Broken shims ?!?!
#1
Scooby Newbie
Thread Starter
Join Date: Aug 2013
Location: Bulgaria
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
Broken shims ?!?!
I was driving my 98 impreza turbo on 2nd gear till redline i changed to 3rd and at that moment the car started running on 3cyl. I stopped it and removed the left cam cover. Two of the shims were broken and the two valves were stuck open(exhaust if it matters). I changed the 2 valves, shims, buckets and drove my car carefully for a week. Yesterday the exact same thing happened to the same head(exhaust valve), but the other 2 shims were broken.
What can I do to stop braking these things. The rev limiter is 7000rpm not that high.
Here is a pic
http://prikachi.com/images/826/6596826U.jpg
What can I do to stop braking these things. The rev limiter is 7000rpm not that high.
Here is a pic
http://prikachi.com/images/826/6596826U.jpg
#2
Scooby Regular
iTrader: (1)
What did you set the valve clearances to when you changed the valves,buckets and shims ??
The outer bucket shim can be flicked out and broken by the cam lobe in certain circumstances eg valve float,excessive valve clearance, running anti-lag etc etc.
You can change to STi Version 3~4 under bucket shims and valvetrain or even the selective buckets (no shim) or stop bouncing it off the rev limiter.
Mick
The outer bucket shim can be flicked out and broken by the cam lobe in certain circumstances eg valve float,excessive valve clearance, running anti-lag etc etc.
You can change to STi Version 3~4 under bucket shims and valvetrain or even the selective buckets (no shim) or stop bouncing it off the rev limiter.
Mick
#6
Scooby Newbie
Thread Starter
Join Date: Aug 2013
Location: Bulgaria
Posts: 12
Likes: 0
Received 0 Likes
on
0 Posts
I'm running megasquirt with td05 20g turbo on 1.3bar on methanol/gasoline 50:50. Yes I have launch control and antilag(not that hard). I can't understand why the launch control, rev limiter, antilag are causing this?
It didn't broke the same shims the second time. It broke 2 other which were a little bit bigger than the others. In fact they were pretty tight round 0.1mm.
Is it possible to weld the shims to the buckets?
It didn't broke the same shims the second time. It broke 2 other which were a little bit bigger than the others. In fact they were pretty tight round 0.1mm.
Is it possible to weld the shims to the buckets?
Thread
Thread Starter
Forum
Replies
Last Post
shorty87
Full Cars Breaking For Spares
19
22 December 2015 11:59 AM
M4RKG
General Technical
3
30 September 2015 07:51 PM
shorty87
Wheels And Tyres For Sale
0
29 September 2015 02:18 PM