help?

[cobra24]

hi i have 95 gsr but it make at noise like inside the engine when is hit like 3800 and is gone when pass 4300 what cant be the problem. how much would spend to rebuild my engine stock.

[Samhonda95]

if its a small knockin then quit driving it and change the rod bearings IF the crank isnt fu@ked

[cobra24]

thanks for you help but is not knockin is like something is loose inside the engine but onli when is hit like 3800 and is gone like 4300 thanks

[scttydb411]

sound like bb or unpopped popcorn rattling in a can? detonation.

[cobra24]

close to thanks

[scttydb411]

run 93 oct
check timing
tune

[southside]

Use Shells as much as possible they have ethanol blend and it helps...I heard shells 87 is higher than QT's 93 in Octane.Because the ethanol blend try that and see if it helps...