Answers to a few questions - the best way to route water , and this has been tested on a KZ kart engine , up to a TZ750 classic racer , is to pump the cold water in over the boost port.
This then flows forward over the transfers , then picks up the greatest heat load around the Exhaust duct , then passes up into the head.
The head is a catch 22 in that you want to cool the plug thread and squish area as much as possible , but keep the comustion chamber only , hot , to reduce throwing burn energy away via a big temp delta to the water.
I have dyno tested several versions of pin plugs in KZ engines , the latest being the laser welded tophat type , that allows stock pins and clips to be retained.
The first test was a full piston pin hole cover , with indexing , in plastic Torlon that utilised the clip for retention ( thanks Ken ).
This was worth about 1/2 Hp on a stock Aux port that had little port linking anyway.
But with very much enlarged Aux ports ( around to bore center ) the difference was closer to 2 Hp average.
But after two race meetings the lack of lubrication access from the transfer flow , into the piston /pin bearing area , caused the pin surface to turn blue.
Next test was a simple cap , laser welded slightly inside the pin end , this had maybe 0.25 Hp on a stock cylinder and 0.75 Hp down low on a big port cylinder ( they fell out as well ).
So caps operating just as a method of removing the pin interior volume from the system , worked , but achieved little.
Now I have just tested the top hat pins , beautifully laser welded , and these , with a new design big port cylinder were worth between 3.5 @ 10.000 and 1.5 Hp @ 14000 - no contest.
In the weekend just gone this traslated into 0.3 sec lap time reduction.
Re the Tandem twin balancing . Frits has detailed it all well as he would . Its impossible to run a Tandem at 180 , Kawasaki did it first here in NZ testing , the bike was absolutely impossible to ride , as Ballingtons/Mamola's
hands and balls went to sleep , and worse , it fell to bits.
A balance shaft is needed , but this adds inertia plus friction , and the 180 screamer firing achieves nothing.
The best layout ( for a bike ) I believe is a big parrallel twin ( KTM 250 GP ) but turn the cylinders around , and then add twin RV across the front driven by the balance shaft , needed anyway for 0-90 firing.
Using Flets RV gib system , then adds a huge bunch of power , and can then be used to delete the carb slide. Mk2 TPI will be designed into the castings , once TZ350 tells me how to control the ECU on a road race engine.
Dr Henise is CAD drawing this engine around my EngMod and sketch files as we speak.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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