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Author Topic: This may be of interest to ENYA experts  (Read 1378 times)

Offline Robert Zambelli

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This may be of interest to ENYA experts
« on: November 17, 2012, 07:35:30 PM »
I found these two engines that I thought were identical.
Both model 5001 but one is a 35 and the other is a 36.

Comments?

                          Bob Z.

Offline ash

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Re: This may be of interest to ENYA experts
« Reply #1 on: November 17, 2012, 08:30:56 PM »
I predict (with no evidence) that the 36 has a higher compression head and possibly hotter timing.
Adrian Hamilton - Auckland, NZ.

Offline Paul Smith

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Re: This may be of interest to ENYA experts
« Reply #2 on: November 18, 2012, 07:41:08 AM »
In AMA the limit for CL Combat was, and still is .36 cubic inches.

I believe this limit was chosen so as to allow the the large number of 35's on the a market and give them a little slack.  After while Fox came out with a true 36 and even offered "upgrade" crankshafts so owners of Fox Combat 35's could capture the missing .01 cubic inch.  Since then, all purpose-built combat engines were called "36's"  regardless of the true displacement. 

I've owned a few Enya's and regretably, they're not as strong as they look.  I would not recommend running an Enya like you have to to win combat or racing.  In my experience they won't take it.  Maybe Enya followed suit and relabeled their engine to take a shot at the US combat market.
Paul Smith

Offline Steve Thomas

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Re: This may be of interest to ENYA experts
« Reply #3 on: November 18, 2012, 03:25:06 PM »
Sorry, it's nothing to do with combat, higher compression or hotter timing.  What Robert has is something a bit more interesting.

AFAIK the 5001 .36 was AFAIK Enya's first engine in this capacity range, but was only produced for a year or so before being replaced by the almost identical 5001 .35.  The only reason I've seen was to bring it into line with the 'standard' size.  As such, the .36 is rather rare, but on the odd occasions when they do turn up, they don't seem to go for much money - perhaps because people don't realise what they are?

I got hold of one in mint, unrun condition for only about $30 a while ago.  It started and ran well, but being a traditional Enya will take a lot of running-in before it's usable.

Here's a bit of data from an article by Bob Allen, lifted from the Supercool site.  The difference in quoted power between the .36 and .35 is interesting - whether it was really the case or just for marketing, I wouldn't know.

I'm not sure about Enyas being 'not as strong as they look' - the .29 had a good reputation in TR, and overall they've got a reputation for being plenty powerful and pretty hard to break.

Steve



"With regard to the fabled ENYA 36 mentioned elsewhere, I have found some technical data on this engine, and have included it in a comparison with
the following Model 5001 ENYA 35 -
 
                    Bore             Stroke              Capacity                           Factory claimed max. HP                 Comp. Ratio
ENYA 36         0.794 in        0.735 in            0.36 cu. in. or 5.99 cc         0.60                                             7 : 1
ENYA 35         0.794 in.       0.715 in            0.354 cu.in. or 5.8 cc          0.70                                             7 : 1               "

Offline Brian Hampton

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Re: This may be of interest to ENYA experts
« Reply #4 on: November 18, 2012, 06:50:16 PM »
Here are a couple of comments about the 36 taken from Bob Allan's compendium on all things Enya.

"The 36 being listed seems to date this sheet (Enya catalogue) to the first half of 1955. This engine was only produced for a short period, which explains its status, alongside the later 29 Racing Special and the 3-bolt 19 as one of the three rarest, air cooled, production Enyas of all time."

"The decision by Enya to make a 36 size engine probably the result of rival OS releasing their 36 in 1953 (apparently, around this time, Fuji had a 36 as well), specifically for distribution in the US by the (Bill) Atwood Company. One theory on why the 36 was so short lived is – during 1955, it was discovered that quite a few 35 size engines in the States actually displaced more than the 0.350 cu. in. limit set by the AMA.  As an example (when discussing this anomaly) Chinn revealed (in MAN April 1956) that both the FOX 35 and Sabre 35 were actually 0.3519 cu. in., the K&B Torpedo 35 was 0.3529 cu. in., and the OS Max 1 35 was at 0.3555 cu. in.  Possibly these discrepancies in “pushing the boundaries” were small enough to overlook initially, but eventually perhaps it was thought wise to curb this trend of ever increasing illegal capacity, thus Enya had to more or less scrap their 36 immediately. One other theory is, the capacity was reduced to comply with a 0.35 cu. in. limit on C/L Combat engines, yet another that maybe OS were confused in the first place by the 0.349 cu. in. McCoy 36."

The 36 was only in production for a year, being replaced mid '56 by the 35 model 5001.

Offline Steve Helmick

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Re: This may be of interest to ENYA experts
« Reply #5 on: November 18, 2012, 11:09:52 PM »
Hmmmm. I don't recall a time when .36 was not the specified maximum allowed displacement over here in Combat, but I didn't start combat until '63. Was it originally .35 here? When was the upper limit changed?  ??? Steve
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