fuel

[redsnapper386]

guys i have a 1993 2.5 v6 fishing motor i recently installed cc reeds shaved heads .010 question is should i run ethanol 91 octane with startron or would it be safe to run 87 reg ethanol free.not sure with the increase of compression.thanks in advance.

[patchesII]

You need to know what your compression is

[redsnapper386]

You need to know what your compression is

before work 119 all cylinders now 130 lbs.taken cold

[big tom]

I always thought merc tuned/set up there stock motors for 89 octane. At least a lot of big block I/O's I have owed came with 89 min octane stickers on them. Not sure if that's true with o/b's. I would think you, as I would run at least rec fuel (90) or ethanol free premium. If you ran ethanol free gas you would save money, you wouldn't need the startron.

[XstreamVking]

93 super, skip the star-tron crap. I have 135 #'s and run shell 93, at 25 deg timing and no prob for many years. 98, 200 merc EFI jm2cts.

[redsnapper386]

i agree but one of my gas stations told me the etho free was 87 oct,also our etho here in fl is more per gallon by .30 cents and some times as much .56 cents.guess i will stick with the corn stuff and deal with the etho problems my tank is 142 gallons and i keep it run out before lay up.thanks for input.

[redsnapper386]

thanks extremevking my timing is at 23 deg no idle black box.

[XstreamVking]

My boxes are pulled and I am running 40-1 pennzsoil xlf blend. 23 deg is just as good imo....

[johnboy 88 vegas]

My last modded 2.5 fishing motor I build had 155 lbs of compression and I ran on normal 93 pump gas since no one had anything over 89 octane for marine fuel here. I had it on a 20' Vegas v-hull. It had 2.0 liter heads with .75 head gaskets, 7 petal reeds from a 260, 91 model fishing front half, 96 fishing model block, and exaust cut like a drag motor. Ran like a raped ape with no detonation problems...surprisingly. I checked plugs on a wot run and kill once a month until the motor drug #3 piston a year and a half later....thats why you should run t-stats instead of washers in a steel bore motor.