JTEC / RADIOWAVE Support Get all your questions regarding JTEC/RADIOWAVE products answered here!

G62 Muffler

Reply

Old 06-03-2009, 07:04 AM
  #1  
jim52519
Senior Member
Thread Starter
My Feedback: (3)
 
Join Date: Apr 2005
Location: , IL
Posts: 157
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default G62 Muffler

Hi All,
I am in the market for a wrap around Pitts style muffler for a Zenoah G62. Does anyone Know how many RPM's are lost, if any, compared to open stack,with a Jtecwrap around?
I have anouther brand muffler and it knocks 500 RPM off the top. This is unacceptable for my application.
Has anyone tested the Jtec on a G62?

Jim
jim52519 is offline  
Reply With Quote
Old 06-03-2009, 07:53 AM
  #2  
al
 
al's Avatar
 
Join Date: Sep 2003
Location: mooresville, NC
Posts: 311
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: G62 Muffler

Results from Dick Pettit who wrote for R/C report as reported to us at JTEC

Just a short note with some data I collected with the new Pitts muffler. You can use
this data and photos anywhere you like.

I was running a brand new Zenoah G-62 with an APC 22-10 wide blade prop and using the
stock canister muffler. I also converted it to electronic ignition using the CH RC-EXL
unit.

Once I had about one tank of gas through it, I made some RPM and sound measurements with
the following results:

Reliable idle speed - 1250
High speed RPM - 6650
Sound level at full throttle and 25 feet - 93 db

I then pulled the Zenoah muffler off the engine and replaced it with your standard Pitts
style muffler. Same prop, same gas, same day!

Reliable idle RPM - 1200
High Speed RPM - 7050
Sound level at full throttle and 25 feet - 93 db

No difference in sound level, but 400 more RPM, which calculates out to 4 more pounds of
thrust.

And it sounds great in the air on my 97" Gee Bee Model Y as it roars past.

Thanks again!



Dick Pettit
al is offline  
Reply With Quote
Old 06-04-2011, 07:44 PM
  #3  
Thunderbolt47
Senior Member
My Feedback: (8)
 
Thunderbolt47's Avatar
 
Join Date: Oct 2002
Location: Beulaville , NC
Posts: 2,143
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: G62 Muffler

Jim, I've been running a J-tec muffler for a few months now. I just tach mine last week with a APC t-6 racing prop . it was turning 7400 on the ground. I had a Slim line on it before and it would tach out at 7200/7300. This combo pulls my T/F Mustang around at 125mph. I am pleased with it's performance. However I've have a heck of a time keeping it tight at those rpms. The prop and spinner are balanced.
Hope this helps
Kelly

Thunderbolt47 is offline  
Reply With Quote
Old 10-06-2011, 10:56 AM
  #4  
rt3232
My Feedback: (6)
 
Join Date: Dec 2004
Location: hastings, MN
Posts: 5,953
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: G62 Muffler



T/bolt47

having run a pair of G-62 std mag congig for the last 7/8 years to keep all wrap arround mufflers tight add a third attach point on the oopsite side so they shake the same

Cheers Bob T
rt3232 is offline  
Reply With Quote

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


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service