What Octane? Reply #75 – January 01, 2012, 04:37:56 PM Most engine builders I do know don't use a dyno for anything, except for top power, find everything the engine caan get out of them. I guess there all idiots too for telling people what octane to try, and what compression their engine is. Or the people getting their engines built what octane they want to hit.The only correct answer is what your engine will tollerate. Period. There are lots of bullshiznit computer calculations and smoke and mirrors to hide behind, but until its running, you don't even know where to start. As a matter of fact, every dyno rates hp differently, and depends heavily on the person running it. You can make any motor look good. You can see that in every mustang magizine. Quote Selected
What Octane? Reply #77 – January 01, 2012, 08:21:49 PM Quote from: TOM Renzo;376651so much to choose from all i know is that the the higher the octane, the odds are against my motor being capable of putting up with it for long periods of time.Why ???? Can you explain this to ME!!!!! What would be the issue???? So you are saying your engine will expload with a higher octane on a regular diet. I find this extremely odd and would like to know why?????To put it in perspective. Toyota recommends regular 87 in the camry V6. But in the lexus with the same exact engine and tune they recommend premium 91. Can anyone explain this to ME?????? Quote Selected
What Octane? Reply #78 – January 01, 2012, 08:59:21 PM The reasons why running more octane than you need to is a bad idea have been clearly explained to you numerous times in this thread Tom. Those reasons don't mesh with the opines you've shared in this thread, because your opines on the effect octane has on engines are totally wrong. You apparently lack the self esteem to admit when you're wrong, or are one of those guys who will never see the light, even if there's tons of evidence to prove you're wrong about something. You were rude as hell to Haystack for what he said earlier in this thread about emissions components and their effect on engines, but that was AFTER you made totally screwed up statements about octane's effect on engines yourself. Anyone who REALLY knows as much as you claim to know about cars would know the truth of this matter. Also; common sense should tell you that most people don't want to spend the extra money on a higher grade fuel than their vehicle requires. Quote Selected
What Octane? Reply #80 – January 01, 2012, 11:12:11 PM Tom, it is understandable if you feel the need to dyno those. I would too. Our cars are not nearly as costly. The power levels that we are working with, we can discover and repair detonation way before it causes major damage. Not saying your ideas are wrong. Just saying they are overkill for what most of us do..........just like if we put that first engine in one of are cats or birds. Local law enforcement would have a field day! Quote Selected
What Octane? Reply #84 – January 01, 2012, 11:54:34 PM Quote from: TOM Renzo;376788Chrome an engine is an engine they are all air pumps!!!!! Once again hope i got you thinking about sweep compression and how it effects compression pressures. I seem to think i taught you something and that is good. That is why i post on sites. Remember an engine is an air pump. And as they get older and build some deposits they can require higher octane. Also engineers are so worried about detonation in modern engines the y monitor and adjust it with the Knock sensor and the O2 . If i made a difference how you thimk or if you learned something i am happy. That is why i post. Thank youI have been told engines are nothing but air pumps half my life. We just need enough air pump to move a car, not a planet. lol I will look more into sweep compression. Never covered in school, and I have never seen anything about it in books or magazines. I plan on looking into it more. I have always wondered about dual pattern cams and what they were supposed to accomplish. Cams are the most hard to understand part of an engine........funny since they are just one piece of metal, and only have the purpose of opening valves. Quote Selected
What Octane? Reply #85 – January 02, 2012, 12:05:02 AM Quote from: TOM Renzo;376791This was my first post and sums it up pretty correctly i would think Guess what his reply to that should have been. GT40p heads, and intake. and a E cam with fly-cut pistons. That is the most popular configuration in this forum, and what I will most likely do to my bird. I think he wanted to see what octane is being used with this configuration. As a side question, have you dynoed this config? What is the most probable HP for this set up? Quote Selected
What Octane? Reply #87 – January 02, 2012, 03:04:56 AM I swapped the the headlight on a mazerati, as a matter of fact, I was paid to do it. Doesn't sound impressive when I tell you I was the shop gopher, and noone else had long enough arms. I guess it took them 5 or 6 hours the first time, taking off basically the whole front end.I've also worked on a 28 studebaker police car, model t rat rod, some kind of ferarri, and a w12 bentley. Even a 4 seater 2.3 turbo sand rail with an eslinger head and big turbo. So what was in this 328rwhp 347? Which head transmission ect? And 1/4 miles times? 328 at the wheels sounds like a good number, but as I said earlier, the dyno results are only as good as the person running them. Quote Selected
What Octane? Reply #89 – January 02, 2012, 09:57:16 AM Sure is a lot of fancy stuff to just show exprieance. A car is a car. Simply put, this has gone way too far. The thread posted a simple question "What octane do you use?", not "What octane should be used?" Quote Selected
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