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Dusty1
Samba Member
Joined: April 16, 2004
Posts: 2089
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 Posted: Fri Jun 06, 2025 12:10 pm Post subject: 800cc "Single Port" |
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Working on a deal for a Bug with the ubiquitous extra "pile o' parts". The interesting feature of the pile is 2 1/2 extra motors. We could calculate the 1/2 motor as the usual "Well, it looks like around half the parts we need for another motor" but no. This one has been band sawed in half for aircraft use. I see half a counterweighted crank, half a cam and of course half a case the hard way. There's an extra dual port cylinder head for when I get around to sawing that in half.
Hey! I just figured out what to do with those heads that have one destroyed combustion chamber.
"Dusty, just buy a durn Rotax."
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14699
Location: Western Canada
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| Posted: Fri Jun 06, 2025 1:42 pm Post subject: Re: 800cc "Single Port" |
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Put the engine in the Buggy and see if you can make 45 mpg at 50 mph! Take the CR up to 9/1, use a vacuum advance distributor and a 28mm Solex. A 800cc well tuned engine just might do it! Oh yes, drum brakes and skinny tires too.
I would do that in a heart beat just for the bragging rights!
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Dusty1
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Joined: April 16, 2004
Posts: 2089
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| Posted: Fri Jun 06, 2025 5:30 pm Post subject: Re: 800cc "Single Port" |
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there are parts that shouldn't be cut in half such as rocker arms.
I need to look at my "modified" crank. Seems they lopped off the section that accepts the timing gears.
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Glenn 
Mr. 010
Joined: December 25, 2001
Posts: 79415
Location: Sneaking up behind you
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| Posted: Fri Jun 06, 2025 5:53 pm Post subject: Re: 800cc "Single Port" |
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How about 2/3 of an engine?
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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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rayjay
Samba Member
Joined: March 26, 2008
Posts: 1590
Location: Buford GA
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| Posted: Fri Jun 06, 2025 5:59 pm Post subject: Re: 800cc "Single Port" |
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| Many moons ago when the ECTA was running at Maxton NC I contemplated a 1000cc ACVW powerplant. 250cc per hole was what I was thinking about. Much later it occurred to me that the better bet might be a 500cc per hole twin so I read a bunch of homebuilt aircraft info. For car use the best bet would be to not cut anything in half but instead just leave off cylinders 2 and 4. This way you have an intact belhousing and flywheel mounting arrangement. Just have to plug off all the unnecessary oil passages. |
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NJ John
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Joined: September 21, 2007
Posts: 2860
Location: HdG, MD & NJ
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| Posted: Fri Jun 06, 2025 6:36 pm Post subject: Re: 800cc "Single Port" |
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Pics please.
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage |
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Dusty1
Samba Member
Joined: April 16, 2004
Posts: 2089
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| Posted: Sat Jun 07, 2025 12:51 pm Post subject: Re: 800cc "Single Port" |
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| rayjay wrote: |
| Many moons ago when the ECTA was running at Maxton NC I contemplated a 1000cc ACVW powerplant. 250cc per hole was what I was thinking about. Much later it occurred to me that the better bet might be a 500cc per hole twin so I read a bunch of homebuilt aircraft info. For car use the best bet would be to not cut anything in half but instead just leave off cylinders 2 and 4. This way you have an intact belhousing and flywheel mounting arrangement. Just have to plug off all the unnecessary oil passages. |
Think of all the ugly weight you'd eliminate. Seems to me you would need to leave two of the rockers off each head and plug your newly formed oil leaks at the lifters. Plug the oil passages in the crank to the two missing connecting rods.
| NJ John wrote: |
| Pics please. |
One of these days I'll dig the debris out from under the 14' U-Haul full of parts I just got. Otherwise it looks like half a case, half a crank and half a cam modified by a real "live in the moment!" kinda guy. "Live in the moment!" as in do the obvious part first, worry about makin' it work later.
| Glenn wrote: |
| How about 2/3 of an engine? |
Ooh that's cool! I want one.
Come to think of it wouldn't be the first time I had a size cylinder running on four. We're talkin' my old farm truck and just about every six cylinder Chevy I've owned at one time or another.
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rayjay
Samba Member
Joined: March 26, 2008
Posts: 1590
Location: Buford GA
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| Posted: Sat Jun 07, 2025 3:37 pm Post subject: Re: 800cc "Single Port" |
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| Dusty1 wrote: |
Think of all the ugly weight you'd eliminate. Seems to me you would need to leave two of the rockers off each head and plug your newly formed oil leaks at the lifters. Plug the oil passages in the crank to the two missing connecting rods.
moment!" as in do the obvious part first, worry about makin' it work later.
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Come to think of it wouldn't be the first time I had a size cylinder running on four. We're talkin' my old farm truck and just about every six cylinder Chevy I've owned at one time or another.[/quote]
There's plenty of videos of guys doing the conversion at home. Sealing the back end of the crankcase is quite fiddly. Then you have some welding on the heads to create a valve cover gasket surface on the sectioned head. For my idea I think leaving the heads as is along with installing the other 2 cylinder barrels sans pistons and rods and torqueing it all down like a stock motor. |
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NJ John
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Joined: September 21, 2007
Posts: 2860
Location: HdG, MD & NJ
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Dusty1
Samba Member
Joined: April 16, 2004
Posts: 2089
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| Posted: Sat Jun 07, 2025 5:54 pm Post subject: Re: 800cc "Single Port" |
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Oh, cool! I need to figure out a way to bolt a flywheel to the other end.
The one I have is the back half.
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NJ John
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Joined: September 21, 2007
Posts: 2860
Location: HdG, MD & NJ
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| Posted: Sun Jun 08, 2025 10:12 am Post subject: Re: 800cc "Single Port" |
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Put it in a motorcycle or mid engine trike.
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14699
Location: Western Canada
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| Posted: Sun Jun 08, 2025 2:47 pm Post subject: Re: 800cc "Single Port" |
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That would be cool too!
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Dusty1
Samba Member
Joined: April 16, 2004
Posts: 2089
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| Posted: Tue Jun 10, 2025 5:12 am Post subject: Re: 800cc "Single Port" |
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| NJ John wrote: |
| Put it in a motorcycle or mid engine trike. |
| oprn wrote: |
| That would be cool too! |
Not to be a ghoul but I may inherit a chopped 1950s BMW. The bike was modified into a hooligan bike / street fighter back when the current crop of street fighters were only a glimmer in their grandma's eye. The bike has sidecar gearing, quicker stop light to stop light, a James Dean (or Bud Ekins or Steve McQueen) style Bates seat and reversed pillion as well as other cool period parts and modifications.
Who would do that to a BMW?!
Make restorers cringe.
Same rich uncle has an astonishingly low mileage L88 Vette in his living room. It hasn't moved in 50 years.
I'll reiterate my stance on trikes especially VW based trikes: Trikes combine the worst characteristics of motorcycles with the worst characteristics of cars.
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Last edited by Dusty1 on Tue Jun 10, 2025 12:23 pm; edited 1 time in total |
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NJ John
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Joined: September 21, 2007
Posts: 2860
Location: HdG, MD & NJ
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| Posted: Tue Jun 10, 2025 7:39 am Post subject: Re: 800cc "Single Port" |
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Ok, how about a super MPG bug or Ghia?
Does the BMW have the separate trans that’s sometimes used for VW swaps?
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage |
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Dusty1
Samba Member
Joined: April 16, 2004
Posts: 2089
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| Posted: Tue Jun 10, 2025 8:29 am Post subject: Re: 800cc "Single Port" |
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| NJ John wrote: |
Ok, how about a super MPG bug or Ghia?
Does the BMW have the separate trans that’s sometimes used for VW swaps? |
Yeah the older BMWs can be mated to VW engines.
Super MPG: Sometimes tiny motors get crappy fuel economy because they need to work too hard. Trick is to get as much power or more compared to stock from a smaller motor. My favorite is the old Geo Metro (Suzuki) 1 liter three cylinder.
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NJ John
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Joined: September 21, 2007
Posts: 2860
Location: HdG, MD & NJ
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| Posted: Tue Jun 10, 2025 9:14 am Post subject: Re: 800cc "Single Port" |
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Metro’s were 50mpg. Not bad for the early 90’s. Drove plenty of them when working the lube rack at a Chevy dealer. Turbo Chevy Sprints, too.
_________________
1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage |
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oprn
Samba Member
Joined: November 13, 2016
Posts: 14699
Location: Western Canada
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| Posted: Tue Jun 10, 2025 9:29 am Post subject: Re: 800cc "Single Port" |
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I might be totally out to lunch here but I am begining to think that ore size is related to MPG more so than displacement. A smaller bore size to get better flame travel and a more complete burn.
I cannot think of any engine in the past with a bore approaching 4" that got good fuel economy. I don't know about the modern crop of engines though.
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