What kind of gasoline (and additives) do you put in your Spider? - Page 2 - Alfa Romeo Bulletin Board & Forums
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post #16 of 28 (permalink) Old 09-09-2019, 07:01 AM
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I just looked in my '79 owner's manual (USA Spec): 91 RON or 87 Pump Octane Rating is specified.

In my '70 Super (carbureted), I find that the car runs better and I get better fuel economy using Premium, but the car does not knock when using regular.

I have been using 10% EtOH gasoline without problems in both cars, but rubber bits in the fuel system are all new in both.

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post #17 of 28 (permalink) Old 09-09-2019, 07:50 AM Thread Starter
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Quote:
Originally Posted by Mario Romagnoli View Post
I just looked in my '79 owner's manual (USA Spec): 91 RON or 87 Pump Octane Rating is specified.

In my '70 Super (carbureted), I find that the car runs better and I get=t better fuel economy using Premium, but the car does not knoch when using regular.

I have been using 10% EtOH gasoline without problems in both cars, but rubber bits in the fuel system are all new in both.
My manual does as well and I've had similar experience. Filled it with about 1/3 (because I was getting low) 87 octane and had no knocking, but have been using premium since. I'm going to try ethanol-free because I have access to it and it seems to only be helpful.

Plus, more than a few of my lines are still original. Still planning on replacing them with silicone... might be a good early winter project?

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* 1986 Spider Veloce *
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post #18 of 28 (permalink) Old 09-09-2019, 08:29 AM
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I run 91 pump gas with Marvel Mystery oil at 4oz./10 gallons. I also run 8oz of Boostane, octane booster per tank...not for performance reasons but to oxygenate the fuel for cleaner combustion. IMHO it keeps valves, pistons and rings cleaner longer.

1967 Duetto just like the one I had in college....a long time ago.
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post #19 of 28 (permalink) Old 09-09-2019, 08:35 AM
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I run non-ethanol premium and add a gallon of race gas every 1/2 tank full. I never have problems running factory advance numbers (40 BTDC) in a 66 Duetto 1600.

Tony Campitelli
66 Duetto, 66 Austin Cooper S
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post #20 of 28 (permalink) Old 09-09-2019, 09:58 AM
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I have the Squadra chip installed and use 91 octane. I've read that some have had detonation problems with the chip but I've had no trouble at all. The elevation is well over 5000 feet in my area and I've been told that can ease problems with pinging.

I've added some octane booster on occasion but can't say it made a difference.

Bill

1991 S4 Spider "Gabriela", 2017 VW Golf R, 2018 VW GTI,

Previous obsessions; 2006 Mustang GT, 2006 BMW Z4M, 5 other Bimmers, Capri V6, Renault 5, Lotus Cortina, Sunbeam Alpine, Ducati Diana Mk 3, Norton Commando
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post #21 of 28 (permalink) Old 09-09-2019, 11:04 AM
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Originally Posted by Jack Straw View Post
The elevation is well over 5000 feet in my area and I've been told that can ease problems with pinging.
It does exactly that. Less oxygen = less chance of pre-detonation. The lower air pressure effectively lowers the compression ratio. 91 is the highest ordinarily available (unless you go looking for race gas) in Colorado and "regular" is just 85 for this reason. If I had a Squadra chip (I have no idea why I don't - just need to pull the trigger) I'd add an octane booster before driving to a lower altitude and fill up with 93 when I got there. Will I ever drive to a lower altitude? Not likely.

Chris

1990 Spider Veloce
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post #22 of 28 (permalink) Old 09-09-2019, 08:51 PM
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Lucas Ethanol Fuel Conditioner is what i have seen used at the alfa shop i go to....i use it with every tank fill....i also use marvels mystery oil...a bit in the tank, and in the oil
(make sure you put some marvels and fresh oil thru the top logic section of the spica pump)

https://www.alfabb.com/bb/forums/car...pica-pump.html

i think the lucas product is the best out there....hopefully neutralizes etoh in the gas....

https://www.amazon.com/Lucas-Oil-106...gateway&sr=8-7

1969 spider

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post #23 of 28 (permalink) Old 09-10-2019, 03:02 PM
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Hi all

I just put 98 octane in my Alfas since Unleaded Fuel was introduced in 1986 in Australia.
Never had any Problems with my cars or Customers cars.
No additives required.
Some use 95 octane with no problems also,but I prefer 98 from reputable places like BP,,,Shell and Caltex.

Depends on what week the price is= from $1.40 a litre to $1.90 a Litre

Funny thing about our toys (Alfas)
If my car needs a Drink,,it gets a drink,,
Price is never a factor.
A drink= fuel,,petrol.gas,,whatever your country calls it.
We call it Petrol
Can not imagine my cars using 91 with additives.

1972 105 GT Veloce 2000
1976 2L Spider
1984 GTV 6 3 litre
1967 GSGT 2 litre
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post #24 of 28 (permalink) Old 09-10-2019, 03:56 PM
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The octane you use should be directly proportionate to your compression ratio. Using higher octane when your car is not designed for it is just throwing money away. Higher octane does not mean better fuel, just different burn characteristics.
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post #25 of 28 (permalink) Old 09-10-2019, 05:54 PM
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Shell premium, 93 octane. Before storing at the end of the season StaBil.

1991 Spider Veloce
1977 Rolls-Royce Silver Wraith II
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post #26 of 28 (permalink) Old 09-10-2019, 06:49 PM
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Quote:
Originally Posted by giulia_veloce View Post
Hi all

I just put 98 octane in my Alfas since Unleaded Fuel was introduced in 1986 in Australia.
Never had any Problems with my cars or Customers cars.
No additives required.
Some use 95 octane with no problems also,but I prefer 98 from reputable places like BP,,,Shell and Caltex.

Depends on what week the price is= from $1.40 a litre to $1.90 a Litre

Funny thing about our toys (Alfas)
If my car needs a Drink,,it gets a drink,,
Price is never a factor.
A drink= fuel,,petrol.gas,,whatever your country calls it.
We call it Petrol
Can not imagine my cars using 91 with additives.
Well, we use a different scale than you do....I can't speak intelligently about it but our 93 octane here in the US is equivalent to about 98 octane when you're living upside down.

Y'all use RON, we use (R+M)/2: https://en.wikipedia.org/wiki/Octane...,_MON,_and_AKI

The couple of us that have mentioned 91 octane (about 95 in OZ) live at high altitude (above 1500 meters) where you don't need as high an octane number to get the same results - I live at 1900 meters and never drive my Alfa significantly below 1 mile in altitude. I do commonly drive above 3000 meters though.....

Chris

1990 Spider Veloce

Last edited by GV27; 09-10-2019 at 06:57 PM.
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post #27 of 28 (permalink) Old 09-10-2019, 09:04 PM
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Premium fuel always and Seafoam gas treatment every other tank fill up.
I have weber carbs. Do the same with my Ferrari.

Richard

1969 1750 Spider Veloce USA AR1480672 Engine 00551 01163 Red / Black - work in progress
1978 Ferrari 308 GTS #26355 Red/Tan FCA Platinum Winner Pacific Region

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post #28 of 28 (permalink) Old 09-11-2019, 12:21 AM
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Don't agree with using fuel additives. The best thing you can do for your engine is use it, and give it frequent Italian tuneups ... IMO. That keeps it clean
Pete

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