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Thread: Interpreting compression & leak down numbers

  1. #11
    Join Date
    Jan 2006
    Location
    Seattle-ish
    Posts
    1,187

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    It's the same runner in the head and the TB. Here is better photo of that port and back of the valves. As you can see, it's very clean, just like the rest of the head. Although it looks like oil in the seal area, it's present to varying degrees on all of them, and it's a tacky consistency with a fuel odor. Given there is no way for oil to get there except through the valves or from a outside leak, my guess is it's a mixture of fuel and carbon giving it the color of oil. The Raceline/Jenvey DTHB are fed through a Pipercross sausage filter with nothing venting into that system.





    Thanks,
    John
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    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

  2. #12
    Join Date
    Feb 2009
    Location
    The Frozen Northeast
    Posts
    505

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    John.
    any chance that can be oil fouling the intake from your filter. I previously noted increased oil in my ITB trumpet after cleaning and re-oiling my foam air filter. and that appears to be on cylinder #1?

  3. #13
    Join Date
    Jan 2006
    Location
    Seattle-ish
    Posts
    1,187

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    Good idea, but everything is clean on the other side of the throttle plates. #2 also has the problem, but not to the same degree. I suspect that it's a combination of TB wear and dirty/failing injectors. Although the engine only has about 33k miles, it's been in the car for 15 years. I plan to speak with Pete at Raceline in the morning to discuss.

    Thanks,
    John
    '95 Westfield SEiW w/2.0L Duratec
    '68 Lotus Elan FHC
    '91 Miata w/Flyin Miata suspension & brakes
    '95 Porsche 993 C2
    '86 Porsche 944 turbo (neglected project car)
    Throttle Steer

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