Re: stroker motors

[Daniel Kroehn]

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 ----- From: David Costello To: [EMAIL PROTECTED] 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 --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/membersozdat@datascribe.com.au/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/membersozdat@datascribe.com.au/ ---------------------------------------------------------------------