PS. Engine049

VenomGirl Wed Mar 28, 2012 3:53 am

One Question: If you believe my Venom is such a FAKE, then WHY would you ask that I pull it down and relist it with a reference to your "GENUINE Venom starting instructions for $19.99"??? Why would YOU that holds all the special authentic keys want to be connected in any way to a CLONE. FAKE, COPYCAT, LATHED PISTON, FRAUDULENT VENOM?????? Hmmmmm, now there's a question for you... again, peace, I'm over and out 049.

John Goddard Wed Mar 28, 2012 4:34 am

John Goddard wrote:Gotta sayGuys I think I agree with Kris on this one.
I never really thought people actually meant both the piston
And the cylinder were tapered.
This would be like having a cone going up and down inside a
Cone with the result that there would be compression only
Momentarily but bigger amounts of piston slap as it travelled
Down the bore (this was expensive 'rebuild' time on our RS Cosworths
Back in the day) probably interfering with any normal 'suck,push,bang,blow'
Action to draw in a charge or expel exhaust gases.

This is the point where I am going to admit to getting my gauge out this morning, then
I shall do the only appropriate thing and throw myself onto my sword......

Who'da imagined it (not me obviously) but yes the Tee Dee 051 piston IS tapered.

Good Bye
lol!

Surfer_kris Wed Mar 28, 2012 6:21 am

Guess I might have to do the same...

In which direction was it tapered?

John Goddard Wed Mar 28, 2012 6:31 am

I'm Back!

Crown narrower than skirt Kris
Very Happy

MMT Wed Mar 28, 2012 8:40 am

Boy, you people take the hobby of modeling seriously here. Makes a dumby like me feel bad about some of my post in the last few months. I thought the only thing "vemonious" about these small engines was when you got your finger whacked while tring to start one. Guess I was wrong again.

nitroairplane Wed Mar 28, 2012 8:42 am

Oh I love saying this "told ya so" Smile

But seriously guys the venom is real.

**RknRusty** Wed Mar 28, 2012 10:37 am

I think if the piston wasn't tapered inside of a tapered cylinder it wouldn't sufficiently pressurize the crankcase on the downstroke.
John, was the piston taper only near the top or was the whole skirt progressively wider from top to bottom. I think I'll be taking one of my old Tee Dees apart this evening. Between now and then, I hope to just leave my cares behind and go fly some circles.

**RknRusty** Wed Mar 28, 2012 10:43 am

MMT wrote:Boy, you people take the hobby of modeling seriously here. Makes a dumby like me feel bad about some of my post in the last few months. I thought the only thing "venomous" about these small engines was when you got your finger whacked while trying to start one. Guess I was wrong again.

I seem to have become increasingly more concerned with the details since bringing my hobby online. I do know more about "why" when my plane doesn't fly quite right, but I do get carried away. It's in my nature that I've always loved intricate details.
I have not noticed any apparent dumbness in any of your posts.

engine049 Wed Mar 28, 2012 10:51 am

nitroairplane wrote:Oh I love saying this "told ya so"
But seriously guys the venom is real.

No one has posted measurements yet lol

VenomGirl wrote:One Question: If you believe my Venom is such a FAKE, then WHY would you ask that I pull it down and relist it with a reference to your "GENUINE Venom starting instructions for $19.99"??? Why would YOU that holds all the special authentic keys want to be connected in any way to a CLONE. FAKE, COPYCAT, LATHED PISTON, FRAUDULENT VENOM?????? Hmmmmm, now there's a question for you... again, peace, I'm over and out 049.

"only registered to rattle your cage"
LOL. The members on this Forum have seen my cage rattled. That is not it Smile

" If you believe my Venom is such a FAKE"
You are misinformed I only believe there is a 65-70% I just want proof its real.

" then WHY would you ask that I pull it down and relist it with a reference to your "GENUINE Venom starting instructions for"
I want everyone to get what their stuff is worth, if it is a real venom a $17 investment is a Real good idea to buy some instructions Smile

,

Why would YOU that holds all the special authentic keys want to be connected in any way to a CLONE. FAKE, COPYCAT, LATHED PISTON, FRAUDULENT VENOM??????
At the end of the day I don't care what people do with the stuff I sell. I know I conduct the most honest business I can therefore I sleep well at night and honestly (I'm in it for the money TOO. Smile

PV Pilot Wed Mar 28, 2012 12:05 pm

well, this thread took a dirt road.

Cox International Wed Mar 28, 2012 12:28 pm

PV Pilot wrote:Put up pics of a venom driveplate,,lets see the difference.

Just curious more than anything.

Here:

http://coxengines.ca/cox-.049-drive-plate-killer-bee-silver.html

Cox International Wed Mar 28, 2012 12:30 pm

engine049 wrote:Bernie, You buy it! Ill even send you a set of genuine Venom instructions 75% off. Not re-print. Original cox $6.10 shipped. If its Genuine You'll definitely make moolah

Thanks Tom but I have NIB Venom already in my collection.

PV Pilot Wed Mar 28, 2012 12:31 pm

Cox International wrote:
PV Pilot wrote:Put up pics of a venom driveplate,,lets see the difference.

Just curious more than anything.

Here:

http://coxengines.ca/cox-.049-drive-plate-killer-bee-silver.html

Thank you Bernie.

Cox International Wed Mar 28, 2012 12:55 pm

I had a look at the Venom piston drawing and, as far as I can tell, the Venom piston is not tapered, only the cylinder. However, the piston is thin-walled, therefore making it lighter. There is a reference to "max. taper allowed .0001" but again, you would not be able to measure that and I don't believe that meant the piston is designed with a taper.

Decades ago Cox experimented with a "real" tapered piston but it would be almost impossible for any of you to measure the taper. Most electronic calipers resolve only to 5/10,000" and the taper was 45/100,000" +/- 15/1,000,000".

PV Pilot Wed Mar 28, 2012 1:33 pm

It seems a tapered piston and cylinder would be really tight at TDC, then extremely loose at BDC, especially the skirt area.

When the crank throw would flip over to the beginning of the upstroke at bdc it would rattle the heck out of the skirt.

Cox International Wed Mar 28, 2012 1:47 pm

What Cox did was a douple taper at the tip of the piston, meaning a portion at the top had a bigger OD. There was no conical taper. See it more along the lines of a piston ring.

Surfer_kris Wed Mar 28, 2012 4:06 pm

I've now gone though a couple of engines in my stash, and I don't have any .049 engines with a tapered piston, only tapered cylinders (the #4 ones). I don't have any Venom though, so I cannot comment on that.

The TD .051 however does actually seem to have a tapered piston with a larger bottom end compared to the crown. Never heard or seen any other engine makers do that, usually there is a relief at the lower end of the piston, if it runs in a parallel bore, or the piston is parallel while running in a tapered bore.

nitroairplane Wed Mar 28, 2012 4:14 pm

Surfer_kris wrote:I've now gone though a couple of engines in my stash, and I don't have any .049 engines with a tapered piston, only tapered cylinders (the #4 ones). I don't have any Venom though, so I cannot comment on that.

The TD .051 however does actually seem to have a tapered piston with a larger bottom end compared to the crown. Never heard or seen any other engine makers do that, usually there is a relief at the lower end of the piston, if it runs in a parallel bore, or the piston is parallel while running in a tapered bore.

Do you have a space bug to check?
GermanBeez said that the piston on his space bug was tapered and other .049 pistons would not fit the cylinder.

Godsey3.0 Wed Mar 28, 2012 4:19 pm

I have the newer Space Bug Jr. And it is not tapered. Not sure about the older ones.

Cox International Wed Mar 28, 2012 4:50 pm

Surfer_kris wrote:I've now gone though a couple of engines in my stash, and I don't have any .049 engines with a tapered piston, only tapered cylinders (the #4 ones). I don't have any Venom though, so I cannot comment on that.

The TD .051 however does actually seem to have a tapered piston with a larger bottom end compared to the crown. Never heard or seen any other engine makers do that, usually there is a relief at the lower end of the piston, if it runs in a parallel bore, or the piston is parallel while running in a tapered bore.

Any tapered pistons would have a bigger OD at the top and not the bottom.

To my knowledge Cox only made them once for the TD 049. But again, I seriously doubt that anyone from this forum can measure this. I have tapered cylinders here and my $250 calipers which resolve to .0005" can't measure this.

Surfer_kris Wed Mar 28, 2012 5:36 pm

I simply tested how far I can push the pistons out through the top of the cylinder...

On tapered .049 cylinders I can push the piston all the way through, but on the .051 they will not go through all the way, indicating a larger bottom end on the piston compared to the top of it.

I don't have any space bug engines and might not have old enough TD .049 engines either, if this was changed from the very early ones...

Cox International Wed Mar 28, 2012 5:50 pm

"Hand feel" is the way to go when testing if a cylinder is tapered. However, it is strange that a piston would be bigger at the bottom. I am pretty sure that your engine does not have a (intentionally manufactured) tapered piston.

What I think is happening is that the cylinder is tapered and the piston is not. However, Cox specs were .0001 OD tolerance over the length of the piston and it happens to be that the + .0001 is at the bottom of the piston and the - .00040 at the top of the cylinder. When those extremes meet, they bind.

Surfer_kris Thu Mar 29, 2012 12:41 am

Okey, lets pull John off his sword then...

VenomGirl Thu Mar 29, 2012 3:24 am

Re: Venom!!!!!
nitroairplane Yesterday at 8:42 am

Oh I love saying this "told ya so"
But seriously guys the venom is real.

_________________
"Oh Canada"

GOTTA LOVE CANADIANS! THEY TELL IT LIKE THEY SEE IT!!!!! Thank You.

mitchg95 Thu Mar 29, 2012 3:40 am

[quote="VenomGirl"]Re: Venom!!!!!
nitroairplane Yesterday at 8:42 am

Oh I love saying this "told ya so"
But seriously guys the venom is real.

i gotta agree with venomgirl here
according to mh-aerotools, it was made for one year

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