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Old 04-11-2013, 09:02 AM
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87 pure gas or higher octane 10% ethanol?

LT-1 motor what would be better to use
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Old 04-11-2013, 09:08 AM
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I'd go higher octane and treat it for the ethanol. Your LT1 is set up for a higher octane and you will sacrifice a bit of performance going lower. The only noticeable problem I have had with ethanol in my boat is that it tends to gum up the antisiphon valve if I don't run the boat regularly and don't treat the fuel during the season. My hoses and other components don't seem worse for the wear. Plastic gas tank on my boat. So no worries there.
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Old 04-11-2013, 09:46 PM
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Your LT-1 owners manual states minimum 89 octane, my corvette buddies say at least 91 octane rating for moderate to hard driving (like how our boats are driven) and 89 octane in an emergency, regardless of ethanol content, never run 87 octane and drive it hard or it will detonate to death. Of course other MC LT-1 owners might chime in with their experiences...
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Last edited by j.mccreight@hotmail.com; 04-12-2013 at 12:04 AM.
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Old 04-12-2013, 04:12 PM
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Good Question.

I dont have an LT1 - just a regular 350 in my 95' 205. I've been using 87 octane the past few years.

East - what do you treat your fuel with during the season?
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Old 04-12-2013, 04:20 PM
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Quote:
Originally Posted by JDJ_205 View Post
Good Question.

I dont have an LT1 - just a regular 350 in my 95' 205. I've been using 87 octane the past few years.

East - what do you treat your fuel with during the season?
I have the same motor. I usually run premium because my can sit for weeks and fuel loses octane rating over time.

95 manual calls for minimum 89 octane - http://www.mastercraft.com/files/man...roSport205.pdf

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Old 04-12-2013, 04:42 PM
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Quote:
Originally Posted by j.mccreight@hotmail.com View Post
Your LT-1 owners manual states minimum 89 octane, my corvette buddies say at least 91 octane rating for moderate to hard driving (like how our boats are driven) and 89 octane in an emergency, regardless of ethanol content, never run 87 octane and drive it hard or it will detonate to death. Of course other MC LT-1 owners might chime in with their experiences...
Not that I would recommend using low octane fuel, but doesn't the LT-1 have a knock sensor to retard the timing when experiencing detonation or pre-ignition to prevent damage? Of course the lack of performance with retarded timing wouldn't be any fun either. This coming from a Ford guy with a 1977 boat.
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Old 04-12-2013, 05:02 PM
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Quote:
Originally Posted by thatsmrmastercraft View Post
Not that I would recommend using low octane fuel, but doesn't the LT-1 have a knock sensor to retard the timing when experiencing detonation or pre-ignition to prevent damage? Of course the lack of performance with retarded timing wouldn't be any fun either. This coming from a Ford guy with a 1977 boat.
Yes, our 94 LT1 does have a knock sensor.

Not sure what gas the PO used (still about 1/4 of tank from PO last fall).

I am going to drain the tank and use for the lawn mower and fill up with 91 for the first tank and then switch to 89 going forward.

Only gas we use in our trucks (87 octane) or boats (89 octane) is Shell, BP and occassionally Speedway. Speedway, believe it or not does have good gas. We have never had any issues with them.
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Old 04-12-2013, 05:06 PM
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Quote:
Originally Posted by thatsmrmastercraft View Post
Not that I would recommend using low octane fuel, but doesn't the LT-1 have a knock sensor to retard the timing when experiencing detonation or pre-ignition to prevent damage? Of course the lack of performance with retarded timing wouldn't be any fun either. This coming from a Ford guy with a 1977 boat.
The ecm is only able to retard the timing a couple of degrees, it will throw a mil beyond 5 degrees, continually using low octane with hard driving it will ping. Also fuel loses octane over time so add that to the equation.

Of course you already knew this
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Old 04-12-2013, 09:22 PM
supreme112279 supreme112279 is offline
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The lt1 being a high performance engine, it like higher octain gas. IT would problally run just fine on 87 but 89/90 would be better and 93 would be best. ethanol is ok if you use your MC often but I hate it. I personally run 93 non ethanol. on the knock sensor, Im not convinced it really works. My camero doesent run any different with it unpluged.
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Old 04-13-2013, 11:29 PM
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Quote:
Originally Posted by mikeg205 View Post
I have the same motor. I usually run premium because my can sit for weeks and fuel loses octane rating over time.

95 manual calls for minimum 89 octane - http://www.mastercraft.com/files/man...roSport205.pdf

Seafoam and/or Marine Stabil.
Thanks MikeG!
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