I'm a rotary rookie.
12-26-13, 07:18 PM
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I'm a rotary rookie.
Okay, the title says it all. I'm completely new to the rotary cars, but earlier this year I bought a 1988 RX7 Convertible. The car hasn't ran in 2 years and the last time it ran it was pluming white smoke everywhere so it was burning coolant. I'm getting ready to pull the engine and rebuild it (I'd like to do it myself.) Really I've got two questions 1. Where is the best place to find a rebuild kit (my car is stock so it's a non-turbo model.) 2. I want to get a little bit of extra power from it after the rebuild and was curious about some light mods, any recommendations?
12-27-13, 07:02 AM
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I've had good luck with Atkins rotary, but there are several places that make good rebuilds. I would first start by watching the several rotary rebuild videos on YouTube to see if its something you're up for.
12-27-13, 07:24 AM
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Oh, absolutely. I don't want to bury myself in a giant headache before I start. I've been pretty good about checking YouTube and the ready of the internet for "how-to"on plenty of stuff. My big reason for wanting to know how to do it is, I just love getting my hands dirty and doing things for myself. If I'm not really up to it myself my next task is finding a pretty decent place to do it.
12-27-13, 09:07 AM
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I am in the middle of rebuilding the engine from my 1993 rx7 for the first time. It can definitely be a little overwhelming at first but if you have the patience and the tools to do the job it, is definitely a task you can handle. The hardest part is figuring out which parts you need and which rebuild kit to order because there are a few different ones out there. I personally went with the kit from www.rotaryaviation.com. It fit my budget and I am pleased with the quality of the kit. You can find the mazda factory shop manual online for free which also helps guide you through the rebuild process. Hope this helps!
12-27-13, 10:37 AM
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I tend to buy Atkins rebuild kits as they are a convenient, complete kit. However I specify factory corner seals when I do as I don't believe the solid corners are superior in low HP applications.
If you are looking for a little power, then a mild street port can be performed while the engine is apart. The key word is "mild" as if you go hog wild with the ports and add a lot of overlap, you're going to shift your powerband up too much and hurt your drivability/low end. I'd recommend the Mazdatrix 6 port street port template on the intake and keeping the exhaust stock.
You may have seen these already, but here are some of my videos on rebuilding a 13B.
These videos will help you in the process of rebuild a 13B or 12A engine. While they deal with an older 13B from an RX-5 Cosmo, the engine internals are basically the same for any 12A or 13B. The only real difference is that on engines newer than '85, the coolant O-rings are in the irons instead of the housings as shown in this video.
The first video is engine removal. While it is an RX-5 Cosmo, an car that few will ever see let alone work on, the process will give you the general idea of an engine removal. Steps are similar for most rotary vehicles, it's the details that differ.
The next video is engine disassembly and some cleaning. This is an old carbureted 13B so the accessories bolted to the engine are different than newer engines. However the process of externally disassembling any rotary is about the same. Covered here is also flywheel removal (same for any rotary) and engine parts cleaning.
Cleaning of all engine parts continues in this video. Provided here are examples of how this is accomplished with a minimum of tools and supplies. It's a lot of labor to clean old parts until they are looking new again. At the same time, parts should be inspected.
Finally, here is the engine assembly. This video includes clearancing side seals, assembling all the seals onto the rotor, then assembling all the parts into a 13B short block.
If you are looking for a little power, then a mild street port can be performed while the engine is apart. The key word is "mild" as if you go hog wild with the ports and add a lot of overlap, you're going to shift your powerband up too much and hurt your drivability/low end. I'd recommend the Mazdatrix 6 port street port template on the intake and keeping the exhaust stock.
You may have seen these already, but here are some of my videos on rebuilding a 13B.
These videos will help you in the process of rebuild a 13B or 12A engine. While they deal with an older 13B from an RX-5 Cosmo, the engine internals are basically the same for any 12A or 13B. The only real difference is that on engines newer than '85, the coolant O-rings are in the irons instead of the housings as shown in this video.
The first video is engine removal. While it is an RX-5 Cosmo, an car that few will ever see let alone work on, the process will give you the general idea of an engine removal. Steps are similar for most rotary vehicles, it's the details that differ.
The next video is engine disassembly and some cleaning. This is an old carbureted 13B so the accessories bolted to the engine are different than newer engines. However the process of externally disassembling any rotary is about the same. Covered here is also flywheel removal (same for any rotary) and engine parts cleaning.
Cleaning of all engine parts continues in this video. Provided here are examples of how this is accomplished with a minimum of tools and supplies. It's a lot of labor to clean old parts until they are looking new again. At the same time, parts should be inspected.
Finally, here is the engine assembly. This video includes clearancing side seals, assembling all the seals onto the rotor, then assembling all the parts into a 13B short block.
12-27-13, 10:27 PM
#6
Welcome to the wild, wonderful world of RX-7s! Nothing to add to the excellent rebuild advice. However, before diving into a rebuild, it may be worthwhile to spend a little time confirming a rebuild really is needed. There are threads posted from time to time about guys getting cars practically for free that turned out to be only severely flooded. A badly flooded engine will pour out plenty of white smoke for quite a while.
My advice is to check out as much as you can while the engine is still in the car. Search out some of the threads about bringing back to life engines that have been sitting.
Good luck with the car!
My advice is to check out as much as you can while the engine is still in the car. Search out some of the threads about bringing back to life engines that have been sitting.
Good luck with the car!
12-28-13, 01:50 PM
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I definitely appreciate all of the great advice. I'm definitely going to check the engine out before I pull it, I already wanted to do so. More so now that I have something specific to look for. If it comes to a rebuild I definitely have some excellent advice to fall back on (and I'm sure somewhere down the road I will need a rebuild.)
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12-29-13, 11:07 AM
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It may be a good idea to check out some texts written on the RX7s. I have read two or three books and they have assisted me greatly.
is pretty good from the performance standpoint and it goes through the FC series too.
12-29-13, 12:26 PM
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Sorry, I know I'm a total newb here, but I thought I would share my experience. My engine was acting similar, so I tore it apart and found that all but one of the irons was reusable, and to buy new ones would have been prohibitively expensive. So instead of rebuilding I bought a complete pullout for far less money, and i could hear it run first.
02-24-14, 03:06 PM
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Well, I finally had some time to start screwing around with the car and the engine is totally locked up. All in all, this is a project car so anything that could make it loads of fun is going to become an option. If that means a newer generation engine, a turbo. Literally anything is an option now.
02-26-14, 11:29 PM
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Definitely not scared! A junked up convertible that is literally nothing but potential now? I call something like that paradise. Being my first RX7 I'm still thinking rotary, but I've got a mind very wide open and ready to have something none of my buddies have and every one of them want.
04-04-14, 10:37 AM
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Alright, I've eliminated any off the wall swaps and i'm keeping her as a rotary. I'll probably still break the budget doing this anyway. I'm considering going turbo and all that fun stuff. Any opinions? Should I just find a new 13b and street port it?
04-04-14, 06:10 PM
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Haha you're absolutely right. I've been trying to get a little work in each evening to get ready to pull it. Eventually just gotta set the tools down and get ready to pull some ot so I can start a solid build. Gotta get that coin together
