Which immediatly begs the question, how high would it rev if the stroke
was more in line with the bore. In otherwords an "oversquare" engine.
They builders of the high reving long stroke engines is a case of
ingenuity and dedication overcoming built in design limitations.
Rick Morrison
72 MGBGT
74 Midget
On Sun, 4 Jan 1998 18:43:14 +1100 "Mike Gigante" <mikeg@vicnet.net.au>
writes:
>Well if long stroke is the reason, then how come an 1100 race spridget
>can
>pull 8200 rpm in top gear? This is fact.
>
>While it is true that long stroke makes things more difficult, the
>reason
>may not
>be what you think.
>
>I'll say again that the key to high rpm is the engines ability to suck
>fuel/air mixture
>into the combustion chamber. It so happens that with long stroke, you
>are
>forced
>to use smaller valves than you would otherwise choose to (long stroke
>means
>smaller
>bore for the same capacity; smaller bore means less cross sectional
>area for
>the valves)
>
>Even so, a long stroker like the 1098cc engine can still be made to
>pull
>high relatively
>high RPM by a combination of cam, porting and big (as possible)
>valves. In
>lower gears
>it would happily pull 9 or 10,000 if allowed to (just before the crank
>breaks :-)
>
>Mike
>
>
>----------------------------------------------------------------------------
>--------------------------------------
>Mike Gigante mikeg@vicnet.net.au
>Watsons Creek Vineyard
>http://www.vicnet.net.au/~mikeg
>----------------------------------------------------------------------------
>--------------------------------------
>-----Original Message-----
>From: Bob MGT <BobMGT@aol.com>
>To: mgs@autox.team.net <mgs@autox.team.net>
>Date: Friday, January 02, 1998 2:56 PM
>Subject: Re: MGA superiority, long strokes, RBB stuff, Fergussons,
>Venoliaslugs
>
>
>>There's all this talk about how long stroke engines won't rev. Does a
>long
>>stroke engine design have any advantages? Better torque maybe?
>>
>>Bob Donahue (Still stuck in the '50s)
>>EMAIL - BOBMGT@AOL.COM
>>52 MGTD - under DIY restoration NEMGTR #11470
>>71 MGB - AMGBA #96-12029, NAMGBR #7-3336
>>
>
>
|