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08-04-2007, 06:08 PM #1
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- Jul 2007
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13/18 Solas/SS Wear Ring = 700 rpm drop from stock 10/21 :(
Stock Challenger 180 215hp. Now 2 hours on boat.
Chewed Stock impeller and wear ring being stupid. Lesson learned.
I did the swap earlier this week to 13/18 from Solas and SS wear ring.
I do feel hole shot is better, but I can't really say how much.
However, with stock 10/21 impeller, I was hitting 8250 rpms. I was not even giving it full throttle. Now I am getting 7550 at full throttle.
Top speed today was 44 mph on pretty calm water at full throttle ( I believe in full throttle once in a while during break in period. I am not hitting it for more than maybe 10 seconds at a time...and only two or three times each time out.) I think the top speed with the 10/21 stock impeller was 47 or 48. I have no GPS yet, so this is strickly from the dream-o-meter.
QUESTION: Did I screw something up during the install? I don't believe I am cavatating at all. Is it possible that I am getting a 700 rpm loss just from the new impeller and SS wear ring?
Please help.
Jim
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08-04-2007, 09:30 PM #2
- Join Date
- Jan 2007
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- Lakeland, FL
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- 1,414
When I went from stock to the 13/18 (& SS wear ring), my RPMs went up +100 to 8150, holeshot and accel went up dramatically, and top speed either stayed the same or went down not more than a half of a mile an hour. A couple of engine-hours later, when I added +1 to the trailing edge of the fins, I remember one was off by -2 from the others. Maybe you have a fin or two on the new prop that are way off. I can't imagine how you could mess up the pump re-installation enough to account for that RPM loss.
To me, you turning 7550 now isn't nearly as strange as you turning 8250 with the stock prop during the first two hours of break-in. A more normal RPM to be turning at WOT, in the first hour of a stock boat, in the middle of the summer, would have been more like 7700-7800.
You've got to take that new prop out and check it; if I were you, I'd throw the stocker back on there in the meantime and see how it behaves. You've got to make sure that SC (washers) isn't starting to act up on you. Soon you'll be able to take that pump on and off like a NASCAR pit crew.
If you're going to mod, you can't really be sure of the benefits until you at least get a cheap GPS, though.
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08-08-2007, 07:52 AM #3
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- Jul 2007
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- 39
Thanks for the reply. I appreciate your insight.
The stock prop is chewed on the leading edge or I would definately throw it back in right away to see if that makes a difference. I was definately surprised by the stock RPMs as well. Again, I am not staring at the gauges all the time, but the highest I saw was 8250.
GPS is my next purchase.
Two questions.
Would the supercharger washers slipping account for RPM loss?
and...
Where is a good place to send a stock or aftermarket prop to be pitch blocked and have leading edge nicks worked out?
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08-08-2007, 07:55 AM #4
when going with a larger prop you need to put on some power adders to get your rpms back up, i would do intake and see what happens
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08-08-2007, 08:21 AM #5
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- Jul 2007
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- 39
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08-08-2007, 08:44 AM #6
I put on a solas 11/19 which is steeper than the stock and I went from 7300 rpm to 6500. It takes more power to push a steeper prop.
also when you saw the 8200 were you airborne for a second? If prop is out of the water it can spin up briefly.
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08-08-2007, 08:59 AM #7
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- Jul 2007
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- 39
Could be that the 8200 was while sliding and spinning...love these boats.
I do know that I am not full of crap and that I saw 8250. Unfortunately, I was only an hour into the break in before I chewed the stock wear ring and impeller and I didn't make much note of wide open throttle passes regarding RPMs. I know that I hit 47/48 mph though.
I guess I am not really concerned about the loss of RPM considering that I don't plan on modding too much. The holeshot is definately better with the new prop over stock. Top end seemed to drop by 3-4 mph. Not a huge deal for me, since where I boat I am not able to hit top speed for that long anyway.
I like the idea of an intake to raise the rpms back up a little, but I am not sure how to set it up. Don't seem to be a lot of C180 folks on this forum.
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08-08-2007, 04:55 PM #8
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- Jan 2007
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- Lakeland, FL
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when going with a larger prop you need to put on some power adders to get your rpms back up
Won't an intake void my warranty?
I am not staring at the gauges all the time, but the highest I saw was 8250.
Would the supercharger washers slipping account for RPM loss?
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08-08-2007, 05:04 PM #9
Maybe you could check to see if your intercooler is clogged. That could account for a loss in rpm. Depending on what you hit to damage your prop, maybe a bunch of crap got packed up into the intercooler -- just a guess...
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08-09-2007, 12:14 AM #10
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- Jan 2006
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- Taylor, MI 48180
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Send your damaged impeller to impros for repairs should be between 50-75 dollars. Then reinstall the stocker and start from there. BTW if you still have your stock ceramic SC washers in there your about to learn hard lesson #2 when you blow the SC clutch. Get the metal washers!!!!
www.impros.com
TCR
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