Hi Frans=2C my engine guy has been building racing engines most of his life
and has been
doing Soob aeroconversions for 6 yrs=2C has his own dyno and seems to know
his stuff.
I have never heard of an unhappy customer so I tend to believe him when he
says a
complete roller cam and rockers (not just the rockers) will add 15 hp. 15
hp seems
reasonable to me on a 150 hp engine. The camshaft requires a different pro
file to work
with the roller lifters and lift or duration will not be modified so as to
maintain good idle
characteristics. It is possible to open and close the valves quicker but o
verall duration
remains the same. Less friction = less heat or if you look at it another
way you can
burn less fuel to get the same power so again less heat.
Glenn
> Date: Wed=2C 18 Mar 2009 22:21:00 +0100
> From: frans@paardnatuurlijk.nl
> To: europa-list@matronics.com
> Subject: Re: Europa-List: Monowheel outrigger double downlock spring mod
>
l>
>
> glenn crowder wrote:
> > No recent upgrades to my engine although my engine guy really wants
> > to do a complete
> >
> > roller cam with roller lifters. He says this will add 15 hp and not
> > create any more heat
> >
> > since what we're actually doing is eliminating friction. The rollers
> > allow him to modify the cam profile a bit to take advantage.
>
> If you modify the cam profile=2C you are not just eliminating friction.
> You take advantage of the lessened friction to introduce a more
> aggresive cam profile=2C so the engine can digest more air and fuel. This
> addition of more air and fuel will certainly cause more heat. If you
> burn something=2C heat will develop. Burn more=2C and you will get more
> heat. =3B-)
> Think about this way: If the roller lifters save 15 hp=2C this means that
> the old lifters would somehow "consume" 15 hp. 15 hp is a tremendous
> amount of heat=2C the lifters would have melted if they were consuming
> these 15 hp's... So=2C this was obviously not the case=2C so these 15 hp'
s
> are coming from something else. =3B-)
>
> --
> Frans Veldman
>
>
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