dieselguy86
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Post by dieselguy86 on Feb 9, 2024 21:58:46 GMT -5
My friend has a class-winning tractor, I believe they have an hx80 based turbo. Last I was told, they were around 120psi and ~100-105k rpms. Calculated comp efficiency was ~55%, they use more water than fuel going down the track.
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dieselguy86
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Post by dieselguy86 on Dec 14, 2023 18:29:24 GMT -5
Hi Monty, John Just seems like it would be a tool to help better match the turb to the compressor, a large throat for wot, and slightly reduced throat for cruising or low power settings to help power the turb. But I might be thinking of when John had the really clipped turbine and had issues... It wouldn't have to be as extreme as one for a turbo. If you look at holsets design, I think it could be adopted and made pretty compact. The ngv backwall basically slides over the vanes. Instead of using an actuator and posts like holset does, a simple ball and ramp design could be used. If you've ever seen how brake disks work in older tractors, that's what I'm referring to. Here's a vid I found, it's backwards to what I proposed. Instead, leave the ngv fixed and move that ring.... youtu.be/WfL0jo8XIME?si=7hUCOYxZyYTctJLL
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dieselguy86
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Post by dieselguy86 on Dec 13, 2023 20:12:09 GMT -5
Hi John,
This is a bit out of left field, and way too late in your engine development to incorporate, but it seems like a good case for vnt.
Have you looked at how holset does theirs? Vanes are fixed, but a ring slides axially fwd/back to vary the amount of throat area. I think it would be a good system to implement, and it's a wayyy simpler system than garret's.
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dieselguy86
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Post by dieselguy86 on Jun 27, 2023 7:28:05 GMT -5
Hi John,
Between your 2 and 3 bar, could that be where the inlet air is "lining up" with the blade inlet angle?
If it was further downstream, it wouldn't be showing up in the surge slot. Only thing that makes sense in my mind, is the rpms, blade angle, and incidence are all agreeing with each other in that range.
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dieselguy86
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Post by dieselguy86 on Jun 8, 2023 21:41:24 GMT -5
Hi John,
Couldn't see what thrust was, but the first thing I noticed was how steady the p2 gauge was.
Wish I could be there to hear that thing run.
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dieselguy86
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Post by dieselguy86 on May 4, 2023 21:11:26 GMT -5
Hey John,
Didn't you buy a tiny turbo a few years ago?
Have a gt62,122mm comp and some bearings I could send to you to have some fun with.
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dieselguy86
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Post by dieselguy86 on Apr 19, 2023 21:44:13 GMT -5
Thought my day felt a lil short, thanks for speeding up the earth's spin.
Is there a faster way to get ahold of you, for when it's one of "those days"?
Loved it!
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dieselguy86
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Post by dieselguy86 on Apr 13, 2023 20:42:54 GMT -5
That's a low pressure turbo off a cat 15.2L acert engine. Comp inlet is 88mm,118ex. 112/102 turbine, Boreless shaft with titanium compressor wheel. Very heavy turbo with the iron compressor housing, 94lbs I think?
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dieselguy86
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Post by dieselguy86 on Feb 21, 2023 19:29:57 GMT -5
John,
Any link to that paper? Sounds interesting!
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dieselguy86
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Post by dieselguy86 on Feb 11, 2023 7:24:28 GMT -5
You will have to find a tool and die maker to make one that fits in your press.
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dieselguy86
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Post by dieselguy86 on Jan 22, 2023 0:21:44 GMT -5
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dieselguy86
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Post by dieselguy86 on Jan 6, 2023 21:04:31 GMT -5
KTS makes the wheel, id have to do some digging to find it again.
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dieselguy86
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Post by dieselguy86 on Jan 2, 2023 9:44:24 GMT -5
Look for a h1c/hx35 off a dodge ram pickup with the cummins or hx40 off an 8.3 cummins. There's alot of them out there usually only for a couple hundred bucks. You'll have to pay some attention, holset does there housings different, they list only the area of the housing so you'll see things 9cm, 12cm housing etc. Id get the 12cm, for $300 you can buy a brand new 14cm housing which would work better.
The only downside to these turbos is they use a divided housing, which is more flow restrictive than the same housing that is undivided.
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dieselguy86
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Post by dieselguy86 on Dec 21, 2022 8:47:30 GMT -5
Hi John,
Sounds as tho you've "unloaded" the rotor? Less lbs/sec of flow so the turbine isn't needing to make the extra power + extra fuel? If t2 is accurate then it was running at 76% efficiency at 3 bar. That's up ~10% from before right? It sounded to me like it was idling at higher rpms also.
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dieselguy86
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Post by dieselguy86 on Dec 21, 2022 0:18:52 GMT -5
Surge slot reading looked pretty rock solid to me. Your previous test I could watch the needle move, this one didnt seem to move much at all. P2 looked "bouncier"? T2, when comparing it to your Dec 16th test, looks like it dropped 80c?
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