Engine overhauling
11-05-2011, 08:47 PM
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Engine overhauling
Hey! I've been pondering this question for awhile now. Being around my family an friends who've built everything from nova's to trans am's to mustang's. An i know alittle bit about building. how a built piston engine generaly consists of being bored out, stroked, camed, bigger intake an throttle body etc... what do you do to rotory engines? I've heard of porting an thats about all i know about. What els is there? Just wanting to build my knowledge 
11-05-2011, 08:55 PM
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Porting.
And that's pretty much it.
You can change the internal measurements of a piston engine easily. If you make even a slight adjustment to the rotor or housing or side plate, you HAVE to adjust the other 3. And by "adjust" I mean completely redesign and build from scratch at enormous expense.
There are some other options out there, such as enlarging coolant or oil passages, treating the internal engine surfaces, but porting work on the intake / exhaust is the limit of what you can do in terms of making power. And it's not a simple matter at all. The engine is very sensitive to minor changes, and it is very easy to disrupt airflow more than improve it.
And that's pretty much it.
You can change the internal measurements of a piston engine easily. If you make even a slight adjustment to the rotor or housing or side plate, you HAVE to adjust the other 3. And by "adjust" I mean completely redesign and build from scratch at enormous expense.
There are some other options out there, such as enlarging coolant or oil passages, treating the internal engine surfaces, but porting work on the intake / exhaust is the limit of what you can do in terms of making power. And it's not a simple matter at all. The engine is very sensitive to minor changes, and it is very easy to disrupt airflow more than improve it.
11-05-2011, 09:08 PM
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haha I know how a rotory engine works ... suck squeez bang blow... haha jk but yea i get the jist of the rotory. An that makes me sad knowing that i will be only able to do porting, an yea it being a sensative engine is what I've also read. I really wanna go over 500 rwhp, might not be anytime real soon cuz of budgets but thats my MAIN goal.
11-05-2011, 09:18 PM
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If you do indeed get to 500rwhp, you would be breaking new ground that has never been touched by a Renesis (of if it has, it hasn't been announced). And you will probably be easily into the $50k+ range of trial and error, development, replacement engines, etc... That's probably too low of a guess. $100k+ is more likely. ($10k engine builds add up fast when they don't last long due to the abuse you are shoving at them)
The simple fact governing this is that our side exhaust ports have almost no expansion room, creating a restriction to exhaust flow capping the amount of exhaust the engine can expel, etc...
Mazdamaniac got into the low 400s and has gone through ...9? engines so far.
The RX-7 engines are proven capable of hitting that mark, or higher, because their peripheral ports are easily expanded. Increasing the rotor count to 3 or 4 and you can get their for far cheaper. Turbo'ed 13b REW from an FD will run you $12-$15k for the swap. Turbo 20b will run you $20-$30k for the swap.
And then there is the slew of piston engines you can pour your wallet and soul into trying to get to work. Apparently 2jz swaps are common in Pakistan (? I think I have the right country).
Edit:
Adding "haha" every half sentence in your post makes you sound like an immature kid. If this description is accurate, be prepared to have the thread bombed because you are just another guy trying to strike a match in a hurricane. If it isn't accurate, try for articulation, grammar, punctuation, and proper phrasing and you might not get flamed...as much.
The simple fact governing this is that our side exhaust ports have almost no expansion room, creating a restriction to exhaust flow capping the amount of exhaust the engine can expel, etc...
Mazdamaniac got into the low 400s and has gone through ...9? engines so far.
The RX-7 engines are proven capable of hitting that mark, or higher, because their peripheral ports are easily expanded. Increasing the rotor count to 3 or 4 and you can get their for far cheaper. Turbo'ed 13b REW from an FD will run you $12-$15k for the swap. Turbo 20b will run you $20-$30k for the swap.
And then there is the slew of piston engines you can pour your wallet and soul into trying to get to work. Apparently 2jz swaps are common in Pakistan (? I think I have the right country).
Edit:
Adding "haha" every half sentence in your post makes you sound like an immature kid. If this description is accurate, be prepared to have the thread bombed because you are just another guy trying to strike a match in a hurricane. If it isn't accurate, try for articulation, grammar, punctuation, and proper phrasing and you might not get flamed...as much.
Last edited by RIWWP; 11-05-2011 at 09:20 PM.
11-05-2011, 09:39 PM
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You clearly don't know jack about what you are dealing with.
Start with lots and lots and lots of research and reading about things like compressor flow charts, turbo heat generation, combustion flame fronts, rotary combustion dynamics, side seal temperature control, inequal thermal efficiency zones, etc... But that's even assuming that you know about things like octane and what it actually does, detonation sources, plug temperature ranges, charge cooling, apex seal stress, etc... And I don't think you even know that.
No, it is not a matter of just "putting on a bigger turbo"
Are you aware that the rotary doesn't have pistons? Maybe you should just start with the basics.
Start with lots and lots and lots of research and reading about things like compressor flow charts, turbo heat generation, combustion flame fronts, rotary combustion dynamics, side seal temperature control, inequal thermal efficiency zones, etc... But that's even assuming that you know about things like octane and what it actually does, detonation sources, plug temperature ranges, charge cooling, apex seal stress, etc... And I don't think you even know that.
No, it is not a matter of just "putting on a bigger turbo"
Are you aware that the rotary doesn't have pistons? Maybe you should just start with the basics.
11-05-2011, 10:10 PM
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I've searched stuff on the fourm an came up with nothing, besides that a 20b engine is jesus, an 13b out of a rx8 are very unreliable an are torque less engines. Never have found numbers where too much power is too much power.
11-05-2011, 10:27 PM
#16
The only way to obtain an increase in power is through Forced Induction. So far the reliable/driveable limitations on boost (for the Renesis) are 14psi +/-. That will net you 300 rwhp +/-.
Now if you do not understand why that is a limitation. Then I suggest you read a lot more about the Renesis and boost on this forum.
Now if you do not understand why that is a limitation. Then I suggest you read a lot more about the Renesis and boost on this forum.
11-05-2011, 11:49 PM
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You clearly don't know jack about what you are dealing with.
Start with lots and lots and lots of research and reading about things like compressor flow charts, turbo heat generation, combustion flame fronts, rotary combustion dynamics, side seal temperature control, inequal thermal efficiency zones, etc... But that's even assuming that you know about things like octane and what it actually does, detonation sources, plug temperature ranges, charge cooling, apex seal stress, etc... And I don't think you even know that.
No, it is not a matter of just "putting on a bigger turbo"
Are you aware that the rotary doesn't have pistons? Maybe you should just start with the basics.
Start with lots and lots and lots of research and reading about things like compressor flow charts, turbo heat generation, combustion flame fronts, rotary combustion dynamics, side seal temperature control, inequal thermal efficiency zones, etc... But that's even assuming that you know about things like octane and what it actually does, detonation sources, plug temperature ranges, charge cooling, apex seal stress, etc... And I don't think you even know that.
No, it is not a matter of just "putting on a bigger turbo"
Are you aware that the rotary doesn't have pistons? Maybe you should just start with the basics.
11-05-2011, 11:51 PM
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11-06-2011, 10:16 AM
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children have no business playing on the internet
https://www.rx8club.com/rx-8-racing-25/05-rx8-vs-06-v6-mustang-225112/
https://www.rx8club.com/rx-8-racing-25/05-rx8-vs-06-v6-mustang-225112/
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