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norvel 049 and 061 comeback??

Old 09-12-2010, 09:59 PM
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Default RE: norvel 049 and 061 comeback??

Recycled flyer . That makes sense at those rpms not the usual diesel chugging ( well better than chugging) at maybe a max of 13K martin
Old 09-13-2010, 12:41 AM
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Default RE: norvel 049 and 061 comeback??


ORIGINAL: Recycled Flyer

Don't Enya currently makes lapped counter liner/piston assemblies?

I know that they are not 'conversions' but it shows that its commercially possible.
Yes, it has been done before for cox engines and other engines have it too (Irvine, Enya etc), and for sure it is still doable technologically. But I have not seen that kind of proper conversion heads being available for cox engines currently. Material choice is very important I would like to know how they are made before spending any money on it. Heads with plastic gaskets, and a completely flat combustion space, feels like a rather poor effort to me...
Old 09-13-2010, 06:48 AM
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Default RE: norvel 049 and 061 comeback??

Mr cox at least for the small ones Cox 049-051 norvel 061, the Davis system for them , and flat contra and teflon disc seems the most successful proven over years of use martin
Old 09-13-2010, 08:12 AM
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Default RE: norvel 049 and 061 comeback??

I don't know, I think the RJL design are better than the plastic disk. Would prefer a traditional design though.
Old 09-13-2010, 08:37 AM
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Default RE: norvel 049 and 061 comeback??

Mr Cox the teflon disk is a safety device too, It blows if engine over compressed, discs are cheaper than engines martin
Old 09-13-2010, 11:14 AM
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Default RE: norvel 049 and 061 comeback??

To me they appear to be more of a danger device than a safety device. They will not seal properly and this can trick you into increasing the compression so that when/if it fires it is over compressed and that damages the engine.

If plastic seals are so great, then why don't all diesel conversions have them?
Old 09-13-2010, 05:06 PM
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Default RE: norvel 049 and 061 comeback??


ORIGINAL: Mr Cox

To me they appear to be more of a danger device than a safety device. They will not seal properly and this can trick you into increasing the compression so that when/if it fires it is over compressed and that damages the engine.

If plastic seals are so great, then why don't all diesel conversions have them?
Iwhole heartedly agree mate,the time and effort that goes into a lapped contra piston's manufacture is repaid with years of trouble free use.

Ihave an 'O' ring head and the fact that it was supplied with many spares tells me to expect that I will have to use them at some stage.

This will involve pulling the head off engine the engine and maybe disturbing the liner and then having to lap in the piston fit again.

And good point with the plastic seal fooling you into upping the comp - I never thought of it that way.

Cheers.

Old 09-13-2010, 06:39 PM
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Default RE: norvel 049 and 061 comeback??

Has anyone else here actually run a Norvel 061 with a Davis conversion? If so, did you consider it worthwhile?
Old 09-14-2010, 12:42 AM
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Default RE: norvel 049 and 061 comeback??

I haven't run any Norvel so far on DDD conversion heads, only cox engines. Using or rather trying to use the plastic seal was not worth the trouble to me, but with a brass seal on the same head they will run and are powerful.
Old 09-14-2010, 08:11 PM
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Default RE: norvel 049 and 061 comeback??

Bernie you have done a great Job keeping cox alive (maybe reborn) for a source of engines and Cox parts, But I do see an ethical issue copying the Davis head, you can buy them from davis and of course resell them, and folks get them from Davis of course
Davis and others like yourself have only a few employees ,and Davis all items USA made, I feel folks like this need our support to stay around. You can reach a point of dilution of sales and you are no more, Chinese "farmouts" are now the thing and the latter of course as we know have quality issues. Also if anything goes askew with the head it not only reflects on you but also Davis (since direct copy). Taking this a step further Fox I think makes other stuff besides engines to stay around and PAW is kept alive with their automotive racing parts. Think Bisson mufflers are in Canada, do not know if any knock offs from China to effect them yet
MECOA RJL diesel head is out the loop on this since just the common generic contra with the compression screw
martin
We need the quality guys out there USA, Canada,Australia, UK, Europe, Japan
Old 09-14-2010, 09:38 PM
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Default RE: norvel 049 and 061 comeback??

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Martin,

I am not too sure if the gist of your post is your concern with Chinese made parts, design copy or both, but I shall address both issues.

First, let me assure you that your concerns are valid. My approach to China is a cautious one but the reality is that China can produce some tremendous quality. However, one must pay big $$’s for this and not seek bottom pricing. The Dell server that powers our store is manufactured there, for example.

As to the diesel conversions that we sell, they are 100% manufactured in the USA. They consist of 5 parts: Body, contra piston, compression screw, spring and Teflon disc.

The spring was manufactured by Pepka Spring in Kokomo, Indiana. The bodies, contra pistons and compression screws were manufactured by NAHMCO in Dayton, Nevada. The Teflon discs were supplied by a well-known Cox competitor of ours, who had them manufactured in the USA; although I don’t know by whom.

This may shock some of you but, of the 86 Cox parts that we have manufactured so far, only 6 were made in China. A further 2 were USA made; whereas a secondary operation was performed in China. This equates to 93% of items that we have made post-Cox are actually USA/Canada made.

To the issue of copying, I have stated this before; it was unintentional (seriously). I had entrusted a machine shop with the production of them; requesting a design similar to the inside but a strong variation to the outside. The new design they drew up was good and I approved production.

After months of inactivity on the part of the machine shop, I requested they send everything to a competing company. What I did not realize at the time is that they did not send the design modifications. I did not follow up either and therefore dropped the ball – my fault.

When the finished product arrived I literally gagged. However, I had the options of either scrapping the product or simply selling it. I choose the latter as the design was not the subject of design copyright. Well, at least it’s flattering to its creator, I guess . By the same token it does remain a blemish in my thoughts as that is not how we normally operate.

I continue to maintain that our products meet or exceed OEM Cox criteria and we unconditionally guarantee each and every item that that we sell.

Bernie

www.coxengines.ca

Old 09-17-2010, 12:39 AM
  #37  
DeviousDave
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Default RE: norvel 049 and 061 comeback??

I think I would have been tempted to eat those diesel conversions rather than people seeing them for what they are. Expired patent or not, it's someone else's work.
Old 09-17-2010, 09:31 AM
  #38  
ddd
 
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Default RE: norvel 049 and 061 comeback??

Our heads work well on the Norvel .048 or .061, thank you.
Old 09-17-2010, 09:43 AM
  #39  
AMB
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Default RE: norvel 049 and 061 comeback??

Devious Dave- Totally agree, If you look at the products Davis has produced over the years QUALITY RULES, besides the head for the coxes, as we know his Killer crank for the Coxes solved the issue for broken cranks for the reed valve Coxes run as glow or diesel, a piston reset tool to take up the slop in the rod/piston assembly, even cleaning brushs
It goes further if you check the Davis diesel site you will see the "sister site" Marbo skin care, again quality and results, if not better than the rest would not exsist martin

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