IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: TurboCajun on June 22 2014, 11:02:39 AM
-
Went to the track last night to watch some races, once I left the track I get on the highway and taking off normal , went thru first gear into second so I give it a lil gas to get to 55 mph because traffic was coming , made about 2 psi of boost then I hear a loud release of pressure and the car kills. Pulled over and the car doesn't start and spins over very easily like there is no compression. Had one of my friends check the rocker and they are not moving. Timing chain must have broke.
-
If you havent replaced the nylon coated sprocket, it probably deposited its nylon into the oil pan.
-
Ewwww... hopefully the pistons didn't smack the valves.
-
double rooler snapped
-
Wow, that's a bad day. I wonder if, seeing as how the chain is still threaded over the cam sproket, that the cam gear stopped rotating almost the instant that the chain snapped, leaving it in it's current location? I would think if it rotated much more the chain would have been pulled down off the sprocket. Maybe that would be an indication of contact causing rapid deceleration real close to the instant the chain snapped.
Whatever it was, sorry about your luck. Hopefully that was the only damage and you'll be back on the road soon :cheers:
-
That chain had to be defective from the factory. What brand is it?
Steve
-
Steve...if it wasn't defective...wh at's your guess as to what would cause this?
-
Picture looks like the rod cap broke. It had a stroker kit in it. Webber built the engine. Has not been run very hard for what it is
Steve
-
Pic shows cap hit the cam lobe
Steve
-
Also had bullet center caps. Wonder if one of them let go? Pan still on it
Steve
-
Billet
Steve
-
Hate seeing stuff like this. I must be lucky. I'm out beating on my junk every weekend and I haven't had anything catastrophic happen yet.
-
yeah, this seems to be a freak accident...my first guess was a broken crank....cam lobe was hammered by the rod...pic thru the lifter bore shows cap is hammered...cra nk seems to turn all the way end to end when it is turned
Damn thing was running easy 11.0's with a stock dp and TE60 turbo at low boost....guess when the pan is off, we will see all the damage
-
Keith is wondering if the 3.625" stroker crank would allow the rod shoulder to hit the lobe if the chain broke first....I know the rod can be close to the lobe if the lift is enough because some strokers require a small base circle cam. I guess it is a question for Paul or someone else experienced with stroker cranks
-
I spoke to Weber Power Products this morning and said that clearance will be a factor if the chain breaks, they asked me to send pictures to them for evaluation.
-
four valves were hit, #1,3,4 rods were hit , still no proof of anything causing the chain to break
-
rods are ordered but looks like its going to be a slow process to put this thing back together. money is tight :(
-
I understand that! Take your time and do it right :)
-
Weber Called today and asked me to send the good connecting rods to them so they can get the balance as close as possible. So they will be in the mail tomorrow, I am guessing it will be 2-3 weeks before getting them back
-
received all the parts and put the engine back together, today finally put the motor back in :rock: . Still to this day have not figured out what cause the chain to break. Thanks for all the help. :cheers:
-
forgot to mention that I did have an issue getting the rollmaster gear bolts on the cam shaft to start, I seen other ppl having this problem, I will contact TA perf. to let them know about my issue.
-
did you hone the holes out, or what?
Sure glad to see it back together. After all that, I think the chain failed. You were running the engine easy for what it was....
-
forgot to mention that I did have an issue getting the rollmaster gear bolts on the cam shaft to start, I seen other ppl having this problem, I will contact TA perf. to let them know about my issue.
Read about the cam bolts not lining up...weird.
-
Yes Steve I did home the holes, was still a tight fit