RE: Let's try again DL-50

RE: Let's try again DL-50
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RE: Let's try again DL-50 - 3/13/2007 12:52:15 AM

PlaneKrazee

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The holes are in the surface, I should have said pits. I have seen this in ZDZ engines also. I'll pop the cylinder off to get a better look, I was veiwing thru the exhaust which on mine is smooth.

Based on the lack of reply by Mr. Ebay and Peak Model I think we can forget about parts/support.

The engine I have will be fed at 30:1 to run in and maybe 40:1 synthetic like DH with his engines.

Do you think the cylinder is chromed?

I think an Echo conversion would be a better buy overall or spring for a DA or other engine that is supported by an American company.

I wrote a long economic rant but deleted it to save the reader from boredom.

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Post #: 76

RE: Let's try again DL-50 - 3/13/2007 1:11:25 AM

Bosshossv8

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From: Schiller park, IL, USA
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Ralph will give us the reality check on this one............
-------------------------------------------------------------------------------------------------------------------------------------

I never believed there would be parts support from the get go. I figured the price reflected that, and knew going in it was a Caveat Emptor situation.

.............................................................................................................................................

I dont see the need for a strengthening plate, only because I believe if it is mounted squarely, and a balanced prop is used on an airplane, not a test stand, there will be no failure unless it takes a hard hit.

Skreamer , your crash doesn;t count in the tab failure test, and neither does the metal test stand failure from my friend.

Show me one that breaks on minor nose over, and I would be concerned.

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Post #: 77

RE: Let's try again DL-50 - 3/13/2007 2:32:47 AM

jrjohn

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From: stevens point, WI, USA
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quote:

ORIGINAL: Skypilot_one

The holes are in the surface, I should have said pits. I have seen this in ZDZ engines also. I'll pop the cylinder off to get a better look, I was veiwing thru the exhaust which on mine is smooth.

Based on the lack of reply by Mr. Ebay and Peak Model I think we can forget about parts/support.

The engine I have will be fed at 30:1 to run in and maybe 40:1 synthetic like DH with his engines.

Do you think the cylinder is chromed?

I think an Echo conversion would be a better buy overall or spring for a DA or other engine that is supported by an American company.

I wrote a long economic rant but deleted it to save the reader from boredom.

why do you care if it's chromed?

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Post #: 78

RE: Let's try again DL-50 - 3/13/2007 2:40:08 AM

jrjohn

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This is something I was thinking about today, and it's not pointed at anybody in particular.

I always have to wonder about the motives of a person when they post. We have to remember one thing. When we read posts either positive or negative. A lot of the time what we read is a bias or slanted opinion. Sometimes it's the competition posting, sometimes it's a friend of the competition, sometimes it's sombody that sells products or does business with the competition.

Sometimes it's people that recieved the products like and ARF or an engine for free so they will do a review and post positive information. Sometimes it's employees or friends of the competition, or just people that have an axe to grind with a particular product because of where it's built. Maybe they are the type that only buys things made in the USA. (If thats the case then they shouldn't even be into RC because you can't fly or build a plane that doesn't have 95% of it's componants built outside the US)

I'm careful about what I believe and don't believe. I don't like listening to sponsored pilots, thats for sure, they have an agenda. I don't want to hear from the competition. You can usually tell when somebody has an agenda, they only talk good or bad about a product, they never tell you the good and the bad.

I really wanted BossHosses's opinion, he's a regular guy, calls a spade a spade. he told us about the good and bad of the DL-50. Obviously he paid for his engine.

You can pull this thing apart and look at it all you want but I care about how it runs!

john

< Message edited by jrjohn -- 3/13/2007 2:46:24 AM >

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Post #: 79

RE: Let's try again DL-50 - 3/13/2007 3:00:56 AM

nmking09

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Runs great, that is the one thing eveyone has seemed to agree on.

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Post #: 80

RE: Let's try again DL-50 - 3/13/2007 3:10:39 AM

PlaneKrazee

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If the cylinder is chromed it will last a while, if it is not it will wear out in a few gallons. I looked at it and it is either nickel or chrome plated. Nickel will not last as long and based on the scratches in the surface I would guess nickel but RCIGN1 will probably be able to tell better that myself.

The top of the cylinder is turned to a dome shape and very rough like the tool chattered. It looks like the aluminum galled. I also saw this in the photo of the cylinder from the closed thread but didn't know what I was looking at in the photo.

When I read posts from the last, now closed thread they were talking about how great the casting was and what a good deal the engine was but there were concerns about QC, longevity and product support.

< Message edited by Skypilot_one -- 3/13/2007 4:47:29 AM >

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Post #: 81

RE: Let's try again DL-50 - 3/13/2007 3:14:33 AM

Herby 1

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All gassers have chrome or Nikasil bores, you can't run piston rings on bare or even hard anodized aluminum...Pits in the bore were there before it was chromed..After the chrome is applied the bore is lightly honed with a diamond or Borazon hone to smooth off the high spots...Pits are not a bad thing, some say they hold oil from the fuel....
If you see swirl marks or cross hatching in the bore the same thing applies---the unfinished bore is honed to make it round and straight, then chromed, then honed again to make it smooth....A rough chrome or Nikasil bore would wear the rings out very fast.....

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Post #: 82

RE: Let's try again DL-50 - 3/13/2007 3:25:39 AM

PlaneKrazee

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I just did a search and couldn't find the photo looking inside the cylinder that had been posted before. Does anyone know where it is? I would like to compare mine.

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Post #: 83

RE: Let's try again DL-50 - 3/13/2007 3:36:20 AM

PlaneKrazee

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John,

I read a post regarding the 3m engine and some asked if it was chroked the reply was no, not no it's nickel or other reply so who knows. No, steel won't wear out that fast and I think it's pretty obvious this engine's cylinder is not made of steel

Anyway,

RBIGN1,

Do you think a mounting plate of 1/4" G10 would be ok or should it be made of metal?

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Post #: 84

RE: Let's try again DL-50 - 3/13/2007 3:53:52 AM

Herby 1

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1/4 G10 will be almost as strong as aluminum for a plate, just costs more

Nobody makes steel cylinders..Some are cast iron, with no liner...Some are aluminum with a cast iron liner, like a Horner twin...Good, but heavy...Most cylinders are aluminum, either cast or machined from bar stock...Nickel is soft and is used most under chrome plating to build up rough surfaces as part of triple plate, copper, nickel, chrome.....Can't be used as a cylinder liner...
All bores are either hard chrome or Nikasil...Chrome is plated on, Nikasil is a metal spray process...Both leave a surface too rough for piston rings, so they're honed smooth..Either will last indefinitely unless some grit is ingested into the cylinder....

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Post #: 85

RE: Let's try again DL-50 - 3/13/2007 4:22:07 AM

PlaneKrazee

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The spark plug hole is missing about 1/3 of the threads, looks like a porous casting or a really bad tapping job. The plug wiggles around when screwed all the way down but not tight. Can the hole be repaired with a helicoil?

I have some 1/8" G10 on hand that I can laminate so it's free

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Post #: 86

RE: Let's try again DL-50 - 3/13/2007 4:22:38 AM

Bosshossv8

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Ralph, when you look at this engine in your hand....please tell us if YOU think it needs some sort of re-inforcing plate on the tabs.

I am of the opinion that it is not neccesary under correct mounting practice, AKA ..a properly drilled, square and true , mounting surface with standoffs. In other words not drilled with a hand drill , all catywampus , without a drill pattern ...hogged out holes in every direction but square.

I am interested in your opinion.

Skypilot, I understand your concerns...I will pull my cylinder in the name of analysis...because I know Ralph will too. Then we will have three to look at....ostensibly from three different sources and times of sale. Who knows maybe they were mates in the little bins we saw.... or maybe we have a Monday, Wedsnday, and Friday motor.....or a hang over motor from after the Chinese New Year!!!!

Levity is needed in this thread to keep it open , so lets have a laugh or two....

Now, I am going back to work on my PREMIUM ARF Chinese made EF Yak-54 88" vs. ...the Reject that I put the Economy 50cc engine in for test. Oh...the PREMIUM ARF ...its gets the PREMIUM Chinese made 50cc.....do I have to say whose??? nah....I love them and they give me great support, I feel bad as it is.

< Message edited by Bosshossv8 -- 3/13/2007 4:23:15 AM >

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Post #: 87

RE: Let's try again DL-50 - 3/13/2007 4:27:44 AM

jrjohn

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Boss, we do need to laugh a little. Hey, I was wondering why your running 87 octane when DL recomended 93. You trying to save some money?

John

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Post #: 88

RE: Let's try again DL-50 - 3/13/2007 4:36:04 AM

Bosshossv8

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I know that they reccomend the 87,.....but I am leary....the translations sometimes has catastrophic consequences....

Case in point....the CRRCPro motor I have for testing.....it was set for 40deg BTDC....a translation error or misunderstanding....

I wonder ifI could hurt it ,,,IF it was really intended for 93...a slower burn .

Ralph?? what are your thoughts??? the instructio nsheet that you will get says, 93....could I have hurt it going 87, if it REALLY needs 93??

I heard no pinging.....

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