what are the advantages of using longer rods
#3
Senior Member
DYNO OPERATOR
Join Date: Apr 2008
Posts: 504
Yes, you are correct, the piston spends more time at top and bottom dead center meaning the dwell time is longer at top dead center the longer the rod. This allows more time for your fuel to be burned and push the piston down. This is the greatest advantage of rod length. The piston speed will be faster than a shorter rod between 15 degrees after TDC to 15 deg BBDC and so on.
Bruce
Bruce
#4
Senior Member
EXPERT BUILDER
Join Date: Nov 2009
Posts: 267
However... piston compression height LESS than 1.5 is not neccesarily a good thing...
http://victorylibrary.com/mopar/rod-tech-c.htm
http://victorylibrary.com/mopar/rod-tech-c.htm
#6
Senior Member
EXPERT BUILDER
Join Date: Jan 2005
Posts: 336
for a coin it has two sides,some think pick a piston for the application,pick a crank then where ever the rod ends up that it is least important,,,,
i perfer to keep its value important so my opinion is the three parts must be all considered in the rpm and environment involved-whether n,a, or a power adder
i perfer to keep its value important so my opinion is the three parts must be all considered in the rpm and environment involved-whether n,a, or a power adder
#7
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Join Date: Feb 2008
Posts: 3
#10
Senior Member
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Join Date: Nov 2009
Posts: 267
That's debateable... the theory is less sidewall pressure, but for every change there compensation somewhere else...?
A prominent local engine machinist/builder believes long rods are good for circle track engines for bottom end torque...?
Drag race engines...? well, long rods usually have to be used to make up big bore long stroke combinations of big stroker engines.
A prominent local engine machinist/builder believes long rods are good for circle track engines for bottom end torque...?
Drag race engines...? well, long rods usually have to be used to make up big bore long stroke combinations of big stroker engines.