For those of you who this stuff intrest you..............Here is another mercury engine modified and running. This is one ofmy engines I wanted to get out from under my feet. I built it to get it out of the way. Of course it is far from stock. Here is what was done to it.</p>
The block had 2 bad holes in it. So I installed steel sleeves in cylinder 2 and 6. The other 4 are chrome bore. Yes, they look funny in the pics, but that is the way they are suppose to look. </p>
I can not port chrome cylinders without risking the chrome flaking. This will causeit to be re-plated ($800)so I did the next best thing, I decked thepistons .027. This will effectivly raise the port timing .027 as the port will open .027 sooner. Same as raising the port on the block. To keep everything portioned correctly, I decked theblock .027 also. This way raised the intake as well. This is the only down fall.This engine will peak in power at around 7K so the higher intake ports will help it. </p>
The pistons have a round booster port and single finger port passages. I change the shape of booser port to square. This allows alot more fuel to pass through the piston. The more fuel we get in the combustion chamber, the more power it will make. I also added 1 more finger port passage. </p>
The heads have been shaved to 32CC which will result in about 145-150 PSI of compression. This makes the engine havestronger bottom end and mid range power. It may add 1 to 2 mph on top but the biggest benefit is pulling power. It also makes the engine cheaper on fuel. Takes less throttle at lower speeds to maintain same speeds. </p>
The front 1/2 has been shaved .050. This makes the crankcase volume smaller. This will cause a stronger signal (vacuum) on the carbs due toless area to deplete. In other words, the crankcase goes into a vacuum sooner and has a stronger "pull" on the carbs. This pulls in more air and fuel. With more air and fuel in a smaller area, then when the crankcasegoes to a + pressure, the air and fuel mix is under more pressure. When the intake ports are opened, the air and fuel are transfered into the combustion chamber under greater velocity. In short this willpull in and move more air/fuel. </p>
I also done a cooling system mod which was removing a lip and adding a additonal hole. This will allowmore water to get around the heads and cool better. </p>
I also done some very light exhaust chest cut. This hasthe same chest as a bridgeport race engineI have. If it is good enough in stock for for8K, I will be good at 7K lightly modified.</p>
I cut the slag out of the rod slot area. This had enough that I put it on the mill to cut it to save time.</p>
I filled up the oil injection drive area. This will make cylinder #2 have the same(or close to) crankcase volume as the other 5 cylinders.This is a large void in cylinder 2 only. I fill it with a epoxy to take up volume.</p>
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After getting the electronic Gremlins KILLED... Had a bad switch box that was crossfiring other cylinders.....The engine is together and on Wes' bullet. Same lower, mid, ect. We just removed the 2.5 EFI and installed the 2.4 carb. It is turning a 26 chopper to 6300 coming out of the hole andis very quick when it bites. Strong hole shot, probably 1 boat lenth and getting stronger.It will set you back in the seat when it bites. I am proof. Sunday when we were out.....Came intothe no wake zone.I was taking my helmet off and had fliped the lens up. I had taken off my glasses offand had them in my left hand and was going to set them down, Wes goosed the throttle and it threw me back and my natural reaction was to try to catch myself by throwing my arm. Needless to say I threw my glasses about 15 feet off the side of the boat. So Tuesday went and got contacts so I can see until my glasses come in!!!!!emoBang Thanks Wes!emoBawl This should be a VERY strong engine. </p>
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Only thing I did not take a pic of is decking the block. emoSorry </p>
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</p>
</p>
</p>
The block had 2 bad holes in it. So I installed steel sleeves in cylinder 2 and 6. The other 4 are chrome bore. Yes, they look funny in the pics, but that is the way they are suppose to look. </p>
I can not port chrome cylinders without risking the chrome flaking. This will causeit to be re-plated ($800)so I did the next best thing, I decked thepistons .027. This will effectivly raise the port timing .027 as the port will open .027 sooner. Same as raising the port on the block. To keep everything portioned correctly, I decked theblock .027 also. This way raised the intake as well. This is the only down fall.This engine will peak in power at around 7K so the higher intake ports will help it. </p>
The pistons have a round booster port and single finger port passages. I change the shape of booser port to square. This allows alot more fuel to pass through the piston. The more fuel we get in the combustion chamber, the more power it will make. I also added 1 more finger port passage. </p>
The heads have been shaved to 32CC which will result in about 145-150 PSI of compression. This makes the engine havestronger bottom end and mid range power. It may add 1 to 2 mph on top but the biggest benefit is pulling power. It also makes the engine cheaper on fuel. Takes less throttle at lower speeds to maintain same speeds. </p>
The front 1/2 has been shaved .050. This makes the crankcase volume smaller. This will cause a stronger signal (vacuum) on the carbs due toless area to deplete. In other words, the crankcase goes into a vacuum sooner and has a stronger "pull" on the carbs. This pulls in more air and fuel. With more air and fuel in a smaller area, then when the crankcasegoes to a + pressure, the air and fuel mix is under more pressure. When the intake ports are opened, the air and fuel are transfered into the combustion chamber under greater velocity. In short this willpull in and move more air/fuel. </p>
I also done a cooling system mod which was removing a lip and adding a additonal hole. This will allowmore water to get around the heads and cool better. </p>
I also done some very light exhaust chest cut. This hasthe same chest as a bridgeport race engineI have. If it is good enough in stock for for8K, I will be good at 7K lightly modified.</p>
I cut the slag out of the rod slot area. This had enough that I put it on the mill to cut it to save time.</p>
I filled up the oil injection drive area. This will make cylinder #2 have the same(or close to) crankcase volume as the other 5 cylinders.This is a large void in cylinder 2 only. I fill it with a epoxy to take up volume.</p>
</p>
After getting the electronic Gremlins KILLED... Had a bad switch box that was crossfiring other cylinders.....The engine is together and on Wes' bullet. Same lower, mid, ect. We just removed the 2.5 EFI and installed the 2.4 carb. It is turning a 26 chopper to 6300 coming out of the hole andis very quick when it bites. Strong hole shot, probably 1 boat lenth and getting stronger.It will set you back in the seat when it bites. I am proof. Sunday when we were out.....Came intothe no wake zone.I was taking my helmet off and had fliped the lens up. I had taken off my glasses offand had them in my left hand and was going to set them down, Wes goosed the throttle and it threw me back and my natural reaction was to try to catch myself by throwing my arm. Needless to say I threw my glasses about 15 feet off the side of the boat. So Tuesday went and got contacts so I can see until my glasses come in!!!!!emoBang Thanks Wes!emoBawl This should be a VERY strong engine. </p>
</p>
Only thing I did not take a pic of is decking the block. emoSorry </p>
</p>
</p>
</p>
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