Was worth a crack
The new KE cylinder turned up yesterday
Whats special about that dirty old cylinder you ask? It has no liner! Its a full ali cylinder with nikasil bore
Had no idea Kawasaki made these cylinders with Nikasil bores but there you go. Sometimes you just luck out.
Was worth a crack
Interesting reading for racers of air coolers wanting to improve cooling through ducting/shrouding
http://naca.central.cranfield.ac.uk/...report-555.pdf - design principles for optimum cylinder shrouding/baffle, fin spacing, etc
http://x-jets.com/Design_for_optimum...efficiency.pdf - overview document with other interesting naca report references (type them into google)
Theres little that can be done to further cool the front of the cylinder (assuming its in free air) but shrouding can certainly aid in delivering an evenly cooled cylinder. The rear of air cooled motors get surprisingly hot, I found this out when I burnt my hand on the back edge of Robs cylinder head while we were testing on the dyno, it was hotter than the front/exhaust side!
Have seen a few different designs on line, not all of them make sense and even less conform to the NACA papers, this Vortex is probably the closest to what's required
Forum whore
I dont know why the links would not connect in your post so I found them and downloaded the pdf's.Originally Posted by kel
Was worth a crack
I've been working hard at trying to manage the motors heat. Wrapped the exhaust, added a 2mm copper spacer under the barrel (replacing the ali one) and formed it into a cylinder shroud. Sand blasted cylinder, head and cases and applied a very thin coat of flat black. Insulated under the fuel tank and the fuel lines and added a ram air to the air box (this added 1hp on the dyno with the fans feeding it).
I grabbed a thermal imaging camera from work to log the race temp and hopefully get some shots/info from the other air cooled 2 strokes
Took the bike to the track and it ran like a pig, a quick jaunt over to team head quarters and all fixed (thanks Rob) Managed to get back to the track to get a couple of races in but pretty much forgot about the camera
The one lot of photos I took were after a practice session, head temp of 96 degrees
So the jury is out on whether all the work has been worth while but the bike was embarrassingly fast and survived a very hot afternoon without drama.
Long Haired Yobbo
That camera is sooo cool!
I'd be interested to see some comparisons...
Heinz Varieties
Was worth a crack
Spent the morning at the track trying to dial out the front end slides the bike suffers from. First time I've bothered to use a methodical approach to suspension set up and it really paid dividends. Funny thing was after all the tweaking of the suspension settings it was tyre pressure adjustment that delivered the biggest gains.
So the bike is making 25hp for a full 3000 rpm (detuned the top end to last 40 laps), engine running temp seems to be under control, suspension seems to be working well, now all I have to do is stay on for 40 laps
Bring on the GP!
elbow down dreamer
You and your bike were looking good out there this morning Kel. It certainly likes to wheelie
Not racing tomorrow?
Was worth a crack
No. We are leaving for India the day after the GP, still lots to sort out so no racing tomorrow.
elbow down dreamer
Still trying to sort out how you're going to fit all those two stroke parts in your bags from india?
Was worth a crack
That would be a fail on both counts.
Didnt understand why the front slid out during practice nor did I understand why it did exactly the same thing in the race. Oh well qualifying was fun, the times suggested it would be a cracker of a race.
Well done to Nathaniel, Aaron
and Reegan
!
Im off to find a suspension guru to set up my bike.
Long Haired Yobbo
Mine slid heaps too, was just lucky enough to catch it each time.That would be a fail on both counts
Didnt understand why the front slid out during practice nor did I understand why it did exactly the same thing in the race. Oh well qualifying was fun, the times suggested it would be a cracker of a race.
Well done to Nathaniel
Im off to find a suspension guru to set up my bike.
I think that may be the 'other side' of running a GP bike; somewhat less... compliant.
Heinz Varieties
elbow down dreamer
Great to see the KERS out there again Kel even if you did bin it. I forgot to count the number of RS bikes there were this year, I think there were 10 or 11 last year. Did anyone?
i'm a wanker
heak and i see you have the newer front end 93-94 , don't know what it could be..wrong weight oil? i just bang mine in like all my bikes and set up soft .That would be a fail on both counts
Didnt understand why the front slid out during practice nor did I understand why it did exactly the same thing in the race. Oh well qualifying was fun, the times suggested it would be a cracker of a race.
Well done to Nathaniel
Im off to find a suspension guru to set up my bike.
No8 Wire Extraordinaire
Well a picture is worth a thousand words. Leave the old fat rider off & buy some smaller leathers for the Pedrosa sized replacement works rider.
. . .though I do remember the conversation going something like
"Dad, what happens when the needle goes above 14?"
"It can't its programed by the limiter"
"but what happens if it does?"
sounds like a challenge.
Don't you look at my accountant.
He's the only one I've got.
Forum whore
I took a little look and although no expert I reckoned it was all too hard front and back.
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