caswensk
05-22-2005, 06:46 AM
Okay, I will try to explain this clearly, and will add pics to illustrate. Any help is appreciated. I'm pulling my hair out, and wasting what little summer we get in Michigan! Please help...
The problem. Had a turn-key boat. Running waterlogs and a stock 12Jc pump on a 1976 455olds. No problems, but I wanted more. Added Basset headers and replaced the tired old berkeley with a new dominator pump with droop and divertor.
Soon after, I began blowing the recirculating hose from the top of the water pump to the bottom. Not sure what this does now, but once upon a time, this is the large hose that runs from the thermostat housing to the top of the radiator, than from the radiator back to the engine. The water pump is still installed but obviously no radiator, so it just loops from the top to the bottom. (Large hose about 1-1/2" or 2" diameter) This hose blew everytime I'd get on the throttle with the new pump/header set-up. Bent up a piece of aluminized exhaust pipe and presto, no more blowing that hose.
Then, I guess the water sought out the next weakest link. A 1/2" outlet from the water pump housing that's now capped with a rubber cap and hose clamp. This is now my weak point that blows anytime I jump on the throttle.
I have since added a 1/2" pressure regulator to the inlet hose between the pump and the engine. I set the valve to trip at garden hose pressure. (I have a well not city water... pretty poor pressure). If the valve trips, diverted water is directed overboard. In my head, this reduces the water ingoing to the engine, and would hopefully minimize the hose issues. Whether it helped or not... who knows, but it did not cure the problem. The same plug continues to blow.
I have picture that I marked-up showing the routing of my plumbing and my trouble areas. I will try to attach these. This is driving me nuts. And I'm out of ideas.
http://images.snapfish.com/34399%3A2723232%7Ffp4%3Enu%3D3257%3E8%3C6%3E232%3E WSNRCG%3D3232955373%3B45nu0mrj
http://images.snapfish.com/34399%3A2723232%7Ffp64%3Dot%3E2348%3D9%3B7%3D323%3 DXROQDF%3E2323864464%3A55ot1lsi
The problem. Had a turn-key boat. Running waterlogs and a stock 12Jc pump on a 1976 455olds. No problems, but I wanted more. Added Basset headers and replaced the tired old berkeley with a new dominator pump with droop and divertor.
Soon after, I began blowing the recirculating hose from the top of the water pump to the bottom. Not sure what this does now, but once upon a time, this is the large hose that runs from the thermostat housing to the top of the radiator, than from the radiator back to the engine. The water pump is still installed but obviously no radiator, so it just loops from the top to the bottom. (Large hose about 1-1/2" or 2" diameter) This hose blew everytime I'd get on the throttle with the new pump/header set-up. Bent up a piece of aluminized exhaust pipe and presto, no more blowing that hose.
Then, I guess the water sought out the next weakest link. A 1/2" outlet from the water pump housing that's now capped with a rubber cap and hose clamp. This is now my weak point that blows anytime I jump on the throttle.
I have since added a 1/2" pressure regulator to the inlet hose between the pump and the engine. I set the valve to trip at garden hose pressure. (I have a well not city water... pretty poor pressure). If the valve trips, diverted water is directed overboard. In my head, this reduces the water ingoing to the engine, and would hopefully minimize the hose issues. Whether it helped or not... who knows, but it did not cure the problem. The same plug continues to blow.
I have picture that I marked-up showing the routing of my plumbing and my trouble areas. I will try to attach these. This is driving me nuts. And I'm out of ideas.
http://images.snapfish.com/34399%3A2723232%7Ffp4%3Enu%3D3257%3E8%3C6%3E232%3E WSNRCG%3D3232955373%3B45nu0mrj
http://images.snapfish.com/34399%3A2723232%7Ffp64%3Dot%3E2348%3D9%3B7%3D323%3 DXROQDF%3E2323864464%3A55ot1lsi