Well, the MEP equation I stated is rough. I use redline, but you can also use the RPM at which point peak power occurs. either way, you're not going to get past the 15 limit of MEP. If it makes 257 up out of 1.8 liters with a mep of under 15, it's going to need to make the peak power (which is usually redline) at 9.58k rpms, .... so again, it won't work.
- Chicane
It doesnt matter where the redline is... he could have it at 15.000rpm for that matter.
Rjudgey, I'm looking forward to get some work done on my own engine. Sounds like you've got some neat plans for your own engine too. I've got a lot of expences at the moment which is postponing the project a little.
have you guys ever seen when Endyn made a built Cr-Vtec engine that was doing over 300hp NA at like 10.5KRpm?
429whp 362wtq A20 TURBO. A20T>*
The old one. I used to read his stuff but there some pretty tall tales. I dunno did they ever produce that super charger that like ran 23 psi on a stock motor with traction control and all that they kept talking about?? it but i never heard about a kit. It was alway "were to busy to mess around with stuff likethat" that made me smell..... well shit to be frankly.Originally Posted by AccordEpicenter
posta link I wanna brush up on his jibber jabber.
wp
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http://www.theoldone.com/articles/badtothebone/
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- llia
400 hp on a b-18 17-23 psi himm I might have the money nexy year when i sell my house....
wp
Chicane: Sorry to bug you again, but what are the units you are using? is it in KPa or psi? 15 what?
Here is the text book version of the limits, for a NA motor the bmep valves range from 850 to 1050 kPa (125 to 150 psi) at the rpm where max torque is achieved and for max power rpm its about 10% to 15% lower. For turbo motors, its 1250 to 1700 Kpa (180 to 250 psi) For non intercooled. and For intercooled motors, it can be upto 1400 KPa.
Here is for our motor @4000 rpm where we make peak torque. and @ 5500 where we make peak power. Disp is 1955 cc (119.301 cid)
@4000 :: mep (psi) = 120 * 2 * 396000 / (119.301 * 4000) = 199.160 psi
@5500 :: mep (psi) = 120 * 2 * 396000 / (119.301 * 5500) = 144.844 psi.
for the Jun ciivic at the peak power output, ((( Do note that this value is 10 ~ 15% less that the peak torque value. ))
@8100 :: mep (psi) = 257 * 2 * 396000 / (112.406 * 8100) = 223.555 psi
What is the point of the post? text books evaluations are limited to certain conditions, and when someone builds a motor, they can break all those rules in the book. This might seem impossible, but its possible. Its Science that MEP increases as compression ratio increases give the same motor. regardless of the displacement, a motor with a compression ratio of 10:1 having a mep of 146.488 psi which is within the limit can produce a mep of 155.916 psi if its compression ratio is increased to 12:1. So Chicane, stop saying its impossible alright? LOL you just dont have convincing proof to stand by it bro. Keep in mind, nothing is impossible.
Neither. I'm using HP/ (displacement (in liters) * redline(in thousands, so 7500= 7.5))= X
X is not exactly mep, but it's related to it. It's a good easy way of judging and engine's efficiency, and THUS FAR IN HUMAN HISTORY, no naturally aspirated engine has eclipsed the theoretical 15. I originally went to school for engineering and then changed my mind, so I have a lot of math and science in my background, but more importantly, and lot of friends still in the field. One of them has given me this equation. If you have an engine that you think is magically efficient, plug YOUR numbers into this equation. If you get over 15, something is bunk- double and triple check your numbers. If you still get over 15, please post it here, as i'm sure he'd like to be the first in the automotive engineering world to introduce an engine that beats the 15 mark.
Regards,
Chicane
http://www.junauto.co.jp/products/co.../index.html?en
JUN motor specs.
450,000 yen for stroker kit for the 2.2 nissan motor is the only price I can find. LOL wow how cheap. Oh yeah thats with there rods of course.
wp
Last edited by Oldblueaccord; 01-17-2005 at 11:23 PM.
chicane: all equations that involve units will pull out units in the answer. only ratios and constants (like Reynolds Number) dont have units. I am a graduated Mechanical engineer and i have taken a 6 month course in Internal combustion engine. I will be an automotive engineer in about 5 years once i get all my experience and requirements (experience) done. I dont know if you know about drag motors and their power output, but they do pull out crazy numbers and turbos put out 4 digit hp numbers on a 4 cyl, beats all text book calculations. So yeah, its already been done and maybe your friend does not know it yet, or he would like to be the first to have it have it on public cars driven everyday.
>sigh< NO IT HASNT. First off, that equation does put out something in units, I'm just not sure what. All I know is that there is not an internal combustion engine that will get over the magical 15 number. Don't believe me ? Try it. Go find ANY naturally aspirated engine and plug the numbers in. Go ahead. Get back to me hwne you find one that's over 15.
Dont believe you? Well i dont, without proper proof and relying on heresay of your friend. There are a lot of race bred na motors that we can try and find and plug your gustimation equation and get more than your magical 15. you just make me laugh Chicane. lol. well my work here is done.
Last edited by smufguy; 01-18-2005 at 10:05 AM.
Give me an example if there are so many. This is a challenge or a bet, however you take it. Find me ONE engine that you can plug into my equation and come up with a number of over 15. It has to be naturally aspirated. If you don't come up with any, I rest my case.
I though this was finished...
- llia
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