By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Oct 22nd

Which ignition system for 1/4 x 32 spark plug

All Topics | Latest Posts

Search for:  in Thread Title in  
Richard Cox29/08/2019 12:31:13
38 forum posts
11 photos

Hi what ignition system of the rcexl style would you recommend as I can only find ones suitable for the bigger plugs it’s for a Nemett Lynx 15cc

Rich

pgk pgk29/08/2019 12:44:23
1455 forum posts
282 photos

Any help:

hobbyking

JasonB29/08/2019 13:00:38
avatar
Moderator
16288 forum posts
1723 photos
1 articles

I went with the one from S/S in the states, have used them quite a bit on the hit and miss engines too, they do a nice neat plug boot for the small 1/4 x 32 plugs and small diameter silicon insulated wire not that ugly braided stuff.

You could also look at Minimag's offerings like the MCL1 which would work OK

A lot of of the Rcexl systems have auto advance that does not work well on these engines.

Roger B29/08/2019 14:28:25
avatar
71 forum posts
29 photos

The RCexl systems will work but the sensor needs to be on the crankshaft, not on the camshaft, as these are designed for 2 stoke engines. The wasted spark on the other TDC is not a problem as there is no combusible mixture.

They start with full advance, 28°, which drops to 4° at around 400rpm and then starts rising at 1000rpm reaching full advance again at 4000rpm. This should be ok for a Lynx but is not suitable for low speed hit and miss type engines.

1/4-32 versions are available from Just Engines and I assume other suppliers.

**LINK**

Best regards

Roger

Richard Cox29/08/2019 19:50:13
38 forum posts
11 photos

Jason the cap and wire is ugly on the rcexl and out of proportion I will have a look into the ss type thanks

Rich

Richard Cox29/08/2019 19:51:24
38 forum posts
11 photos

Thanks roger relating to the sensor issue I did think of adding two magnets 180 degrees opposed on a disc on the cam and run it as a wasted spark potentially

Rich

Roger B30/08/2019 07:31:47
avatar
71 forum posts
29 photos

The RCexl screened cable and plug cap are probably necessary if you are flying the engine in an RC aircraft but as you say otherwise somewhat bulky.

Best regards

Roger

JasonB30/08/2019 07:36:37
avatar
Moderator
16288 forum posts
1723 photos
1 articles

They use the screen and outer metal casing of the cap as the ground, S/S and Minimag have a separate small wire

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Meridenne Boat 2019
Eccentric July 5 2018
Ausee.com.au
TRANSWAVE Converters
ChesterUK
Eccentric Engineering
Warco
cowbells
emcomachinetools
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest