Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Cox Engine of The Month
November-2017
MauricioB's

"Cox Tee Dee .010"



PAST WINNERS
Speed Contest 2018
CEF Traveling Engine

Gallery


Win This Engine!
The Traveling Prop
World of Aviation

Cox .09 glow plug ?

View previous topic View next topic Go down

Cox .09 glow plug ?

Post  oldguy on Tue Feb 23, 2016 2:47 pm

Is this a better way to go with glow plugs for the .09 medallion? Or just use the standard cox plug?I need a plug for my .09 medallion.
http://www.ebay.com/itm/GLOW-PLUG-ADAPTOR-COX-09-engine-use-standard-long-plug-MADE-in-USA-911-009-/281012094238?hash=item416da0451e:g:0B8AAOxyV85R0PIY
Jim
avatar
oldguy
Gold Member
Gold Member

Posts : 105
Join date : 2015-12-10
Age : 63
Location : arizona

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  Cribbs74 on Tue Feb 23, 2016 4:28 pm

Jim,

If you plan on doing a lot of flying it's not a bad idea. .09 heads are a little harder to find than .049's so it would pay off in the long run. It also allows you to use a standard ignitor.

You will loose a bit of compression over the standard head, but you could always sand down the head a little to build it back up of needed.

Ron
avatar
Cribbs74
Moderator

Trusted Seller
Posts : 9521
Join date : 2011-10-24
Age : 43
Location : Tuttle, OK

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  JPvelo on Wed Feb 24, 2016 6:15 am

I like this option, the Nelson plugs last forever and there is no loss of compression.

http://www.flyfreeflight.com/Site/Modified_Glow_Heads.html
avatar
JPvelo
Diamond Member
Diamond Member

Posts : 1925
Join date : 2011-12-02
Age : 50
Location : Phoenix

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  oldguy on Wed Feb 24, 2016 11:43 am

JPvelo wrote:I like this option, the Nelson plugs last forever and there is no loss of compression.

http://www.flyfreeflight.com/Site/Modified_Glow_Heads.html

So basicly drill and tap and original bad plug.What thread is used on the small standard plug?
avatar
oldguy
Gold Member
Gold Member

Posts : 105
Join date : 2015-12-10
Age : 63
Location : arizona

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  fredvon4 on Wed Feb 24, 2016 12:37 pm

Need a good way to hold the glow head

A Used cylinder works in a v grove section of a vise

First punch out he glow filament and center post from the inside out the top of the glow head

Next from the outside top you use a 7/32 drill and there are arguments about all the way through or just enough deep for the standard glow plug with one or more copper gaskets to fit...this method requires a BOTTOMING 1/4-32 tap

Drilling all the way through with the 7/32 lets you use any 1/4-32 tap

even though this is soft aluminum you need to go slow taping with light oil and frequent cleaning of the flutes by backing out 1/4 turn before then next turn in cutting

If the is just a sport .09 this is a cheap method but like others have said...the adapters that are out there are set for TURBO plugs or Nelson plugs and either is a good investment as they add RPM and in the case of the Nelson plugs the plug is relatively cheap at $5 most sources

Look up Nelson plugs and you should see why they seal the chamber better

Car guys use TURBO plugs...same idea but different method and shapes and the plugs are outrageously priced...IMO
avatar
fredvon4
Diamond Member
Diamond Member

Trusted Seller
Posts : 2211
Join date : 2011-08-26
Age : 62
Location : Lampasas Texas

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  oldguy on Wed Feb 24, 2016 3:26 pm

fredvon4 wrote:Need a good way to hold the glow head

A Used cylinder works in a v grove section of a vise

First punch out he glow filament and center post from the inside out the top of the glow head

Next from the outside top you use a 7/32 drill and there are arguments about all the way through or just enough deep for the standard glow plug with one or more copper gaskets to fit...this method requires a BOTTOMING 1/4-32 tap

Drilling all the way through with the 7/32 lets you use any 1/4-32 tap

even though this is soft aluminum you need to go slow taping with light oil and frequent cleaning of the flutes by backing out 1/4 turn  before then next turn in cutting

If the is just a sport .09 this is a cheap method but like others have said...the adapters that are out there are set for TURBO plugs or Nelson plugs and either is a good investment as they add RPM and in the case of the Nelson plugs the plug is relatively cheap at $5 most sources

Look up Nelson plugs and you should see why they seal the chamber better

thanks fred.

Car guys use TURBO plugs...same idea but different method and shapes and the plugs are outrageously priced...IMO
avatar
oldguy
Gold Member
Gold Member

Posts : 105
Join date : 2015-12-10
Age : 63
Location : arizona

View user profile

Back to top Go down

Re: Cox .09 glow plug ?

Post  Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum