Msd

[hauss]

Two more things, First I have a 42 tooth pulley so, it is big on the water pump. 2nd all hoses are mushy feeling to me, maybe normal for backdraftt. I do not know.I do have one question what are normal water pump rpms .

[patrickt]

Originally Posted by hauss

Two more things, First I have a 42 tooth pulley so, it is big on the water pump. 2nd all hoses are mushy feeling to me, maybe normal for backdraftt. I do not know.I do have one question what are normal water pump rpms .

Jeez, I don't know how you'd even measure the RPMs of a pulley when your engine is revving, say, 2000 RPM. Does the pulley look a lot bigger than your friends' pulleys on similar engines? If it does, then you're probably under-driving it.

[patrickt]

Here's a really scientific test. This is my engine just after being built. Does your water pump pulley look bigger, smaller or about the same as what you see here and as compared to the crank pulley?

[patrickt]

Here's another shot with the engine in the car. I think, but have never measured it, that my water pump pulley is pretty much the same size as my crank pulley. So, that would mean it's turning at the same rate and same rpm.

[hauss]

5" on crank pulley 4 1/2" on water pump pulley. looking for backdraft hoses may just remove and bring to napa auto and see what they can come up with

[patrickt]

Originally Posted by hauss

5" on crank pulley 4 1/2" on water pump pulley.

That doesn't sound like the problem. You know, in most of the "I'm running too hot" threads that we've had around here (and when there wasn't something wrong with the engine) it usually came down to either the radiator was undersized, the airflow was not being directed through the radiator or the fans were not moving enough CFM.

[hauss]

first hoses 2nd fan 3rd radiator. That"s what I am thinking.

[cycleguy55]

Originally Posted by hauss

Two more things, First I have a 42 tooth pulley so, it is big on the water pump. 2nd all hoses are mushy feeling to me, maybe normal for backdraftt. I do not know.I do have one question what are normal water pump rpms .

If your lower rad hose feels soft or mushy there's a good chance it's collapsing at higher RPM. If you can squeeze it by hand enough that opposing sides can (or almost) touch each other that's almost a guaranty that it's collapsing. If it was doing that I'd replace it and ensure it has a spring inside to prevent that from happening.

Hint: I've salvaged a few stainless steel springs from rotor sprinkler heads (Rainbird) that have failed. Those springs are a great fit in a radiator hose.