Engine/Transmission (1994 - 1998) Safe PSI limit on stock engine?

[CToney]

Arthr31 take Voodoo Truckers advice and retorque your headbolts. I wish I had retorqued my headbolts before I started bombing. My engine obviously was not one torqued properly. I like to err on the side of caution as I have made too many expensive mistakes in the past. I would retorque and keep boost under 35psi as the drive pressure and cylinder pressure increases quite quickly when you get over that. If my memory serves me correctly 40 or 45 psi is 70 psi drive pressure. Not efficient or good for stuff. We have a 5. 9L in a tractor and the stock timing is 14. 5 and an 8. 3L with 17 degrees of timing but both have stock fueling the 5. 9 is 120hp and the 8. 3 is 230 hp. I don't know how it applies to our B series engines but on the Pittsburgh diesel website they talk about 855 cummins and how too much timing kills engines from a longevity standpoint. The high cylinder pressure creates more strain on rod and main bearings and leads to premature failure. They preach low compression and slow timing too make high hp last a long time. I know very few of us put on a million miles but, it has to have some merit on our little 5. 9L.

 

[Voodoo Trucker]

Arthr31 take Voodoo Truckers advice and retorque your headbolts. I wish I had retorqued my headbolts before I started bombing. My engine obviously was not one torqued properly. I like to err on the side of caution as I have made too many expensive mistakes in the past. I would retorque and keep boost under 35psi as the drive pressure and cylinder pressure increases quite quickly when you get over that. If my memory serves me correctly 40 or 45 psi is 70 psi drive pressure. Not efficient or good for stuff. We have a 5. 9L in a tractor and the stock timing is 14. 5 and an 8. 3L with 17 degrees of timing but both have stock fueling the 5. 9 is 120hp and the 8. 3 is 230 hp. I don't know how it applies to our B series engines but on the Pittsburgh diesel website they talk about 855 cummins and how too much timing kills engines from a longevity standpoint. The high cylinder pressure creates more strain on rod and main bearings and leads to premature failure. They preach low compression and slow timing too make high hp last a long time. I know very few of us put on a million miles but, it has to have some merit on our little 5. 9L.

Mr. C is right about the turbo drive psi. I ran over 40psi with my stock 35 12mm housing drag racing with no problems. I don't recommend it forever, so you might want to think about putting a bigger turbin housing on it or a more efficient tubo with a bigger turbine housing, I would do the latter.