Like the title says, my Jp Performance Double Chain set failed 2 days ago. I pulled the motor out and got the heads pulled yesterday. The chain broke right in half. I bent 3 valves and knicked 3 pistons From the looks of my front cover the chain was streched really bad because there are deep groves in the side of it. That's right I said the side of the cover not the front by the oil pump cover. When I installed this chain I put 2 front cover gaskets on for the oil pump cover clearance issue but I did not install a damper because I was told not to from different vender. This chain has around 15 to 20,000 miles on it. There have been many problems with the JP chains failing acording to a post on Club GP. I'll post some pics of the chsin and front cover a later after I fix my camera. If your running one of these chains it wouldn't be a ba idea to pull the front cover and check thing out. I'm personally going back to a new stock chain and damper for the rest of the year. I'll be doing a Gen V swap when the summer is done and probably a Triple Edge tranny. I'll just pull the cover when doing the swap and see how the stock shain and damper held up with my XP and 105 springs.
The only nice thing was that it broke about 50 yards from my driveway so I just pushed the car home. Also I was only going 25 mph so the RPM's were not high so the damage could have been a lot worse.
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1998 Grand Prix GTP~XP'ed~S2IC~XS Headers~78mm TB~P&P Gen V & Heads 1.89 intake~1.59 Exhaust~63 Injectors~PRJ Fuel Pump~SLP Loudmouth~SFI Overdrive Balancer~8 Rib Belt~PRJ Wires~1/4" Phenolic Spacer~
346.6 whp, 0 KR 27* Timing on E85~Built Trans~4340 Input~3:29's~ZZP 2750 TC~supporting mods
Talk to JP, see what they will do about it, they are insured for damage like that.
Had anything been done that might have comprimised the chain? Like spinning it to 15000 rpm or something?
No chance anything else didn't break to make it break?
Quote:
Originally Posted by joshgtp
Like the title says, my Jp Performance Double Chain set failed 2 days ago. I pulled the motor out and got the heads pulled yesterday. The chain broke right in half. I bent 3 valves and knicked 3 pistons From the looks of my front cover the chain was streched really bad because there are deep groves in the side of it. That's right I said the side of the cover not the front by the oil pump cover. When I installed this chain I put 2 front cover gaskets on for the oil pump cover clearance issue but I did not install a damper because I was told not to from different vender. This chain has around 15 to 20,000 miles on it. There have been many problems with the JP chains failing acording to a post on Club GP. I'll post some pics of the chsin and front cover a later after I fix my camera. If your running one of these chains it wouldn't be a ba idea to pull the front cover and check thing out. I'm personally going back to a new stock chain and damper for the rest of the year. I'll be doing a Gen V swap when the summer is done and probably a Triple Edge tranny. I'll just pull the cover when doing the swap and see how the stock shain and damper held up with my XP and 105 springs.
The only nice thing was that it broke about 50 yards from my driveway so I just pushed the car home. Also I was only going 25 mph so the RPM's were not high so the damage could have been a lot worse.
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1980 Turbo Trans AM, Pontiac 400 / THM350
1994 Cadillac Fleetwood Brougham with RPO V4P, aka, 7000 lb tow package, PCM tuned by me with TunerCat and Moates APU1
1999 Chevrolet Suburban K2500 454, 4L80E PCM tuned by me with TunerCat2
2000 Buick Park Ave Ultra, Supercharged 3800 L67, PCM tuned by me with TunerCat2 and Moates Roadrunner PCM for realtime tuning
No reving to 15000 rmp's lol, my shift points are set around 6200 rpm. At the time of failer I was very low rpm's. I was going 20-25 mph and hamered down and she just shut off. There have been a number of the JP chains fail from what I've heard on Club GP. There is a write up on this Topic on Club GP in the L67/L32 section. Zoom from ZZP has been in contact with JP Performance about this issue but they are saying it's install error which is Bull ****!! I'm positive it was the chain that failed. Before I pulled the front cover off I took both valve covers off and turned the crank. As soon as I turned it I new it was F*!*!!. It turned way to easy and nothing on the heads moved at all. It could have been worse but I'm still pissed about the whole ordeal. I should have just bougth a new stock chain & damper the 1st time. Live and learn.
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1998 Grand Prix GTP~XP'ed~S2IC~XS Headers~78mm TB~P&P Gen V & Heads 1.89 intake~1.59 Exhaust~63 Injectors~PRJ Fuel Pump~SLP Loudmouth~SFI Overdrive Balancer~8 Rib Belt~PRJ Wires~1/4" Phenolic Spacer~
346.6 whp, 0 KR 27* Timing on E85~Built Trans~4340 Input~3:29's~ZZP 2750 TC~supporting mods
Like the title says, my Jp Performance Double Chain set failed 2 days ago. I pulled the motor out and got the heads pulled yesterday. The chain broke right in half. I bent 3 valves and knicked 3 pistons From the looks of my front cover the chain was streched really bad because there are deep groves in the side of it. That's right I said the side of the cover not the front by the oil pump cover. When I installed this chain I put 2 front cover gaskets on for the oil pump cover clearance issue but I did not install a damper because I was told not to from different vender. This chain has around 15 to 20,000 miles on it. There have been many problems with the JP chains failing acording to a post on Club GP. I'll post some pics of the chsin and front cover a later after I fix my camera. If your running one of these chains it wouldn't be a ba idea to pull the front cover and check thing out. I'm personally going back to a new stock chain and damper for the rest of the year. I'll be doing a Gen V swap when the summer is done and probably a Triple Edge tranny. I'll just pull the cover when doing the swap and see how the stock shain and damper held up with my XP and 105 springs.
The only nice thing was that it broke about 50 yards from my driveway so I just pushed the car home. Also I was only going 25 mph so the RPM's were not high so the damage could have been a lot worse.
I wouldnt be a happy camper. Sorry dude! But look on the brighter side, at least you still have your bottom end intacted.
From the looks of my front cover the chain was streched really bad because there are deep groves in the side of it. That's right I said the side of the cover not the front by the oil pump cover. When I installed this chain I put 2 front cover gaskets on for the oil pump cover clearance issue but I did not install a damper because I was told not to from different vender. This chain has around 15 to 20,000 miles on it. There have been many problems with the JP chains failing acording to a post on Club GP. I'll post some pics of the chsin and front cover a later after I fix my camera. If your running one of these chains it wouldn't be a ba idea to pull the front cover and check thing out. I'm personally going back to a new stock chain and damper for the rest of the year. I'll be doing a Gen V swap when the summer is done and probably a Triple Edge tranny. I'll just pull the cover when doing the swap and see how the stock shain and damper held up with my XP and 105 springs.
But look on the brighter side, at least you still have your bottom end intacted.
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