Cox Texaco Production Blog

Nope, but coxinternational has a 5 fin conversion glow head, that looks just like it.
i think thats a better alternative, seeing hat jacob has never run his with the oem glow head.

I've just recieved the tank and crank case from matt today
(my thanks go to matt, who found these two rather rare parts in matt's shop for me,
and showing my royal stupidity how to click the "insert image button"


here are the assembled parts. sort of.

Yeah, the head Bernie has is pretty close with the insert. I have found that the RPM difference is only a few hundred.

Matt

I'm not sure if the compression will be the same as the OEM head. I'm sure it will have the same cooling properties. I just don't run mine with a OEM head since (I thought) I only had one. When I was digging in my parts cabinet I did find a NIP 5 fin glow head in the bottom (as well as those cloned td heads). I'll keep my eyes open for some spare 5 fin heads, plus I'll think about hooking you up the one I have.

looking good so far!

Yep, matt did really nice work in cleaning the parts! (sorry that the pics are so big)
btw, there probably won't be any updates about the engine for a while, because of my
trip to the US (Golden Bee,YAY!!)

Looks like a good start!

Yes, I forgot about the compression difference. Obviously there is no perfect substitute for an OEM head.

To have them made you would be looking at a retail around $12 to $15.

Matt

does the oem head have higher compression?

Yes, in my experience at least.

Matt

Nice engine and when your finished please let's see a video.

don't worry, i sure will make one

whew, i've finally found the right priming mixture and the right carb setting for the engine to start.
but if you spray in just a little too much fuel, it won't start and flood the engine after flipping the prop.
she's still a very picky little girl...

ok guys, i'm back!
i've been sleeping for 12 hours and i thought it would be a good idea to get up...
i'll see if i'll order the TX parts today, so bear with me...

I was talking to some SAM guys the other week and they said you dont need the 5 fin head. The 5 fin head is the same as the standard head compression wise. The only difference is the two extra fins which dont do much in the way of cooling. (so they say) The guy I was talking to swings a 10x4 wood prop on his standard BabeBee 049 texaco engine.

I haven't tried the new "insert" style ones Bernie is selling yet... maybe he'll send me some with my next order... but they look like they would be high compression heads to me from the photos.

i do want to try bernie's, just because of the looks. the 5 fin head is what gave the texaco its character. otherwise, it
would just look like a black widow fitted with a red tank and back vents.

warrenlead wrote:I was talking to some SAM guys the other week and they said you dont need the 5 fin head. The 5 fin head is the same as the standard head compression wise. The only difference is the two extra fins which dont do much in the way of cooling. (so they say) The guy I was talking to swings a 10x4 wood prop on his standard BabeBee 049 texaco engine.

I haven't tried the new "insert" style ones Bernie is selling yet... maybe he'll send me some with my next order... but they look like they would be high compression heads to me from the photos.

i have a pee wee .020 engine that swings a 7 by 5 apc prop and will last over 5 mins on a 2 cc tank.

news from the sector!
i finally got around to buying the rest of the parts from bernie (sry matt ),
so there will be pictures soon, oh yes...

GermanBeez wrote:news from the sector!
i finally got around to buying the rest of the parts from bernie (sry matt ),
so there will be pictures soon, oh yes...

What prop do you think you'll run?

I just saw this thread.

Our 5-fin adapter does provide extra cooling, same as the OEM Texaco head. The added advantage of our head is that you can either use the "medium-hot" insert or a "hot" insert. The "hot version is the optimal one for low-RPM applications (we also use that one in our throttle conversions).

Another advantage is that replacement inserts only cost $4.95.

As to compression, the opposite of what has been stated is actually correct. Our biggest problem with that head is that it often over-compresses the engine and the engine sputters but will not run, especially if the engine has above average compression to begin with. This happens more often with the "hot" than the "medium hot" insert due to the filament housing volume.

Many a customer we have advised to use 3 to 4 glow head gaskets; after which they invariably reported back that their engine now runs. The trick is then to experiment by removing one glow head gasket at a time until optimum running is achieved.

My own tests have shown the insert style head to actually increase RPM over the Cox OEM head on reed-valve engines. However, for Texaco style events, the idea is longevity of engine run-time. The correct combination would be 5-fin clamp ring with the "hot" insert.

We have a customer that, to the surprise of his competitors, continually achieves far longer run times at Texaco events using that combination as opposed to the stock Cox head.

Bernie
www.coxinternational.ca

Thanks for the tip Bernie, that'll save me a lot of hassle when i try to run it.
Like i mentioned earlier(i think), i want to replicate the Texaco's performance as close as possible,
so i hope the back plate (12$- wow...) will be worth it!
@nitro
hm. dunno.
probably the usual 6x4. i don't think i'll buy a 7" prop solely for this engine.

GermanBeez wrote:Thanks for the tip Bernie, that'll save me a lot of hassle when i try to run it.
Like i mentioned earlier(i think), i want to replicate the Texaco's performance as close as possible,
so i hope the back plate (12$- wow...) will be worth it!
@nitro
hm. dunno.
probably the usual 6x4. i don't think i'll buy a 7" prop solely for this engine.

No I think you should go larger maybe an 8*4 at least ive run 10" and 7*5 on a pee wee .020 tank lasted over 7 mins.

The OEM Cox Texaco prop is this one:

http://coxengines.ca/product.php?productid=82&cat=9&page=2

This prop has the bigger shaft-hole.

However, the Texaco engine will run well with props down to size 4.5 X 4. It just depends what you are trying to achieve. If it's competing in Texaco events then 8 x 4 it is. With correct backplate (grey with smaller venturi hole), proper needle setting, low nitro fuel and the "hot" insert you should end up aprx. 5,000 RPM and 15-20 minute run times.

Bernie

Cox International wrote:The OEM Cox Texaco prop is this one:

http://coxengines.ca/product.php?productid=82&cat=9&page=2

This prop has the bigger shaft-hole.

However, the Texaco engine will run well with props down to size 4.5 X 4. It just depends what you are trying to achieve. If it's competing in Texaco events then 8 x 4 it is. With correct backplate (grey with smaller venturi hole), proper needle setting, low nitro fuel and the "hot" insert you should end up aprx. 5,000 RPM and 15-20 minute run times.

Bernie

15 to 20 mins that's great I really think I should try that.