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For what it's worth... I ordered a stage 2.5 long block from 22RE Performance and bolted a LC Engineering header on my 85 Sr5 and it runs great. If you are looking for HUGE gains in torque and HP then it may be less expensive doing some sort of engine swap for a larger more powerful motor. Looking back I wish I would have done a swap in mine. The gains were minimal and the cost were excessive. Don't get me wrong they build one mean 22RE and it does feel like it has more power over the one I replaced but I wouldn't do it again.
For what it's worth...
the 22RE is a little tractor motor.
Generally you should only ever bore to the next size up which cleans up any scratches or pitting in the walls. The extra displacement you gain from boring bigger is not going to give you any extra power. You want to only bore as much as necessary so if you need to rebuild it again in 300,000 miles (unlikely) you'll still have room to go.I have the 35 lb flywheel from LCE. It's a bit pricey for what it is. It is not at all noticeable on the street, maybe a bit harder to stall off the line. Where it shines is off road. The truck is very hard to stall. It doesn't add torque as LCE claims, just adds rotational inertia and smooths out power down low. Without touching the throttle, the engine will go down to 250 - 300 RPM and keep driving. Stalls when it gets down to around 200 RPM. If I had it all to do again would I buy it? I'm not sure. It's pretty expensive. But I do have it and it does help and I'm happy with it.Don't have much to add for your other questions.
The hypothetical gains from boring 0.060" over are pretty small. It's also anyone's guess whether you could truly feel 5 ft-lbs increase. So I'm not going to argue that.The flywheel does not add torque. Torque is force x distance. The force comes from the fuel air mixture exploding and pushing down on the piston. The distance is the offset from the rod big end centerline to the crankshaft centerline. None of that changes when you change the flywheel. The flywheel adds rotational inertia. The flywheel absorbs energy by increasing rotational speed, and released energy by decreaseding its rotational speed. When compared to a ligher flywheel, a heavier flywheel can absorb more energy at the same rotational speed, and correspondingly, it can realease more energy for the same reduction in rotational speed.I agree 100% that lugging the engine down to 200 RPM isn't a good idea for exactly the reasons you stated. It was just a demonstration of how the engine is harder to stall with a heavier flywheel.
Rotational torque… a flywheel releases stored energy by applying torque to a mechanical load, You can call it what you want. I’ll stick with “torque”, you can call it inertia.
In my 22R I could “feel” and see the RPM drop by 100 to 200 RPMs when I turned on the AC compressor. How many pounds of torque were required to spin the AC compressor. I could also feel and see the RPMs drop when I turned on the lights. How many pounds of torque does it take to spin the alternator under load?
Can an engine dyno measure a change in 1 HP? How much torque equals 1 HP? Is that a “hypothetical” measurement?
... a heavier flywheel does not increase the torque output of an engine.
What do you call the FORCE that inertia applies to a rotating mass?
When a torque is applied to an object it begins to rotate with an acceleration inversely proportional to it moment of inertia. This relation can be thought of as Newton's Second Law of rotation.
The moment of inertia is the rotational mass...
I attended a different school and different physics classes.Perhaps, commonly, we are discussing conceptual semantics.
I see a few posts about boring the block here. Boring the block IS a minimal gain across the board. BUT there are advantages to a larger bore, primarily in the flow gains with the proper combustion chamber work. You'd be surprised what an extra mm of clearance will do on the intake, especially one designed to flow sideways into the cylinder. IF you want easy gains stroke it. Stroking the 22R does require a bit of tuning beyond what can be done stock fuel systems. Done right it'll last as long as a stocker, especially at the RPM ranges used in crawlers. Do your homework on that one. Either way you look at it, the only way to get more out of any engine is efficiency. More efficient intake and exhaust. More efficient combustion. Less friction. Proper tuning. You can go with an engine builder with experience, probably best, or do it yourself, research research research. Know what you want before you start, find out what you need to get it, and then look at your bank account cherishingly as it's going bye bye. It is definitely true that a swap will have the best bang for the buck though, unless you're like me and don't care about best bang and insist on doing what you can with what was provided, y'know, I'm keeping the 22RE and no, I'm not super or turbocharging the thing. Toyota has already proven the 22RE can be tuned for 140lbtq and 115hp. With a little tweaking and bolt-ons you can get another 10-20 lbft/hp. With another $3k you can get another 10-30 lbft/hp easy enough. The 22R really isn't a 'tuners' engine by any stretch of the imagination and all the stories your hear about big numbers, 200+ anything takes a lot of experience and even more money to get it.Take any and all advise with a grain of salt. 1mm oversize valves don't do anything spectacular without the corresponding port work and grind. A 'new head' can be worse than a rebuilt stocker if the designer sucks. Aftermarket pistons are a turkey shoot. Machine shops are probably your biggest worry, a bad shop can destroy all your research and expensive parts for a lot of money. And of course, if all is done perfectly and the tuning isn't right your engine can put out less than stock. Best to your build! Have fun doing it!
It doesn't.True.The moment of inertia is more complicated than that because it depends on the shape of the spinning object as well as its mass.As I said before these discussions are much clearer when everyone involved uses the correct terminology for the correct concepts. The last thing I have to say in this debate, which others have already said:A heavier flywheel (Actually a flywheel with greater moment of inertia) stores more energy at a given RPM than a lighter one. This extra energy can be used to help your engine keep spinning between cylinders firing at 200 RPM, or it can help your rock crawler tire climb over a bigger bump. These are good and worthwhile things but do not mean that the flywheel added any torque, just more stored energy in reserve. Like having more money in your savings account without changing your monthly income.I hope some of this is informative. Have a nice day everyone!
Alright guys, you're mixing apples and oranges here. .... A flywheel neither increases nor decreases an engines output.
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