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Post by Johansson on Oct 18, 2011 16:03:46 GMT -5
Today I used my newly bought set of countersinking tools on the NGV housing, earlier I had countersunk the M10 insex bolts with a large drill but now the matching surfaces for the bolt heads are flat like they should be. Looks much better now. After that I took the engine completely apart to clean it out and inspect the bearings to see if there has been any wear during the run, fortunately I cannot find any signs of wear other than what occured during the starter motor tests where I spooled it up without oil pressure during some of the tests. Cheers!
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Post by racket on Oct 18, 2011 16:47:40 GMT -5
Hi Anders
Heh heh , I recon we've all spun our engines without pressurised oil at some time .
I noticed that there was minor scuffing of a couple of the thrust bearing lands when I had a look inside the 10/98 bearings after its test runs , I found that some of the lands had been marginally higher than other when I measured the insitu thrust lands prior to initial assembly of the engine , I used a good quality depth micrometer at the time, seating on the machined diffuser to bearing housing surface which was machined at the same time as the thrust bearing mounting surface , the only reason for the inconsistencies was bearing land thickness , the thrust bearing appears to be a "forged" item so theres always the possibility of minor thickness differences .
Engines lookin' good , so whens the next test run ;-)
Cheers John
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Post by Johansson on Oct 19, 2011 15:08:25 GMT -5
No date set yet, I still have the coating to do along with some other things so it might be a month or so away. We will start working on the jetkick any day now so I will have a bit less time to work on the JU-01 from now on. I just got the 2x15L scuba tank I bought from a diver a week ago, they will give me 3-4 starts before reloading compared to just barely one start that I got out of the borrowed 7L bottle I used during the last run.
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Post by racket on Oct 19, 2011 16:05:27 GMT -5
Hi Anders
Can't have too much starter air :-)
Sounds like you guys are gearing up for Speedweek .
Cheers John
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Post by turbochris on Oct 19, 2011 19:31:18 GMT -5
I can tell by the f'd up noises that I forgot to turn the oil pump on. What good is a gauge if I don't look at it?
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Post by Johansson on Oct 20, 2011 0:08:31 GMT -5
Yup, the ice has just started to lay on the local lake so in a month it should be possible to make a test run with the kick. The other years we haven´t had time to do any actual driving before the race and that has caused some problems, last years handling problems would have showed directly if we had driven it before the race. I can tell by the f'd up noises that I forgot to turn the oil pump on. What good is a gauge if I don't look at it? I hear you brother, the only gauge I seem to be capable of monitoring during a run is the P2 gauge. Before the next run I will install an oil pressure switch coupled to the fuel pump so I cannot start the engine without oil pressure.
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Post by Johansson on Oct 24, 2011 15:31:29 GMT -5
Today I´ve been busy fitting an oil pressure switch to the filter holder and coating some more engine parts. The finished filter holder. The engine parts waiting for a layer of coating. And here are the same parts a bit darker in colour. I bought a cheap oven for hardening coating and annealing cast aluminum a couple of days ago, here it is with the NGV housing inside. After some tuning I managed to get this crappy oven up to 350°C, not bad at all! And here is the NGV with coating on it again, it takes an hour to heat treat each part so I will have to do the rest of the parts some other day. Cheers!
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Post by racket on Oct 24, 2011 17:14:02 GMT -5
Hi Anders
The build Thread has been a bit quiet lately , I've been wondering what you've been up to , parts are looking good , ................ 350 C , now thats getting her smokin' :-)
I'm just waiting for the camera battery to get fully charged before firing up the kart to test the A/B , she's all tanked up and tethered to her mounts .
Cheers John
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Post by Johansson on Oct 25, 2011 0:22:53 GMT -5
Hi Anders The build Thread has been a bit quiet lately , I've been wondering what you've been up to , parts are looking good , ................ 350 C , now thats getting her smokin' :-) I'm just waiting for the camera battery to get fully charged before firing up the kart to test the A/B , she's all tanked up and tethered to her mounts . Cheers John The fridge and cooler needed replacement so I have been busy rebuilding the kitchen cabinets this weekend, but now when that is done I expect to get some work done in the workshop. I see that you ran her again John, for some reason I cannot watch youtube here at work so I will check it when I get home. Cheers!
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Post by turbochris on Oct 25, 2011 7:19:47 GMT -5
fridge and cooler- needed for beer. Good thing to fix them.
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Post by Johansson on Oct 25, 2011 15:08:14 GMT -5
Exactly my thought, now if only I could find room for the old cooler in the workshop.... I heat treated the turbine housing and the oil lines an hour ago, I should also heat treat the coated shaft tunnel and diffusor plate but I don´t dare since I don´t know what 350°C for an hour will do to the bearing seats. Don´t want to mess upp the bearing play now when it seems to work fine. Cheers! /Anders
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Post by Johansson on Oct 27, 2011 16:59:57 GMT -5
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Post by racket on Oct 27, 2011 22:25:32 GMT -5
Hi Anders
Have you noticed how easy they seem to go back together after a few tear downs , you begin to know each part and nut and bolt intimately , much simpler than an IC engine of similar power
Cheers John
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Post by Johansson on Oct 28, 2011 9:13:35 GMT -5
Sure have, it is incredible that these engines with their wobbly tolerances and crude brass bearings can outpower a hightech piston engine with its extreme tolerances and countless parts.
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Post by Johansson on Nov 1, 2011 17:27:38 GMT -5
Howdy folks! Today I continued assembling the engine and lockwired all bolts inside it to make sure nothing comes lose. The oil return plenum lockwired and the air deflectors in place. NGV and turbine shaft in place! One single insex bolt would make havoc with the turbine wheel so I decided to lockwire these as well, it takes a while to do but it will sure make me sleep better at night. Here is the reassembled engine, I am keeping my fingers crossed that I won´t have to go through all this again after the next run. Cheers!
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