Overlap can be good or bad. It depends on the situation. The more and more I see, the less and less I think it's important.

 

To the OP (PhilipSA)

Any updates on those pictures that you were going to try and get of what you saw when your plates where ported?

How is the car driving?

Thanks.

Chris

Wrong Thread...Ooops

 

I wonder if anyone here has any specs for valve timing and overlap in F1 engines of the last 5 or 6 years. Max power at 19k rpms. That would be interesting, not totally relevant to overlap in a renesis but interesting.

Paul.

 

I don't know the current engines(rules change every year and they might have eliminated variable valve timing) but up to a couple years ago their timing varied...their overlap did too I assume. They have Pneumatic Valve systems which allow much higher RPM operation which is the limiting factor with say, a Honda. They can also control how much each valve opens and for how long which is pretty crazy. I imagine they have a healthy does of overlap to maintain their tq over such a broad rpm range. I do know that they only have 200 ft/lbs if that....they just hold it up to 17-18k rpm before it slowly depletes.

Pretty amazing stuff....I will look in a few SAE papers I have from when I was part of the Formula SAE Competition in College...they have lots of good info on valve-train design from F1.

Best regards,

Chris

 

Hello Rotor Heads,ill try and make this plain&simple lol as its all about Reaserch ,trial&developement will come.......1st theres the 6port 2nd is the 4port ,BP can be done respectfully to both Rene versions ,but very limited! The 6port can be BP in the (primary)mainly& secondaries but will need to control the Dynamic air chambers,on the 4port i can see good timing in the primary ports only with exhaust porting left alone or a polish or airflow blend,I can see good results with a fully built 6port RENESIS (Mild SP-polished) ,semi PP,E85,with Microtech fuel & crank trigger controled & good #s will follow ....Coming soon guys patience im a strong believer in the Renesis . Mazda did their homework ,now its up to us to do the same! Cant wait to get my hands on a 16x: thats where is @. More to come

 

/\ 1st post . hmmmmm you sound like you know some stuff

 

bumping this for a non-BP question

ignoring the extra seals added for addressing the exhaust side port, are the corner and side seal positions the same between Renesis and 13B rotors?

 

The Renesis has side seals that are way farther out on the rotors. That is why the stock ports go so far out, because the side seals allow them too. As for the corner seals, I assume they are farther out also in order to match the side seals properly since they seal against each other.

Chris

 

They didn't seem that different looking at pictures between the two

 

^ that is because both of those rotors are from the renisis.

 

Team for some reason those rotors look the same. They both look like Renesis rotors.

Here's a 13B REW

 

Do you guys mind spelling out the differences in the rotors for those of us who cant tell by the naked eye? What exactly are we looking for?

 

Never trust the interwebz

It looks like the corner seal positions are the same, just that the side seals hit them further out due to their further out position

What I'm really gunning for is this, regardless of the side port sealing issues if 13B rotors were paired with Renesis irons would the 13B corner and side seals fall into or hang up on the Renesis port openings

 

I wouldn't say the side seals are WAY out farther than the 13B seals but they are outwards a small amount. About 3mm. It's deceiving since the side seal grooves for the Renesis are much larger due to the wedge shape of the seals. The corner seal locations are the same. The apex seal grooves obviously aren't as deep.

With 13B rotors in a Renesis, the apex and corner seals aren't going to be an issue nor are the oil control rings. You might have longterm issues with the side seals though on the closing edge of the intake ports.

 

So to make the story short. Is it possible to bridge port a renesis ? If yes who have done it and gained X power?

Sorry that I cannot understand your tech conversation but my conclusions if I understood correctly is that a renesis will have issues if some tries to apply bridge porting. Is this correct ?

 

There's no hard data to make statements yet. The only bridgeports that were "tested" were made by some random guy with no experience or knowledge on the subject.
The other bridgeports are still in the works so there's no real data available yet. It can be done, the only concern is how effective will this mod be in our case

 

I'll agree that what is being experimented with here is porting, but isn't calling it bridgeporting a misnomer?

 

Considering that a bridge port is defined as an addition "eyebrow" shaped port above the primary port, creating a "bridge" of metal between the 2 ports, I don't see why the terminology is wrong no matter how small the port actually is.

My Iron



rotaryPilot,
You're not going to find a quick, or simple answer to your inquiry any time soon. This stuff is too new and untested. All you'll get are theories till my motor proves or disproves them.

 

Hate bumping old threads but this one was too good of a read to pass up. Obviously people have done porting on the renesis now. What was the discovered best way to do it?

 

PPRE Port.......................

I'll leave the rest up to you

 

do not want ....

 

You've really lost it. He asked for opinions and that's mine. The same might be said for the person posting such nonsense.

 

How does that justify calling me a douche?

It's not just my opinion. It's also the opinion of professional race engine builders that you have no comparison too. I trust their judgement and experience over your own. Regardless, that's no excuse to lash out and call someone a douche. I have nothing to gain or lose so my opinion is without bias, personal gain, etc.

I would not recommend anything more than a light cleanup port job on a Renesis.

 

As fun as it is to troll/flame people on teh interwebz.. some people use these forums for purposes other than that.
Thanks for the constructive reply Slidin.

 

It was actually VERY constructive.

If you did a bit of research you will find out the reason for my answer. I'm not gonna do all the work for you