90 vs 91 Octane Gasoline

[WhirledTraveller]

I can tell you that the rubber line used in marine outboards starts to look cracked at the ends at the 10 year mark, and they aren't exposed to much heat unlike the hoses above our air-cooled engines.

It's been 8 years since I did mine and I'm about to tackle the project again.
_________________
1977 Westy, Automatic. Big Valve heads, CS Cam.

[Wildthings]

[WhirledTraveller]

[Wildthings]

[udidwht]

In my RV (94 Fleetwood Southwind Storm) P30 454 TBI I always prior to putting into storage (around late Sept~Oct) put (1) large 80 gallon treatment of Sta-Bil into the fuel tank (60 gal.) then fill it full. Then turn on the generator for ~ 20mins with half load. Drive to storage and park. Cover RV.

Come ~7 months later she fires up perfectly including the generator(Onan MIcroquiet 4K)
_________________
1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
71mm Stroke
73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
Bosch SVDA w/Pertronix module (7.5 initial 28 total @ 3400rpm)
Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
185R14 Hankook tires

[Amskeptic]

[Whaanga]

As a follow up - I filled up today with the 90 octane non-ethanal gas. I looked for any kind of technical information and as you can see in the first photo, no details are given. In the second photo, they do provided R + M/2 - not really sure what I'm getting here - except having my wallet drained ($3.50 per gallon). Of course this is NY so we pay HIGH gas taxes (along with everything else).

_________________
Late 1973 Bay w/a transplanted 914 Engine

[WhirledTraveller]

R + M / 2 is the standard in the USA and is the same as AKI (anti knock index).

90 is perfectly fine for most any non-race engine.

I wish I could get that for my small engines. Here in Mass non ethanol is nowhere to be found.
_________________
1977 Westy, Automatic. Big Valve heads, CS Cam.

[richparker]

Saw this sticker today when I was pulling my tank, made me think of this thread.

_________________
__________
’71 Westy build
Adventure thread
’65 Deluxe Build
’63 Deluxe Build

[WhirledTraveller]

91 RON is approximately 87 R+M/2

Basically normal pump gas.
_________________
1977 Westy, Automatic. Big Valve heads, CS Cam.

[udidwht]

The VW manuals had slews of discrepancies over the years.

91 octane regular

_________________
1972 Westy Hardtop/Type-4 2056cc
96mm Biral AA P/C's~7.8:1CR
Headflow Masters New AMC 42x36mm heads w/Porsche swivel adjusters
71mm Stroke
73 Web Cam w/Web solids
Dual 40mm IDF Webers - LM-2 - 47.5 idles/125 mains/190 air corr./F11 tubes/28mm Vents - Float height 10.45mm/Drop 32mm
Bosch SVDA w/Pertronix module (7.5 initial 28 total @ 3400rpm)
Bosch W8CC plugs
Pertronix Flamethrower 40K coil
S&S 4-1 w/Walker QP 17862
3 rib 002 Trans
185R14 Hankook tires

[Abscate]

That 91 octane was the EU version, which is 87 in the US.
_________________
.ssS!

[chittychittybangbang]

I saw 85 octane somewhere in the Midwest about 8 years ago. My stock 1600 did not like it one bit!

_________________
If your into busses youve got issues and you likely don´t know it yet. - El_Güero

The question of whether the resulting usage is "correct" or "incorrect" depends on one's notion of correctness.

[udidwht]

[Wildthings]

I ran sub regular "Gulftane" in all my rigs for years. It was one of the first gasolines to go low lead and then no lead which meant that lead deposits and lead sludge became a thing of the past early on for me. People shied away from it because it was the cheapest gas out there and they bought the BS about the valve seats wearing if there was not lead in the gas.

[Abscate]

[Wildthings]