525SC Weiand 177 On A 454 MAG in Formula 242LS
#31
Registered
Join Date: Jul 2009
Location: Grosse Pointe Farms, MI
Posts: 1,570
Likes: 0
Received 2 Likes
on
2 Posts
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
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.
#32
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
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
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
#33
Charter Member #927
Charter Member
#34
Charter Member # 55
Charter Member
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.
#35
Registered
Join Date: Nov 2001
Location: Pennsylvania
Posts: 3,385
Likes: 0
Received 0 Likes
on
0 Posts
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.
#36
Charter Member # 55
Charter Member
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.
#38
Registered
Thread Starter
Join Date: Feb 2008
Posts: 148
Likes: 0
Received 0 Likes
on
0 Posts
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.
#39
Charter Member # 55
Charter Member
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/
#40
Registered
Thread Starter
Join Date: Feb 2008
Posts: 148
Likes: 0
Received 0 Likes
on
0 Posts
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.