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.