Temple for the tuners?
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- Oil Injector
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Forgetting about the KIPS subchamber which works better than a power valve.It matters if you want the most HP/torque available to you, simple fact that main open first makes the best mid range and top end,you DO NOT loose mid range(because you add so much more Blowdown angle area). Open together you loose mid range and no gain on top, Subs open first is what you have now probably in between the 2.The main open first/sub next has been tested and proved by the best there is utilised ad nauseum in just about every triple port cylinder there is except the KR-1.
With Avgas advance maybe the extra comp adds heat to combustion, reality is less advance more comp and leaner with avgas the reverse for ULP.
With Avgas advance maybe the extra comp adds heat to combustion, reality is less advance more comp and leaner with avgas the reverse for ULP.
crochet & croquet
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- Premix Junkie
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I point you in the direction of Krazy-Katts dyno room Krazy-Katts dyno room
Show me where one of your conventionally ported engines makes more torque than the incorrectly ported KR engine
Show me where one of your conventionally ported engines makes more torque than the incorrectly ported KR engine
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- Heavy Smoker
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- Premix Junkie
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Dave they are dynopro
Barry Booths VJ22 made 74~75hp on a dynojet. On Krazy-Katts dynopro the same bike made 66~67hp.
James (Krazy-Katt) is worth a visit, he likes two strokes
A fair number of F250 machines have been on James' dyno though not all owners will allow him to post the curves.
KR is a stonking motor which out grunts any other proddy 250 but lacks horse power as nobody has played with getting them to rev.
With cranks NLA I can't see the point in chasing RPM (HP). I am investigating an alternative two piece crank design that joins underneath a modified balance gear. This would effectively be like two single MX cranks so rebuild costs will be lower and maintenance easier. It also makes the webs much cheaper and easier to make.
Barry Booths VJ22 made 74~75hp on a dynojet. On Krazy-Katts dynopro the same bike made 66~67hp.
James (Krazy-Katt) is worth a visit, he likes two strokes
A fair number of F250 machines have been on James' dyno though not all owners will allow him to post the curves.
KR is a stonking motor which out grunts any other proddy 250 but lacks horse power as nobody has played with getting them to rev.
With cranks NLA I can't see the point in chasing RPM (HP). I am investigating an alternative two piece crank design that joins underneath a modified balance gear. This would effectively be like two single MX cranks so rebuild costs will be lower and maintenance easier. It also makes the webs much cheaper and easier to make.
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- Oil Injector
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Right here "off ther street"mj43 wrote:I point you in the direction of Krazy-Katts dyno room Krazy-Katts dyno room
Show me where one of your conventionally ported engines makes more torque than the incorrectly ported KR engine
KR-1 crank looks like it needs thicker thrust washers and a 18 roller big end bearing, the same bearing as a TZ 250/125(and anything else that revs it's tits off).
crochet & croquet
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- Oil Injector
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- Oil Injector
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The 3xv and nsr250 mc21 are restricted to 45hp in stock form whereas the rest of the bikes on that chart aren't restricted.
Below is a graph showing a stock 3xv (green line) and a blueprinted 3xv with aftermarket pipes and stock ignition (powervalve stays low for a long time):
James will no doubt improve on the above curve when he gets a programmable on the bike.
The stock pipes are designed to do one thing and that is to make the best of the 45hp limit that the jap legislators imposed.
Dan
Below is a graph showing a stock 3xv (green line) and a blueprinted 3xv with aftermarket pipes and stock ignition (powervalve stays low for a long time):
James will no doubt improve on the above curve when he gets a programmable on the bike.
The stock pipes are designed to do one thing and that is to make the best of the 45hp limit that the jap legislators imposed.
Dan