von

The only problem seems to be that 1 corner seal broke..

The very bottom of the corner seal where the rubber boot fits was cracked completly in half but the whole motor was unharmed..The effect of the corner seal breaking also broke the two side seals next to it. The 3rd one was fine. I will be purchasing solid seals so this doesent happen again. The idea was that the streetport was so big that the Corner seal sorta fell in the hole and the stress of it bending at an angle made it brake. Althouggh Jeff from autoteck told me that the heat might have caused it to brake. I really dont see how..

If you guys have any idea why it broke let me know. I used a mirror to check the surface area that holds the corner seal in and its about 2mm hehe or just 1mm over the rubber piece before it fals out.

BlackRx7

damn this was the godzilla port? if not I have a pretty big size street port and haven't had any problems using the corner seals with the rubber plugs...

von

We went to far for the stock retainers.

NZConvertible

An experienced rotary engine builder wouldn't have ported so big that the corner seals loose their support. I hope he's not going to charge you for this rebuild...

hypntyz7

I was about to say the same thing. You NEVER violate either the corner seal's orbit or the oil seal's orbit on the iron, I dont care what you do, those are the cardinal rules of engine building/porting.

This being an NA engine, never boosted/sprayed, still in breakin, and that CS having already broken once...I would not try and run this setup again. There is obviously something inherently wrong with the porting, or this would never have happened, especially so soon with little to no stress on teh CS. IN a stock/properly setup application, the CS endures very little stress...

Jimmy325i

I've gotta concur with everything thats been said above. How has that porting benefitted you when the motor cant even seat the apex seals before detonating itself?

I would agree with the heat problem causing the corner seal failure as an option though. If you ran the chamber temps so high that the seal expanded and then clamped onto the apex seal, it is possible that the seal would've cracked when the apex seal decided it was time to move.

However, based on what you have said about the port mouth being so large as to barely keep the seal in the rotor, I have to agree that this was most likely the culpret.


So was that rotor getting so hot because it kept getting fuel and never expelling any of it because not enough air was entering the chambers? I'm confused how this is related to the one rotor running so hot. Wouldn't a lack of compression lead to a rich condition as there isn't enough air to burn the gas. Or, is it possible that due to the insane overlap which must've been present, that the fuel was burned in the exhaust stroke rather than in the combustion chamber?

Barwick

who did this motor port job so we know to avoid it, no offense but it sounds like trouble.

KNONFS

iTrader: (14)

It wasn't the builders fault, VON was watching the builder and telling him to go lower\higer on the builders porting technique........

Barwick

oh

NZConvertible

The builder should've stopped before he got to the corner seal path, no matter what he was being told. He's either inexperienced or irresponsible.

Jimmy325i

No one has any thoughts on my ideas as to the excessive heat?

SonicRaT

iTrader: (6)

Well, he pretty much said he was running crazy advanced, so that's another factor to the list.

von

Yes my timing was sky high. But the rear rotor was the only one hot ? If you look at the compression numbers the front rotor was the one with low comp ( 1.5 1.5 1.6 )
So it must have been running richer making the header appear not glowing like the rear wich had higher comp.

That mixed with the timing and thier ya go..

I took the engine apart and yes the 2 apex seals adjacent to the corner seals were cracked evenly in half same distance down each one. This shows me that the apex side seals dug to far into the chamber as it was passing though and crack. Im guessing.

I did not wach the guy do the port. I did not say make it so big that the corner seal cracks along with 2 side seals

Im not getting warrantied but I think I know why. They charged me only half in labor because I built it myself under thier guidence. Another is they gave more discounts on parts like rotor housings , tranny labor , exc

Im gratefull yet im mad because they should give me something back alhtough I did take apart my own engine again and thier letting me use thier tools and shop...I will not be using the same housings. Ill simply use Nitroracers side housings from his engine. SHould only take me 1 hour to take them out. Then Duey the streetport guy will build another secret spec streetport but cant tell ya this one muawhahahah.

kep0ne

make sure you do it right this time...so this wont happen again.

SonicRaT

iTrader: (6)

I know this is off topic, but how the hell have you not been slaughtered by banzaitoyota with that long-*** signature? He's like the sig ****, and my god that thing's twice as long as usual! Back on topic, so you've decided the port was just too big? What are you going to be doing with your old side irons, junking them?

Jimmy325i

We want pics! How not to Godzilla port...

Jimmy325i

We want pics! How not to Godzilla port...

von

Lol ok smart ***. If you give me your email I can show them in its not completly finished version.

I dont know if solid corner seals will fix the problem or not so I dont want to junk the side housings just yet. That was alot of work.

Yes the sig is long but its clean , to the point , and performance inspired.

dr0x

Id junk the housings regardless if a solid seal will hold in place. Its obviously got problems and not something I would be willing to trust.

Jimmy325i

dumb site... someone want to delete the double post?

email me through my profile on here if thats how you want to do it.

KNONFS

iTrader: (14)

Really?

That wasn't my impression, I mean here's what you said:

"I had a guy do the street port but wached him and told him how far to go."

In this thread:

https://www.rx7club.com/forum/showth...ighlight=ports

von

LOl oh really? Yes I did at one point but he was expierienced one and told me it was ok. So I told him what I wanted and to go further on the left side because he made a small chip right thier but as far as the very top part with the corner seal I was not even present when he was grinding that. He should have known.

NZConvertible

Yeah but the point of the rule is so that we don't have to scroll through the same long list again and again, which is annoying as hell. Look at Jimmy's sig, it has as much info but takes up much less room.

More power to the sig-***** I say...

mazdaspeed7

Another "secret port" huh? Anyone wanna place bets on how many miles this one lasts...

SonicRaT

iTrader: (6)

$5 on 600! Did Jimmy ever get those pics?