jd a cam timing

[johndeereman]

my dad told me that when he was a teanager he put my great granddads late model a back together wrong he had the camshaft gear one tooth off he said you couldnt stop the tractor when set up this way awsome horsepower turned the manifold white it was actually vaporizing the fuel before it entered the cylinder anybody ever try this? if so what way off do you put the cam? note tractor will only be used for pulling

 

[John T]

Oh Wellllllllll, until some mechanics and knowledgeable engine gents hit this, I will take a stab...... Seems to me any sort of advance valve timing ONLY comes into play where youre working at extreme high RPM's (like race cars NOT our 1000 RPM tractors) such that the volumetrics and air/fluid mechanics and air flow n turbulence n swirl etc etc dictate a valve has to open or close at times DIFFERENT FROM where its best to do so at lower RPM.

I JUST THINK THE JD ENGINEERS WOULD HAVE ALREADY TAKEN ALLLLLLL THAT INTO CONSIDERATION when designing for optimum performance at specific loads when taking temperatures and heat transfer and engine life into consideration. Most engineering decisions involve trade offs such as maybe different valve timing could gain a couple HP butttttttttt then they have to deal with different rates of heat transfer and mechanical stresses etc. It may be possible to gain HP but the engine would overheat or crap out sooner.

I guess if one were building a pull tractor and you want the absolute max HP there are indeed things to do that may kill the engine sooner but you really dont care about butttttttttttt the JD engineers had to design for regular farm work to optimize performance but subject to long engine life (trade offs)

I dont doubt theres all sorts of ways to pick up HP be it valve timing or other but all Ima sayin is IT INVOLVES A TRADE OFF AND SACRIFICE OF SOMETHING ELSE

Theres no free lunch, see the perpetual energy machine posting above

Somebody explain all this now

John T (better at tricity then engines)