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hcoles hcoles is offline
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Join Date: Mar 2005
Location: Saratoga CA
Posts: 3,486
Snowman - interesting idea. When "they" say percent leakdown I assume they are describing:
for a one gauge system - no flow pressure vs. flowing into cylinder pressure, e.g. 100psi and 95psi is 5% leak down
for a two gauge system - e.g. first gauge 100psi and second 95psi = 5% leakdown

If all other things are equal if the orfice is changed I think the leakdown percentages will change. For probably a number of reasons, maybe for the range of cylinder sizes in a typical auto the orfice size showing up the most is 0.040" dia.

For other pressures supplied instead of 100psi you could be correct the % leak down may be about the same.

1989 3.2 coupe, DIY top end at 77k, now 112k
Old 07-26-2005, 07:16 AM
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