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Enya 35 muffler question

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Old 06-08-2019, 01:00 PM
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Wagon1
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Default Enya 35 muffler question

Hello! I picked up a beautiful, never run(apparently) Enya 35 at a swap meet. I have found manuals online, but I have two questions about the muffler. First, there is not a nipple for the back pressure line. Should I add one? Second, there is an adjustment vent that open or closes two ports on the outside of the muffler. What is this for?

I tried adding a pic but it looked like it would fill the page and I'm not sure how to adjust it.

Thanks!

Mike
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Old 06-08-2019, 01:30 PM
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Lee Taylor
 
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Default Old style model glow engines

I have an Enya 45BB from back in the day. I think I bought it around 1975. I put lots of miles on it. I do remember that plate. In the 60's we did not use mufflers. They had not been invented yet. Or lets just say I had never seen one. SO when I saw the plate on the Enya my little brain said to me it was just a way of going in the direction of running no muffler. We use to use the nipple to add pressure to the fuel tank. The idea was to get a more steady and uniform fuel flow. If the engine did not have a nipple we did not usually bother adding one

Last edited by Lee Taylor; 06-08-2019 at 01:46 PM.
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Old 06-08-2019, 01:44 PM
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Here is a photo of the adjustment vent

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Old 06-08-2019, 01:54 PM
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If you do add a nipple you want to make sure it is not a blind hole. In other words, it has to get its pressure out of the crankcase. The OS60 muffler has a nipple. In that case the muffler pressure can be used if desired.
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Old 06-08-2019, 03:29 PM
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Yes, add the nipple on the muffler for more consistent runs. The window I beleive was to drain exhaust residue from the muffler. That engine was made when fuels with higher levels of castor oil was more the norm due to the metals chosen for the piston and liner. Castor is a heavier more viscous oil then the modern synthetics and tended to pool somewhat in the mufflers.
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Old 06-08-2019, 04:12 PM
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Originally Posted by speedracerntrixie View Post
Yes, add the nipple on the muffler for more consistent runs. The window I beleive was to drain exhaust residue from the muffler. That engine was made when fuels with higher levels of castor oil was more the norm due to the metals chosen for the piston and liner. Castor is a heavier more viscous oil then the modern synthetics and tended to pool somewhat in the mufflers.

Actually the plate on the early Enya mufflers was to allow exhausting priming for starting-and featured on all the Enya mufflers of the era other than the 049/06/08/10 unit. Fuji mufflers were similar. Likewise OS mufflers of the later 60s had a small hole for priming in the muffler casing directly opposite the exhaust opening...a practice that was eventually dispensed with...

ChrisM
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Old 06-08-2019, 05:16 PM
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Lee Taylor
 
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All that makes perfect sense to me
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Old 06-08-2019, 06:30 PM
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What size pressure fitting for medium tubing? Tower sells 8-32 and 10-32.
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Old 06-16-2019, 05:14 AM
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These engines had great fuel drawing ability, you may not need a pressure nipple at all. These older engines had, by todays standard, a very small intake diameter which increased fuel draw.

The search for more and more power resulted in larger carb intake diameters which greatly reduced fuel draw, hence the need for muffler pressure. Some of the best running and idling engines I have ever run were older engines, without mufflers, small intake diameters, and exhaust restrictors. The search for power largely destroyed the best properties of glow engines.

I would run it as is but be sure you use fuel with plenty of castor oil, at least 20% total oil with at least 1/2 of that castor oil.

Last edited by 049flyer; 06-16-2019 at 05:17 AM.
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Old 06-16-2019, 05:50 AM
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I agree with 049flyer. The mufflers came without pressure fittings because they didn’t need them generally. One thing that muffler pressure will give you that a suction system won’t is a more consistent fuel flow from full tank to empty. The empty tank leanout will be a little more apparent on a suction system than it would be on a pressure system. At least for me anyway.
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