Re: Introducing the new Cox International "Xtreme" engine

Cox International Tue Jun 05, 2012 1:28 pm

Thanks Kim and #13 is on the way to you Smile

Kim Wed Jun 06, 2012 8:42 am

Cox International wrote:Thanks Kim and #13 is on the way to you

WONGOOOO! Score Lucky 13 for the Skunk Works !!!!!!!!!!!!!!!!!!!!!!!!!!!

Kim Mon Jun 11, 2012 2:06 pm

[quote="Kim"]

Cox International wrote:Thanks Kim and #13 is on the way to you

"And as he said it, so it was" !!!! Thanks Bernie !!!

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nitroairplane Mon Jun 11, 2012 2:11 pm

[quote="Kim"]

Kim wrote:
Cox International wrote:Thanks Kim and #13 is on the way to you

"And as he said it, so it was" !!!! Thanks Bernie !!!

And Bernie said "let there Be Cox" and there was cox!

microflitedude Mon Jun 11, 2012 2:17 pm

Now the question of... Will you run it? Very Happy

Kim Mon Jun 11, 2012 2:21 pm

microflitedude wrote:Now the question of... Will you run it?

DUDE !!!!!!!!!! What do YOU think ????!!!!!!

microflitedude Mon Jun 11, 2012 2:25 pm

Kim wrote:
microflitedude wrote:Now the question of... Will you run it?

DUDE !!!!!!!!!! What do YOU think ????!!!!!!

I'm thinking yes. Smile

Kim Mon Jun 11, 2012 2:33 pm

microflitedude wrote:
Kim wrote:
microflitedude wrote:Now the question of... Will you run it?

DUDE !!!!!!!!!! What do YOU think ????!!!!!!

I'm thinking yes.

Well, OK then !!!

The only reason it's not getting it's break-in right now is that I got to go get an "Old-Guy" check-up about my sissy shoulder!

They tolerated my disassembly of engines in the waiting room last month, but I somehow figure that a screaming RACING ENGINE just MIGHT be pushing it a bit too far...

Also, you should be getting your 5-40 hardware today or tomorrow!

Jason_WI Mon Jun 11, 2012 5:32 pm

I didn't get mine yet Sad

Dang customs......

Jason_WI Mon Jun 11, 2012 6:13 pm

Jason_WI wrote:I didn't get mine yet

Dang customs......

Ok I spoke too soon.

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Kim Tue Jun 12, 2012 7:54 pm

Three tanks of fuel (25% Sig) for break-in with a Cox 5-3 Gray, then I let'r rip! Good needle valve response/settling. Haven't experimented with the head shims yet.

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Cox International Tue Jun 12, 2012 8:20 pm

Can you run it with only 2 shims and a Cox 5x3 black prop - just for the fun of it?

Kim Tue Jun 12, 2012 8:24 pm

Cox International wrote:Can you run it with only 2 shims and a Cox 5x3 black prop - just for the fun of it?

Will Do...

Jason_WI Tue Jun 12, 2012 8:43 pm

Its possible that it is still over compressed with just 3 head shims. Maybe got to 5 and see what it does.

Jason

Kim Tue Jun 12, 2012 8:59 pm

Kim wrote:
Cox International wrote:Can you run it with only 2 shims and a Cox 5x3 black prop - just for the fun of it?

Will Do...

Hey Bernie...I'm thinking it may still need some run time. It went up over 18 then surged a bit back and forth. I was losing my light, and so used a flashlight to run the tach, which tended to register all over the place. I'll try it again in daylight tomorrow!

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Introducing the new Cox International "Xtreme" engine - Page 2 6_35

Kim Wed Jun 13, 2012 4:03 am

Jason_WI wrote:Its possible that it is still over compressed with just 3 head shims. Maybe got to 5 and see what it does.

Jason

Will do Jason ! Missed your post last night as I was running in and out of the house. Gonna do it this afternoon with 5 shims and back to two also.

Kim Wed Jun 13, 2012 5:23 pm

OK...HERE we go!

I packed 5 head gaskets into Ole #13, which brought it's average RPM to a pretty steady 17000. I then ran a couple tanks each as I progressively removed gaskets until I got it down to one.

With one gasket, on 25% Sig, it surge back and forth across 19000. I also thought to balance the 5-3 prop...it was a bit out...and this may have helped also.

As usual, I'm pressed for time with other things, and will have to get back to it to see if more run time helps. May also squirt some 35% in the wild dog to see what happens.

Methinks I'm fixing to void my warranty!!!!!!

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Introducing the new Cox International "Xtreme" engine - Page 2 1_138

fit90 Wed Jun 13, 2012 5:49 pm

Kim,

Why not try taking an APC 5.7 X 3 and cutting it down to 5". I bet that little engine picks up at least 1500 RPM. The fast turners don't like that wide heavy prop.

No matter what RPM it makes it looks fast doing it.

Bob

Kim Thu Jun 14, 2012 4:07 am

fit90 wrote:Kim,

Why not try taking an APC 5.7 X 3 and cutting it down to 5". I bet that little engine picks up at least 1500 RPM. The fast turners don't like that wide heavy prop.

No matter what RPM it makes it looks fast doing it.

Bob

I'll see if I've got one in my inventory (I keep the APC's locked in a cage to prevent them from bullying the other props), and give it a shot. I think the Cox 5-3's DO give an across-the-board RPM comparison of these little engines though.

I'm going to start another thread though, sorry I got carried away and hijacked Bernie's post....