Miata Turbo Forum - Boost cars, acquire cats.

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-   -   2nd Issue with my China charger (https://www.miataturbo.net/diy-turbo-discussion-14/2nd-issue-my-china-charger-33687/)

TonyV 04-07-2009 04:04 PM

No possibility that that c clip is in there right? WG still tightened up and all?

Cpt_Slow 04-07-2009 04:27 PM

fwiw, I emailed Dustin at emotors, asked if they recommend oil restrictions. Here is his reply:

"YES, DEFINITELY – WE WILL BE UPDATING OUR AUCTIONS TO INCLUDE THAT INFO – WE CURRENTLY DON’T CARRY THEM BUT THAT SEEMS TO BE THE PROBLEM – OVER OILING J"

Turbo_4 04-07-2009 04:48 PM

huh, wow crazy how that works^^^^^^^^^^

elderc 04-07-2009 04:51 PM

The instructions that came with my Garrett (journal bearing) called for a restrictor, I've been using a 1/8 pop-rivet(with the nail part removed) in the oil supply line fitting as a restrictor for two years.

m2cupcar 04-07-2009 04:53 PM

Ask him to explain exactly what over oil is. I bet he can't give you an scientific explanation. That's because there's no such thing as over oiling or over lubricating a bearing. AAMOF the less time a given unit of oil is actually inside the chra the better. If you must run a restrictor in a journal bearing turbo then there's either some kind of pressure build up in the oiling system or the seals are worn in the turbo.

I've read several times on the DSM forums that the eBay 16Gs aren't balanced even though they look like they are - and the turbine and compressor wheels are excessively heavy compared to a name brand turbo.

The instructions from Garrett? Because they're website says journal bearings do NOT need restrictors. AAMOF their engineers say that too. :dunno:

Turbo_4 04-07-2009 05:01 PM

Well everywhere I've read has talked about using a restrictor...especially with the egay turbo's. I've also been using the pop rivet.

elderc 04-07-2009 05:31 PM

m2cupcar,
I did'nt say the instructions were from "Garrett" I said the instructions that (came with my Garrett) the instructions were from the supplier.

Cpt_Slow 04-07-2009 05:32 PM


Originally Posted by m2cupcar (Post 392543)
Ask him to explain exactly what over oil is. I bet he can't give you an scientific explanation. That's because there's no such thing as over oiling or over lubricating a bearing. AAMOF the less time a given unit of oil is actually inside the chra the better. If you must run a restrictor in a journal bearing turbo then there's either some kind of pressure build up in the oiling system or the seals are worn in the turbo.

I've read several times on the DSM forums that the eBay 16Gs aren't balanced even though they look like they are - and the turbine and compressor wheels are excessively heavy compared to a name brand turbo.

The instructions from Garrett? Because they're website says journal bearings do NOT need restrictors. AAMOF their engineers say that too. :dunno:

I understand your argument, and cannot supply any evidence to the contrary. Everything pro-restrictor is anecdotal, but on that note I haven't heard anecdotal evidence of failures as a result of the restrictor.

levnubhin 04-07-2009 05:39 PM

So I got this response from the seller.....


That model GT28 should be the journal bearing type and in which case I would have no explanation as to what the noise could be, unless you were mistakenly sent a ball-bearing (of which we've stop producing) and those would be the bearings. As long as it works and makes boost with no smoke I would't worry, but if it gets to the point were you'd like to return it within 30days of original purchase I'll be sure to send you the correct type.
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Braineack 04-07-2009 06:37 PM

that's a pretty cool reply from the vendor. from what you described to me earlier it sounds like you have a BB turbo. needs more video of you spinning it by hand....

olderguy 04-07-2009 06:43 PM

The only reason I can see for a restrictor is to keep from blowing oil through the seals when the oil can't drain out fast enough and builds too much pressure in the bearing area.

paul 04-07-2009 06:51 PM

So if it is a ball bearing turbo and the problem was caused by too much oil pressure wouldn't you have oil blowing through the seals directly into the intake and exhaust? Got symptoms of that? Chalk it up to a piece of shit product then.

urabus 04-07-2009 06:54 PM


Originally Posted by m2cupcar (Post 392543)
Ask him to explain exactly what over oil is. I bet he can't give you an scientific explanation. That's because there's no such thing as over oiling or over lubricating a bearing. AAMOF the less time a given unit of oil is actually inside the chra the better. If you must run a restrictor in a journal bearing turbo then there's either some kind of pressure build up in the oiling system or the seals are worn in the turbo.

I've read several times on the DSM forums that the eBay 16Gs aren't balanced even though they look like they are - and the turbine and compressor wheels are excessively heavy compared to a name brand turbo.

The instructions from Garrett? Because they're website says journal bearings do NOT need restrictors. AAMOF their engineers say that too. :dunno:


I work with bearings everyday. Over lubrication is a leading cause of bearing failure.

levnubhin 04-07-2009 08:11 PM


Originally Posted by paul (Post 392615)
So if it is a ball bearing turbo and the problem was caused by too much oil pressure wouldn't you have oil blowing through the seals directly into the intake and exhaust? Got symptoms of that? Chalk it up to a piece of shit product then.

I did notice some oil in the inlet when I removed the airfilter to check for shaft play. Haven't noticed anything from the exhaust though.
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levnubhin 04-07-2009 08:13 PM


Originally Posted by Braineack (Post 392598)
that's a pretty cool reply from the vendor. from what you described to me earlier it sounds like you have a BB turbo. needs more video of you spinning it by hand....



I'll get a video tomorrow.
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m2cupcar 04-07-2009 08:24 PM

No lateral shaft play could be bb. How does it spin right now if you spin it by hand? And you gotta wonder why they stopped selling the bb turbos... ;)


Originally Posted by urabus (Post 392617)
I work with bearings everyday. Over lubrication is a leading cause of bearing failure.

Who do you build turbos for? Because two garrett engineers recently agreed (and so does Garrett officially) that journal bearing turbos don't need restrictors and would not over oil. I've yet to find any examples of a journal bearing turbo dying from over oiling. OTOH under oiling would seem far more capable of destroying a journal bearing turbo. As mentioned- if you're blowing oil past the seals, then there's an issue with getting oil out or the turbo has bad seals.

That said, please explain over oiling of a journal bearing turbo (and I'm not speaking of excessive pressure blowing oil past the seals). :hustler:

levnubhin 04-07-2009 08:28 PM

So yeah, I think I'm gonna go ahead and return it. The noise is getting louder, sound slike some juiced up electric car driving by. I just hope that they send me something with the same specs.
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paul 04-07-2009 08:31 PM

There is no such thing as too much lubricant. Trust me.

levnubhin 04-07-2009 08:34 PM


Originally Posted by paul (Post 392676)
There is no such thing as too much lubricant. Trust me.

Is that what she said? :laugh:
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paul 04-07-2009 08:39 PM

I was expecting "he"


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