)
 
Join Date: Apr 2002
Location: Monticello, IL
Posts: 19,483
Likes: 0
Received 6 Likes on 5 Posts
Default RE: .70 Surpass II

Very likely, you are hearing the cam followers come off the cam. It has a steep slope, so the lifters will "fall" when the cam rotates out from under them. A "clinking" noise is common in model four-stroke engines.

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.