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Freshly Rebuilt Evo 8 turbo! ported!
Jul 14, 2013, 12:28 AM
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Freshly Rebuilt Evo 8 turbo! ported!
as the title says... i got this turbo for free... it seemed like a shame to toss it so i had it rebuilt... and i got an awesome deal on porting so i said **** it... the shaft play is well with in OEM spec at .020". but this was measured dry... the trust play is also with in oem spec as well... 100
link to shaft play video
http://s486.photobucket.com/user/joe...1e902.mp4.html
http://store.forcedperformance.net/m...creen=Info_FAQ
Q. The shaft in my turbo feels loose. How much freeplay should I have?
A. While this specification does vary from one brand to another and rule of thumb is less than .030" radial freeplay and less that .002" axial freeplay.
This amount of freeplay is required to allow the bearings to "float" in a pressurized film of oil while the engine is running. The flow of oil through the clearance around the bearings is what helps the bearings stay cool. This oil film around the bearings also help dampen vibrations that occur to the rotating assembly as it moves through it range of RPM. Ball bearing turbochargers do not have this pressurized film of oil around the bearings; this is why they are somewhat more noisy than floating journal bearing turbos.
link to shaft play video
http://s486.photobucket.com/user/joe...1e902.mp4.html
http://store.forcedperformance.net/m...creen=Info_FAQ
Q. The shaft in my turbo feels loose. How much freeplay should I have?
A. While this specification does vary from one brand to another and rule of thumb is less than .030" radial freeplay and less that .002" axial freeplay.
This amount of freeplay is required to allow the bearings to "float" in a pressurized film of oil while the engine is running. The flow of oil through the clearance around the bearings is what helps the bearings stay cool. This oil film around the bearings also help dampen vibrations that occur to the rotating assembly as it moves through it range of RPM. Ball bearing turbochargers do not have this pressurized film of oil around the bearings; this is why they are somewhat more noisy than floating journal bearing turbos.
Last edited by joseph143; Sep 20, 2013 at 06:35 AM.
