Compressor Clearance question
T04B H trim compressor wheel in a .60 trim cover. I'm referring to the gap between where the compressor fins curve to the exducer and the compressor cover. The clearance is around 1-2mm. Is this acceptable?
http://i20.photobucket.com/albums/b2...e/IMG_0467.jpg http://i20.photobucket.com/albums/b2...e/IMG_0474.jpg |
Ive heard figures greater than .5m will lose noticeable efficiency? and noticed more on diesel engine apparently?
Theres great efficiency gains to be made apparently with tighter tolerances between wheel and cover. so generally tighter bearing tolerances are needed to reduce that gap. At the end even with that gap it will probably blow enough air to make boost and decent power. give it a whirl |
ive never tried using teh wrong wheel in a bigger comp cover, but im sure flow will hurt. why not just find the cover or wheel that fits?
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Originally Posted by gxl90rx7
(Post 11260211)
ive never tried using teh wrong wheel in a bigger comp cover, but im sure flow will hurt. why not just find the cover or wheel that fits?
.6a/r cover is to4b cover. So is H trim wheel.. It looks like its just been badly profiled... Unless he means he’s replaced the super trim T04B 60-1 wheel with an H trim????? that would be a no no for sure.... |
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The 60 trim cover is a 2.950 major/ exd. I think you have an H wheel thats 2.75 major/exd. Thats why the exducer is so loose, pretty big gap there. From the photos and the info thats what I come up with... I wouldn't think it would work well.
pic below is of a proper h trim See your in NWFL. Do you ever make it to Fort Walton Beach?? |
We machined the compressor cover on my hybrid to have 0.5mm clearance between inducer and housing. This mirrored the clearance it had with the original smaller wheel (U-trim) before machining & with what I was able to find through searching around. Supposedly 0.5-0.6mm clearance is the norm.
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Originally Posted by RotaryRocket88
(Post 11261615)
We machined the compressor cover on my hybrid to have 0.5mm clearance between inducer and housing. This mirrored the clearance it had with the original smaller wheel (U-trim) before machining & with what I was able to find through searching around. Supposedly 0.5-0.6mm clearance is the norm.
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Why not stop all the guessing and just pull the cover off and measure the actual clearence? Can't believe that wasn't the first suggestion.
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Originally Posted by Knockers
(Post 11261767)
If you look at the pics there is alot more than .5mm of clearence as you move from the inducer to exducer
Originally Posted by K-tune
T04B H trim compressor wheel in a .60 trim cover.
409826-0015, 70x58.40 mm, 70 trim, H trim Turbonetics 60-1, 76.2x59.0 mm https://www.rx7club.com/2nd-generati.../#post10674115 A 60-1 compressor wheel has a slightly wider inducer (0.6mm) and the exducer is a lot wider (6mm), which would require a wider opening to follow the curve. |
When I ordered the comp cover I simply asked for a T04B cover suitable for an H-Trim wheel. I sent it back and will hopefully get the right cover this week.
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