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Hello gentlemen. I have a brief but confusing question. As you may have
read in the past, I'm building a 377 SBC, suited to burn a 2%-3% mixture of
Nitromethane and 100 octane racing fuel from VP and my question is related as to
what I can expect to see for AFR readings, respectively. I have done some
research on the subject and have found out that Nitro is approx. 49.6% oxygen by
weight/volume and that increased fuel flow is expected, however, what I'm not
sure on, is how to determine if I need to concentrate on the already known 12.5
AFR as a tuning benchmark for proper combustion at WOT? This engine is
N/A.
The problem of fuel separation has been addressed and is not a factor here,
as there are additives to add to the racing fuel to keep the nitro reliably
suspended for up to six months; I've found a source for that.
Is my reasoning correct to think that I can tune the engine conventionally
on 100 octane race fuel to start out with, so that I give myself a benchmark of
correct AFR, then switch to the exotic fuel and see where the addition of it
places my AFR in relation to the original tuning curve? I would think that given
the relatively small amount of nitro actually in the fuel, that I could still
tune the engine's AFR as if it were gasoline only. Afterall, nitro is
essentially adding an oxygenant to the fuel the same as N.O.S. would...correct?
I don't know if the other by-products of nitro would effect this. Any
ideas?
Thanks in advance.
Regards....
Phil Rickard- Engine builder/Tuner, Les Stanford-Pirate Racing Corvette
C5R......Formerly with L.P.E.
vettebuilder@skyenet.net |