power for 2.5L by adding bigger flywheel??? true? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 01-19-2001, 12:58 AM
Wrangler88
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power for 2.5L by adding bigger flywheel??? true?

a buddie of mine who is a mechanic says that if i add a bigger flywheel to my 2.5L in my 95 wrangler that since its bigger and causes more momentum, it'll make it seem like my engine is putting out more power on the highway and such.. is this true? anyone try this, or is he just a misguided and confused person.. i don't have a clue if hes right or wrong he thought he read that they guy with the 4cly that won the good year rockcrawling competition did this which gave him the power to over do what he did.. thanks for any info and parts that would make this work!

(\/)ikey
1988 Wrangler Laredo 4.2L w/5spd Manual
1995 Wrangler 2.5L w/ 5spd / 31"BFG AT's
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post #2 of (permalink) Old 01-19-2001, 04:46 AM
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Re: power for 2.5L by adding bigger flywheel??? true?

yep.. since its spinning a greater wieght.. it will give the engine more torque especially at lower rpms.. its not really bigger.. per say.. what they do to them.. is add weight to it.. i think its in the neighborhood of like 9 pounds...
there is a write up of it on the http://www.outdoorwire.com/4x4/jeep/


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post #3 of (permalink) Old 01-19-2001, 05:10 AM
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Re: power for 2.5L by adding bigger flywheel??? true?

If the question is: Does a heavier flywheel attached to the flywheel increase power?

Then the ansewer is no.

Power is supplied by the engine. That rate of power production is fixed by the internal specifications and how they react to fuel delivery and load. However the ability to shift how the range of power is used efficently can be changed.

Remember all the flywheel is doing is storing energy for release. The energy is stored as the pistion's rotate downward under power from the plasma burn. During the time that the engine is not powering the crank the flywheel provides balnace by releasing it's stored energy. The flywheel is providing rotational balance during the release time.

If the flyweel is heavier then it provides more stored energy and "enlarges" the lower and higher RPM points at which the released energy becomes effective. To be more accurate, the engine has to provide the energy stored by the flwheel. As the weight of the flywheel increases the engine has to work a wee bit harder to move that increased weight. So, the effect is a small loss of HP delivered to the drive train for what appears to be the ability to do more work in a lower RPM band.

The bottom line is that it's a trade-off with a small efficency loss.

Safe Jeepin'

LEVE
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post #4 of (permalink) Old 01-19-2001, 08:33 AM
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Re: power for 2.5L by adding bigger flywheel??? true?

[img]/wwwthreads_images/icons/smile.gif[/img] Once again LEVE makes the complex seem simple. As mentioned, the flywheel is only an energy STORAGE device, and has no ability to MAKE horsepower. However, with a heavy flywheel you can pop the clutch at idle and the Jeep will lurch forward and not stall.....that's what flywheels are for. Ever notice how easy it is to stall one of the modern-type mini autos? Yep....they have almost NO flywheel and the clutch weighs very little. Here is an interesting note: MODEL A FORDS have a flywheel that is SO HEAVY that the sheer weight of the flywheel wears out the rear main bearing. We used to have little "Jitneys" made from Model A Fords and the flywheel weight made them just like a tractor. That same weight, however, makes the Model A's sluggish when winding up between gears, since the engine has to invest the HP to get the flywheel up to speed, and then when you back off to shift, the engine takes forever to drop RPM to find the next gear. One of our buddies who has a prize-winning Model A has shaved 60 POUNDS off the flywheel to get the Model A to be more "spritely" between gears.....and to keep from wearing out the mains too. [img]/wwwthreads_images/icons/crazy.gif[/img]

CJDave
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post #5 of (permalink) Old 01-19-2001, 12:05 PM
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Re: power for 2.5L by adding bigger flywheel??? true?

I can see it now...

"So I put a 6" chrome exhaust tip and a 4000# flywheel on my Honda Civic lowrider...and now it'll do 0-60 in 3 seconds because of the horsepower increase..."

Moneyless, Will weld for jeep accessories.
post #6 of (permalink) Old 01-19-2001, 01:05 PM
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Re: power for 2.5L by adding bigger flywheel??? true?

[img]/wwwthreads_images/icons/tongue.gif[/img] Now Farmjeep.......... you know how these myths can be.[img]/wwwthreads_images/icons/smile.gif[/img] Why when I wuz a kid we thought that if you had ONE carb on your 1951 216 babbett-beater Chevy Six, and the car would do eighty(maybe); and then you put TWO carbs on it, you could do one-hundred sixty......it just STANDS TO REASON. Let X equal the amount of "Stuff" sold to increase HP and in actuality only DECREASES the bank account.[img]/wwwthreads_images/icons/laugh.gif[/img] If I NEVER see another Honda with one of those big pipes on it it will STILL be too soon. You ought to go to Silicon Valley where the oriental population is overwhelming.....EVERY OTHER CAR is that way. YUK!! [img]/wwwthreads_images/icons/frown.gif[/img]

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post #7 of (permalink) Old 01-19-2001, 01:27 PM
 
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Re: power for 2.5L by adding bigger flywheel??? true?

I remember when I was a kid and we thought a car would go as fast as the highest number on the speedometer! So that's how we compared them!

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post #8 of (permalink) Old 01-19-2001, 01:29 PM
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Re: power for 2.5L by adding bigger flywheel??? true?

Yea, TriCountyGear made a rockcrawler for the Goodyear series using that, I think. Jason Bunch did the driving. I even think that they were trying to market that flywheel for the 2.5L. That would defintly take a heavy duty clutch and pressure plate to controll and keep from burning them up. That was one tricked out crawler.




Jason

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post #9 of (permalink) Old 01-19-2001, 01:40 PM
 
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Re: power for 2.5L by adding bigger flywheel??? true?

I've been in touch with Jason at Tri County Gear about getting one of those "inertia rings" for my 4 banger since I need to pull the tranny anyway. He's not been exactly prompt in getting these though.
Anyone else want to make one and sell it to me?

John
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post #10 of (permalink) Old 01-20-2001, 03:12 AM
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Re: power for 2.5L by adding bigger flywheel??? true?

hey ratherbejeeping-- so i take it u've called tricounty about the inertia rings? are they selling them or whats the deal with them? how much are they selling them for and does anything else need to be replaced with it so it doesn't burn out the clutch or anyhthing?? thanks. i'll give them a call monday.. if its a reasonable price i'll buy one and throw it in sometime soon and let everyone know how it is.. thanks!

(\/)ikey
1988 Wrangler Laredo 4.2L w/5spd Manual
1995 Wrangler 2.5L w/ 5spd / 31"BFG AT's
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