bad news boys.. motor is coming out again
#47
09-13-2009, 08:07 AM
Join Date: Jun 2007
Location: USA
Age: 54
Posts: 935
Rep Power: 90 
good info jay thank you!!
tim
tim
I think you have to take a good look at the factory system first before you make changes with hardware. The factory stud may yield/stretch more during assembly than the ARP one. If this is the case it doesn't relax as much after a heat cycle and has a better chance at holding the head down. You can't really say "ARP sucks" without really understanding whats going wrong. The next problem is ARP gives a torque value that the fastener starts to yield at and thats that... going in a small block chevy or a 997 a 7/16 or 11mm fastener gets a similar value. The block/cylinder/head is a whole lot more dynamic on the 997 so you can see where that may start to offer issues. If it was as simple( and maybe it is...) as going to a 12mm fastener life would be great.. But that 12mm fastener is going to take more torque to yield than the 11mm and that could cause more stress/distortion of the assembly, remember it's a system. Or the 12mm relaxes back to some yield that will hold the heads down without re torque? Were the studs installed to ARP's spec? or was someone "giving it a little extra"?
One thing I have done on engines that are a pain in the *** to retorque is heat cycle them on the engine stand. This can be done with a water heater and water pump. All fasteners/engines change after a heat cycle. For those of you that have gone rounds with copper gaskets it's all to present of an issue. I believe "they" said 30% of the stretch was lost in the first heat cycle.
Sorry to hear of your problems.
One thing I have done on engines that are a pain in the *** to retorque is heat cycle them on the engine stand. This can be done with a water heater and water pump. All fasteners/engines change after a heat cycle. For those of you that have gone rounds with copper gaskets it's all to present of an issue. I believe "they" said 30% of the stretch was lost in the first heat cycle.
Sorry to hear of your problems.
#48
10-06-2009, 11:45 AM
Join Date: Jun 2007
Location: USA
Age: 54
Posts: 935
Rep Power: 90
update
well motor is going back together here is a couple of things notices along the way
leakdown test passed with flying colors
pistons had no signs of detonation thanks to the great protomotive tuning
the ARP studs were not at there original torque rate that we installed them at
..... i did a ton of research and its just plain and simple engineering/and proper torque insturuction that matters and raceware fasteners provided both.... i attached the instructions that came with the raceware fasteners i do not have the instructions for the arp it was 2.5 years ago
and yes i will be putting the engine through a full heat cycle and removing the motor and re-torqueing ..yuck but necessary
i know there are a few people with the same issue with the ARP headstud kit please pm me if we can get a enough guys together we can push for some sort of compensation
leakdown test passed with flying colors
pistons had no signs of detonation thanks to the great protomotive tuning
the ARP studs were not at there original torque rate that we installed them at
..... i did a ton of research and its just plain and simple engineering/and proper torque insturuction that matters and raceware fasteners provided both.... i attached the instructions that came with the raceware fasteners i do not have the instructions for the arp it was 2.5 years agoand yes i will be putting the engine through a full heat cycle and removing the motor and re-torqueing ..yuck but necessary
i know there are a few people with the same issue with the ARP headstud kit please pm me if we can get a enough guys together we can push for some sort of compensation
#54
10-21-2009, 11:43 PM
Registered User
Join Date: Feb 2004
Location: In a Canyon - Really :)
Posts: 4,880
Rep Power: 288
So sorry to hear this stuff. Hope it work sout in the end and you'll back at teh adventure with fond memories.
#56
10-22-2009, 09:21 AM
Join Date: Jun 2007
Location: USA
Age: 54
Posts: 935
Rep Power: 90
hey guys so idrove the car for the first time last night... the raceweare headstuds are holding perfectly its amazing how much faster the car is when the heads are bolted down correctly
!! feels real good! added a rs flywheel and CM fibertuff disc... and a snow meth kit
thanks art took her out for the first time last night boy what a difference when the heads stay down!! the heat cycling is key although a huge pain!!
hey man.. made a great memory last night 1.41 bar second gear punched it the car hooked and started to torque steer LOl i had a smile on my face for an hour just typing this makes me smile...
it has to do with he(case jug head) and the proper torque procedures included from the manufacture of the fastener
!! feels real good! added a rs flywheel and CM fibertuff disc... and a snow meth kitthanks art took her out for the first time last night boy what a difference when the heads stay down!! the heat cycling is key although a huge pain!!
just typing this makes me smile...it has to do with he(case jug head) and the proper torque procedures included from the manufacture of the fastener
#60
10-22-2009, 01:23 PM
Registered User
