Cracked front housing
07-09-2007 | 03:02 AM
#77
Thread Starter
sas
Joined: Nov 2006
Posts: 51
Likes: 0
From: Cape Town, South Africa
Progress report
Guys
I've been absent for a while from this board now and firstly I would like to say I don't like this idea of the discussion turning into a slanging match. Let's get back to business
1. I'm going to be installing the motor next week in it's original form with RX-8 rotors but with Hurley seals. Will then boost 0.5.
2. Next I'm building an RX-7 8.5 compression ratio motor for the car, which will be installed once I have the manifolds fabricated. Hopefully I'd be able to boost 1.5 bar with this installation. Here I'd like some pointers as to the best way to make an RX-7 engine replace the Renesis. Please, it will be the first time I attempt this and need some good clean advice on the pitfalls to avoid doing such a transplant.
....just for those interested we ran a 2 hour race this weekend and I managed to get the new Golf up to 5th overall (Qualified in tenth position) after 1 hour 43 minutes when sheared off CV bolts forced us to withdraw from the race. Not bad for a brand new race car, in it's first start. It's a pity as the car goes like hell, considering that we manage to beat some of the Porches out there. The suspension is also still very crappy and the car handles like a **** over 225 Kph. I'll lower the car another 30mm this week and spend time sorting the suspension for the next race on August 4th. Our next endurance event is a 3 hour race on 15 November.
Jeez, I'm buggered today!
Hopefulle we'd be able to race the RX-8 in that event as well.
I've been absent for a while from this board now and firstly I would like to say I don't like this idea of the discussion turning into a slanging match. Let's get back to business
1. I'm going to be installing the motor next week in it's original form with RX-8 rotors but with Hurley seals. Will then boost 0.5.
2. Next I'm building an RX-7 8.5 compression ratio motor for the car, which will be installed once I have the manifolds fabricated. Hopefully I'd be able to boost 1.5 bar with this installation. Here I'd like some pointers as to the best way to make an RX-7 engine replace the Renesis. Please, it will be the first time I attempt this and need some good clean advice on the pitfalls to avoid doing such a transplant.
....just for those interested we ran a 2 hour race this weekend and I managed to get the new Golf up to 5th overall (Qualified in tenth position) after 1 hour 43 minutes when sheared off CV bolts forced us to withdraw from the race. Not bad for a brand new race car, in it's first start. It's a pity as the car goes like hell, considering that we manage to beat some of the Porches out there. The suspension is also still very crappy and the car handles like a **** over 225 Kph. I'll lower the car another 30mm this week and spend time sorting the suspension for the next race on August 4th. Our next endurance event is a 3 hour race on 15 November.
Jeez, I'm buggered today!
Hopefulle we'd be able to race the RX-8 in that event as well.
07-09-2007 | 03:11 AM
#78
kevin@rotaryresurrection
iTrader: (3)
Joined: Feb 2005
Posts: 1,415
Likes: 57
From: east of Knoxville, TN
I too have thought long and hard about putting an rx7 block into the rx8. There's a few issues:
1) the intake manifolds for any of the previous rotaries are likely to hit the firewall in the '8, without modification. For most, this will be a pretty big issue.
2) none of the motor mounts will line up...you will have to do some custom drilling/tapping. I am not sure if the peripheral exhausts will interfere with the passenger motor mount adaptation, either.
3) the renesis front iron is thicker than the previous rotaries, and the front cover is not as thick. This isn't like the old rotary swaps...you can not just put the renesis front cover onto the old rotary and keep the stock crank trigger/omp/etc. You'd either have to rig the renesis crank trigger and pickup onto the older front cover, or go to a standalone engine management and abandon all the pcm-controlled electronics in the chassis that depend on it.
EDIT: Hurley seals?
From what I have heard from EVERYONE who has used them in the states on a turbo rotary, they die quickly under any boost at all. I'd suggest mazda oem, atkins, or ceramics. The rotary aviation seals are very hard and will chew up rotorhousings, but they will withstand a lot of abuse. The Hurley seals are just the opposite...they will not wear into the housings at all, but they are too soft.
1) the intake manifolds for any of the previous rotaries are likely to hit the firewall in the '8, without modification. For most, this will be a pretty big issue.
2) none of the motor mounts will line up...you will have to do some custom drilling/tapping. I am not sure if the peripheral exhausts will interfere with the passenger motor mount adaptation, either.
3) the renesis front iron is thicker than the previous rotaries, and the front cover is not as thick. This isn't like the old rotary swaps...you can not just put the renesis front cover onto the old rotary and keep the stock crank trigger/omp/etc. You'd either have to rig the renesis crank trigger and pickup onto the older front cover, or go to a standalone engine management and abandon all the pcm-controlled electronics in the chassis that depend on it.
EDIT: Hurley seals?
From what I have heard from EVERYONE who has used them in the states on a turbo rotary, they die quickly under any boost at all. I'd suggest mazda oem, atkins, or ceramics. The rotary aviation seals are very hard and will chew up rotorhousings, but they will withstand a lot of abuse. The Hurley seals are just the opposite...they will not wear into the housings at all, but they are too soft.
07-10-2007 | 03:58 AM
#79
Thread Starter
sas
Joined: Nov 2006
Posts: 51
Likes: 0
From: Cape Town, South Africa
Thanks for the input.
As far as the intake is concerned we'll fabricate a set and use Jenvey throttle bodies
I do not like the idea of cutting into the firewall at all, so I'll look carefully at the options.
I prefer the Hurleys as I'd rather replace the seals than the housings and side plates. They're too damn expensive to replace everytime something goes wrong, and besides, one invariably end up replacing the seals anyway.
As far as the intake is concerned we'll fabricate a set and use Jenvey throttle bodies
I do not like the idea of cutting into the firewall at all, so I'll look carefully at the options.
I prefer the Hurleys as I'd rather replace the seals than the housings and side plates. They're too damn expensive to replace everytime something goes wrong, and besides, one invariably end up replacing the seals anyway.
09-20-2007 | 03:46 PM
#81
BDC Motorsports
Joined: Nov 2006
Posts: 417
Likes: 1
From: Dallas, Tx
Were any of the seal springs flattened?
B
10-01-2007 | 09:20 PM
#82
Registered
Joined: May 2003
Posts: 1,382
Likes: 11
This forum is very nice from the standpoint that we have many people that actually get out there and try things for themselves regardless of what the general opinion is. We are also more open about sharing our results with others so that they won't waste their time trying the same things over again. That's how it should be. You'll find that the people that give the most advice will probably have practical real world experience to back it up too. What's really cool is that half the time it goes against what was always thought as traditional. I like that.
When you hit the 7 guys up, you have people telling you not to try something. If you don't give them one, they say you're full of crap. When you do give them one, they ask you for dyno charts to back it up. When you give them one, they say you faked it. You can't win. Most of them don't understand that a dyno chart is only a 2D representation of a 3D powerband anyways. Then you have the people that spout off plain old bad advice after it's been proven not to work. Just because you and six million other people couldn't make it work doesn't mean I can't! Nevermind the fact that I don't have any of the proper tuning aids or skills neceesary to make it work. That's a prevalent attitude in the 7 community yet people encourage them to try the same crap that's been proven not to work all over again. How about encouraging them to try something else for once! Take that bs auxiliary bridgeporting crap that gets tried over and over again with the same crap results. Give it up people. It doesn't work! Those that have tried it and say not to waste their time are typically the ones that are flamed. Why are the smart people not listened to more over there? Then the idiots become the forum experts and now everyone listens to their techno flotsam babbling and believe it to work that way. Not so here. We share for the betterment of the community. A very smart and respected rotary person said at Sevenstock last year that the worst thing to happen to the RX-7 was the 7 forum! I'm not going to name him but most know who he is. So if we seem different over here, don't think we take that as an insult. It's a compliment.
When you hit the 7 guys up, you have people telling you not to try something. If you don't give them one, they say you're full of crap. When you do give them one, they ask you for dyno charts to back it up. When you give them one, they say you faked it. You can't win. Most of them don't understand that a dyno chart is only a 2D representation of a 3D powerband anyways. Then you have the people that spout off plain old bad advice after it's been proven not to work. Just because you and six million other people couldn't make it work doesn't mean I can't! Nevermind the fact that I don't have any of the proper tuning aids or skills neceesary to make it work. That's a prevalent attitude in the 7 community yet people encourage them to try the same crap that's been proven not to work all over again. How about encouraging them to try something else for once! Take that bs auxiliary bridgeporting crap that gets tried over and over again with the same crap results. Give it up people. It doesn't work! Those that have tried it and say not to waste their time are typically the ones that are flamed. Why are the smart people not listened to more over there? Then the idiots become the forum experts and now everyone listens to their techno flotsam babbling and believe it to work that way. Not so here. We share for the betterment of the community. A very smart and respected rotary person said at Sevenstock last year that the worst thing to happen to the RX-7 was the 7 forum! I'm not going to name him but most know who he is. So if we seem different over here, don't think we take that as an insult. It's a compliment.
05-30-2008 | 07:27 AM
#84
Doppelgänger
Joined: Feb 2008
Posts: 3,192
Likes: 1
From: Florida
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