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  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
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Broken Rocker studs

  • Thread starter Thread starter mikenstang
  • Start date Start date Aug 24, 2006

mikenstang

New Member
May 12, 2003
55
0
0
CT
Aug 24, 2006
#1
  • Aug 24, 2006
  • #1
Hey all It's been a while since I've been on this forum I have been over at the Tweecer Site for a while. Anyway, I have broken my 3rd rocker stud on my TF trackheat heads. It happens on both exh and intake valves and is very random.

The first one was over a year ago and I was on the throttle (5-6K RPM) when it broke so I chalked it up to that. The second one was about 2 months ago while I was tuning it with Tweecer and it was running like Shibitz!! (pinging, rich etc...), I was running it normal driving when it broke. So I chalked it up maybe the eng caughed or backfired and slapped the valve???

This time the car is running great (like OEM) for a while now, I was just driving very light and another one broke??? I have 7/16th studs, TF 1.7:1 RR with a TF stage 1 cam and TF pushrods # 6.750 080 with stock pistons.

Any Ideas??? Can pinging cause this to happen?? I do have some ping which I am trying to tune out with the Tweecer. Maybe I am adjusting them wrong?? I use the method on the Crane cams website??
 
R

R2D2

Aug 24, 2006
#2
  • Aug 24, 2006
  • #2
what springs? How much before coil bind? Seat and open pressure?
 

mikenstang

New Member
May 12, 2003
55
0
0
CT
Aug 24, 2006
#3
  • Aug 24, 2006
  • #3
They are stock springs that came with the TF heads. This is from the TF web site
.460" o.d. double spring with damper
125 lbs. @ 1.780" installed height
376 lbs. @ 1.180" open
420 lbs. per inch rate
.600" maximum valve lift
 
R

R2D2

Aug 24, 2006
#4
  • Aug 24, 2006
  • #4
thats a pretty weak spring for a hydraulic roller cam and the ramp rates they have. They may be having some problems controlling the open and close actions . Have you ever checked the valve train geometry also
 

mikenstang

New Member
May 12, 2003
55
0
0
CT
Aug 24, 2006
#5
  • Aug 24, 2006
  • #5
The strange thing is that after I change out the stud, The car runs great. No bent push rods, valves, Compression is 150 - 160? I don't get it??????
 
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