Widow update....DEAD....AGAIN....yes this sucks!!!!
10-10-2009, 02:46 AM
#61
Rennlist Member
Listen to the video at 6:23+. That engine sounds like it is coming apart. Other noises than just rod knock here. I would want to know what the heck that all was!
mk
http://www.youtube.com/watch?v=fqvet8PTb_g
mk
http://www.youtube.com/watch?v=fqvet8PTb_g
10-10-2009, 09:27 AM
#62
In Your Face, Ace
Rennlist Member
Rennlist Member
10-10-2009, 10:57 AM
#63
Nordschleife Master
This is IMHO 100% a failure to properly inspect parts, tolerances, or proper cleaning. Which as Greg Nettles points out is very important. ESP on an engine that was torn down for spun rods before. If he had run it on the street this failure would have happened irregardless.
10-10-2009, 02:11 PM
#64
Former Sponsor
At first appearance, these engines seem so easy to build, yet so many never get more than a couple of hours on them, before they are turned to junk.
It is to the point where I almost expect this stuff. Sad.
There's a very short list of things can cause that. Perhaps one of the plugs from the crank drilling either was left out or fell out. Perhaps there was excessive sealant between the cradle and the block, restricting oil flow to the back of the engine. Perhaps there were improper rod bearing sizes used. Crank could have been wrong size or the rods were machined wrong. Not much else could do this to #4 and #8.
All of the above should have been detected/prevented when assembled.
It is to the point where I almost expect this stuff. Sad.
There's a very short list of things can cause that. Perhaps one of the plugs from the crank drilling either was left out or fell out. Perhaps there was excessive sealant between the cradle and the block, restricting oil flow to the back of the engine. Perhaps there were improper rod bearing sizes used. Crank could have been wrong size or the rods were machined wrong. Not much else could do this to #4 and #8.
All of the above should have been detected/prevented when assembled.
10-11-2009, 05:13 PM
#67
Race Director
Thread Starter
At first appearance, these engines seem so easy to build, yet so many never get more than a couple of hours on them, before they are turned to junk.
It is to the point where I almost expect this stuff. Sad.
There's a very short list of things can cause that. Perhaps one of the plugs from the crank drilling either was left out or fell out. Perhaps there was excessive sealant between the cradle and the block, restricting oil flow to the back of the engine. Perhaps there were improper rod bearing sizes used. Crank could have been wrong size or the rods were machined wrong. Not much else could do this to #4 and #8.
All of the above should have been detected/prevented when assembled.
It is to the point where I almost expect this stuff. Sad.
There's a very short list of things can cause that. Perhaps one of the plugs from the crank drilling either was left out or fell out. Perhaps there was excessive sealant between the cradle and the block, restricting oil flow to the back of the engine. Perhaps there were improper rod bearing sizes used. Crank could have been wrong size or the rods were machined wrong. Not much else could do this to #4 and #8.
All of the above should have been detected/prevented when assembled.
I agree 100%.......
10-12-2009, 05:45 AM
#68
Brian, add me to the condolence list, time to take time out, too stressful otherwise. I agree with Greg, my guess and that is all it is, is that the rod bearings were too tight, 4,8 were just tighter than the others, so they went first. Maybe if you can be bothered check the rod clearance.
If you don't have the tools just a quick check with flexiguage its cheap and will probably give you some insight. I would check the brand of bearings, if Glyco I think we will have a suspect as high revs and tight bearings normally don't get along. Or as it was once put to me, a tight bearing will make some more clearance for you.
If I missed it, what type of oil were you running? Have you looked at the cylinder wall on that cylinder, sometimes they get scratched when this happens.
Regards
Greg
If you don't have the tools just a quick check with flexiguage its cheap and will probably give you some insight. I would check the brand of bearings, if Glyco I think we will have a suspect as high revs and tight bearings normally don't get along. Or as it was once put to me, a tight bearing will make some more clearance for you.
If I missed it, what type of oil were you running? Have you looked at the cylinder wall on that cylinder, sometimes they get scratched when this happens.
Regards
Greg
