sanman000719

so about a month ago i spun a rod bearing on the street, and the only reason i could figure out why was my pistons were lightly tapping the head. so i went with a cometic head gasket this time .050, and it shows no visible wear anymore. went with king bearings .030"

so i did some test, and tune this friday night and i finally have a great 60' time with a 1.63 best and first 1.60 60' in 3 years. well on my 3rd and final pass it spun a bearing again. same rod bearing as before.

anyone have any kind of idea as to why this might be happening.

i was thinking of rebuilding this again, but might just buy a differant short block

any help would be awsome

94turbosi

iTrader: (1)

Did u get the rods and crank inspected , checked clearances ect. Or did u just throw a new set of bearings ?

sanman000719

sure did replace 2 end caps

sanman000719

cransk/rods/psitons were all inspected

94turbosi

iTrader: (1)

Well since u have checked all of your machine work. And it damaged the same cylinder I would check your inj , ecu , wiring.

sanman000719

car had 10 runs on the dyno and 2 passes at the track and ran for a week on the street to see if it would have issue before traveling to tulsa.

was tuned to 34psi@737, and the passes at the track were at 20psi

Garage 808 Hatch

Clearances? That cylinder have any oil in? Anything look different in that combustion chamber than the others?

utahturbosohc

What do you have for crank case ventilation? A lot of guys are having trouble with all of the oil getting trapped in the head, due to it not being able to return back to the block from the head.

sanman000719

http://www.facebook.com/#!/photo.php...type=1&theater

SPOOLINmatt

i bet $1000 its a bad crank now. probably out of round. been in your shoes years ago...ive never spun a bearing since i solved that problem.

sanman000719

http://www.facebook.com/#!/photo.php...type=1&theater

vent is -12 in 2 -10's drain back


Matt has the crank polished after the first time

sanman000719

my bearings looked fine even the one that was mangled it just seems like it was pushed over and mushroomed

SPOOLINmatt

polishing will not solve it man.

sanman000719

yah my feeling is dumping this be16 and going back to a gsr

sanman000719

90sedan

I've spun a rod bearing before as well. Replaced the crank and rod and rechecked all the clearances and never had another issue. I'd bet that the crank and rod are way out round and will continue to spin bearings until replaced.

Just replace the crank and rod and bearings and be done with it, no sense in getting another short block unless you really want a gsr.

hello1320

This is a very basic problem.....message me please

SPOOLINmatt

i spun bearings like 3 times on the same rod before i figured out to not do it 3 times in a row ever again lol

sanman000719

new crank will be dropped in man, and a new set of rods as well probly just do the tt's while im at it