20B renesis pics!!!!!!!
03-24-2008, 11:41 AM
#31
Hi everyone.
I am said builder and tuner of this engine.
I run Hayward Rotary, www.mazdarotary.co.uk in England and have been into rotaries since the mid 1980's.
Glad you like the engine.
Regards
Carl Hayward
I am said builder and tuner of this engine.
I run Hayward Rotary, www.mazdarotary.co.uk in England and have been into rotaries since the mid 1980's.
Glad you like the engine.
Regards
Carl Hayward
The following users liked this post:
Harrod19 (01-11-2023)
03-24-2008, 11:51 AM
#33
No means yes
iTrader: (1)
Join Date: Nov 2006
Location: Jersey City NJ
Posts: 1,507
Likes: 0
Received 0 Likes
on
0 Posts
Welcome to the forums!
That's a pretty amazing engine you have there.. If you don't mind, I'm sure everyone here would love to hear about the process you went through, any problems you encountered.
Also, do you have any thoughts on what was mentioned by rotarygod about the center rotor's exhaust being more restrictive than the other two?
That's a pretty amazing engine you have there.. If you don't mind, I'm sure everyone here would love to hear about the process you went through, any problems you encountered.
Also, do you have any thoughts on what was mentioned by rotarygod about the center rotor's exhaust being more restrictive than the other two?
03-24-2008, 11:53 AM
#34
we have no power figures as yet.
I used 4 port Renesis end plates and RX8 rotors and seals.
The throttles are custom built for the engine 50mm.
We hand built the inlet and exhaust manifolds.
The engine pulls hard from low down,and keeps on pulling harder and harder up to 7000rpm which is the highest we have been so far.
I have mild ported the engine.
The real beauty of the engine though is one major thing,it is both powerful and quiet.
Regards
Carl
I used 4 port Renesis end plates and RX8 rotors and seals.
The throttles are custom built for the engine 50mm.
We hand built the inlet and exhaust manifolds.
The engine pulls hard from low down,and keeps on pulling harder and harder up to 7000rpm which is the highest we have been so far.
I have mild ported the engine.
The real beauty of the engine though is one major thing,it is both powerful and quiet.
Regards
Carl
The following users liked this post:
Harrod19 (01-11-2023)
03-24-2008, 11:55 AM
#36
Center rotors exhaust is actually no problem at all.
I think that some have forgotten that you can play with things,but also since there is no overlap between induction and exhaust that helps.
The port area is actually greater than a pp exhaust port on an FD RX7.
I spent alot of time going through what is needed and what will work,and we are really pleased with the result.
Regards
Carl
I think that some have forgotten that you can play with things,but also since there is no overlap between induction and exhaust that helps.
The port area is actually greater than a pp exhaust port on an FD RX7.
I spent alot of time going through what is needed and what will work,and we are really pleased with the result.
Regards
Carl
The following users liked this post:
Harrod19 (01-11-2023)
The following users liked this post:
Harrod19 (01-11-2023)
03-24-2008, 09:44 PM
#46
https://www.rx8club.com/showpost.php...08&postcount=6
Sorry, I disagree with the center rotor exhaust. Dual siamese ports on the center rotor will result in significantly less top end flow than the outer rotors. The exhaust flow overall is the Renesis weakness. The center rotor will be worse still. Of course if you're happy with a 7000 rpm top end, then that's all that matters.
Not knocking you though, that's quite an interesting accomplishment to achieve and be proud of.
Sorry, I disagree with the center rotor exhaust. Dual siamese ports on the center rotor will result in significantly less top end flow than the outer rotors. The exhaust flow overall is the Renesis weakness. The center rotor will be worse still. Of course if you're happy with a 7000 rpm top end, then that's all that matters.
Not knocking you though, that's quite an interesting accomplishment to achieve and be proud of.
Last edited by TeamRX8; 03-24-2008 at 09:50 PM.
03-25-2008, 05:28 AM
#47
I think that anyone who has not actually built an engine like this cannot really comment for sure on how it will behave.
I too had some misgivings about what the result would be,but it is far better than we expected.
The fact that the exhaust we have built on the center rotor is very free flowing as compared to the RX8 original manifold helps,as does careful work on the overall exhaust.
The 7000rpm is not the limit that the engine will run,but is just where we are with it now having only run some 500 miles,we do know that at 7000rpm the engine is still pulling hard, so clearly we will be using more rpm soon,then we'll go on the dyno.
Back to the center rotors exhaust,think about it for a moment,what sort of pressure is the combustion gas at when the exhaust port first opens? It is seriously higher than atmospheric,so where does that exhaust gas naturally want to go? And it does this very easily, also I have not revealed what we have done internally on the engine regarding the exhaust.
All I will say is that I bet there will be alot more of these engines produced now.
I can't emphasise enough that it works really well.
Regards
Carl
I too had some misgivings about what the result would be,but it is far better than we expected.
The fact that the exhaust we have built on the center rotor is very free flowing as compared to the RX8 original manifold helps,as does careful work on the overall exhaust.
The 7000rpm is not the limit that the engine will run,but is just where we are with it now having only run some 500 miles,we do know that at 7000rpm the engine is still pulling hard, so clearly we will be using more rpm soon,then we'll go on the dyno.
Back to the center rotors exhaust,think about it for a moment,what sort of pressure is the combustion gas at when the exhaust port first opens? It is seriously higher than atmospheric,so where does that exhaust gas naturally want to go? And it does this very easily, also I have not revealed what we have done internally on the engine regarding the exhaust.
All I will say is that I bet there will be alot more of these engines produced now.
I can't emphasise enough that it works really well.
Regards
Carl
The following users liked this post:
Harrod19 (01-11-2023)
03-25-2008, 05:40 AM
#48
The thing I'm really intrigued by is the departure from a "normal" 20B in that this one doesn't look like it uses a special center place in between the 1st and 2nd rotors. I've never built a 20B, but I've helped a fella who has done more than most. Normally the 20B has a split crank with a hirth coupling, and I think that is the reason for the special (wide) plate.
Care to commant, Carl?
This special plate is one of the reasons why 20B's are expensive to rebuild, as these plates are not found on the cazillions of 13B motors out there. I know it is common here to obtain a 20B from a cosmos by going to the "extreme" of importing a front cut.
This innovation might make 20B's more of a readily available reality. When is the 26 coming Carl?
Cheers,
Hymee.
Care to commant, Carl?
This special plate is one of the reasons why 20B's are expensive to rebuild, as these plates are not found on the cazillions of 13B motors out there. I know it is common here to obtain a 20B from a cosmos by going to the "extreme" of importing a front cut.
This innovation might make 20B's more of a readily available reality. When is the 26 coming Carl?
Cheers,
Hymee.
03-25-2008, 05:49 AM
#49
https://www.rx8club.com/showpost.php...08&postcount=6
Sorry, I disagree with the center rotor exhaust. Dual siamese ports on the center rotor will result in significantly less top end flow than the outer rotors. The exhaust flow overall is the Renesis weakness. The center rotor will be worse still. Of course if you're happy with a 7000 rpm top end, then that's all that matters.
Not knocking you though, that's quite an interesting accomplishment to achieve and be proud of.
Sorry, I disagree with the center rotor exhaust. Dual siamese ports on the center rotor will result in significantly less top end flow than the outer rotors. The exhaust flow overall is the Renesis weakness. The center rotor will be worse still. Of course if you're happy with a 7000 rpm top end, then that's all that matters.
Not knocking you though, that's quite an interesting accomplishment to achieve and be proud of.
I'll give credance to one who has run a number oppoosed to incomplete theory.
Cheers,
Hymee.
03-25-2008, 08:08 AM
#50
Registered
The thing I'm really intrigued by is the departure from a "normal" 20B in that this one doesn't look like it uses a special center place in between the 1st and 2nd rotors. I've never built a 20B, but I've helped a fella who has done more than most. Normally the 20B has a split crank with a hirth coupling, and I think that is the reason for the special (wide) plate.
Care to commant, Carl?
This special plate is one of the reasons why 20B's are expensive to rebuild, as these plates are not found on the cazillions of 13B motors out there. I know it is common here to obtain a 20B from a cosmos by going to the "extreme" of importing a front cut.
This innovation might make 20B's more of a readily available reality. When is the 26 coming Carl?
Cheers,
Hymee.
Care to commant, Carl?
This special plate is one of the reasons why 20B's are expensive to rebuild, as these plates are not found on the cazillions of 13B motors out there. I know it is common here to obtain a 20B from a cosmos by going to the "extreme" of importing a front cut.
This innovation might make 20B's more of a readily available reality. When is the 26 coming Carl?
Cheers,
Hymee.
This kit is best used with peripheral port.
Hope that helps