Aircooled engines run much higher cylinder head temps than liquid cooled engines, meaning a higher risk of detonation. Yes, I'd run premium without question. An aircraft engine with 8.5:1 pistons needs a minimum of 93 octane fuel.
On Sun, May 23, 2021 at 5:37 PM Allan Streib via Mercedes < mercedes@okiebenz.com> wrote: > You may recall I picked up a Karmann Ghia last November. Not wanting to > subject it to any salt or winter it has been in the garage since then. I > got it out today and it started up and ran nicely. It ran pretty rough > in the driveway the few times I tried to run it during last winter so I > figured I'd need to clean out the carbs and give it a general tune up. > > However it is running much better now. I added about 5g of fresh gas and > half a bottle of Techron but not sure that really made a difference. > > It has a dual carb setup with Webers and I took a closer look and they > don't seem to have any choke mechanism at all. So that would explain the > rough running in the cold. I guess the car was set up as a summer > driver. Not sure if such a thing is commonplace? > > I found in the documentation that with the rebuilt the prior > owner installed has a 9:1 compression ratio. So I guess I should > probably buy at least mid-grade gas for it? Or premium? > > I also discovered some rust on the passenger side rear floorpan. Not > catastrophic but probably need to replace about a square foot of it. A > project for next winter. The rest of the car seems solid. > > Need to track down an extra wheel for a spare tire, as that is > missing. Anyone know of a good Aircooled email list? > > Allan > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > -- OK Don "Whenever you find yourself on the side of the majority, it is time to pause and reflect." Mark Twain “Basic research is what I’m doing when I don’t know what I am doing.” Wernher Von Braun 2013 F150, 18 mpg 2017 Subaru Legacy, 30 mpg 1957 C182A, 12 mpg - but at 150 mph! _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
