I don't really know much about motors and all that jazz, but how hard would it be to get 350 hp while staying NA?
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Sent from my iPhone using Autoguide
NA horse power
FORDY9ER
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High compression causes heat. Boost causes heat. Heat causes detonation. Detonation breaks rods and pistons, even forged ones. To prevent detonation you have to run a much higher octane fuel like E85, avation fuel or race gas.
On the other hand, high compression likes nitrous (to a point). Nitrous has a cooling effect on the incoming air reducing heat.
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It is unlikely you will hit 350 rwhp natually aspirated if you don't. Most of the high horsepower n/a motors are running 12.5:1 compression ratio. Some 13.8:1. I've heard of one 14.1:1 motor. There was one that was reported breaking 350 with 11.5:1. That is the lowest I've ever heard of. There really isn't a precise cutoff point. A lot of times you can retard the timing to run 93 octane fuel. But, then you loose horsepower.
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just try doing, TFS 38cc heads to bump up compression slightly, to almost 10:1 (its closer to 9.7:1) and with some nice stage 2 cams and the rest of the bolt ons you should see 330-350ish HP na...
refer to the video i posted on the 1st page, he hit 340 NA... WITHOUT upgrading his rotating assembly
agree'd, but then he'd have to get new pistons to bump compression, which in reality for 350hp NA isnt "needed" just helps get there faster
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Cheaper to get a supercharger than to build 350hp NA.
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Aviator Motor, Comp 106100 cams, Full exhaust, Ported short runner intake....350-360rwhp all day.
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we established that thanks :facepalm:
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350 is not that hard. It's the next 50 that gets expensive and quick. 
. My car put down 399 yesterday on 2 year old 93 octane. With a few changes and some fresh fuel it should easily surpass 400.
. My car put down 399 yesterday on 2 year old 93 octane. With a few changes and some fresh fuel it should easily surpass 400.
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unless you do the next 50 with N20 :naughty:350 is not that hard. It's the next 50 that gets expensive and quick.
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I thought you were running 11.5:1+ compression ratio? Also, others with slightly higher compression and running E85 fuel have had trouble reaching your numbers. I don't really know but your extra headwork and type of cams might be making the difference.350 is not that hard. It's the next 50 that gets expensive and quick.
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haha yeah he has 11.5:1 compression and like stage 5 or 6 cams with TFS heads and 150# dual springs... he also has a forged rotating assembly with I beam rods
350 with stock rotating assembly is VERY doable... anything more and you're going to have to change your pistons for higher compression.
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I suppose its possible. I just haven't read about anyone who has actually done it. Most end up with around 320 rwhp.
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His intake as well as aggressive cams are the reason why he has a higher peak than most, he's sacrificing some bottom end to get there (take the average of his horsepower and torque and it comes out to 364 versus a more balanced setup like mine). Regardless, still very impressive on 93 octane, just cant wait to actually take full advantage of the timing on e85... only running 19* currently.
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look at the video post i made on the first page
2v stock rotating assembly 340HP; TFS heads (with no porting done), and comp cams (which i think if he did a better cam he'd have hit higher numbers)!
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