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Tapered grind cylinder texaco ??
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Tapered grind cylinder texaco ??
Ok y was working on engine and try new texaco cylinder piston piston Not tapered cylinder is look the very last piston on picturs piston was used very very short and look strange To me after inspection try variable wit difrent cylinder piston model piston is very old and from tapered cylinder and lock on top of cylinder ?? Wont past tdc its new piston is Not taper piston
davidll1984- Diamond Member
- Posts : 2318
Join date : 2020-02-12
Age : 39
Location : shawinigan
davidll1984- Diamond Member
- Posts : 2318
Join date : 2020-02-12
Age : 39
Location : shawinigan
davidll1984- Diamond Member
- Posts : 2318
Join date : 2020-02-12
Age : 39
Location : shawinigan
Re: Tapered grind cylinder texaco ??
David, the way that piston is worn halfway down its skirt tells me that it may come from a regular non-taper design engine, and the cylinder you put it into may be a taper grind design.
The 2 will combine into a tight fit combo, but the non-taper piston may wear the taper cylinder faster, and ultimately the taper bore of the cylinder wears out into a non-taper geometry. I went through that in my history of COX engines, unfortunately.
The 2 will combine into a tight fit combo, but the non-taper piston may wear the taper cylinder faster, and ultimately the taper bore of the cylinder wears out into a non-taper geometry. I went through that in my history of COX engines, unfortunately.
balogh- Top Poster
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Re: Tapered grind cylinder texaco ??
How can you identify a tapered piston? I never knew about tapered pistons or cylinders when I disassembled dozens of product and Babe Bee engines and just bunching all the parts together. Do all thin walled cylinders have a tapered bore? Is that why some early number 2 cylinders perform well? I only knew of tapered bores in T.D. engines. The T.D. .049 engines I purchased in the early eighties had tapered bores according to the instruction sheets. Don't know the actual manufacturing dates of those engines although they did come in the crystal cases.
coxaddict- Gold Member
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Location : north shore oahu, Hawaii
Re: Tapered grind cylinder texaco ??
The cylinder identification table helps find engines with tapered bore.
https://www.coxengineforum.com/h23-cylinder-identification
In fact the way I see, apart from the early TeeDee 049...051 engines made roughly before 1974 (my TeeDee-s made before 1974 or so have, but later TeeDees do not have tapered grind) , the Killer Bee-s made between 1992 and 2002 also came with tapered bore. Given that Killer Bee-s also had slit exhaust cylinders, it may well be that David has a Killer Bee tapered bore slit exhaust cylinder, that he combines with a regular piston.
Whether a piston comes from a tapered grind cylinder is not easy to find out unless you have very fine gauges to measure the taper between piston top and bottom.. I would expect that normal, parallel contoured pistons will stick in the tapered bore cylinder and display wear marks seen on the piston David shows in his post, i.e. excessively worn half way down the skirt.
https://www.coxengineforum.com/h23-cylinder-identification
In fact the way I see, apart from the early TeeDee 049...051 engines made roughly before 1974 (my TeeDee-s made before 1974 or so have, but later TeeDees do not have tapered grind) , the Killer Bee-s made between 1992 and 2002 also came with tapered bore. Given that Killer Bee-s also had slit exhaust cylinders, it may well be that David has a Killer Bee tapered bore slit exhaust cylinder, that he combines with a regular piston.
Whether a piston comes from a tapered grind cylinder is not easy to find out unless you have very fine gauges to measure the taper between piston top and bottom.. I would expect that normal, parallel contoured pistons will stick in the tapered bore cylinder and display wear marks seen on the piston David shows in his post, i.e. excessively worn half way down the skirt.
balogh- Top Poster
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Re: Tapered grind cylinder texaco ??
I never thought that the pistons were tapered on any of the years. The way the piston skirt is worn tells me that material needs to be removed from the skirt, and maybe a bit of lapping just above the exhaust port to maybe half way up the non tapered cylinder. Maybe reverse the piston in the bore to lap it, but do not go all the way to the top of the cylinder. Carefully of course. That way you pretty much have a tapered cylinder. You could do the lapping with a scrap piston too, but that way could fix both the P/C. Also alternatively you could take some 600 sandpaper and remove some material from just the bottom of the skirt. If the P/C fit is already loose then, well, sorry.
aspeed- Platinum Member
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Re: Tapered grind cylinder texaco ??
Wel m'y trouble is the piston cylinder new from cox buy couple monts from now after short run Find its old stock cylinder y tink wit new production piston correct me if wrong médalion .049 last production use that cylinder To ? Just want To build right type engines To Which it belongs y wanted To build texaco engines wit. ... m'y cylinder is tapered two bypas one boost on each no spi To very litle wit difrent casing ?? Tink y need new médalion piston right ???for right spec
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Y want To build texaco engines for m'y modified ez bee fly in the Snow without silencer in Québec weather condition temp get very cold wit open exaust port engine wont run unles use silencer To keap heat inside cylinder y want Good performance slited exaust wit just litle deflector works very Good powerful below _15°silencer is best wit like _20°c temp tink texaco engines suit best for this particular condition and run tapered cylinder wit non tapered piston in cold parts react piston heat faster inside and cylinder stay cold litle result tight piston wile runing wear faster tink ?? Y fly m'y tigermoth in Snow storm lot of fun
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Others would know more than me, but I thought all the pistons were virtually the same, except for the very early ones with the oil hole. The fit could vary.
aspeed- Platinum Member
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Re: Tapered grind cylinder texaco ??
DavidII1984,
I think running your engines in the cold weather is the problem, not the manufacturing of the part. In those cold conditions you would need to break in the new parts you installed. Make sure the engine comes up to operating temperature during break in and not too cold or too hot. Once the engine can run at a good rpm without sagging I would call it good. You could fill in the cooling fins with cord or copper wire to retain the heat. Cox engines normally run cold anyway. Some high compression heads come with less fins to keep operating temperatures up. The Texaco style 5 fin glow heads are used when running larger propellers, not good for cold weather. The Glo Bee head clamps had no fins, and engines using them ran fine. Running your models in the snow sure must be fun!
I think running your engines in the cold weather is the problem, not the manufacturing of the part. In those cold conditions you would need to break in the new parts you installed. Make sure the engine comes up to operating temperature during break in and not too cold or too hot. Once the engine can run at a good rpm without sagging I would call it good. You could fill in the cooling fins with cord or copper wire to retain the heat. Cox engines normally run cold anyway. Some high compression heads come with less fins to keep operating temperatures up. The Texaco style 5 fin glow heads are used when running larger propellers, not good for cold weather. The Glo Bee head clamps had no fins, and engines using them ran fine. Running your models in the snow sure must be fun!
coxaddict- Gold Member
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Re: Tapered grind cylinder texaco ??
Yes coxaddict tink glo bee type wil be Perfect for that wil try To Find one wil use hi compression from the killer bee y tink y figure wat cylinder is same as the killer bee just Not cut modification To exaust it wil fit m'y need tink y have To break in inside To cold outside now just To late for him wil use difrent cylinder piston tink Not sure y try couple engines now outside try Find one Good runer for cold conditions
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
After Good search in the sceptre flight link hard To Find texaco test y Find it its found wit cox tee dee .09 rc.051rc
test look
Test found texaco engines duration inconsistent result of trouble wit production new matériel used change of ventury size y want more info on différence wit difrent ventury and back plate change rpm duration
test look
Test found texaco engines duration inconsistent result of trouble wit production new matériel used change of ventury size y want more info on différence wit difrent ventury and back plate change rpm duration
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Finally Find Good performance engine combo using over size ventury on texaco tank now wit spec of black widow old cylinder tapered wit two bypas no boost no spi now wit tuned pipe instal befor modification engines run 16000 max wil try and se différence y try wit new red mufler big drop rpm wit spi in hope To get same rpm now wit m'y modified tune pipe or gain in rpm y did change its exit for smaler size now same size of the collector look
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Test wit just exaust collector 10 000 rpm wit tuned pipe 11 500 y have To make change To its compression tink tune pipe work just Not Good cylinder for it ??
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Couple modification change ventury now same size of back plate Bolt exaust collector modification over size wit difrent back plate now texaco or black widow plastiques one ventury jet size larger than the one y used last test was runing bether like 13 000 rpm consistent Not tested my engine after new modification is now instaled on m'y ez bee
Tink is redy for run now
Tink is redy for run now
Last edited by davidll1984 on Thu Nov 19, 2020 10:37 pm; edited 1 time in total
davidll1984- Diamond Member
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Re: Tapered grind cylinder texaco ??
Looks great, David..
balogh- Top Poster
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Re: Tapered grind cylinder texaco ??
Thank you is a spécial plane To me long time y have Not run m'y old ez bee crack in firewal and Bolt fixing the two part Front fuselage now fix
davidll1984- Diamond Member
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New part for the crazy bee rc plane engine
Last edited by davidll1984 on Mon Nov 30, 2020 11:23 am; edited 1 time in total (Reason for editing : Corection)
davidll1984- Diamond Member
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