gentlejax2

besides the car sounding like ****, what else is going to malfunction if anything on my NA. I am thinking my gas mileage suck suddenly but I have only driven it 1 day.

the car is a NA AUTOMATIC with Borla cat-back & Bonez superflow from manifold to catback.

cant get the flanges to seal at either end. looking for copper now.

Aaron Cake

iTrader: (1)

The idle will be a bit rougher, but that's about it.

If the gasket has been blown out for a while, have the manifold resurfaced before you reinstall. That way it won't happen again.

You don't really have to wait for copper gaskets. In an NA application, the stock Mazda gaskets are fine. They're pretty well made, and leaks between the engine and manifold are rare.

SDrotary-FC

yea i have'nt had any trouble with the stock gasket

Mr. Gadget

oh, and if you have a fuel leak - look out

gentlejax2

well all th gaskets are new and I just installed my Bonez system the other day and have had leaks at both ends from the very start. had problems with 1 of my manifold studs. got it out and replaced Sunday and re-installed and both ends still leak and sound like ****.

it is all new stuff. Installed one of my vert with no trouble but this time it is pissing me off.

I am going to have to take it to a muffler shop and have them fix it. pisses me off that I should have to take a bolt on piece to the shop. I think the nimrod who welded it together was hung over that day because it is off in the fitment department.....

Aaron Cake

iTrader: (1)

There's no such thing as "bolt on". Odds are your flanges are warped, or you used the wrong gaskets. All the Bonez pieces I have seen have first-rate welds. I guess it's possible that yours has leaks, but I doubt it.

Remember that most of the FCs are now quite old, and exhaust leaks and poor work by other shops have warped many of the flanges by now...

gentlejax2

Ok, well my Borla was BOLT on and it .....bolted on....

as far as the gaskets...they are the ones supplied by Rotary performance with the BONEZ kit..

the leaks are not coming from the welds it is coming from between the 2 flanges and has since the 1st minute I put it on.

the old exhaust was not leaking anywhere before I took it off.

the BONEZ when attached to my manifold sits right against my transmission pan . I mean the is not a hair's worth of space between it. I believe the unit itself was off specs by a little.

my other Bonez fit fine and wasnt touching anything when it was done. this one is in a bind. no way it should be jammed up against the transmission fluid pan.......

it is not leaking at the welds....never said it was.

it is pretty hard to get a good seal between the flanges when you have to jack the car up literally just to get the flanges to meet . I had to put a jack under the Bonez and force it to meet with the other end and the other end was not connected to anything.


jsut because the Bonez stuff is good doesnt mean it cant be off the specs. is it not welded by a man?????????????????????

Aaron Cake

iTrader: (1)

I stand by the fact that if it's not leaking at the welds, then the flange is warped (probably) or the bolts are under/over torqued (probably true as well).

With exhaust systems, it's luck as to whether it's a direct fit or not. But it does sound as if something is weird with your Bonez cat/pipe. It shouldn't be that close to the transmission.

White 87 13B

Don't weld...hehe

zabo21

I have a 90 NA and I just installed a Bonez Superflo the other week also. Everything was fine, no leaks or anything up until yesterday.

Like yours, my car began to sound like s**t. However, I also realized a drop in torque and overall acceleration.

I'm not yet sure if this is due to a leak at the Bonez Superflo's flanges, but it is very possible. I am actually leaning towards it being a cracked manifold

scheistermeister

couldnt you just use gasket sealer with the gasket to seal it up? or would it burn off?

gentlejax2

I could see the idea of being overtightned but since I had to damn near break the stud just to get it to join with the flanges- I dont think I had a choice.

I mean it took a lot of effort to get it to match up at the manifold and yes that was partly due to the fact that the tranny is in the way somewhat.

that is why I am going to toake ot my buddy at the muffler shop sooner or later. I will have him cut off the flange and re-weld it and adjust the bends of the Bonez to get it off the tranny and then adjust the end to meet my Borla without having to put it into a bind.

the leak is there at the flanges but it was even worse the 1st time I installed it. I couldnt remove it casue one of the studs got messed up and I had to take a air wrench and get it out . nut would nt come off but the stud came off attached to the nut still. then I had to remove the stud from the factory exhaust and put it back on the manifold.

then I had to re-install it all again. and now she leaks.

I will get it fixed one way or the other. I dont believe it is entirely my fault when the pipe is jammed against the tranny which is causing the whole thing to be off.


not a suprise Rotary Performance has not emailed me since I told them of the situation.

Like I said, even if I had messed up the flanges somehow, that doesnt account for the pipe jammed against the tranny.

my other one wasnt like that...I could have gotten a "dud" ....so to speak.

anyhow ......it will have to stay like that for the nest week or so.

Mike


I have seen no gasket sealer that can stand the heat of the rotary