mtbe, hc05

[John Hess]

Actually, according to Honda testing in the 70s, at higher RPMs, you 
might be better off with LOWER octane than needed to run at low RPM 
and under acceleration loads.  The higher the RPM, the less time 
available for a complete burn.  The higher the octane, the slower the 
burn.



----------
From:  James Weiler[SMTP:james at brc.ubc.ca]
Sent:  Wednesday, January 08, 1997 2:53 PM
To:  diy_efi at coulomb.eng.ohio-state.edu
Cc:  DIY_EFI at coulomb.eng.ohio-state.edu
Subject:  Re: mtbe, hc05



On Wed, 8 Jan 1997, tim gooding wrote:

>
> Hi all-
>
> Our team runs the WERA National Endurance series on a Yamaha YZF 
600.
> We've never had pre-ignition problems with the stock black box, and
> ~12.5:1 static compression ratio. We use 93 pump gas because its
> cheap(you burn a lot of gas endurance racing). I am curious if this 
mtbe
> stuff from the octane boost thread can give you a measureable power
> increase because it is "oxygenated". Powermist sells something for
> $16ish a gallon which is not practical here. If this stuff causes
> cancer, is it the sort of thing where you shouldn't be in the same
> county, or use gloves and a respirator when rejetting, or what?
>
Don't think octane gives you any more bang for you buck it will just
allow you to run under a load (or part throttle) with greater ignition 
advance without pinging.
MTBE as far as I know doesn't have any toxic side affects.  It's the
active ingredient in "104 octane boost".
cheers
jw