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RobE30
Samba Member
Joined: June 30, 2009
Posts: 81
Location: Coopersburg PA
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 Posted: Sun Feb 23, 2025 12:16 pm Post subject: Revmaster 2100d |
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I think this is the correct forum for this.
I have the opportunity to get a revmaster 2100d engine with approximately 150 hours on it. Hasn't been run since the mid 80s but turns over etc.
From a quick Google search, looks like is a 78 crank with 92mm pistons and a dual magneto setup. Not sure if it'd be worth getting and repurposing it for use in my bug.
Thanks for any info |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27716
Location: Colorado Springs
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| Posted: Sun Feb 23, 2025 12:45 pm Post subject: Re: Revmaster 2100d |
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It should be easier to convert the aviation engine back into a car engine than the reverse, so that's good.
But if you can do it or not, that's up to you. I don't know what abilities you have. |
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ArnoudH
Samba Member
Joined: December 30, 2008
Posts: 178
Location: The Lowlands
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| Posted: Sun Feb 23, 2025 2:08 pm Post subject: Re: Revmaster 2100d |
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| Don't those cranks have a different snout and a larger bearing in the case to go with that? |
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FarmerBill 
Samba Member
Joined: July 25, 2017
Posts: 877
Location: New England
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| Posted: Sun Feb 23, 2025 2:31 pm Post subject: Re: Revmaster 2100d |
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| ArnoudH wrote: |
| Don't those cranks have a different snout and a larger bearing in the case to go with that? |
Yep, you would have to adapt or machine a pulley to fit the snout. Some pictures of the crank and case on Revmasters site. 2300 engine but I believe the crank is the same.
https://revmasteraviation.com/wp-content/uploads/2017/07/Revmaster-R-2300.pdf |
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Alstrup
Samba Member
Joined: July 12, 2007
Posts: 7873
Location: Videbaek Denmark
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| Posted: Sun Feb 23, 2025 2:39 pm Post subject: Re: Revmaster 2100d |
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| RobE30 wrote: |
I think this is the correct forum for this.
I have the opportunity to get a revmaster 2100d engine with approximately 150 hours on it. Hasn't been run since the mid 80s but turns over etc.
From a quick Google search, looks like is a 78 crank with 92mm pistons and a dual magneto setup. Not sure if it'd be worth getting and repurposing it for use in my bug.
Thanks for any info |
Uhh!
There is the basis for a super nice twin spark 2165. (with 94 barrels) 
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GhiaFreude
Samba Member
Joined: March 18, 2010
Posts: 67
Location: Baltimore, MD
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| Posted: Mon Feb 24, 2025 5:57 pm Post subject: Re: Revmaster 2100d |
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| modok wrote: |
It should be easier to convert the aviation engine back into a car engine than the reverse, so that's good.
But if you can do it or not, that's up to you. I don't know what abilities you have. |
This is not the case, it's actually easier to convert a car engine to aircraft use, permanent modifications are done to the revmasters for aviation use, mainly the crank and case are heavily modified.
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Announcing your plans is a good way to hear God laugh...
~1964 Ghia coupe "Freude"~ |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 79792
Location: Sneaking up behind you
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| Posted: Mon Feb 24, 2025 6:30 pm Post subject: Re: Revmaster 2100d |
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I would think that aircraft engines are designed for constant rpm and not changing rpm and gears.
_________________
Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
Member #1009
#BlueSquare
עַם יִשְׂרָאֵל חַי |
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modok
Samba Member
Joined: October 30, 2009
Posts: 27716
Location: Colorado Springs
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| Posted: Mon Feb 24, 2025 11:28 pm Post subject: Re: Revmaster 2100d |
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| GhiaFreude wrote: |
| modok wrote: |
It should be easier to convert the aviation engine back into a car engine than the reverse, so that's good.
But if you can do it or not, that's up to you. I don't know what abilities you have. |
This is not the case, it's actually easier to convert a car engine to aircraft use, permanent modifications are done to the revmasters for aviation use, mainly the crank and case are heavily modified. |
oh, ok |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14915
Location: Western Canada
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| Posted: Tue Feb 25, 2025 4:06 am Post subject: Re: Revmaster 2100d |
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| Glenn wrote: |
| I would think that aircraft engines are designed for constant rpm and not changing rpm and gears. |
Which is easier on the engine by far. However I think it would be remiss to say Revmaster downgrades the engine to accommodate it doing an easier job. In fact looking though that PDF file many parts are actually upgraded over the stock parts not down graded.
One thing that surprised me was that they went to a 36mm oil pump. Having run 26mm pumps I cannot comprehend the need for that much volume increase. Waste of power in my view and extra stress on oiling system parts.
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Our cars get old, we get old but driving an old VW never gets old! |
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RickS
Samba Member
Joined: May 05, 2005
Posts: 610
Location: Speonk, NY
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| Posted: Tue Feb 25, 2025 5:18 am Post subject: Re: Revmaster 2100d |
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| oprn wrote: |
| Glenn wrote: |
| I would think that aircraft engines are designed for constant rpm and not changing rpm and gears. |
Which is easier on the engine by far. However I think it would be remiss to say Revmaster downgrades the engine to accommodate it doing an easier job. In fact looking though that PDF file many parts are actually upgraded over the stock parts not down graded.
One thing that surprised me was that they went to a 36mm oil pump. Having run 26mm pumps I cannot comprehend the need for that much volume increase. Waste of power in my view and extra stress on oiling system parts. |
I think they are using the extra oil pressure/volume for a variable pitch prop. |
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FarmerBill
Samba Member
Joined: July 25, 2017
Posts: 877
Location: New England
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| Posted: Tue Feb 25, 2025 7:43 am Post subject: Re: Revmaster 2100d |
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| RickS wrote: |
I think they are using the extra oil pressure/volume for a variable pitch prop. |
Some of the oil pumps Revmaster uses also drive the fuel pump. It has an eccentric gear and push rod. I'm not sure what the benefits are. |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14915
Location: Western Canada
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| Posted: Tue Feb 25, 2025 7:58 am Post subject: Re: Revmaster 2100d |
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| RickS wrote: |
| I think they are using the extra oil pressure/volume for a variable pitch prop. |
Ah! I was wondering but not sure if that was a thing.
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