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freebeard · 08-30-2020, 11:22 PM

Welcome to air-cooled world. Remember: antifreeze is poisonous to puppies and kittens. Consider this:

Hot VWs magazine took a Beetle from 28 to 39.9mpg with their Mileage Motor build.

It was based on work by Jon Karcey, described in a seven page The Samba thread here: https://www.thesamba.com/vw/forum/vi...er=asc&start=0

The work was carried forward by Jake Raby into the Type IV (912) world: Raby Aircooled Technology – The Most Advanced Aircooled Engines for Vintage VW and Porsche cars.

The Hot VWs series was at CB Performance but now it 404s: https://www.thesamba.com/vw/forum/viewtopic.php?t=97269. Maybe try Internet Archive.

TLDR; square bore/stroke, high reciprocating mass, Hall effect ignition, air dam, Jet-a-Vator, low-friction lubricants, 145s on the front, etc, & etc.

If you don't want to go Type IV, then the Emorys cut flat sixes down into DOHC flat fours. https://www.emorymotorsports.com/the-engine/

Best mileage I ever got with my 1971 Superbeetle was 38mpg over 1300 miles, running through Eastern Oregon in the middle of the night at 45mph, on the way to Bonneville.

08-30-2020, 11:22 PM	#12 (permalink)
freebeard Master EcoModder Join Date: Aug 2012 Location: northwest of normal Posts: 27,766 Thanks: 7,799 Thanked 8,604 Times in 7,085 Posts	Welcome to air-cooled world. Remember: antifreeze is poisonous to puppies and kittens. Consider this: Hot VWs magazine took a Beetle from 28 to 39.9mpg with their Mileage Motor build. It was based on work by Jon Karcey, described in a seven page The Samba thread here: https://www.thesamba.com/vw/forum/vi...er=asc&start=0 The work was carried forward by Jake Raby into the Type IV (912) world: Raby Aircooled Technology – The Most Advanced Aircooled Engines for Vintage VW and Porsche cars. The Hot VWs series was at CB Performance but now it 404s: https://www.thesamba.com/vw/forum/viewtopic.php?t=97269. Maybe try Internet Archive. TLDR; square bore/stroke, high reciprocating mass, Hall effect ignition, air dam, Jet-a-Vator, low-friction lubricants, 145s on the front, etc, & etc. If you don't want to go Type IV, then the Emorys cut flat sixes down into DOHC flat fours. https://www.emorymotorsports.com/the-engine/ Best mileage I ever got with my 1971 Superbeetle was 38mpg over 1300 miles, running through Eastern Oregon in the middle of the night at 45mph, on the way to Bonneville. __________________ . .Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster ____________________ . .Two wrongs don't make a right, but three lefts do. Last edited by freebeard; 08-30-2020 at 11:28 PM..