That's an excellent question. I think new rotor housings are some of the most important items I would start with in an FI application. Beyond that, in that boost range with a moderately sized turbo, cooling and tuning are your next priorities.

It's kind of funny that you asked this question at this time. I was a little upset with an engine swap I saw on the forum yesterday and I was discussing what would be required to have a reliable 500hp Renesis with our engine man Mr Engman. I thought he would have said that the shortcomings are insurmountable but I was very happy to hear him provide some hope. This would be for people going well beyond where you are talking about but I'm excited anyhow. I'll work out some pricing for you.

Paul.

 

It remains to be seen what the long term effects of moderate boost will be like on the Renny. The tiny apex seals are good at doing what they were designed for, which does not include boost. One of the first upgrades for those reaching higher would be to run deeper grooves with FD type factory apex seals. Unfortunately, there are other problems related to exhaust temps and their effects on the flat housings due to port location, shape and type. Some distortions that can occurr in this region can be terminal.

Paul.

 

I'm going to have plenty of help on the tuning and cooling front. I'm currently @80k miles and i'm trying to figure out what I want and how much$ i'll need for my first rebuild.

 

I'm gonna ride my motor till it gives up, but when I eventually rebuild I wanna do it right.

 

I think thats what most people are thinking.

 

^ +1

My plan is instead of getting a reman from Mazda, to make them cough up the dough so I can get a good quality one elsewhere

 

I would rather pay Paul 3K and know that it will work

than put my bet on Mazda for their crappy remans.

 

It's all apart now. Rather interesting. No huge surprises, some affirmations and some interesting observations. Let me know if I should post the pics and other findings here or not. I'm thinking of doing another thread for the autopsy.

Paul.

 

Post The Pics In Another Thread ~!!!!!!!!!!

LEmme Start the thread !!!

 

Please post pics and analysis, alot of people would love to see those!

 

https://www.rx8club.com/series-i-tech-garage-22/lets-look-expo1s-over-100k-renesis-motor-138402/

Post it in the link above, good area and lots of views

 

Alright. I'll be posting it over there. nycgps, you're one of my favorite forum people and customer (And you're a character )

Paul.

 

Our current pricing on remans is $2700 and caters to many new parts being installed. The additional core charge of $1000 will be returned based upon the serviceability of rotor housings after Mr Engman has opportunity to dis-assemble the core. In other words, we will ship an engine in advance of receiving a core, if we evaluate that the core has wasted rotor housings we will charge $300 each that will be deducted from the core refund. The customer is also responsible for shipping charges. We offer a one year unlimited mile warranty (From date of invoice) that covers parts only and does not cover abuse of any type, poor installation or failure due to components outside of our engine. There is ABSOLUTELY NO WARRANTY provided for forced induction applications (Turbocharged or supercharged) even though we may have some of the best solutions for these.

We will build engines with brand new rotor housings for $3700 if you request in advance for them, plus core. We would then, not have to factor your housing condition into the core refund equation.

Thanks again to all those who have bought engines from us and in advance to all those who are considering a 'Better Renesis Rebuild'.

Paul.

 

I'll pass on your offer, just this time though

Paul.

 

I understood you and your wonderful humor. By the way, Mazda suggested retail today is $728.75 each.

Paul.

 

Already waiting. Have you started dialing yet?

PT

 

Paul,

I was wondering - as far as wear on the rotor housings, what side of the housings sees the most wear? Is it pretty even overall or are there certain regions which typically exhibit the most wear?

Thanks!
-Dmitri

 

yum .. 2700 for a reman and 3700 with new housing ..... yummmm ....

 

All I can say is this is the sex. I don't think I need one yet but I sure do want one anyways, my car has on 10,000 miles on this (second)engine, and I worry cause Mazda's reputation for remans isn't good and who know if the previous owner treated her right.

So a huge thank you to Paul and Rick for providing such a service to us all, You two sirs are scholar's and gentlemen.

 

Hi Dmitri,

I've seen some interesting things on the housings but the most common is distortion of the spark plug region. The motor that I'm dealing with presently has chrome cut away on the edges of the rotor housings both sides of both housings.

Paul.

 

Here you go. An example of the common (With enough miles) housing situation.

Paul.

 

PT, is that housing a candidate for replacement?

 

It will be replaced. The flaking is too much although the shrinkage is minimal (Measuring at 79.99 mm) but the sparkplug distortion and cracking is way beyond the limit.

Paul.

 

Would the grooves, alone, dictate replacement of the housing?

 

Yes. There is too much missing. The other thing is a lot of builders aren't looking for the sparkplug distortion that I mentioned and will totally miss it. The apex seal will have to skip over this region every time it goes by which is neither healthy for compression nor for preventing gas leakage that could result in engine fatality.

Paul.