Low Comp. Readings

Discussion in 'Race 400/430/455' started by RagTop69GS, May 21, 2002.

  1. RagTop69GS

    RagTop69GS Cruzin Motown ~Top Down

    Here's what I have, 69' GS 400 stock engine with 68,000 miles. freshly rebuilt carb, dwell & timing set to Fact. specs and I get low Vacuum reading .
    When I advance the timing to I'm guessing 15-20 deg. I get 16" of vac but hard starting and spark knock. I can find no Vac. leaks anywhere. Vac. guage was slightly jittery. I did a compression check and here's what I found.

    DRY DRY wet
    150 150
    145 125 155
    140 130 170
    180 155

    I only wet checked the two lowest cyl. which happen to be next to each other. I know this indicates poor ring seal. Is there anything I can do to make this last the season before I do a rebuild in the fall ?

    The car idles great, no smoke but has no power. When I step on it it dosen't bog but seem to lack any power.

    Any ideas on whats up with this engine. It ran good last season except for stalling when I stopped after about 2 or more hours of driving. Didn't stall till it was good and hot.

    Thanks Jay :confused:
  2. cray1801

    cray1801 Too much is just right.

    Jay, I'd suggest a leakdown test, this will help get the whole story without as much speculation.
  3. RagTop69GS

    RagTop69GS Cruzin Motown ~Top Down

    Thanks Craig, :TU:

    I'll be doing that this weekend. I'll post what I find.

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