custom rotor housing exhaust plugs. who is able to make?
02-20-07, 04:54 AM
#1
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custom rotor housing exhaust plugs. who is able to make?
Looking for the high temp resistant custom plugs with thicker walls than stock.
Stock ones can`t be well ported...
thanks!
Stock ones can`t be well ported...
thanks!
02-20-07, 02:36 PM
#2
Are you referring to the exhaust port's stainless sleeve insert?
I was just looking through a HyperRev for RX-7 this weekend and saw 2 Japanese companies making exhaust port sleeve replacements.
I have no further information, except keep searching- they are out there.
I was just looking through a HyperRev for RX-7 this weekend and saw 2 Japanese companies making exhaust port sleeve replacements.
I have no further information, except keep searching- they are out there.
02-20-07, 05:06 PM
#3
Can I ask a stupid question...Why do you need them? Maybe we are not extreme enough, but I don't recall our ever having a reason to use anything but the stock exhaust sleeves in motors up to and including 750rwhp. What are you trying to accomplish?
02-21-07, 02:59 AM
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Blake, I am building 1300hp methanol race motor, this is why...
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
02-21-07, 03:39 AM
#5
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Originally Posted by 20bfd3s
Blake, I am building 1300hp methanol race motor, this is why...
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
Why not have a machine shop copy the stock inserts out Inconel
02-21-07, 08:32 AM
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Originally Posted by moremazda
Why not have a machine shop copy the stock inserts out Inconel
unfortunately i dont have here any machine shop in reach ready for this work...
02-21-07, 09:01 AM
#7
Tequila? ..it's like beer
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Are you looking for something like this?:
Rotarygod has a set that were made by TurboStreetFighter (long since departed rotary drag racer). I would PM him to start with.
To answer the questions of WHY, please do some reading here:
https://www.rx7club.com/rotary-car-performance-77/custom-exhaust-sleeves-explained-120200/
Rotarygod has a set that were made by TurboStreetFighter (long since departed rotary drag racer). I would PM him to start with.
To answer the questions of WHY, please do some reading here:
https://www.rx7club.com/rotary-car-performance-77/custom-exhaust-sleeves-explained-120200/
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02-21-07, 11:01 AM
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Originally Posted by NewbernD
Are you looking for something like this?:
Rotarygod has a set that were made by TurboStreetFighter (long since departed rotary drag racer). I would PM him to start with.
To answer the questions of WHY, please do some reading here:
https://www.rx7club.com/showthread.php?t=120200
Rotarygod has a set that were made by TurboStreetFighter (long since departed rotary drag racer). I would PM him to start with.
To answer the questions of WHY, please do some reading here:
https://www.rx7club.com/showthread.php?t=120200
But ports on this picture are too small, i`d like to make much bigger.
That is no problem, just need sleeves with any hole inside.
Another problem is that I need Three of them ( 3 rotor engine).
Please let me know if you or RotaryGod could help me to get it...
02-21-07, 11:20 AM
#9
Originally Posted by 20bfd3s
Blake, I am building 1300hp methanol race motor, this is why...
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
ported stock inserts crack due to high ex. temp and thin walls...
thanks, i will keep searching.
I just see so many people looking for new ways to spend money to solve non-issues, I had to ask.
02-21-07, 11:21 AM
#10
I do have them drawn up in CAD. I can get new ones made at any time but it will be up to you to get an exhaust flange that matches. I have 2 port sizes. That one is the small one. The one in the picture has actually been ground out. It comes a little bit smaller than the stock port opening so someone could install them in a stock port engine and do some grinding to get better flow without more port timing. The other set I have is much larger. I have them set up with enough meat on them to give them the same exhaust port timing that the 787B had which is quite a bit. The'll go really big. I'm sure they'll flow enough for what you want to do. The decrease in turbulence alone due to the constant area of the ports is substantial. On street engines I actually don't even make the exhaust ports larger than stock. I just use the sleeves. I haven't talked to a machine shop about pricing in a long time and I need to go back and figure out what material would be best. I didn't choose it the first time and I'm down to my last set which I am keeping. I'll probably get them made from a low carbon steel so it would be best to get them ceramic coated.
02-21-07, 01:40 PM
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Originally Posted by Blake
Ahh, okay. That's interesting territory. I just see so many people looking for new ways to spend money to solve non-issues, I had to ask.
I just see so many people looking for new ways to spend money to solve non-issues, I had to ask.now i`d like to spend some money into better sleeves, make larger ports and get improved flow turbulence issue, so well described by RotaryGod. i am sure all of those aspects does matter to overall perfromance and reliability.
attached is my intake square porting with almost "direct" injection
there will be one more rail in the intake with 3 more injectors, totally 9x1600cc.
Last edited by 20bfd3s; 02-21-07 at 01:50 PM.
02-21-07, 02:05 PM
#13
HOLY NO INTAKE VELOCITY BATMAN!!! Man, you turning that engine over to like 20k RPMS?? those ports are the biggest I've ever seen!! And custom 3 rotor eh? Looks like standard 13b intermediate plates, not 20b parts. I wont comment on the engineering, but excellent machine work!!
~Mike..............
~Mike..............
02-21-07, 02:11 PM
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Jeebus.. those are gynormous.
As an alternative to making a replacement insert like these you could remove the factory insert and extend the exhaust primary through the flange and right up to the port. It may take some creativity to shape the transition properly but it might be easier to accomplish that in your part of the world.
As an alternative to making a replacement insert like these you could remove the factory insert and extend the exhaust primary through the flange and right up to the port. It may take some creativity to shape the transition properly but it might be easier to accomplish that in your part of the world.
02-21-07, 02:21 PM
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Originally Posted by rotarygod
I suspect that if he's shooting for 1300 hp, he's going to let the pressure from the turbo and not intake velocity do the work for him. It looks like a pretty purpose built thing to me.
I sent you PM regarding sleeves, thanks.
02-21-07, 02:47 PM
#17
With intake ports that large I am not understanding why wouldn't you remove the exhaust sleeve all together and port the exhaust much larger.
Look at the exhaust on a 300 HP 2 rotor P-port NA.
Now, I am not understanding why you would want a SMALLER exhaust port/runner when your intake port is so much larger.
Look at the exhaust on a 300 HP 2 rotor P-port NA.
Now, I am not understanding why you would want a SMALLER exhaust port/runner when your intake port is so much larger.
02-21-07, 03:03 PM
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Originally Posted by BLUE TII
With intake ports that large I am not understanding why wouldn't you remove the exhaust sleeve all together and port the exhaust much larger.
Look at the exhaust on a 300 HP 2 rotor P-port NA.
Now, I am not understanding why you would want a SMALLER exhaust port/runner when your intake port is so much larger.
Look at the exhaust on a 300 HP 2 rotor P-port NA.
Now, I am not understanding why you would want a SMALLER exhaust port/runner when your intake port is so much larger.
exhaust ports should not be VERY large or you`ll lost more than get.
02-21-07, 03:09 PM
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Originally Posted by NewbernD
Jeebus.. those are gynormous.
As an alternative to making a replacement insert like these you could remove the factory insert and extend the exhaust primary through the flange and right up to the port. It may take some creativity to shape the transition properly but it might be easier to accomplish that in your part of the world.
As an alternative to making a replacement insert like these you could remove the factory insert and extend the exhaust primary through the flange and right up to the port. It may take some creativity to shape the transition properly but it might be easier to accomplish that in your part of the world.
02-21-07, 03:56 PM
#21
spoon!
Originally Posted by BLUE TII
With intake ports that large I am not understanding why wouldn't you remove the exhaust sleeve all together and port the exhaust much larger.
02-21-07, 04:52 PM
#23
Originally Posted by 20bfd3s
do you route high temp exhaust gases through alluminium with out sleeve at all?? I dont think that is good idea!
exhaust ports should not be VERY large or you`ll lost more than get.
exhaust ports should not be VERY large or you`ll lost more than get.
A larger exhaust port isn't always better. Just like anything else. He could probably get away with smaller intake ports and be just fine. Just because the intake ports are large does not mean the exhaust ports need to be that large too. Abel's ports probably aren't as large as many of you think they are. Even Racing Beat's Bonneville engines had smaller exhaust ports than many people here do to their street engines. There's more to exhaust than just pure size. Port timing is also very important.
02-21-07, 05:09 PM
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Originally Posted by rotarygod
It's fine. The coolant system is constantly removing heat from the aluminum. It is very possible to melt a hole through a housing if your cooling system fails when under power though.
A larger exhaust port isn't always better. Just like anything else. He could probably get away with smaller intake ports and be just fine. Just because the intake ports are large does not mean the exhaust ports need to be that large too. Abel's ports probably aren't as large as many of you think they are. Even Racing Beat's Bonneville engines had smaller exhaust ports than many people here do to their street engines. There's more to exhaust than just pure size. Port timing is also very important.
A larger exhaust port isn't always better. Just like anything else. He could probably get away with smaller intake ports and be just fine. Just because the intake ports are large does not mean the exhaust ports need to be that large too. Abel's ports probably aren't as large as many of you think they are. Even Racing Beat's Bonneville engines had smaller exhaust ports than many people here do to their street engines. There's more to exhaust than just pure size. Port timing is also very important.
I agree about port size, you can not make ports big w/o extensive timing. Earlier you open exhaust - more power you loss, later you close exhaust - more overlap you get.
02-22-07, 05:23 PM
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I am just going to add my 2c worth here...
Methanol motors have lower EGTs than petrol motors, so there is no need to stress about that.
The other point I would like to make is 9 x 1680cc Injectors is exactly half the fuel requirement you will need. We run 6 x 1680cc Injectors PER ROTOR in our new methanol engine (Guru PP).
Similar to this 13b:
Methanol motors have lower EGTs than petrol motors, so there is no need to stress about that.
The other point I would like to make is 9 x 1680cc Injectors is exactly half the fuel requirement you will need. We run 6 x 1680cc Injectors PER ROTOR in our new methanol engine (Guru PP).
Similar to this 13b:
Last edited by mad20b; 02-22-07 at 05:29 PM.