F*****g # 7 again UPDATED WITH PICS!
06-03-2011, 01:04 PM
#1
F*****g # 7 again UPDATED WITH PICS! Well car started misfiring last week and I finally got hold of a snap-on scanner and although there was no ses light it read a #7 misfire
Compression test read 20lbs. on that cylinder. Gonna borrow a leakdown tester this weekend and go from there.
Hopefully it is not rings or piston but being # 7 I am kinda gun shy since it looked like this when it was pulled for the current motor...
Just had to vent
Compression test read 20lbs. on that cylinder. Gonna borrow a leakdown tester this weekend and go from there. Hopefully it is not rings or piston but being # 7 I am kinda gun shy since it looked like this when it was pulled for the current motor...
Just had to vent
Last edited by SOMbitch; 07-11-2011 at 10:46 PM.
06-03-2011, 02:04 PM
#4
Yes that piston is from the stock motor and yes it is possible it is from detonation or predetonation. I am not sure what caused it for sure but I would really GUESS running lean looking at the piston. CR was 11.2-1 on that motor btw.
The plug that came out of #7 of the present 403 motor was carboned up.... Motor has forged wiseco's and GFX rings so something went bad wrong if they failed...
06-03-2011, 04:31 PM
#5
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Wow that's weird and you said it happened before on the same cylinder? Same block or different block?
I hope it's nothing serious but from what you described it doesn't sound good.
I hope it's nothing serious but from what you described it doesn't sound good.
06-03-2011, 10:40 PM
#7
Just finished a leakdown and after getting #7 TDC motor turned a bit when hit with air....heard air out the exhaust so I am hopeful the problem is in the head and not the bottom.... no air sound out the crankcase which is a good sign.... a look under the valve cover is next so we will see what we find... valvetrain is quiet though so no obvious clues....
Been a shitty week altogether...maybe I'll elaborate later...
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07-06-2011, 06:48 PM
#11
Got the car somewhere I could work on it last week and pulled the VC this weekend and found a broken Yella Terra. RPM has me a pair in route and hope to have it running by the weekend time permitting... Jason suggested putting the stockers back on with the trunion upgrade so I'm thinking about it.....
07-06-2011, 09:29 PM
#12
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Got the car somewhere I could work on it last week and pulled the VC this weekend and found a broken Yella Terra. RPM has me a pair in route and hope to have it running by the weekend time permitting... Jason suggested putting the stockers back on with the trunion upgrade so I'm thinking about it.....
07-06-2011, 11:05 PM
#13
Maybe I need to start a thread about it. I would love to know the results of somebody running lots of miles on shimmed stock rocker TFS heads????
07-07-2011, 12:04 AM
#15
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I was under the impression that there was a very little weight difference between the stock trunion upgrades vs yella terra ultra lights. Swapped several times on my grandfathers vette with no noticeable difference in power.
No dyno to back that up though.
No dyno to back that up though.
07-08-2011, 06:10 PM
#16
Got the car somewhere I could work on it last week and pulled the VC this weekend and found a broken Yella Terra. RPM has me a pair in route and hope to have it running by the weekend time permitting... Jason suggested putting the stockers back on with the trunion upgrade so I'm thinking about it.....
Im hoping they were from the older batch thay had some issues with.
PM me a pic of the rocker....I can tell you if its the older or newer design.
Hey....its WAAAY better than a blown up piston!!
-Tony
