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| Engines Discuss engines |
Topic Review (Newest First)
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| 03-17-2013 08:42 AM | ||||
| bbbair |
Re: Write-up: Installing a Bowman ring in a DLE-20 I asked Frank a few questions too and the answers are; "I custom make rings a lot different from the way manufacture’s mass produce rings, 1 at a time. Tighter gap .001 to .002 & round to begin with. Manufacturer’s ring’s wide gap means compression loss and not round, more compression loss. I put less tension in my rings which means lower operating temperatures, more compression lower idle better mid-range higher peak RPM. If You don't replace your ring, it just won't perform as well. If you do, better performance. If you are having starting problems besides ring could be open reed, common on China engines." So there you have it. 
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| 02-20-2013 07:49 AM | ||||
| jbach |
Re: Write-up: Installing a Bowman ring in a DLE-20 I went a step farther...I was mostly pokin' some fun at a couple 3W guys talking about their red heads...  (port matched and a radius put on the muffler flange too) |
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| 02-06-2013 09:46 AM | ||||
| grosbeak |
Re: Write-up: Installing a Bowman ring in a DLE-20 I have read reports of an increase of several hundred RPM, but I have nothing more specific than that. The response I saw was enough to convince me, though. |
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| 02-06-2013 09:44 AM | ||||
| Mike Sebastien |
Re: Write-up: Installing a Bowman ring in a DLE-20 Quote:
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| 02-06-2013 09:32 AM | ||||
| paulbipe |
Re: Write-up: Installing a Bowman ring in a DLE-20 Perhaps a better way of saying it is that the Bowman ring restores cylinder compression to the design specifications by manufacturing the ring to a tighter tolerance. This should lower blow-by past the ring and improve performance across the rpm range of the motor. What I would be interested in is some testing numbers of the before and after ring installation on the idle and maximum rpm's on a motor. |
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| 02-06-2013 08:48 AM | ||||
| grosbeak |
Re: Write-up: Installing a Bowman ring in a DLE-20 Quote:
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| 02-06-2013 08:42 AM | ||||
| Mike Sebastien |
Re: Write-up: Installing a Bowman ring in a DLE-20 How does it increase compression and is there and detrimental effects to the engine? |
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| 02-06-2013 08:32 AM | ||||
| grosbeak |
Re: Write-up: Installing a Bowman ring in a DLE-20 Quote:
Quote:
Quote:
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| 02-06-2013 08:20 AM | ||||
| Mike Sebastien |
Re: Write-up: Installing a Bowman ring in a DLE-20 What is the advantage of a "bowman ring"? |
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| 02-05-2013 11:34 PM | ||||
| jbach |
Re: Write-up: Installing a Bowman ring in a DLE-20 Good question.  I've gone ahead a got right down to business on the engine. You could easily get this done in an evening and I now highly recommend doing the same to yours at some point. The only thing holding me from finishing is the ring that Frank sent and the gasket set that VVRC has in the mail for me. I was a bit surprised to find that I could see the florescent bulb shining through the reed block when I held it up towards it. Upon further disassembling, the reed block looked like it had been trued with 180 grit. When I put it to the glass and 320 grit paper I noticed quite the bow to the longitudinal sides of each side of the block. It looks much better now that its actually flush. You can tell just by looking at the reeds in that they sit nicer. I managed to remove and true the other phenolic spacer/reducer as it seemed a bit unfinished and rough. The gaskets definitely were doing their job. Hard to tell at first but you get to appreciate your effort when you see the progress you make. I took all mating surfaces to the glass and 320 grit. Blew with compressed air and thoroughly cleaned with solvents. |
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