YACT: Anybody have a 5.7L Vortec motor? Quick question
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I don't have an owner's manual. For that matter, I don't even have a vehicle that came from the factory with that motor. How about you don't ASSume things?
Drakkon
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- Aug 14, 2001
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my dad has one...uses 89 in it for going around town...but if hes actually using the motor pulling stuff puts 91 in it...so in other words I think that since its such a big engine would be best to go with a higher octane just cause your making some big explosions and u want em to be clean as possible 
Octane has nothing to do with fuel purity (aside from the base components octane and heptane).Originally posted by: Drakkon
my dad has one...uses 89 in it for going around town...but if hes actually using the motor pulling stuff puts 91 in it...so in other words I think that since its such a big engine would be best to go with a higher octane just cause your making some big explosions and u want em to be clean as possible
Drakkon
Diamond Member
- Aug 14, 2001
- 8,401
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Oops i guess clean wasn't the right word to use there...i just always think of it as a cleaner stroke you get from the higher octans since that ol compression ratio is higher...I guess what i should have said is that if your pulling or going uphill its nicer for it to have the higher octane so the engine is being used to its full potential and not being strained. I'm not sure what all goes into it...dads gone with instinct when it comes to gas and imparted that knowledge on to me
Its hard to say though how much it truely helps...i notice a difference when i go from 87 to 89 in my car for going uphill - phoenix to flag...like a 5000 ft jump in elevation over 150 miles...get about 2-3 miles per gallon better on 89 than 87 and it just seems to handle better - but anyways it doesn't necessarily hurt to try different combinations...just waste a few $$ while finding out
I dunno all the ins and outs but better info here: http://www.howstuffworks.com/question90.htm
Originally posted by: Drakkon
Oops i guess clean wasn't the right word to use there...i just always think of it as a cleaner stroke you get from the higher octans since that ol compression ratio is higher...I guess what i should have said is that if your pulling or going uphill its nicer for it to have the higher octane so the engine is being used to its full potential and not being strained. I'm not sure what all goes into it...dads gone with instinct when it comes to gas and imparted that knowledge on to me
Its hard to say though how much it truely helps...i notice a difference when i go from 87 to 89 in my car for going uphill - phoenix to flag...like a 5000 ft jump in elevation over 150 miles...get about 2-3 miles per gallon better on 89 than 87 and it just seems to handle better - but anyways it doesn't necessarily hurt to try different combinations...just waste a few $$ while finding out
I dunno all the ins and outs but better info here: http://www.howstuffworks.com/question90.htm
Octane you are supposed to use depends on compression.
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