At 10:25 AM 12/20/2001 -0500, you wrote:
>
>fellow learkers and so forth mores
>
>I spent the day testing vanagons on a chassis dyno with mixed results. The
truth of the matter is that everything I thought I observed by the seat of
the pants method was wrong. First on the dyno was the big valve engine in
my 84 camper first run to warm the engine up made 50 hp at 3000 and a max
reading of 77 hp at 4600 RPM thats a nice start but the air fuel ratio was
a little
>now get back to work
>B.Bob Donalds

As you know, bolting on non-stock parts is folly without much testing and
refinement, moving you into necessary systems engineering. Without the
expense of empirical testing for factual data, seat-of-the-pants will bias
towards telling the ego it's a genius for being so wise as to spend
time/money and claim improvement. Such are all testamonials that sell
info-mercial merchandise.

I say stock ist beste because it is by far easier to get results by
sticking to factory proven system engineering. If stock isn't good enough
for you, re-consider what you need/want that stock can't provide. If you
have the budget to pursue new knowledge, God bless you and thanks for the
new data. If you don't, don't start by assuming the testamonials are true.
You sure can lunch your motor with some aftermarket bolt-on wizbang.

I would suggest that you consider testing with AFM's for larger capacity
engines and/or higher volume flow injectors to get the stock FI delivery
rate up to match the needs of the higher flow rate of larger valves with
higher lift. Don't forget how very critical a matching exhaust flow will
have. Custom intake requires custom balanced exhaust to really enhance flow
volume. Not enough or too much back pressure can render you untunable for
clean running under all loads and rpm's.

Compare your research facilities and budget with the factory and you get a
sence of the difficulty involved in doing the factory one better, at least
in regard to drivability and longevity. How many years of study and
refinement did it take for you to come up with a better valve lifter
adjustment procedure??? And that was merely a refinement of stock
procedure, not adaption of a non-stock part. It proves there is room for
improvement of factory procedures in very limited cases. The synergy of
stock systems function is typically upset by changing just one of many
parameters so without complete matching of all system components the result
is most often a loss of efficacy in some result.
T.P. Stephens
Doktor Tim's

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