motor help

[ohlde21]

Morroso pan. Valvoline VR1 50wt racing oil ..... im changing pumps and changing oil to Joe Gibbs 15-50 racing oil

[MM90]

I just had this conversation with my engine builder. My new engine has the block tapped at the camshaft so it reads oil pressure at the last thing to get oil instead of at the pump. He put an adjustable Melling HV oil pump in and cranked up the pressure on it. When I was racing in the middle of the corners the oil pressure would drop below 40 psi. It scared me because I have always read oil pressure at the pump. He said he didn't care if the oil drops below 20 psi cruising through the pits as long as you give it some throttle and the pressure raises right back up.

[JustAddDirt]

15-50 synthetic will probably make problem worse, over he vr1 50wt.

[Egoracing]

If this is happening 1-2 laps into the race I would lean to the fact that you do not have proper crank case ventilation and it is keeping the oil in the top of the engine. Are there breather tubes in the lifter valley and have the drain back holes been opened up?

[ohlde21]

Thanks guys all good stuff and questions....... the problem was cause by my oil pump houseing crackedand one of the trap doors stuck open allowing the oil to move to much the other thing i found is the size of the rings were wrong so some of the oil was blowing by the ring .... what do u guys think about joe gibbs 15-50 oil?

[JustAddDirt]

its good oil, just pricy