Add in some serious head porting and larger valves as well...On a side note whats with all of these people wanting to stay na, AND get power? Do you guys actually think it is cheaper to build an n/a motor? If you do...dollar for dollar, hp for hp turbo can't be beat.
I think he wants the reliability of NA and less parts to worry about. Boost can't be beat, but at the same time, worrying about, ic pipes blowing off, oil leaks to the turbo, Oil pressure to the turbo. waste gate integrity, manifold leaks and other sources of boost leak etc. it gets tiring.
once you iron out a na car, you literally have nothin to worry about besides over ehating and detonation.
is this 200hp flywheel or ground? the ka24de makes 150-155bhp as is. 200 is alot to gain, but it is possible. Head work being most important (cams, port and polish, valve jobs, cam gears) then there is ecu to make sure the correct fuel and ignition maps are set. this is very important. without the ecu upgrade there is litle chance of reliability defeating the purpose of staying na. and ofcourse your regular intake, oversized headers and 2.5-3" exhaust like a built sr20. all this has basically been said already so I am just reiterating the points. GOOD LUCK. I'd love to see this come to fruition. I doubt you'll be beating any k20's but you will get their atention.
dont get me wrong, i know turbo is the best, but i just want to take what nissan already has and give it some help, ka's have hella torque(for a 4 cylinder), and going na in the right way will keep the cars factory(slightly modified) appearance while givin many cars a good run for their money, throw a good lsd out back or possibly even posi and you have one hell of a drift monster, not as much power as a turbo but there isnt the lag either, its right there all the time, i love turbo's and the maintenance wouldnt bother me(and i would love to hear the whine and whoosh from under the hood but i can seem to find any decent deals for my 240, i built a complete turbo kit minus tuning for my zc swapped civic and didnt even have $500 in it, the headers/downpipe are the main things im havin trouble with right now, and ic piping, i cant figure out where to run the piping without having to move my battery and shit, hell any help building a turbo kit would be nice too(by the way i have a garret t25 from eclipse)
Done a fair bit with engines here in Australia and irrespective of what engine you have there are well established modifications you can do to pick up quite a few "na" horsepower.
For example the humble sump can be modified to keep the envelope of oil that lurks on your crank in the bottom of the sump where it belongs, not in a spinning glob wrapped around the crank.
Think of that oil weight.
For every quart of oil you can keep off the crank at 5000rpm, its worth around 5hp on average.
Keep 2.5 quarts off the crank theres an extra 12.5hp at 5000rpm+.
If you start off with 100hp thats a fat old gain.
Anti reversion exhaust, a decent port job with a manifold match, quality balance for the rev range your engine will see, remap..... see, not many new parts just refining what you have.
Ive been at this for over 25 years and there are no power secrets believe me, just sound engineering principles that apply to your engine right through to Formula 1.
They had fuel injected V8s and roller cams in 1908 in French aviation engines, nitrous and blowers on fighters in WW11 and desmodromic valve trains have been around for near 50 years.
Materials change as does technology, but the principles dont.
All you gotta do is find someone who actually knows those principles and can apply them to your motor.
Do up what you have, check out the extra performance, then maybe think about whacking a hairdryer on it when you crave more grunt.
Plus youll have a well prepared engine for the turbo.
Add in some serious head porting and larger valves as well...On a side note whats with all of these people wanting to stay na, AND get power? Do you guys actually think it is cheaper to build an n/a motor? If you do...dollar for dollar, hp for hp turbo can't be beat.
Gee mate
You CAN get hp out of NA.................go ask the formula 1 blokes.
On a less sophisticated level good (broad) power levels can be achieved.
Thats only like roughly 2 hp per cubic inch which is a peice of wee wee.
I built Nissan engines for years that knocked out 2.25 to 2.5 hp per cube (at the flywheel not the bull back wheel rating) for rally and circuit work on petro fuel!
Too many of you forget there are no performance secrets, just sound, well established engineering fundamentals that have existed since the early 1900.
Look up the 350 cu inch La Antionette aviation motor from 1908.
OHC fuel injected 350 cu inch, 350 hp V8.
Oh yes its been around a long time ...............high performance.
You guys read too many magazines and hang on every word of what some mega buck engine builder has to say, instead of reading engineering texts and finding out the truth for yourselves, and having the satisfaction of making your own giant killer without spending moocho dollars.
Go read the High Speed Internal Combustion Engine by Sir Harry Richardo and stop wasting money on computer clickers and make your own power or at least be able to tell when some onanist (look it up in the dictionary) is telling you less than reality.
Old Gazza :-)
PS Computers are a great tools today, but so are some of the people operating them.
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