- Location
- New Jersey
what is everyone running for race gas just got my 701 ported and I was thinking about running Sunoco surge 105 leaded any thoughts?
race gas
- Thread starter Jcrack29
- Start date
- Location
- CA
Really depends what your compression is sitting at...
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Quinc
Buy a Superjet
- Location
- California
Type of riding and compression. Some guys are running ported engines with 220psi compression on pump gas. But they are only hitting full throttle for a second. Running higher octane then you need is going to make for poorer performance and waste of money.
- Location
- California
Leaded probably isn’t the best to be running in public waters. Yes I know, go hug a tree.
- Location
- New Jersey
200 psi surf riding
Quinc
Buy a Superjet
- Location
- California
Be fine unless you go full throttle for more then a couple seconds. Or to be safe you could run 50/50 mix with pump/race gas.
- Location
- Long Island
No point of running race gas in a motor if you are not tuned for it. Waste of money. And don't run leaded, just run some MS109..... leaded gss can eat parts. This goes for any motor in general honestly. I have built a lot of high performance cars in my years. This doesn't apply for some old classic cars, but I doubt anyone on here drives those lmao....
- Location
- California
Or aircraft, avgas is leaded.
- Location
- Long Island
I mean't more so like daily average motors that people use, I guess I should have clarified, unless we got some ballers on here with G5's hahahaha,
- Location
- the jetski grave yard
I don't know what rock you crawled out from under but lead in gas is about the best thing there ever was and its a shame its gone.
lead makes everything last longer and have more power. for starters its a lubricant.
and the need for race gas has nothing to do with the engine tune. race gas is higher octane than garbage gas, which means it burns slower, doesnt explode and create knocking like garbage gas and is needed for higher than normal compression pressures so that it doesnt detonate. tuned for race gas lol.
i guess if you crank the distributor or stator plate, opposite rotor rotation, which advances the timing, you are tuning for race gas. lol
AV gas is low lead. I remember the good old days buying the red 110, but now its only the blue 100. I run that in everything that uses "race gas"
Hahahaha, Leaded gas can eat parts?? Are you making the presumption that the lead in race gas eats parts?
Just curious if you have ever ran race gas in anything? I ask this because we burn 8-10 drums of leaded race fuel every year, year after year and engine and carb internals are pristine. However, ONE HALF TANK of MS 109 and the fuel pickups swelled so much they fell right off the fittings on several skis. Multiple different high quality fuel lines and same results. On our race quads, same thing, ONE TANK and it destroyed the shut off valves and contents of tank ran out in trailer. Just curious of your observations I guess. Lead in fuel is a lubricant, especially important in a watercraft engine that eats water for a living. Water is the opposite of a lubricant, water ingestion absolutely kills pistons skirts and cylinder walls. Give me some quality leaded race fuel and Castor 927 in a watercraft engine please! Combination is magic for reducing engine wear.
- Location
- Long Island
Leaded gas will destroy catalytic converters and damage sensors all day long. Sure a higher compression motor can benefit from it, but to run that super expensive gasoline and not have a tune for is a waste. This is in retrospective to the car world not jetskis. You want the most from a certain gas or fuel you tune for it. If you are spending that amount of money on race gas just for lower knock you are crazy in my opinion. The cost out ways the benefit and where were you running the ms109 from? I find it hard to believe ms109 would clog anything.
- Location
- Long Island
I guess I am speaking on one platform in retrospect. But to pay $100 dollars for 5 gallons of gas just isn’t worth it, thats quoting a price for C16 which contains lead obviously. Let’s say he bought a 55 gallon drum will run around $1000. The OP was basically running a stock motor with a little porting.
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- Location
- Long Island
Don’t race jetskis mainly run MS109? Or am I wrong?
- Location
- California
I think the main point here on a rec ski which most here run you don’t need to waste your money on high octane race fuel. Just use the minimum octane for your compression and you will be good to go. 180 psi is typically 91 octane safe. Now someone actually racing at the higher levels then yes.
- Location
- Long Island
Everything from 400whp up to 1100whp cars I perosnally owned. The 1100whp car ran on e85-e90 that I perosnally mixed down from 55 gallon drums of e98....the only thing that ever swelled up something was c85 because the O ring in the injector swelled up, then the motor pushed a head gasket. Literally few days later the injector company released a statement not compatible with c85, at the same extent there were other cars in my group that ran c85 with different injectors and were perfectly fine.
SpaceCowboy
breaking something
- Location
- Ypsilanti Michigan
Depends on what sanctioning body you are racing for. ISJBA requires MS109 because it doesn't have lead (safe for the environment and fish) MS109 is also very expensive compared to VP113, C112, or Q116. If you go to Waldo fuel in Wisconsin VP113 is 6-7 dollars a gallon.
Running race gas is awesome because the fuel has guaranteed properties and hasn't been sitting in some tank forever. Also if you go to a gas station where all 3 fuels go to one nozzle and you select anything but 87...well you're getting 1/4 gallon min of whatever the last customer purchased (most likely 87).
Race gas on a 701 really depends on supporting mods. If you're not messing with ignition and running come good compression I wouldn't waste my money on a super high octane fuel but they make race gas in mid 90's octane levels which would be appropriate.
Half flip95
Formerly pondracer95
- Location
- Lake Havasu City AZ
the leaded blue AV 100 is good. 50/50 with 91 and I can run WFO all day long turning 7500+ 190lbs
through multiple seasons everything looks good in the carbs, plugs, internals
one week of running Sunoco 110 turned the plugs, pistons, tops, and carbs nasty yellow colors
through multiple seasons everything looks good in the carbs, plugs, internals
one week of running Sunoco 110 turned the plugs, pistons, tops, and carbs nasty yellow colors
- Location
- California
The other good thing about avgas is it has a much longer shelf life than the newer pump gas that starts to go bad really quickly.