if so how much hp gain is it? i got someone that says they will do it for me for 3000 and i need to know if its worth it

 

Spending $3000 to port a renesis is definitely not worth it. If the engine were already apart due to some other failure then you could begin to think about it. The renesis is incredible port timing in stock form and not much can be accomplished. Lack of knowledge and experience porting can do great damage to your engine through increased wear of seals.

Paul.

 

Listen to Paul, he's a very valuable member of our Rotary Community and know his stuff!

With that said, $3k for a porting job is crazy. I would imagine most of that cost is going towards the labor to remove / reinstall the engine. Definitely not worth it if your engine is good working condition.
I know of two members here who have ported their cars (there's probably more). Phil's8 was ported after he blew his 1st engine. (4 port supercharged A/T)
Charles R Hill rebuilt his engine and had it ported while it was out. His dyno figures were quite impressive. (approx 213 hp), second closest to him that day on the dyno was mine at 203. 10hp for 3k. you decide...

 

Listen to Jedi. The force is good with him it seems .

Paul.

 

Definitely not worth the money or the trouble of pulling the motor.

In addition to the two jedi mentioned, I believe there is a BB turbo 8 that had his motor ported. Also there is someone on rx8web.com that had his motor ported but no details yet.

 

There is a video on youtube of a ported renesis. They claim 263bhp.http://www.youtube.com/watch?v=LkKw7...eature=related

 

Here is the video of the engine on the dyno.http://www.youtube.com/watch?v=KQL45DYgIFw

 

That is a custom peripheral port engine. It's not really a Renesis. It did start life as a reny.


Didn't guitarjunkie28 & Judge Ito do some engine porting?

 

jedi AGAIN! how am i supposed to hit 3k post with you on this sh*t all the time

 

Well the thing is with both Ray and Phil, they had the motors out already. If you have the motor out of the car and are having someone work on it, it seems silly to NOT port it. I'm already budgeting for a future rebuild when my engine gets old enough or I blow it to pieces with boost, and when it gets rebuilt it gets all the goodies. I would also imagine the porting Ray had done will be more than 10 HP with a FI 8.

 

correct.

and ray is the only one i know of that has a ported engine running..

but paul.

i have a spare motor. and your guy is the one to do it.

beers

 

Pettit seems to offer some porting services along with other reliability mods...


I've been looking as my engine is about to **** the bed any month now. No reason not to port the engine if its being rebuilt or replaced. I wish there were more options out there

 

port --- yes, if your current engine is bad and gonna have to take it out "any way"

but 3 K for a port job? oh hell no.

 

Phils8 is running. The porting I did on that one wasn't that much of an increase in volume. They are larger but more than anything it was a smoothing of the flow through the port. MAzda leaves some shrp right angle cast points in the ports.
As was stated if your going to do this the gains for the cost are not the greatest. If you have the engine out being rebuilt. Then it would be more cost effective.

 

I like these posts.

After college if I still have my 8 and can afford a daily driver. I'm considering getting a rebuilt renny then porting it. Then FI. So that's make take. I would not have the engine pulled out just to get ported. But if i plan to get a rebuild because of my 8s age. Then i see as a minor amount of money.

Just my $.02

 

re- read the post above you - this man speaketh the truth .
FI adds so much to this engine without any other mods .
On the other hand if you were thinking of building the badest FI 8 out there then porting would help you get there .

 

If someone isn't a rotor head then I would never drop my car off with them. Specially if it was along the lines of a 3k dollar job.

Just use that 3k to go towards some boost and you will be much happier.

 

people only care about peak hp because that is what has the wow factor - something you call skite to your mates about . In reality increasing the midrange torque would make the 8 much better drive than just adding 10-15 at the peak .
How much mid range did you end up getting ?

 

Don't forget Racing Beat can do porting.

 

Absolutely. Jim Mederer is one of the sharpest men EVER in the rotary game. He ranks among a VERY small group of builders . He doesn't do most of their porting any more but I'm sure has evrything to do with their design.

Paul.

 

Paul - Can you order from Mazmart a renny with any kind of porting?

 

Rick has done a lot of port experimentation on these motors and can definitely provide that option. One of my issues with it is that the stock ports are HUGE already. These motors make 250 to 260 flywheel hp without port work and I've even heard of more. I hope to be introducing some really neat internals soon, like some new seals for the renny that people should find beneficial.

So yes, we can. More to come......

Paul.

 

^^^ tease.

 

His seals will make the renny run cooler like the pump and thermostat.

Mu ha ha....

 

wait what.

i'd like to see a dyno or a video. with accepted calculations, the 04-08 renesis engine makes ~215hp at the flywheel. i would love to see evidence otherwise.