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Volumetric effecienty at 148% and rising


smokingwheels

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yes its me again hi all

Ive been revising the data collected of the past 6 years.

with such improvments i cant go and get some one to test my head flow

i would be giving techonogy away

i will have to build myself a flow rig

case 1

I have a ve of 148% above 2000 RPM

please correct me if im wrong.

ive calculated the air flow against a stocker

1 fill a 60 L garbage bag at idle 4-5 seconds ~.7 cm/min

2 vac secondary main jet flows fuel at ~2000 ~2.96 cm/min

3 deplete fuel supply with single pump delivery ~1.2l/min @6000 ~8.7 cm/min

derated because of its age the book states 1.4 L/min delivery rate, ive measured it at 1.2 L/min

case 2

I have a 7 psi boost for free above 2000

1 reduction in timing of 15 degrees @3000 = .3 deg per kpa boost

approx 50 kpa extra fuel n air is getting in

I know im not getting 210 Kw yet cause the stock exhaust system wont flow 10.35 cm/m ~ 400 cfm so im reasearching that

but the fuel its going in though so i must have a lot of back pressure.

any donations of parts would be put to good use

holley 500,400, 750 , cam, extractors to suite a L20b 4 banger

email me smokingwheels@yahoo.com

you can hear what it sounds like here

I can upload more if needed.

http://www.classiczcars.com/forums/showthread.php?t=18619

cheers

Greg

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  • 2 months later...
  • 5 months later...

Yes Ive got way too much time to play

I measured the output of the fuel pump a few months ago

Approx 1 L Min static

So I will have to measure what the carbie holds

Under test I ran out of fuel near the end of 2nd gear ~6000-6500 revs

I reverse Engineered the fuel useage, around 95 hp /L engine displacment

I dont know if its true, dyno places dont want to test a stock engine.

They just laugh, and say Im waisting my money, well the 1/4 mile is cheaper for a few runs anyway and its more realistic.

I read an artical in a mag about ways to inflate/deflate dyno results

1. placement of temp probe, for intake temp

2. use a fast acceleration ramp before mods to obtain lower hp readings

3. use a slow acceleration ramp after mods to improve hp readings

from memory the errors were as high as 50 kw in a 300 kw engine.

So beware of the settings some use to justify the results, I prefer to use the 1/4 mile way

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