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525SC Weiand 177 On A 454 MAG in Formula 242LS

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Old 03-31-2011, 03:34 PM
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At WOT the whine takes some getting used to. The whine of my twin 177s could be heard over the exhaust and stereo system at WOT.

If you have room for a chiller I would highly recommend it. These little blowers make a ton of heat, and power loss after WOT runs is very noticable. Once it cools back down the power is back, so if you race someone wait about 30 mins before you race them again

4bus, do you run a risk of blowing anything up or gernading anything if you run it hot, or is it just a flat power loss (assuming everything else is tuned and cooled properly and not over-heating, of course)?

And, what RPM is safe to run at for distances (2.5 hour run or so)? 3200? 3800? 4000?

I'm just asking about SC complications, not general motor problems.
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Old 03-31-2011, 05:43 PM
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Originally Posted by 4bus View Post
At WOT the whine takes some getting used to. The whine of my twin 177s could be heard over the exhaust and stereo system at WOT.

If you have room for a chiller I would highly recommend it. These little blowers make a ton of heat, and power loss after WOT runs is very noticable. Once it cools back down the power is back, so if you race someone wait about 30 mins before you race them again
What rpm are those blowers spinning?
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Old 03-31-2011, 07:50 PM
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What rpm are those blowers spinning?
How is RPM figured? Bottom pulley 7" top pulley 3.25" = 2.15 underdriven x rpm say 4000 =8600 blower rpm?
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Old 04-01-2011, 02:12 AM
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How is RPM figured? Bottom pulley 7" top pulley 3.25" = 2.15 underdriven x rpm say 4000 =8600 blower rpm?
You are 2.15 OVERDRIVEN. Multiply 2.15 x your engine rpm.

I was about 2.5 overdriven on my 525SC and spun the engine to about 5250rpms. That spun the blower about 13,000rpms which is right at the recommended max rpm for it. I changed the blower lube every 25-30hrs and never had a problem. The 177 blower had about 500hrs on it.
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Old 04-01-2011, 07:33 AM
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Griff, did you ever note the loss of power after the blowers got hot like 4bus mentioned? I at 11,600rpm never noticed that and I run hard and long in poker runs and run no intercoolers. Just wondering if it is more prounounced at 13k rpm.
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Old 04-01-2011, 10:34 PM
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I usually only ran WOT for maybe 1-3mins. I never saw any power loss. WOT rpms stayed the same no matter how long I ran. I did see a very noticeable power loss due to high ambient air temps and high humidity. I could lose up to 200rpms on a 100* humid day compared to an 80* low humidity day.
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Old 04-01-2011, 10:44 PM
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Chiller,msd,balancer
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Old 04-03-2011, 10:22 PM
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I'm having some trouble find the right crank pulley. Anyone know where I can find a 5.5" or 6" 10 groove crank pulley or what part # I might look for from what manufacturer? Thanks.
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Old 04-04-2011, 02:46 AM
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I think this is what you need, but not 100% sure. You can also call the Holley Tech line at 270-781-9741 and discuss it with them to see if its the right one or if they know the part number for what you need. http://www.summitracing.com/parts/WND-93352/
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Old 04-13-2011, 09:09 AM
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Well I was disgusted to find out after collecting most parts for this project that i actually have a 330hp motor that someone disguised with the mag air cleaner and a different intake. I'm 99% sure the previous owner knew and scammed me. I confirmed by running the serial # off engine. I also called Formula and at least the engine is original to the boat. What would my 330 be worth to sell used and what is the average price of a good used mag? Thanks.
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