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I know rotaries. They are not that lite. They need a good oil supply and they are not that powerful without forced induction which takes carbs off the table usually. However, a 12a bridgeported naturally aspirated carb engine can reach 11k rpm and put out 225+ horsepower. They still race this...

My plan, and because its been too dang cold to test and tune in my home-town - is to stop here for about an hour or so - mainly on waiting for check-in at the beach hotel, but also because this area lends well for ski tuning in an easy launch area unlike the Daytona beach waves. Better to fix...

Zero day news just posted to YouTube. Krasharmy posted videos of how to work the cdi. Also how to mount the Reaper Sent from my iPhone using Tapatalk

Christmas upset. No ski under my tree. Sent from my iPhone using Tapatalk

So this is ok then In all seriousness, I brought an old mountain bike last time and it was perfect for getting around and even going to subway for lunch. I didn't have to give up my parking to go a mile down the road. Much faster than walking, and fit on the trailer no problem. Sent from...

No one mentioned try turfing the outside of your waterbox Sent from my iPhone using Tapatalk

And what do you know https://thekneeslider.com/diy-1000cc-v-twin-2-stroke-project/ Awsome Sent from my iPhone using Tapatalk

The trick would be to use a 90 degree v-twin as a v-4 would probably have less tq than a similar displacement twin. Big Pistons take big gulps and slap a big ass more than little pistons. Easier to fab. Lighter shorter crank. Carbs would be in the center of the twin. Maybe even just start...

Numbers need not apply. Here is a video I took of my cycling from the south-to-north end of the strip at the 2016 Daytona free ride. I was probably riding about 5 mph at points. https://www.facebook.com/eric.stoehr/videos/vb.688421509/10153198332541510/?type=3

Lucas additives for the win. Seriously, a working oil metering pump is a bit dynamic - at idle and low RPM - it could be mixing oil at 100:1. At full throttle; it could be pushing more like 24:1. What I do to fix the whole problem is carefully remove the precision oil pump as to not disturb...

You can try and find a painter who can add flex agent to the paint. It's what they use on bumpers sometimes. Still dries hard, but leaves it a little flexible. Most don't care though. Sent from my iPhone using Tapatalk

Hard to-do without some physical changes like sleeves, bottom decking, stroking etc. For the piston dome cc, I measured the dome height of the piston to be 4.78mm. This measurement was attained by flat-edge leveling the CENTER button of the piston with the cylinder while the head was removed...

Thanks Chuck, I may be confused, as that calculator is calling above the exhaust port TRAPPED compression ratio. I've definitely seen that calculator a bunch of times during my travels. That and similar calculators are calculating CR from above the exhaust port. I'm coming up with 8.5:1...

On the crank picture I see something different. Theres a pair of center seals directly in the MIDDLE of the crank. I guess the two chambers are completely isolated front to rear? How on earth would you rebuild the center seal on this crank? #10 in the image (There are 2x #10s) Also the...

The images for the kv crank are there, but the crankcase pictures are not posted. I did see this though under exhaust1. The ports on the exhaust header are trapezoids instead of squared. Also looks like they're using an oring for the headpipe. Sent from my iPhone using Tapatalk

Something new - not sure if this was posted already - but www.kraskindustries.com has some microfiche and parts catalogs for their RTP skis. The parts selection lists remind me of partzilla - searching for OEM parts. Looks pretty cool. http://krashindustries.com/parts-catalogue/2018/

Yup - I'm right at 15.2:1 on that calculator. That's a dynamic calculator.

LOL! I am my engine builder - in training

I'm trying to get my head-dome size correctly spec'd for C12 race fuel and need to know the best most accurate way of determining over-all CR for the fuel. I need to know if most calculate from the bottom of the stroke (IE full stroke aka 68mm for stock stroke), or from the top of the exhaust...

The box SmittySX sold me is going to work! Sent from my iPhone using Tapatalk