Originally Posted by Red__Zed You build alot of subaru motors? The factory STI's have alot of problems with piston ring lands and the reason has to do with poor bottom
|
|
LinkBack | Thread Tools | Display Modes |
12-23-2012, 11:11 AM | #31 (permalink) |
Base Member
Join Date: Sep 2012
Location: Lebanon
Posts: 159
Drives: Volvo T5-R
Rep Power: 12 |
You build alot of subaru motors?
The factory STI's have alot of problems with piston ring lands and the reason has to do with poor bottom end design. So to make power you have to go away from cast pistons even on the WRX like your own that don't have the same amount of ring land problems meaning that your expansion rates are alot higher in the piston and piston skirt length becomes increasingly important. The problem is that there isn't any room to expand the length of the skirt so with forged pistons you get alot of slap on start up until they expand to fit the bore. Ever driven an STI or WRX with forged internals? They all piston slap because of expansion rates until they come up to temp unless you spring for Cosworth pistons due to metal type. You get Weisco/CP your going to have alot of slap on start up. This slap = mechanical cylinder wall wear you will be lucky to see 50,000mi on a Weisco/Cp setup and 100,000 on a Cosworth setup. |
Bookmarks |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Interesting article | bigdog1250 | Nissan 370Z General Discussions | 10 | 01-28-2011 04:31 PM |
Interesting article in Import Tuner- short ram | SE | Intake/Exhaust | 15 | 05-10-2010 12:20 AM |
Interesting Z article | Jessica | The Lounge (Off Topic) | 2 | 03-22-2010 09:58 PM |
Interesting Article on AOL Autos... | Jeffblue | Nissan 370Z General Discussions | 22 | 03-18-2010 07:38 AM |
370Z in Car & Driver Comparo | joentown | Nissan 370Z General Discussions | 8 | 03-30-2009 07:01 PM |