pentastarpro
speed trials
Looking for experience and advice on bypass hoses.
I have purchased a Champion 3core (thank you challengergary) for my 65 V 200 w/69' 340, X heads, .508/292dur purple stick. I have a Ebrock Performer w/ Holley 4165 and timing at 18 static/32 total. Plugs look perfect. This is a true 10.5cr motor w/170deg thermostat. I have two 9" Derrale fans on back side and NO shroud. After warm-up it still runs at 200-210 while cruising at 25-35mph. Highway temps drop to 180 and are steady. I've added a temporary fan in front of rad with no change in temps.
My question is - could the larger than stock bypass hose be circulating too much coolant around the radiator at lower speeds and creating the increased temps? I have noticed some later water pumps have smaller nipples (restrictors) for the bypass hose than the new direct replacement I have. I used a brass household water heater nipple (3/4") and turned the threads off the flared end so it fit the manifold and hose great. The original manifold nipple had a much smaller passage but was eaten away, hence my replacement.
I am thinking the extra flow through the bypass is causing the heat buildup rather than flowing through the rad. I could try putting a steel spacer/reducer (available at local OSH)inside the rubber hose to reduce flow as they come in various ID sizes.
Has anyone else tackled this issue other than throwing more radiator, shroud, or fans at it?
I have purchased a Champion 3core (thank you challengergary) for my 65 V 200 w/69' 340, X heads, .508/292dur purple stick. I have a Ebrock Performer w/ Holley 4165 and timing at 18 static/32 total. Plugs look perfect. This is a true 10.5cr motor w/170deg thermostat. I have two 9" Derrale fans on back side and NO shroud. After warm-up it still runs at 200-210 while cruising at 25-35mph. Highway temps drop to 180 and are steady. I've added a temporary fan in front of rad with no change in temps.
My question is - could the larger than stock bypass hose be circulating too much coolant around the radiator at lower speeds and creating the increased temps? I have noticed some later water pumps have smaller nipples (restrictors) for the bypass hose than the new direct replacement I have. I used a brass household water heater nipple (3/4") and turned the threads off the flared end so it fit the manifold and hose great. The original manifold nipple had a much smaller passage but was eaten away, hence my replacement.
I am thinking the extra flow through the bypass is causing the heat buildup rather than flowing through the rad. I could try putting a steel spacer/reducer (available at local OSH)inside the rubber hose to reduce flow as they come in various ID sizes.
Has anyone else tackled this issue other than throwing more radiator, shroud, or fans at it?