I have one exactly the same as these pictures, deflector, crankcase stamped 322, no signs of extra holes under tie bar, single carb, there are pictures on here from 2009 see thread "Konig - know what...
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I have one exactly the same as these pictures, deflector, crankcase stamped 322, no signs of extra holes under tie bar, single carb, there are pictures on here from 2009 see thread "Konig - know what...
I've used a Velocitek speedpuck, great speedo, big numbers & saves speed & track, but no revs, for about a year, Excellent!
But I'm told there are some new kart loggers that do the same & record...
Both cable attachment holes & the center of the pivot should be in a straight line, for the best geometry.
Without a suitable load very little throttle is required to reach maximum revs, little throttle = little fuel = insufficient lubricant!
Too much water coming out of mid?
The problem with copying the megaphone lengh from another similar motor is that the powerheads are similar, not identical.
The length of the pipe is dependant on the exhaust port duration, & the...
Cooling the Megaphone & the exhaust gas, increases the gas density & changes the speed of sound causing the exhaust to appear longer than it is, lowering the powerband revs, just the same as an...
Jennings is a very good first book to read on this subject, but there are several more that offer a slightly different viewpoint & are more up to date.
Try, Two-stroke Performance Tuning by A...
Sorry my mistake as it looked like you were calculating the exhaust tuner length for a 3 cylinder motor with an equal length 3 into 1 tuner.
I wasn't aware you could apply Helmholtz to reeds, I...
Where does the exhaust port duration come into this calculation?
I'd agree with Mr Lo, Tig is the only way to go.
This stuff is way harder than ally, & you have to get the whole job hot as your using a gas torch that when it cools the ally has a much greater...
Are you saying it broke after repairing with dura fix?
http://www.ebay.co.uk/itm/260690665272?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649
Sorry it's the UK ebay
Or if you plan on more than 10,000 revs buy a Hong Kong one from Ebay almost half the price inc postage, programable for all the different engine configs, a lot of guys use them over here, I must...
Tim the axial-uni flow expression depends of who's work you read last.
Using someone elses cylinder block precluded the use of 360 degree ports & I wanted to get any heat away from the lower...
Thanks for that Jeff, but I was rather hoping one of the techies would have torn it apart techniically if there were major flaws in my logic.
A couple of years ago I gave a lot of thought to building a 3 cylinder axial flow turbo 2 stroke, the idea was to use a commercial 2 stroke block with replacable liners, the head was to have 2...
30mm is a lot of carb for 100cc @ only 6k, is it the standard one?
See if you can borrow a slightly smaller carb 28 or 25 the increased gas velocity might have a positive effect on crankcase filling...
25 is pretty good for a 5 horse motor is this the Tohatsu one, what size/ make carb, what lower unit gear ratio, through the hub or over the prop exhaust, is it a liner powerhead & can you still buy...
You'll find quite a lot more intake science in The High-Performance Two-Stroke Engine by Dr. John C. Dixon. isbn 1 84425 045 8
As it was first published in 2005 it's a generation newer than...
Thanks Outlaw that answered my question, so removing the cooling on the tuner makes is seem shorter to the exhaust pulses raising the "powerband" by 100+ revs.
What does blocking the leg water outlet achieve?
Because when I've had them block accidently (not on a Merc) I burnt the paint on the leg didn't do the swivel rubbers a lot of good & melted around...
You can make the pipe appear longer by squirting cooling water over it.
Have a look on you tube at NZ jet boat type vids, most of the glass boats have a Duralumin outer layer as a sacrificial skin for snow melt river work.
Interesting question, is it the flow rate you should be measuring or is it the fuels ability to atomize with varying oil percentages, or perhaps both.
With a wide open carb attached to a decent...
More compression, tends to give more heat & a faster burn so you might well benifit from slightly reduced ignition advance.
The pistons will also run hotter so increasing a jet size could have a...
you might find prices on Malossi or Jasil's web sites.
All of these companies provide bolt on extra power, for kids to use on their twist & go scooters.
As for boat racing use just check out...
Perhaps the hardest part is going to be lowering the revs,to a suitable range without the use of a huge crownwheel or by using a sexy planetary reduction box somewhere in the leg.
Unless Ron has...
You'd better tell them about the water conditions you plan to run this in.
Not a lot of flat fresh water in Bermuda, (only in swimming pools) 40mph on south shore might be a very rough wet ride!
It might be worth checking what the silicon content was in the origonal pistons, JP only seem to do 10%.
If I remember right high performance pistons have a much higher Si content to limit expansion.
Before you follow zul8tr thoughts, who I'd guess is bang on the money, & build a dividing wall.
See if you can seperate the butterflys so that they are actuated by separate cables, if you have a...
Check my maths please.
A 12" x 12" prop will have the same tip angle as a 20 foot prop with 20 foot pitch.
A 12" pitch prop will only have a pitch angle of 45 degrees, 2.7" from the centre...
Looking at pictures of those props the pitch looks more than 16 foot & the stuff I read said maximum revs 200.
What was the hull speed?
As I understood it, slip is the difference between the theoretical speed & the actual speed
i.e. if you have a 12" pitch prop running at 5000 revs, your theoretical speed would be 12" x 5000 x 60...
Has anyone got any bright ideas on home built dyno's for under 12hp motors?
Was the opposed twin a common crankcase twin or 2 singles firing at the same time, in 69 this would be cross scavenged with fractured steel rods wouldn't it?
High crankcase compression seems to...
82.5 would be just a number to OMC, their next question would be where's that coming from? that's a full strip down & measure, that's the chapter I'd love to read.
The next chapter if there is...
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Well I for one, can't wait for you to start a new thread & let me have a look at that Konig stuff.
If you lived a bit closer I'd be over trying to photocopy it for bedtime reading.
If...
I dunno Sam, I thought that was an A+ answer.
Clear & to the point, no numbers plucked from thin air, references quoted, & 100% accurate.
Thanks that's fascinating, was a reason ever reached to account for these rises & is it safe to assume that due to your location all temps are in F?
All the interesting info was garnered in the...
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Where were you measuring those temperature changes?
coolant, plug, exhaust gas, or are we talking air cooled.
Why were the manufacturers running avgas? wouldn't this give answers that...
Was that benzene or butane Sam?
I'm not sure it's as clearcut as that, there's a whole lot of other factors that could affect your conclusion.
Motor design, types of bearings, cylinder wall type/condition, number & style of...
Do you stuff reed cages Tim.
That's a very interesting point, has anyone seen any figures or creditable paperwork on this area.
What percentage of the semi particulate oil vapourises & joins the fuel & what stays as a...
What I think Fred meant to say was " in competition engines lean doesn't increase power" as they're running as lean as they dare.
I have no doubt that in motors that are not running on the edge of...
Impressive 55H figures Tim, are the test results on the net?
Test first the 060 jet with the 25:1 & see if it makes any difference, remember doubling the lube, might colour the plug.
Freds the man to ask, he seems to have tried every permutation.
I do! & have.
Fully synthetic has sometimes required a smaller jet.
Sam fill a coke bottle with oil & then fill one with straight gasoline, then time how long it takes to empty the bottles, I know this is a bit extreme but it's just to prove a point.
The...