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Cox Engine of The Month
June-2021
balogh's

"Little Red Rooster"




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Post  Scotland421 Sat Jun 05, 2021 8:55 pm

Anybody see a difference besides me?Difference? 20210610
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Post  Cribbs74 Sat Jun 05, 2021 10:41 pm

Wall thickness maybe, but hard to tell from the picture.
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Post  Coxfledgling Sun Jun 06, 2021 2:53 am

Ummmm, one is red?

The black one has no pressure stub and is shaped around Venturi inner area, what size engine ?

Any ones if these plastic ones for td09's yet anywhere ?
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Post  coxaddict Sun Jun 06, 2021 3:09 am

The red aluminum mount has no inner shoulder that keys it to the crankcase. It has to be tightened tightly to prevent it from moving Cool
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Post  Scotland421 Sun Jun 06, 2021 7:08 am

@coxaddict wrote:The red aluminum mount has no inner shoulder that keys it to the crankcase. It has to be tightened tightly to prevent it from moving Cool

Exactly. but wi a new engine and tightening the collar enough tae keep the venturi body frae spinning, the crank case distorts and the engine produces black oil. I checked all the parts on a surface plate and a vernier height guage and all dimensions are perfect. Needs an indexing shoulder, otherwise the product is useless...I had one flight on a GLH and the venturi body collar spun out and the engine locked up solid. Cox always warned against torquing engine parts too tight as the tolerances were in the millionths of an inch and the danger of distortion.
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Post  getback Sun Jun 06, 2021 7:59 am

If i am not mistaken , there is a O-ring that works with the red alum. body . This will keep it from rotating , want it ? I have seen them in kits before i have one somewhere ! From CI it says > For best fit use a bit of silicone or equivalent when installing< It's a thin metric O-ring Sad
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Post  Scotland421 Sun Jun 06, 2021 8:01 am

I threw it in the bin, useless rubbish. The delrin one is superior.
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Post  getback Sun Jun 06, 2021 8:06 am

I want disagree with you on that , i am Not a fan of them. Very Happy
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Post  Levent Suberk Sun Jun 06, 2021 8:41 am

@Scotland421 wrote:
@coxaddict wrote:The red aluminum mount has no inner shoulder that keys it to the crankcase. It has to be tightened tightly to prevent it from moving Cool

Exactly. but wi a new engine and tightening the collar enough tae keep the venturi body frae spinning, the crank case distorts and the engine produces black oil. I checked all the parts on a surface plate and a vernier height guage and all dimensions are perfect. Needs an indexing shoulder, otherwise the product is useless...I had one flight on a GLH and the venturi body collar spun out and the engine locked up solid. Cox always warned against torquing engine parts too tight as the tolerances were in the millionths of an inch and the danger of distortion.

Why tightening collar distort crank case? Is it possible?
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Post  Scotland421 Sun Jun 06, 2021 8:44 am

@Levent Suberk wrote:
@Scotland421 wrote:
@coxaddict wrote:The red aluminum mount has no inner shoulder that keys it to the crankcase. It has to be tightened tightly to prevent it from moving Cool

Exactly. but wi a new engine and tightening the collar enough tae keep the venturi body frae spinning, the crank case distorts and the engine produces black oil. I checked all the parts on a surface plate and a vernier height guage and all dimensions are perfect. Needs an indexing shoulder, otherwise the product is useless...I had one flight on a GLH and the venturi body collar spun out and the engine locked up solid. Cox always warned against torquing engine parts too tight as the tolerances were in the millionths of an inch and the danger of distortion.

Why tightening collar distort crank case? Is it possible?
With fits and tolerances in the microns...aye. Mine produced clear oily exhaust wi the Delrin one. Black oily exhaust wi the aluminum one
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Post  Levent Suberk Sun Jun 06, 2021 8:50 am

I didn't use aluminum carb body but it seems impossible to me, because collar and carb body are against crank case front. I think that it is impossible to distort crankcase when you apply force against crankcase front, but crankcase sides. Perhaps I think wrong, don't know too much about it. Very Happy
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Post  Scotland421 Sun Jun 06, 2021 9:16 am

Just think of it this way...black oil emission is aluminum wear.
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Post  davidll1984 Sun Jun 06, 2021 9:16 am

love use this parts look Good But much more in fact this piece increases the internal volume of the crank chaft induction portion is changed certain rule must be followed firstly use celicone it is not enough use gasket maker like that gray moto seal from permatex wil hold very solid Don't over tighten
Make sure that the part is sealed no leak work Good A little difficult to install of course on the original does not need gasket But more fragile Babe Bee .049 Small Cox Logo
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Post  1Bad67 Sun Jun 06, 2021 9:23 am

It seems that both styles, Aluminum and Plastic, have their problems. Plastic can split, Aluminum has trouble sealing. Seems like you choose which you want to deal with.
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Post  gkamysz Sun Jun 06, 2021 11:08 am

Regarding tolerances, that only applies to the piston to cylinder fit. The rest of the engine is very normal in fits and tolerance. It should be expected that the crankcase bends when the nose collar is tightened due to the cutout in the case. How much bend (torque on the collar) is acceptable will depend on how tight the crank fits the case.
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Post  Scotland421 Sun Jun 06, 2021 11:14 am

This Tee Dee is older, excellent machining. The crank journal is intimate. Wi the delrin intake body, the engine dinnae leak oil outae the front of the journal hardly. Wi the Aluminum one, the crank journal leaks black oil like a seive. The delrin one seals nicely wi little torque on the retaining collar. I have many delrin ones. I thought the aluminum one would be a nice bling but alas, i threw it out. I have one on a TD 051 as well that I wi be removing.
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Post  Scotland421 Sun Jun 06, 2021 12:53 pm

Seems like this forum has censoring like face book and twitter. Sad
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Post  Levent Suberk Sun Jun 06, 2021 12:59 pm

@Scotland421 wrote:Seems like this forum has censoring like face book and twitter. Sad

Censored what? Huh...
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Post  Scotland421 Sun Jun 06, 2021 1:11 pm

Someone posted the Ebay store owner should communicate with me. I wrote He blocked me and is snubbing my reply, failure tae communicate...Comment deleted.
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Post  Levent Suberk Sun Jun 06, 2021 1:18 pm

Admin can clear that situation.
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Post  Scotland421 Sun Jun 06, 2021 1:25 pm

Nae worth the trouble. Very Happy
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Post  Cribbs74 Sun Jun 06, 2021 4:25 pm

Only Admin and I have the ability to delete anything. I didn’t delete anything and I doubt he did either. There is an automatic forum censor however it will only censor certain curse words. Everything else would be left as you wrote it.

I have used the aluminum carb bodies and have had zero issues with them whatsoever. Perhaps you received one that wasn’t made correctly.

Why the seller banned you I have no idea.


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Post  Scotland421 Sun Jun 06, 2021 4:53 pm

I wouldnae use hate words here, wee children might see it. 't is a forum fae fellowship merryment and tinkering. Very Happy
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Post  Admin Sun Jun 06, 2021 5:02 pm

I didn't delete anything.

Sometimes if you wait too long while typing up a post, the server can time out and your post doesn't go through. Should give an error message but it's easy to miss.

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Post  Scotland421 Sun Jun 06, 2021 6:06 pm

That is what it was....I'm auld and computeringly challenged. LOL
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