01-07-2014, 04:34 PM
Tom,
I have questions. What vessel and what engines do you have?
1) Risers are made of cast iron. the raw water that is used to cool the fresh water and anti-freeze in the heat exchangers is mixed with engine exhaust in the risers and exits the vessel through the mufflers and out through the exhaust outlets. Over time the water will eventually corrode the inside of the risers. If the corrosion is allowed to expand too far, the riser will actually fail and dump raw water into the exhaust manifold and into the engine through the exhaust valves. Risers have a life span of about 5 to 7 years if well cared for.
2) Many Crusaders use a fresh water cooled exhaust manifold which if cared for properly could last 15 or 20 years. The kicker is if you allow the risers to fail and dump corrosive raw water spray into the exhaust manifold, that 15 or 20 years could turn into 5 to 7 or 10 in your case.
As far as cost, that depends on the quality of the parts you use. There are many companies building risers and manifolds that far exceed the quality of the original parts.
For standard original quality parts, I would think $1,200.00 to $1,500.00 per engine for risers and manifolds (small block - more for big blocks). If you go with fancy ceramic coated parts, you could double or triple that. If you have to do valve work, you could add another $1.5k - $2k per engine or more depending on which engines you are talking about.
Just ball park numbers. labor rates vary greatly from area to area.
Good Luck!
I have questions. What vessel and what engines do you have?
1) Risers are made of cast iron. the raw water that is used to cool the fresh water and anti-freeze in the heat exchangers is mixed with engine exhaust in the risers and exits the vessel through the mufflers and out through the exhaust outlets. Over time the water will eventually corrode the inside of the risers. If the corrosion is allowed to expand too far, the riser will actually fail and dump raw water into the exhaust manifold and into the engine through the exhaust valves. Risers have a life span of about 5 to 7 years if well cared for.
2) Many Crusaders use a fresh water cooled exhaust manifold which if cared for properly could last 15 or 20 years. The kicker is if you allow the risers to fail and dump corrosive raw water spray into the exhaust manifold, that 15 or 20 years could turn into 5 to 7 or 10 in your case.
As far as cost, that depends on the quality of the parts you use. There are many companies building risers and manifolds that far exceed the quality of the original parts.
For standard original quality parts, I would think $1,200.00 to $1,500.00 per engine for risers and manifolds (small block - more for big blocks). If you go with fancy ceramic coated parts, you could double or triple that. If you have to do valve work, you could add another $1.5k - $2k per engine or more depending on which engines you are talking about.
Just ball park numbers. labor rates vary greatly from area to area.
Good Luck!
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