[V8] MPG Partial Update

[Ingo Rautenberg]

Lanier,

I have oil consumption issues.  Ever since I've had the car.  400-500  
miles /quart.  Not sure if it's rings or not -- it could also be the  
crankcase ventilation with the higher lift performance cams and hence  
higher vacuum.  The heads were redone at the same time as the cams  
(about 35k ago).  I also know that the shortblock was replaced by  
Audi not too far before that due to excessive oil consumption.   
Anyhow, I figure it can't hurt.  I have no smoke at startup, just  
under acceleration.  Not leaking any oil - just blowing it out the  
exhaust ;-)

Ingo

On Apr 24, 2007, at 10:05 PM, Lanier Pratt wrote:

> Just following along with this and am curious what you're doing.
> Is this to simply clean out the top of the cylinder or other issues?
> Learning as I go.
>
> Lanier
> '92 V8Q
> '90 V8Q
>
> On Apr 24, 2007, at 6:05 PM, Ingo Rautenberg wrote:
>
>> So how's that Seafoam 'Fix' working out?  I just parked my V8 at a
>> big angle on the drive and poured 3 capfuls (brakeKleen cap) into
>> each cylinder on one bank and will let sit for??? 2 hrs, 4 hrs??...
>> and then do the other side (making sure to completely cover the
>> piston.  You can hear it doing it's work.  Sounds like alka selzer in
>> each of those cylinder bores :-)  All the plugs looked normal, btw.
>>
>> Ingo
>>
>> On Apr 16, 2007, at 8:44 AM, Jason Wilkerson wrote:
>>
>>> Got to work on the V8's MPG problem again.  Short replay - bad MPG
>>> leads
>>> to tests - find O2 code - find one cylinder 50-60psi low on
>>> compression.
>>> Update - Tested compression again - found low compression, did
>>> leakdown -
>>> seems to be leaking past piston and coming up out of the
>>> crankcase.  SO -
>>> this means that the valve train is tight and I'm looking for a  
>>> motor -
>>> well maby not.  On a whim I thought 'hey, I'll try some seafoam -
>>> what do
>>> I have to loose?'  I put the cylinder in question to TDC
>>> compression, turn
>>> it back a few degrees, pour seafoam in the spark plug hole, pull
>>> the crank
>>> back a few more degrees, then back to TDC.  Then I place air
>>> pressure on
>>> the cylinder - as to force the liquid down past the rings so it can
>>> soak,
>>> expecially at the top of the piston, where gravity is against you.
>>> I let
>>> it sit for 8hrs or so, turn it over without a spark plug, as to not
>>> create
>>> bent rods via hydrolock, replace everything and start it to let it
>>> burn
>>> all that seafoam out.  Run it till it quits smoking, pull plug,  
>>> check
>>> compression - 145psi!!! - thats a clean 55psi better than I have
>>> ever got!
>>>  I'm really exited, but I don't want to get my hopes up too much  
>>> - I'm
>>> still afraid that the seafoam was causing a 'false seal' that will
>>> fade
>>> with time - but I don't think so because I let it run plenty long
>>> enough
>>> to burn that off.  I will drive it tomarrow and post back my
>>> compression
>>> results.  I think if the O2 code disappears, and my MPG's are back
>>> up - I
>>> will know the truth faster!  One can hope.  Thanks for beiing my
>>> sounding
>>> board!
>>>
>>>                 Jason
>>>
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>>
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>> all contributions welcome!
>