This can't be good
10-07-2010, 03:06 AM
#32
Super Duper Moderator
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
Hey guys,
Did some cold leak down numbers and cylinder six was audibly leaking air.
I've decided to get a rebuild done so I'll keep you up to date as to the issues.
I am hoping for a valve spring too but some piston damage would justify a bore-out to 3.8......
Marc
Did some cold leak down numbers and cylinder six was audibly leaking air.
I've decided to get a rebuild done so I'll keep you up to date as to the issues.
I am hoping for a valve spring too but some piston damage would justify a bore-out to 3.8......
Marc
10-07-2010, 03:51 AM
#33
Drifting
I bought the stock parts after some "listening around". If you're not thinking of increasing the revs compared to stock they are enough, and the quality is improved compared with 20 years ago.
Thomas
Thomas
10-07-2010, 10:20 AM
#34
Rennlist Member
Marc,
After further reflection I have come to the obvious conclusion that that peice of metal is the result of the inherent design defect of the 3.6 P&Cs and is actually a balled up peice of the cylinder wall that just happens to look like a valve spring. Good you caught it in time, the only real fix as suggested is to ditch the failure prone 3.6 bits for the 3.8 replacements (why use defective replacements?) new valve job, perhaps replace the cams that may have been damaged in the process, swap the DME out for MOTEC, LWF and cup clutch... And then there's the stuff you should do "while you're in there" as part of the reseal.
Sorry to give you the bad news but it HAS to be done, otherwise that thing could explode at any moment... Just sayin...
After further reflection I have come to the obvious conclusion that that peice of metal is the result of the inherent design defect of the 3.6 P&Cs and is actually a balled up peice of the cylinder wall that just happens to look like a valve spring. Good you caught it in time, the only real fix as suggested is to ditch the failure prone 3.6 bits for the 3.8 replacements (why use defective replacements?) new valve job, perhaps replace the cams that may have been damaged in the process, swap the DME out for MOTEC, LWF and cup clutch... And then there's the stuff you should do "while you're in there" as part of the reseal.
Sorry to give you the bad news but it HAS to be done, otherwise that thing could explode at any moment... Just sayin...
10-07-2010, 11:11 AM
#35
Super Duper Moderator
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
Marc,
After further reflection I have come to the obvious conclusion that that peice of metal is the result of the inherent design defect of the 3.6 P&Cs and is actually a balled up peice of the cylinder wall that just happens to look like a valve spring. Good you caught it in time, the only real fix as suggested is to ditch the failure prone 3.6 bits for the 3.8 replacements (why use defective replacements?) new valve job, perhaps replace the cams that may have been damaged in the process, swap the DME out for MOTEC, LWF and cup clutch... And then there's the stuff you should do "while you're in there" as part of the reseal.
Sorry to give you the bad news but it HAS to be done, otherwise that thing could explode at any moment... Just sayin...
After further reflection I have come to the obvious conclusion that that peice of metal is the result of the inherent design defect of the 3.6 P&Cs and is actually a balled up peice of the cylinder wall that just happens to look like a valve spring. Good you caught it in time, the only real fix as suggested is to ditch the failure prone 3.6 bits for the 3.8 replacements (why use defective replacements?) new valve job, perhaps replace the cams that may have been damaged in the process, swap the DME out for MOTEC, LWF and cup clutch... And then there's the stuff you should do "while you're in there" as part of the reseal.
Sorry to give you the bad news but it HAS to be done, otherwise that thing could explode at any moment... Just sayin...
I had to print that out to show my wife to justify the expense - "It's all about safety, honey - you want me to be safe, don't you?"
Marc
10-07-2010, 11:54 AM
#37
Burning Brakes
Good luck with the rebuild, hopefully your ready to roll in the spring, I believe Spring Mountain in Feb might be the first event Paul does.
Russ
10-07-2010, 12:32 PM
#38
Rennlist Member
10-07-2010, 03:36 PM
#40
Rennlist Member
11-12-2010, 08:11 PM
#42
Super Duper Moderator
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter
Okay, so the metal fragment was a valve spring.
I have had the local wrench dive into a rebuild as I don't have the time to do it myself.
We are re-using the same heads (later style with gasket groove already cut), resurfacing the valves, putting in ARP head studs, Jerry Woods springs, and Pauter rods. The pistons/cylinders are fine and we'll use new valve guides, bearings, etc.
I was tempted by the 9M heads but, after a few talks with Geoffrey and e-mail messages with Colin, I have taken their advice and opted to install Motec first for better gains and may opt for 9M heads down the road (too pricey to do both right now). At that time I will also put in 9M rockers and springs.
Anyway, most parts are on order, the heads are at the machine shop, and I remain car-less.
Marc
I have had the local wrench dive into a rebuild as I don't have the time to do it myself.
We are re-using the same heads (later style with gasket groove already cut), resurfacing the valves, putting in ARP head studs, Jerry Woods springs, and Pauter rods. The pistons/cylinders are fine and we'll use new valve guides, bearings, etc.
I was tempted by the 9M heads but, after a few talks with Geoffrey and e-mail messages with Colin, I have taken their advice and opted to install Motec first for better gains and may opt for 9M heads down the road (too pricey to do both right now). At that time I will also put in 9M rockers and springs.
Anyway, most parts are on order, the heads are at the machine shop, and I remain car-less.
Marc
11-12-2010, 08:26 PM
#43
Nordschleife Master
11-12-2010, 08:33 PM
#44
Super Duper Moderator
Lifetime Rennlist
Member
Lifetime Rennlist
Member
Thread Starter