|
Sorry got carried away a bit there, the rod length
will depend on the stroke you are looking at using, proposed comp ratio, piston
compression height etc. But yes generally, geometrically the longer rod
will be of an advantage.
Daniel Kroehn
----- Original Message -----
Sent: Monday, September 23, 2002 5:26
PM
Subject: Re: stroker motors
umm, he was asking about the rod lengths, not
stroke length
yes the longer the rods the better it is up high
int he revs, basically because the maximum angle of the rod to piston gets
less, the longer the rod is....if that makes sense...probly not, its hard to
explain....someone else got a better explaination???
----- Original Message -----
Sent: Monday, September 23, 2002 5:14
PM
Subject: Re: stroker motors
Basically you have a ratio of bore size to
stroke size. A typical L20B is a "square" engine, i.e. 1:1 bore to
stroke ratio. As the engine becomes more and more "undersquare"
(bigger stroke than bore diameter), the piston has to travel a greater
distance down the bore for a given engine rpm than a shorter stroke
engine. This means that the piston speed for the undersquare engine is
greater even though the engine rpm is the same as a shorter stroke
engine. Basically engine materials dictate maximum rpm that can be
achieved from a particular bore to stroke combination. The reason for
the high revving formula one engines is about a 2.5:1 bore to stroke ratio,
i.e big bore diameters and really short stroke, this cuts down the piston
speed to a level where the engine materials can handle it. But anyway
enough of my rambling, to answer your question, a shorter stroke engine will
have a tendancy to rev more than a longer stroke engine simple as
that.
Cheers
Daniel Kroehn
----- Original Message -----
Sent: Saturday, September 21, 2002
11:05 PM
Subject: stroker motors
guys, when building a motor using a stroker
crank, which is better....longer rods and shorter pistons? or shorter rods
and taller pistons?
I assume because increasing the stroke is
going to slightly reduce the engines ability to rev then longer rods and
shorter pistons would give back a little of the revability? or is it the
other way round?
Internal engine physics was never my thing,
any help would be greatly appretiated guys...I don't want the engine to
shake itself to death at high revs, and it will be seeing quite a bit of
boost too.
Dave
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