As the title says,
I would like to know all the possiblities for a blow by???
I have a new build engine !! it is Street Ported and pined!! the first three week it wasn't smoking but about month or 6 weeks later, it starts to smoke a little.

Whats even more wierd. I have a GT40 .88 A/R that made 284@16psi.. Not Normal AFR is 10.3-11 no matter how more boost i increase, still richer it get or about 5hp/psi increased!!!!!

also blow by.. what can causes it?????????????
any inputs from the pros.

 

what causes blow by...um...worn oil rings in a piston motor.

Rotaries naturally have "blow by" since there's no way to keep oil out of the combustion chamber. it's just the nature of the motor, in my experience.

 

Are you sure it is oil smoke? Define, "smoking a little"
When you first got it rebuilt it did not smoke at all?

 

less than 300 rwhp? Something is very wrong with your setup or engine.

 

yeah, it is bluesh smoke. when i first start it when its cold it doesn't smoke. but after i drive it around and start it again it smoke like crazy for 1 or 2 min then it keeps on smoking a little.
when i first rebuild it, it didn't smoke at all !!

My set up is 100% right. enough fuel 1000/1600 Aeromotive. -8 lines everything is right !!

 

^ nah man something is defenatly wrong , 16psi ...dude you should be makeing a lot more power ,
are you pre-mixing? if so are you using too much ?
is youre timing right?
is youre turbo ok?
are all your`e plugs firing?

 

Denial, it's not just a river in Egypt. There is something VERY wrong with your setup, given you are making about 130-150 rwhp less than you should be.

The oil smoke is most likely because you need a restrictor in the oil feed line to the turbo.

 

Hahahaha....oddly enough, that's the second time I've heard that exact statement today. The first time referencing Ron Santo again not getting into the hall...

/offtopic

 

I am wondering if by not having a turbo inlet oil restricter could couse that blow by ?!?!?

 

How many miles are on the turbo? Any shaft play? Oil residue in the housings?

 

it is about 3K and it has no shaft play nor oil leak !

 

Who built the motor? It wasn't that hack shop Fuego Racing was it? If so, I'm not surprised your FD is jacked up

 

!! why is that?

 

Because he's an incompetent buffoon, that's why:

https://www.rx7club.com/showthread.p...ighlight=fuego

and

https://www.rx7club.com/showthread.p...ighlight=fuego

and

https://www.rx7club.com/showthread.p...ighlight=fuego

and

https://www.rx7club.com/showthread.p...ighlight=fuego

Seeing a bit of a trend here?

 

Yeah, I have looked at them before..
I know some of the people who responded. and know this story. I don't want to get in to it.

This Thread is to know the causeings of the blow-by ?

 

What's your description of blow-by?

Blow-by is normally the result of-->

Excessive side seal clearance or weak side seal springs. Same for corner seals/springs.
Out of spec side housings from high mileage etc. Side housings that have not been surfaced/lapped properly.
Bad or worned out oil control seals and springs.
Extreme case of blowby resulting from-->
Cracked rotor or from out of spec bearing clearances causing the tip of the rotor to come in contact with the side housings resulting in the corner and side seal getting stucked.
Too rich a fuel mixture causing oil wash/break down from side housings etc.

 

That h/p # is not very good i just did 420 hp on 14 lbs. something must be wrong with tune!

 

and you have GT40 turbo ?

 

your #'s are terrible, people make more power on stock twins with LESS boost. I don't mean to be rude but seriously a single turbo making under 300hp AT16 PSI???!?!!?!?!!!?!!eleventyone!!

 

Hey Thanks Crispeed

As much as it sound bad, it the best input sofar

 

Since your car doesn't smoke right away and then starts, I would wager on oil restrictor pill, but it could be something wrong with the motor as Crispeed went into.

You still seem to be an ostrich with his head in the sand about your setup, something is SERIOUSLY wrong for you to be making such low power. I would check the ol' compression.

 

I beg to differ. My input was extremely relevant----you had a shitty mechanic touch your car, and he fucked it up. Bring your car to a *real* rotary shop, like Pettit.

 

Turbonetics 62-1 just tunned this last weekend by Steve Kan.

 

quick question. how hard is it to rebuild 13b engines ?

I would realy like to learn how to work on the engine. were I am from, when I finish my Degree, we don't have rotary engines therefore i must know how to work on it in case something happens.