353 500's vs. 525's
#11
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That is much stronger than I thought that package was, Perfect Storm, thanks for the info.
I wonder what the Ilmor boat will do when they dial it in. I was pretty shocked when it only ran 78. I believe those engines are a good bit lighter, and they are rated at 45 hp more each. It seems like that combo should be good for a solid 85
I wonder what the Ilmor boat will do when they dial it in. I was pretty shocked when it only ran 78. I believe those engines are a good bit lighter, and they are rated at 45 hp more each. It seems like that combo should be good for a solid 85
#12
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That is much stronger than I thought that package was, Perfect Storm, thanks for the info.
I wonder what the Ilmor boat will do when they dial it in. I was pretty shocked when it only ran 78. I believe those engines are a good bit lighter, and they are rated at 45 hp more each. It seems like that combo should be good for a solid 85
I wonder what the Ilmor boat will do when they dial it in. I was pretty shocked when it only ran 78. I believe those engines are a good bit lighter, and they are rated at 45 hp more each. It seems like that combo should be good for a solid 85
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I don't recall seeing heat exchangers on the 500's. Are they fresh water cooled like the 525's? A major consideration if you are in salt. Didn't they go to aluminum heads on the 525's?
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525's are closed cooling and the 500's are not. Fewer valve spring issues with the aluminum headed 525. 2-4 mph difference. I think everyone nailed it down pretty good.
No x dimension changes, but boxes made a 1-3 mph difference.
Dave
No x dimension changes, but boxes made a 1-3 mph difference.
Dave
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#16
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Took the boat out for our "new to us" first run on Lake Erie, launched out of Black River in Lorain, OH on Sunday 5-19-13. Spent 2 hours just learning the boat and its layout. Drives like to be trimmed in on launch with tabs neutral, keep it at 3,000 rpm and wait for it to hook-up. Trim out drive and let it run! Did a couple of speed runs and 83mph with 2 people and 3/4 tank of fuel, great way to cap off a good day.
#17
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Took the boat out for our "new to us" first run on Lake Erie, launched out of Black River in Lorain, OH on Sunday 5-19-13. Spent 2 hours just learning the boat and its layout. Drives like to be trimmed in on launch with tabs neutral, keep it at 3,000 rpm and wait for it to hook-up. Trim out drive and let it run! Did a couple of speed runs and 83mph with 2 people and 3/4 tank of fuel, great way to cap off a good day.
Dave
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#18
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I pulled some of my old power boat magazines out last night and in 2003 they tested 353 with 525s 33 labbed props 85 mph with Bob T at controls.
#19
Older thread about 353 and speed :-)
I know for a fact that there is a 353 Fastech in Sweden with merc 600 tuned dynoed at 711 hp, doing
100 mph at the gps. The owner is sure that there are a couple of mph more in it :-)
I know for a fact that there is a 353 Fastech in Sweden with merc 600 tuned dynoed at 711 hp, doing
100 mph at the gps. The owner is sure that there are a couple of mph more in it :-)
#20
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I have a 2000 353 with 500's and it will run 80 moderately loaded - 4 people and 1/2 tank of fuel, bravos 30p not labbed, no boxes, 280 hrs on the boat, although I rarely run it flat out, the ocean often doesn't cooperate. Great engines, no problems other than a fuel pump relay. The CMI's seem to last longer than on the 525's. I replaced mine two years ago although I had no leaks on the originals. Also replaced the original valve springs which also had no problems. I always fresh water flush the engines myself after a run in the ocean. Met a marina owner (fresh water) who had the same boat as mine, a year newer with 600 hrs and he told me he had never done anything to his engines other than regular maintenance like changing oil and had zero problems with them. He had not replaced the valve springs. My boat does have the changed x dimension that formula instituted I think in 2000.