[Fot] Help! Ambro engine crankcase internal pressures. ????

[Joe Alexander]

Mike,

I changed the head to lower the compression to use pump gas as i drive the
Ambro on the street.

I am now wondering if this isnt where the problem started.

I drove the Ambro to Minneapolis 200+ miles, following 'uncle jack', the Stag
and Johnmac at Freeway speeds. It had the old head and it didnt leak any oil.

My time working on this car is far apart in time so I tend to lose
continuity.

What can there be about this head that would do this? i am not losing coolant,
btw.

Thanks Mike and all.







Joe Alexander
A. R. E.
645 1st Street
Jesup, Iowa 50648
319.464.4711  (cell)
n197tr4 at cs.com





-----Original Message-----
From: Mike Munson <fasttrs at yahoo.com>
To: tr4racing <tr4racing at googlemail.com>
Cc: Joe Alexander <n197tr4 at cs.com>; fot-bounces <fot-bounces at autox.team.net>;
fot <fot at autox.team.net>
Sent: Sat, May 12, 2012 7:48 pm
Subject: Re: [Fot] Help! Ambro engine crankcase internal pressures. ????


Joe, I have had head gaskets that leaked and pressurized both the crankcase
and
the coolant passages. However, the most common reasons for over pressurized
crankcases that i have experienced are improperly seated, broken or worn rings
and holes in pistons.

Mike

Sent from my iPhone

On May 12, 2012, at 4:45 PM, tr4racing at googlemail.com wrote:

> Hi Joe,
>
> Piston rings would be my first guess. If the head gasket would leaking it
would force out water before oil starts leaking.
> A wild idea is that your exhaust valve guide is too wide and exhaust gas is
getting forced to the valve area.
>
> Cheers
> Chris
> Gesendet mit BlackBerry von Vodafone
>
> -----Original Message-----
> From: Joe Alexander <n197tr4 at cs.com>
> Sender: fot-bounces at autox.team.netDate: Sat, 12 May 2012 12:31:45
> To: <fot at autox.team.net>
> Subject: [Fot] Help!  Ambro engine crankcase internal pressures.    ????
>
> I need to develop a list of possible causes of internal pressures.
>
> It's been going on for a long time, but the Ambro get's attention last.
>
> This list is alive and well and I need help..................TIA
>
> After about 3,000 RPM or so, the pressure builds and pushes oil out
regardless
> of methods of venting. What are the possibilities?
>
> I really hate to pull the engine without an idea of the cause.
>
> Is there any possibility of a crack in the head that pushes air into the
> crankcase?
>
> A list of possibilities would be very useful to me.   Finding the problem
> before pulling engine would make me very happy.....begging.
>
>
>
> Joe Alexander
> A. R. E.
> 645 1st Street
> Jesup, Iowa 50648
> 319.464.4711  (cell)
> n197tr4 at cs.com
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