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Old 03-10-2009 | 01:15 PM
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When I got a rotor clock it just further impressed upon me how amazingly small our rotary is compared to a similar output piston engine. It's just over 12 inches tall!

The 'turbine' action of the rotary is more mechanically efficient than counteracting piston action. Also, the combustion volume is much larger in the rotary compared to a 1.3L piston engine. As we know, about its only drawback is relatively poor gas mileage, which the 16X is expected to address with its greater thermal efficiency.


Atkins Rotary clock http://www.atkinsrotary.com/store/pr...0&cat=0&page=1

Last edited by Huey52; 03-10-2009 at 01:37 PM.
Old 03-10-2009 | 01:17 PM
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I just watched a CnD video of the rotary engine. Since its a 2 rotor we only have 2 exhaust ports?
Old 03-10-2009 | 01:23 PM
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Originally Posted by Eric1987
I just watched a CnD video of the rotary engine. Since its a 2 rotor we only have 2 exhaust ports?
We have a Renesis rotary engine. There are 2 side exhaust ports (one per rotor) and one shared port in the center that serves both rotors.
Old 03-10-2009 | 01:28 PM
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They can play tunes to!

http://www.youtube.com/watch?v=iIsWcbFgPd8
Old 03-10-2009 | 01:30 PM
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Renesis has three exhaust ports. Center housing and both end housings (center is shared).

Originally Posted by Eric1987
I just watched a CnD video of the rotary engine. Since its a 2 rotor we only have 2 exhaust ports?
Old 03-10-2009 | 01:47 PM
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Originally Posted by Eric1987
So the rotary engine maKes all its power by going around the combustion? chamber? And thats it? How is it so much harder for piston engines and so easy for rotary engines per litre to make so much power?
You can think of each rotor as three pistons melted togrther into a triangle. The greater power per volume comes from there being one power pulse per eccentric shat rotation, comparable to the power per volume of a 2-cycle piston engine, which also has one spark per cylinder per crankshaft revolution--that's 2x that of a 4-stroke piston engine.
Old 03-10-2009 | 02:01 PM
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Originally Posted by Eric1987
How much does the Renesis weigh?
184 lbs for a short block and 268 lbs fully dressed without clutch.
Old 03-10-2009 | 02:32 PM
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the tranny is bigger than the engine
Old 03-10-2009 | 04:04 PM
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small wankel...


story of OPs life
Old 03-10-2009 | 06:25 PM
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Originally Posted by robrecht
184 lbs for a short block and 268 lbs fully dressed without clutch.
DAMN I think my H22 was like 410 pounds and my LS1 was like 480 pounds...So in theory its easier to boost a renesis? Since you dont gotta do anything to internals or am I wrong?
Old 03-10-2009 | 06:34 PM
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Originally Posted by Eric1987
DAMN I think my H22 was like 410 pounds and my LS1 was like 480 pounds...So in theory its easier to boost a renesis? Since you dont gotta do anything to internals or am I wrong?
tuning is key on boosting a renesis due to high compression of 10:1

you should search more, all this is on this forum
Old 03-10-2009 | 06:39 PM
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Originally Posted by Eric1987
DAMN I think my H22 was like 410 pounds and my LS1 was like 480 pounds...So in theory its easier to boost a renesis? Since you dont gotta do anything to internals or am I wrong?
Boosting a rotary is rather easy. Tuning it, though, is the hard part. The internals are all fine to be boosted, and if you tune it right, it will treat you right.
Old 03-10-2009 | 06:56 PM
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ive edited my post...i feel like i had a bad day and spazzed out on you eric. lol

Last edited by rotarygreg; 03-10-2009 at 07:03 PM.
Old 03-10-2009 | 07:41 PM
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Originally Posted by CyberPitz
Boosting a rotary is rather easy. Tuning it, though, is the hard part. The internals are all fine to be boosted, and if you tune it right, it will treat you right.
Whats the hard part about tuning? I know it isnt simple but its done so often nowadays I cant imagine it being that hard to find a safe tune.
Old 03-10-2009 | 07:42 PM
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Originally Posted by Eric1987
Whats the hard part about tuning? I know it isnt simple but its done so often nowadays I cant imagine it being that hard to find a safe tune.
https://www.rx8club.com/showpost.php...8&postcount=36
Old 03-10-2009 | 07:58 PM
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I am getting really tired of people doing that **** to my threads. Of course if I was a girl in short shorts with an 8 you guys wouldnt be doing this.
Old 03-10-2009 | 08:00 PM
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Life is not fair....


BUT - I'll help; check stickies "FI for Dummies" and "So you wanna be a tuner?"
Old 03-10-2009 | 08:05 PM
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Originally Posted by Eric1987
I am getting really tired of people doing that **** to my threads. Of course if I was a girl in short shorts with an 8 you guys wouldnt be doing this.
well, you are going to have to do your own research on a subject like that, not really something that can be spoon fed to n00bs

check the threads Kane suggested...these things are stickies for a reason--so we don't get threads like this
Old 03-10-2009 | 08:07 PM
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You can also click my PPO2 Link.
Old 03-10-2009 | 08:21 PM
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Originally Posted by Kane
Life is not fair....


BUT - I'll help; check stickies "FI for Dummies" and "So you wanna be a tuner?"
That FI for dummies answered my question. Seems like rotarys are better and worse in some ways compared to piston engines.
Old 03-10-2009 | 08:22 PM
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Joo got it mang. There are always trade offs.
Old 03-10-2009 | 08:25 PM
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From what I read it seems simpler to do it but there are finer lines you gotta follow. One mistake you could **** up a rotary but with a piston engine you need to sleeve and reinforce it. That costs a lot of money. And one more question. How much power can the rear end take in the RX8 before it gives? My camaros 10 bolt couldnt even handle the power it was given stock.

Last edited by Eric1987; 03-10-2009 at 08:28 PM.
Old 03-10-2009 | 08:29 PM
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Why do you have to sleeve and build the motor? You trying to build an 8 sec car or something?


I think you may be missing some of the points. But your overall though is correct.... Rotary needs more airflow to make power than a piston motor; but it spools a turbo quicker, is smaller and more easily packaged....yada yada yada.

Also Rotary cannot take abuse (as a rule) like apiston motor... but has less working parts yada yada yada. There is no black and white.
Old 03-10-2009 | 09:09 PM
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Originally Posted by Kane
Why do you have to sleeve and build the motor? You trying to build an 8 sec car or something?


I think you may be missing some of the points. But your overall though is correct.... Rotary needs more airflow to make power than a piston motor; but it spools a turbo quicker, is smaller and more easily packaged....yada yada yada.

Also Rotary cannot take abuse (as a rule) like apiston motor... but has less working parts yada yada yada. There is no black and white.
Well you dont HAVE to sleeve the motor but the engines I have delt with you shouldnt go over 8-10 psi unsleeved and forged. The RX8 has a weak tranny? So basically the rear end is fine for almost anything streetable.
Old 03-10-2009 | 09:11 PM
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Rear end is good for 400WHP; then the shafts go.... go to BHR to get new ones.

Modding a car is simple - you mod it; break something - get stronger stuff... turn up the power - and break something new.


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