What fuel do you use for your Mopar?

[Richard Cranium]

 

[maxwedgechar]

With 13 1/2 compression Max gets VP or CAM-2 110

 

[threewood]

I found a station that sells 88 octane clear gas that I have been running without issue. 10.2:1 compression, .039 compression height, Hughes STL3842 cam, Stealth ported heads, 22°/37° timing.

 

[Unkle Krusty]

The cheap stuff. But not the 85 octane. Usually the 87. 318 77, in a camper van. 65,000 miles. Just took it apart. All is good. Some minor pitting on the exhaust valves, which were white. Putting in new cam and gear, four barrel carb. Back together before the end of March. Will be travelling down tne left coast of US. Had 160 pounds of pressure, each cylinder, so not very high compression. The 85 octane got lower fuel mileage, and the performance was off. We are short on giddy up with the stock set up, due to 6600 pounds weigh in.

We had this panic years ago with the bike engines. All the old stuff is running fine on the 87. The CB450 had hard valve seats before the lead was removed. Honda was ahead of the curve. All my old RR friends were running the 87 gas.
You guys seem to have a bit more plugging of jets, than we do in Canada. However in BC our gas is refined at Cherry Point in WA

 

[KiwiKid72]

New Zealand petrol uses the Research Octane Number (RON) to rate the octane value of the fuel.

We have 91, 96, 98 and the odd station that sells 100. The Plymouth drinks 96. It doesn't run as well on 98, and I never use 91 for fear of pre-ignition.

91 octane = US 87
96 octane = US 91 (US$5.60 gallon)
98 octane = US 93

 

[cosgig]

It will run on pump premium, but there's detonation if I push it too hard. The GTX really likes 50/50 mix of non-oxy premium and SONOCO 110, especially if the air is good...
View attachment 1480209

That’s my exact recipe. 50/50 with 93 “Rec” fuel, no ethanol, and 110 racing fuel. I don’t care about the price, I’m not driving it to work, I just want to beat the pavement and have fun with it. I’ll burn down my truck daily with the cheap stuff.

 

[torredcuda]

93 octane pump gas, unfortunately all we have available here in NH is 10% ethanol except for a very few stations, race or AV gas.

 

[cosgig]

93 octane pump gas, unfortunately all we have available here in NH is 10% ethanol except for a very few stations, race or AV gas.

They just built a big new station right at the corner by my house. They have 16 pumps, with rec fuel, 110, diesel, and all the regular gas. It’s a blessing because I was driving to the next town over to get 110, now it’s about 500 yards away!

 

[dadsbee]

 

[Sixpactogo]

I run pump premium 91 octane with no ethanol in everything with a carburetor from the weed whacker and lawn mowers on up. The newer vehicles with Fuel injection can tolerate the dog piss spiked with the corn juice.

 

[1STMP]

If you have hardened valve seats, you could use the cheap swill.

The cheap swill loves to eat rubber
o-rings, seals in older carbs, and
fuel pump diaphrams. It"s also
detrimental to steel gas tanks and
aluminum carb bodies if allowed to
sit for long periods.

 

[1967coronet]

My old 67 has the low compression motor home 440. I run regular 87 octane the non ethanol variety. No detonation.

 

[Triplegreen500]

The '70 Charger (bone stock 318 2v) gets pump 87. Runs fine, no ping, no smoke, no stumble.

Wrangler 4.0 has a usual diet of pump 87, but sometimes pings so it'll get an occasional tank of 89 or 93, depending on $, with a shot of cleaner additive until I can pull and clean the injectors and check coils and the (non-timing-adjustable) cam position sensor.

Anything gas/turbo (I have a few of the old 2.2/2.5 turbos still buzzing around) gets 89 or 93 pump, depending where I have the boost set and how hot it is out.

All the motorcycles get 93. Air cooled, high compression, and one liquid cooled high compression (1125cc, 162rwhp).

Diesels just get pump diesel. I'll run a bio blend in the Cummins once in a while, it really doesn't care (2001 pre-emissions). If prices are REALLY stupid, and I have to drive the Cummins...it might get a few sips of off-road here and there. Maybe.

Yard appliances (mower, snowblower, chainsaw) get pump 87. Chainsaw gets 2smoke additive.

EVERYTHING gets SeaFoam added if it's sitting for more than a couple weeks, as well as a NoCo battery tender lead. Go to station, add SeaFoam, fill tank, drive home, plug in. That gets it all through the system, and everything fires right up when I need it. Snowblower, first start of the season? 3 hits on the prime bubble, pull the cord, starts first pull.

 

[Armyvet25]

Can't get ethanol-free around my way so i use 93 with "Stabile" Marine additive. My car is 9.8 to 1 , I'm sure i'd be ok with even 91

I use the same 93 eth fuel, I've talked to many Chrysler engine builders over the years, and they all stated they've never seen an issue with the valves etc using today's fuel, said the older Chrysler engines were built just that much better. I still will start using the eth free due to rubber parts still have an issue, I always run the fuel out of carb since I use a Holley electric fuel pump for peace of mind. And the Marine stabil is the only stabil I'll use if needed, good stuff!!

 

[icetech]

87 octane... 9.4:1 318 with trickflows, i haven't noticed any issue yet.

P.S. with fuel costs i honestly will probably keep my stroker build with a low enough compression for cheap gas, since it's just a beater i am not worried bout squeezing out every HP (if i ever get around to building it)

 

[68BabyBlue]

I use the same 93 eth fuel, I've talked to many Chrysler engine builders over the years, and they all stated they've never seen an issue with the valves etc using today's fuel, said the older Chrysler engines were built just that much better. I still will start using the eth free due to rubber parts still have an issue, I always run the fuel out of carb since I use a Holley electric fuel pump for peace of mind. And the Marine stabil is the only stabil I'll use if needed, good stuff!!

I ran the same stuff in Baby Blue the second time I owned the car, and also used stabil. Holley electric fuel pump as well, installed in the 70s. Car still had the original valves and seats when I sold it with 119,000 miles, engine never apart, no problems with rubber stuff. Car ran Amoco lead free 93 in the 80s.

 

[khryslerkid]

In my 440, 9.3:1, 452 heads, I can run almost anything. During the summer I'll run 93 10% with Staybil 360 additive. Winter storage I'll use 89 non ethanol.

I use the orange accelerator pump in the Eldebrock and rubber fuel lines are ethanol approved.

 

[Scott Engelhardt]

My 440 was built for driving. I can run 87, but I use 91 if I can.

 

[EWJ]

Primarily Sunoco 93/94 or BP 93. I've got a few pails of Sunoco 110 and others with AV 100LL which I'll splash some in at times - for the octane and fuel stabilizers: like 2-3 gallons to a tank every other fill up or so.

It's not common to find any non-ethanol offerings at local stations here in northern NJ.