forged internals in!!! still smoking - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 04-03-2007, 09:15 PM   #21
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do a compression test, then again after it's broken in
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Old 04-03-2007, 09:19 PM   #22
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80 psi oil pressure currently
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Old 04-03-2007, 09:37 PM   #23
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Was it doing the same before the rebuild?

do you have an oil inlet restrictor?

so to clarify: the pcv is normal, however the breather line on the driver side it just a filter?

Does it happen at idle? driving? boost only?

80psi compression? idle oil pressure? or in boost? should only be like 30psi when warm and idling.
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Old 04-03-2007, 09:45 PM   #24
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your always gonna get more than usual blow by on a fresh forged piston build.....you MUST return your PCV/breather setup back to stock operation to get those blowby gases out of the block properly....i know many guys whove had smoking problems with the filter on the "breather" and smoking went away when they ran a hose to infront of the turbo.
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Old 04-04-2007, 12:28 AM   #25
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so just run some tubing from the breather to the front of the turbo....
behind the maf right??
thanks again
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Old 04-04-2007, 12:32 AM   #26
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Was it doing the same before the rebuild?
before the rebuild it was huge ammounts of smoke do to bad piston rings

do you have an oil inlet restrictor?
not sure

so to clarify: the pcv is normal, however the breather line on the driver side it just a filter?

yes breather has a filter.. not sure about the pcv
Does it happen at idle? driving? boost only?
revving not at idle and under boost

80psi compression? idle oil pressure? or in boost? should only be like 30psi when warm and idling.
ill have to ask the engine builder about the specifics on compression and oil pressure.. my gauge is shot...they said it looked good though after the rebuild
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Old 04-04-2007, 01:40 AM   #27
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You didn't even have the stem seals and guides replaced in the head? I would do the stem seals with the head installed.
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Old 04-04-2007, 01:42 AM   #28
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yeah , after the maf but before the turbo, you can see how i did mine on my cardomain site. My BOV line and pcv hose are attatched to the elbow into the turbo.
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Old 04-04-2007, 12:38 PM   #29
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there has always been a big debate on how to treat a freshly rebuilt or brand new engine. Once it has warmed up and idled at operating temp. a couple of times, all is fair game (that's just my opinion). I have gone to school for building racing engines for NASCAR, and that is how we did it before we made dyno pulls. Break it in on how you think you will treat the engine for the rest of it's life. If you're going to drive it like grandma on Sundays before church, break it in like that. But, if you plan on beating the **** out of it and driving it like it was meant to be driven, whip it's *** from the get go!
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Old 04-04-2007, 12:50 PM   #30
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Quote:
Originally Posted by 4sfed5 View Post
your always gonna get more than usual blow by on a fresh forged piston build.....you MUST return your PCV/breather setup back to stock operation to get those blowby gases out of the block properly....i know many guys whove had smoking problems with the filter on the "breather" and smoking went away when they ran a hose to infront of the turbo.
No smoking on my freshly rebuilt 1.6 with a breather filter on the breather nipple. All rerouting it does is fill the IC with a nice film of oil from oil mist blowby.

Frank
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Old 04-04-2007, 01:06 PM   #31
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Ok I keep hearing people saying you must route the driver's side valve cover vent pre-turbo or else all hell wil break loose. I'm not denying it, but I don't really see the big deal. I certainly could be missing something.

If the intake manifold is connected on one side, won't this provide vaccuum, except underboost when the PCV valve closes (or it should)? What's the point really of having another vaccuum source sucking on the VC? Is this only an issue under boost?

Due to changes in my piping I had to install a filter on the driver's side. I guess I'll see if it causes any problems.
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Old 04-04-2007, 01:39 PM   #32
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The filter will only be an issue if you get too much crankcase pressure. Then you'll find oil in your engine bay, maybe on your turbo, and if it's hot maybe some fire. Running it to the intake tube, encourages the gases in the cc to be removed (vacuum) and reintroduced to the combustion process for emissions purposes. It also provides a good avenue to catch any oil that might get by the cam cover vent chamber. There are plenty of turbo'd cars that just run that vent line to a can with a big filter on it. After all it is crank case PRESSURE, so it will find a way out.
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Old 04-04-2007, 01:56 PM   #33
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Too much crankcase pressure can come from what? Faulty PCV valve? Blow by on the rings?

When routed to the intake tube on my car I saw no evidence of oil anywhere in the intake or IC piping. So I would assume I should see nothing coming out of the filter. I've pretty much shut the door on emissions at this point, so that isn't an issue.

Someone said something about helping the rings seal better and helping the turbo drain. Is this also an issue?
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Old 04-04-2007, 03:11 PM   #34
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yes, blow into the breather port why idling....then watch the exhaust.
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