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Christian Hubbell
Joined: 01 Feb 2006
Posts: 236
Location: United States, Michigan, Waterford
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 Posted: Mon Dec 19, 2011 8:37 pm Post subject: |
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The Wiseco has the higher dome and costs a bit more. It'll last a long while with just AutoX duty though. You'll need quite a few base gaskets too. I have some trick 1mm aluminum spacers so you dont need as many gaskets but I couldn't tell you where to get them from. Another thing is Wiseco recommends a little more clearance due to different expansion rates of forged vs cast aluminum but if you warm up slow you'll be alright.
The 05 pistons ring gap was a little larger than the Wiseco too so that's another plus for the Wiseco. |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Tue Dec 20, 2011 7:06 pm Post subject: |
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So now the fun begins. How to get the rtv'ed plugs out without destroying anything. There isn't much to use for leverage. I'm hoping that I won't have to drill them out.
I'm pretty sure it's an original '99 cylinder judging from the stampings and after looking into the exhaust and intake ports, it's definitely still stock.
I'm not too worried about longevity since we put so little time on these engines. It looks like we'll put about an hour and a half of run time per year.
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2002 Birel CR32V/ StockMoto w/PI |
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al nunley
Joined: 13 Nov 2006
Posts: 3066
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| Posted: Wed Dec 21, 2011 7:33 am Post subject: |
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| Tim Walsh wrote: |
I'm not too worried about longevity since we put so little time on these engines. It looks like we'll put about an hour and a half of run time per year. |
I have this spreadsheet for keeping track of "engine hours" at the track. In my test data, 1 1/2 hours is only about one trip to a race. (Give or take some. It will average out your lap times including fast/slow lap.) Maybe a little more on a good, productive, practice day. How many trips to the track do you make?
If you want the Excel spreadsheet, email me at anunley@austin.rr.com It works in any version of Excel, plus Open Office.
There's a lot of other helpful things included.
The ultimate gear ratio chart is something you might like. It's adjustable to your needs as far as engine and axle gears. You can see 20 different ranges at once, print them too, on 2 sides of one sheet of paper. Lot's of other other good stuff too.
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If the data does not support the theory, get a new theory. (Al Nunley)
All else being equal; Compression is the Holy Grail.
45 years, in and around karting |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Wed Dec 21, 2011 10:44 am Post subject: |
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Al,
This is autocross, so real load time is VERY short. I've run 5 events since we bought the kart, with average "lap times" between 25 and 50 seconds, and total number of "laps" between 10 and 23 per event(between 2 and 4 drivers of the kart, between 4 and 6 runs/driver).
I'm currently keeping a written log in a notebook since it's easy to log things in the garage vs. hauling down a laptop and keeping it running while I'm doing a post event inspection.
I think I already have your GearMaster sheet which has helped me out a lot. I'm definitely running too much gear, but I'm hoping that some more power will help out some of that. I think I'm in the 16:27 neighborhood right now. I have some questions on changing gears, but I'll save that for another thread. This one I'll leave to just motor work.
Here's the speed/distance chart from one of our smaller lots..
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2002 Birel CR32V/ StockMoto w/PI |
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Christian Hubbell
Joined: 01 Feb 2006
Posts: 236
Location: United States, Michigan, Waterford
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| Posted: Wed Dec 21, 2011 6:05 pm Post subject: |
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Ya, I did an open track day and was WOT for more time in one lap than I think I was in the last 5 auto crosses combined. I felt a little sad for my motor actually  |
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al nunley
Joined: 13 Nov 2006
Posts: 3066
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| Posted: Thu Dec 22, 2011 8:37 pm Post subject: |
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My collection of stuff is called nine sheets. You need Excel to use it. Or Open Office, which is a free down load.
_________________
If the data does not support the theory, get a new theory. (Al Nunley)
All else being equal; Compression is the Holy Grail.
45 years, in and around karting |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Mon Jan 02, 2012 3:52 pm Post subject: |
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As suspected the RS piston is a little taller. 
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2002 Birel CR32V/ StockMoto w/PI |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Mon Jan 02, 2012 5:28 pm Post subject: |
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So after playing with various base gaskets, should I be worried that the head isn't cut for an RS piston? The clearance profile is currently pretty interesting. The solder thins out pretty severely the beginning of the squish band and gets thicker(more clearance) the closer you get to the cylinder wall.
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2002 Birel CR32V/ StockMoto w/PI |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Tue Jan 03, 2012 5:13 pm Post subject: |
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I guess to finish up this thread, After much internal debate, I'm going to be going back to the stock '99 piston that was already in it, but with a much thinner base gasket. A 0.0015" gasket works out to be about 0.036"-0.037". Between that and the blended PV plugs I'm hoping to see at least a little more power. I'm not sure I want to be breaking untested ground with my first two stroke engine just after I've received it. I'm going to be looking out for another motor, or a core to build up another motor that will be closer to ideal for Stock Ignition.
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2002 Birel CR32V/ StockMoto w/PI |
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Christian Hubbell
Joined: 01 Feb 2006
Posts: 236
Location: United States, Michigan, Waterford
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| Posted: Wed Jan 04, 2012 6:39 am Post subject: |
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| That's interesting about your head, I am curious to see it but you made the right decision. With the corrected squish it'll have enough power, just ask the stock moto guys. Even more so with the head work. |
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Tim Walsh
Joined: 12 Sep 2011
Posts: 64
Location: United States, North Carolina, Winston-Salem
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| Posted: Wed Jan 04, 2012 6:55 am Post subject: |
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| Christian Hubbell wrote: | | That's interesting about your head, I am curious to see it but you made the right decision. With the corrected squish it'll have enough power, just ask the stock moto guys. Even more so with the head work. |
I feel like I'm punting on this one, but I think it'll give me less headaches down the road to just correct this motor without redesigning it, and then turn my attention to building a better engine. Be that a new cylinder/piston/head/pipe on my current bottom end, or a whole new unit, I dunno yet.
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