 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
clemwehner
Joined: 02 Feb 2009
Posts: 32
|
 Posted: Sun Feb 21, 2016 9:39 pm Post subject: Tachometer reads high |
 |
|
I just started my KFIV- 912 engine today for the first time after 24 years of building. It ran great. But, the little Sendek FS-500 digital tach I use as a cross check reads high. When the Rotax Tach is at 2000, the Sendek is roughly the same, but get progressively higher as the engine speed increases. When the Rotax tach is at 4000, the Sendek reads 8500 rpm. I have the Sendek tach set to mode P1 which is one pulse per revolution, which the company website says is correct for the 912 engine. The Sendek uses one wire with 4 wraps around one spark plug wire to pick up the spark pulse.
Anybody have any ideas why? I'd appreciate your thoughts, because this dummy is stumped.
Clem Wehner
Lawton, OK
KFIV-912 , #1461.
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Clem
Oklahoma
Kitfox IV-912, under construction since 1991 |
|
| Back to top |
|
 |
Jim Shumaker
Joined: 09 Jan 2006
Posts: 106
|
| Posted: Sun Feb 21, 2016 10:20 pm Post subject: Tachometer reads high |
|
|
The shielded ignition cables make for problems with the wire wrap. I never got it to work. Also found the analog tach that came with the rotax engine was temperature sensitive and would give different rpms depending on what altitude I was flying. Threw them both away and got a digital that connected to the pickup wires.
Jim Shumaker
Kitfox III #872
Rotax 912 1200 hours
On Sunday, February 21, 2016 10:12 PM, "clemwehner(at)sbcglobal.net" <clemwehner(at)sbcglobal.net> wrote:
I just started my KFIV- 912 engine today for the first time after 24 years of building. It ran great. But, the little Sendek FS-500 digital tach I use as a cross check reads high. When the Rotax Tach is at 2000, the Sendek is roughly the same, but get progressively higher as the engine speed increases. When the Rotax tach is at 4000, the Sendek reads 8500 rpm. I have the Sendek tach set to mode P1 which is one pulse per revolution, which the company website says is correct for the 912 engine. The Sendek uses one wire with 4 wraps around one spark plug wire to pick up the spark pulse.
Anybody have any ideas why? I'd appreciate your thoughts, because this dummy is stumped.
Clem Wehner
Lawton, OK
KFIV-912 , #1461.
| | - The Matronics Kitfox-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Kitfox-List |
|
_________________
Jim Shumaker |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
