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Old 05-02-2019, 03:21 PM   #43
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Originally Posted by projek_01 View Post
Fair enough, you have a stronger educational background (engineering) in this stuff than I do. Saying I have no idea about the tolerances and material specs however is incorrect and is very naive. Rockwell hardness measurements and micrometers were used to check the specs before reassembly. I also checked the alloy that Rotrex used with instrumentation I have access to just for my information.



I realized that I wasn't thinking right when I wrote that on my drive home today. What I meant to say is that those engines change RPMs very rapidly especially when people dump their clutches to launch into VTEC. The rapid change in RPM is rumored to be snapping the brittle hardened sun shafts. We know that hardened steel = brittle. Just a theory though and not a proven fact.

Either way, what's done is done and I am confident enough to run this blower. I will run some nylon filters on the hot side pipes before the intercooler for some added protection. Best of luck to me!

No more arguing on my end - what's done is done. I wrote this thread to help people understand what is potentially happening inside their blowers.
The higher RPM engines do not change the rate at which the RPM changes on a Rotrex, but a more responsive engine, e.g. one with a lightened flywheel, full WPC, etc, can have faster transient changes.

However, these "normal" rapid transient changes are not what makes the sunshaft fail. It's sudden rotational impulse that causes the failure, such has a hard shift causing a large rpm change in a very short amount of time, or bouncing off of the rev limiter, where you're making a lot of back and forth shock load.
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Old 05-02-2019, 03:27 PM   #44
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Doesn't HKS do something akin to a sprag in theirs? I've seen twin scrolls yank the accessory belt because of a clutch dump.
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Old 05-02-2019, 03:44 PM   #45
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Thanks for this thread projek_01. Always nice when someone tries to help out the community by showing what is going on inside a unit.

Here's hoping your unit outlasts the one belonging to the Simpsons character from upstate NY.
Iíll second that!
Great job and thanks for sharing.
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Old 05-02-2019, 04:33 PM   #46
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Here's hoping your unit outlasts the one belonging to the Simpsons character from upstate NY.
That would be awesome. But I would still not take that risk of boosting with that rebuilt compressor.

I cannot offer wishful thinking, sorry. It is not honest.
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Old 05-02-2019, 08:55 PM   #47
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Thank you for documenting this. Very helpful and I wish more appreciated what you did. Please keep updating
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Old 05-03-2019, 08:51 AM   #48
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That would be awesome. But I would still not take that risk of boosting with that rebuilt compressor.

I cannot offer wishful thinking, sorry. It is not honest.
As an outside observer, I understand your perspective, but - poking holes (especially hypothetical holes) in someone else's research is easy. Let's see how it plays out in real life. Can't count how many times I've been surprised by positive outcomes with negative predictions And I don't think he's spreading misinformation, just expressing his opinions (which sound pretty darned educated to me). Kudos to projek_01 for your exploratory work, it's fascinating stuff, I don't see anybody else providing this kind of info.
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Old 05-03-2019, 02:56 PM   #49
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Let's see how it plays out in real life.
It is going to be fun and gain either way, right?
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Old 05-03-2019, 03:21 PM   #50
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The blower has been installed and idled without any issues. I hooked up some temporary clear PVC tubing to the oil return line to make sure there was oil flowing before I let the engine fire up. I just need to make a nylon filter pre-intercooler in the event that mrg666 has a crystall ball and can see the future of it blowing up.

The noise is a bit different because the Rotrex is blowing into atmosphere. The bearing/grinding noise is definitely gone however!

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Old 05-14-2019, 01:02 PM   #51
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Built this filter to catch any exploding bits in the event my rebuild was a bust.




However..... I don't think I needed it. Hitting boost without any issues!! Revving to around 6k rpm for now till I change the Rotrex fluid after the after rebuild "break-in" period.
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Old 05-14-2019, 01:56 PM   #52
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That’s clever
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