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Post by enginewhisperer on May 13, 2024 23:20:57 GMT -5
Aeroflow is in Sydney I can probably get some of those bits at trade price if you need them. I think the aluminium ones are 1.6 or 2mm thick. I have a 4" one at home I can check.
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Post by racket on May 14, 2024 0:41:41 GMT -5
Hi Andrew
Thats handy , I wonder why I didn't buy off them ??
LOL.............maybe because my first comps were bigger than 5"at 128mm , I really can't remember ..............just had a look and it was during Covid Lockdowns , there was nuthin' nowhere , the local Op Shop was only 100 meters away so used what I could find :-)
Cheers John
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Post by enginewhisperer on May 14, 2024 0:46:00 GMT -5
I think some of those are new products. I don't remember there being 5" or 6" ones before. I hadn't seen the carbon fibre one before. Nearly had to order one of those except it'll be hard to weld to my aluminium intake pipe
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Post by racket on May 14, 2024 2:54:52 GMT -5
Thats possible , I used one on the 12/118 engine postlmg.cc/qgLTzvKz Found this comment on my thread ... ...... I needed something fairly strong for mounting the starter off , it was advertised as 1/8" thick alloy , but only ended up ~2mm , also the throat is ~5mm bigger than my inducer which necessitated a bit of a taper in the comp housing snout bore to blend things , but it'll do the job :-)....... Sounds like it was a "5 incher " but with the bore only 5mm bigger than my 118mm comp , thats 123mm or 4.85" , so 5" OD so that its the same as the 5" turbo casting and easy to fit with a flexible coupling , maybe I remembered that when I did the current bellmouth .
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Post by enginewhisperer on May 14, 2024 3:19:45 GMT -5
that would make sense. I thought I remembered something that looked like that from years ago!
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richardm
Senior Member
Joined: June 2022
Posts: 338
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Post by richardm on May 14, 2024 3:44:00 GMT -5
You can get those much cheaper but they not polished ( who care) www.ebay.ca/itm/293555299987I bought mine about 3-4 years ago Not exactly a new product. They re thin but quite stiff from being spun Your starter mount could probably be reused as is I would just reinforce the mounting points by adding a shaped piece of aluminum on the outside of the bell A one inch square 1/16 thick piece shaped to conform as much as possible to the bell mouth where the starter mount bolts will go and glued withs JB weld or similar and drilled The idea is to spread out the bolt tension Im not worried about such a bell mouth handling the torque of the starter Another idea would be to use fiberglass on the outside to reinforce it
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Post by racket on May 14, 2024 4:24:41 GMT -5
Hi Richard
Yep , thats a better priced bellmouth , but its 5" OD again :-(
I considered filling inside the return section of the bellmouth with some JB weld at the starter spider mounting points, but never got around to it ............LOL, other things were more important .
The engine is still siting on my shed floor doing nothing but gathering dust , maybe one day I'll get back to it and reinforce the mountings :-)
Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 338
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Post by richardm on May 14, 2024 6:51:38 GMT -5
what exact size do you need ?
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Post by racket on May 14, 2024 16:49:27 GMT -5
Hi Richard
The bore/throat of the bellmouth needs to be at least 5 inch- 127 mm preferably a millimeter or two larger , the 5 inch bellmouths have 5 inch OD but a few millimeters undersized for the bore which isn't a good thing when feeding a 127 mm inducer .
The bellmouth outlet could be cut back to a point where the bore is big enough but that creates other mounting issues with being able to get to the fasteners .
LOL.............I'll stick with what I have, its too big a job to change things .
Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 338
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Post by richardm on May 14, 2024 17:05:11 GMT -5
For sure its a big job..
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Post by racket on May 19, 2024 23:46:06 GMT -5
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Post by racket on May 23, 2024 19:55:47 GMT -5
Hi Guys
Bit of an update .
I've done some flow checks as well as changed the A/B fuel pump .
Initial test of the 2 X 044 pumps, running on 12V, pumping through the A/B fuel ring produced a flow of 6 lpm at a delivery pressure of 17 psi, considerably higher pressure than during the test run on Monday ..
I then did a flow check of the single 044 pump that supplies the engine which runs on 24 V and it flowed 8 lpm at some 80 psi delivery pressure , flow being taken off at the outlet of the high pressure fuel filter prior to fuel entering the engine.
As the afterburner pump/s are only activated when the engine is running , a decision was made to run the a single 044 pump off the 24V starter pack, test found that 8 lpm was sprayed from the fuel ring at a delivery pressure of 23 psi , some 35% greater pressure than the 2X 044 pumps on 12V.
The relatively greater flow is probably because of the better flow delivery into and out of the single pump compared to the restrictive dual pump setup .
Engine is partly disassembled at present and will be fully pulled apart to check everything after its latest higher P2 runs , there might be a need for some "adjustment" to the NGV throat area .
The IGV stator will be removed as its requiring too high a RPM to reach my 5.5:1 PR - 66 psi P2 , comp tip speed 1950 ft/sec , turb tip speed 1660 ft/sec at temps that aren't "friendly" :-(
The IGV stator, set at 25 degrees , certainly helped at lower PRs , but who wants to run there , I'll put up with the mild surge at idle .
Cheers John
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Post by racket on May 24, 2024 3:51:59 GMT -5
Hi Guys I think I might have finally got a flametube that isn't trying to destroy itself . Pulled the engine apart and the flametube looks the same as when I put it together and after a few hard test runs . The spray of exhaust pipe paint is like new Cheers John
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richardm
Senior Member
Joined: June 2022
Posts: 338
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Post by richardm on May 24, 2024 4:25:56 GMT -5
Nicely designed then!
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Post by racket on May 24, 2024 4:41:43 GMT -5
Hi Richard
LOL.............more good luck than "design" :-)
The poor old flametube has seen some rough times , bits melted , blowouts , and hot spots , so nice to pull it apart and find it in one piece .
Hopefully the rest of the engine is just as good , the comp was still in alignment with the shaft quill, so no spinning encounted , turb wheel OK and no rubs .
Tomorrow I'll check the bearings to make sure the thrust unit is coping with the extreme loads from both RPM and air loads, its only meant to run at 40psi P2 not 66 psi, the envelope is being stretched a tad ;-)
Cheers John
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