#1
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ilmor 7.4L
Anyone run this engine with 87 octane? According to ilmor it is rated for 87 but I've heard from other sources that I should run high test.. The closest marina to me (literally 5 minute idle) only has 100% gas 87.... there is a marina (15 minute boat ride) away that does have high test... I'm just wondering if it's worth the extra drive and cost of high test to run that grade in the boat.
Bottom line I'm looking for people that have real world comparisons in running both grades in the ilmor 7.4 power plant. |
#2
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87 is fine. Use quality fuel as much as possible
Shell/Chevron/Texaco
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2015 X20 SS GEN2 6.0 2016 G21 Coastal 2014 X46 GEN2 7.4 2014 X30 GEN2 5.7 2006 VRS200 SS 5.7 2013 X30 GEN2 6.2 2013 Yamaha 242LS |
#3
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Run 87 anytime I can in my 7.4 - If it's good enough for the Ilmor engineers, it's good enough for me.
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2013 X-Star - 7.4 Ilmor |
#4
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I run ethanol free 87 oct. in mine about 90% of the time. I haven't noticed any difference when running 93 octane.
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#5
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I only buy premium gas. Not because of the octane, but because in MO most fuel is ethanol based, but some gas stations sell premium (91 - 93 octane) that is ethanol free.
Is anyone else afraid of ethanol? I am afraid it will pull moisture into the fuel system and cause more expensive repairs than I am paying for the higher priced gas. If it matters I have a 2015 with 6.2L |
#6
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Quote:
Boats can sit for weeks and it leads to phase separation. If you have too, i add some marine stabil to counter act it. But eth blended fuels are no good for items that sit more than 30 days. |
#7
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I was reading (and I can't recall where) and my dealer also recommends just the regular 87 for all the new MC ilmore engines. I used to use only Non-Ethanol fuel previously in my higher strung engines (ie Yamaha jet skiis) but for right now I'm using regular 87 with Marine Stabil.
all my lawn equipment runs Non-ethanol, but it's older and just not built for it. |
#8
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Quote:
If that tells you anything |
#9
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Quote:
"Poor-quality or old fuels can cause problems such as loss of performance, rough idling, hard starting and hesitation. If the engine experiences any of these symptoms, first try another brand of gasoline and/or replace the old gasoline with fresh gasoline." I have the 6.2L in my truck and GM recommends 93 and states that 87 octane may reduce engine performance. |
#10
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I will use ONLY non ethanol. Had issues earlier. Even though It's only a 5.7
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