You are correct if there are casting flaws causing a restriction to the oil
flow in the block.B The real problem is in the crankshaft and oil hole size
out to the rods.
Ron K
ReK Racing
----- Original Message -----
From: "Tony Drews " <tony@ tonydrews .com>
To: "Greg & Alison Blake" <ablake2@ austin . rr .com>, fot @ autox .team.net
Sent: Monday, May 18, 2009 10:54:09 AM GMT -05:00 US/Canada Eastern
Subject: Re: [ Fot ] Drilling oil passages from main gallery to mains
One of the uncle jack tricks was to slightly drill out the center
main oil passage. B Don't have a diameter, though. B Since it feeds two
rods instead of one it seemed like the thing to do. B This is
mentioned in item four of the "Block" section of the engine building tips
here:
http :// www . tonydrews .com/ uncle_jacks_engine_building_tips . htm
- Tony
At 10:52 PM 5/14/2009, Greg & Alison Blake wrote:
>In a TR3/4 block, is there an advantage to drill out the oil passages
>from the oil gallery to the mains? B If so, what size is optimal?
>Neglecting (a lot of things) oil surges and viscosity break down etc.,
>is the oil pressure in the system constant for a given RPM? B If pressure
>in the system is constant, when I open up these supply holes more oil
>would flow to the main and follow on to the rods due to a greater cross
>sectional area for the same pressure and oil supply to the valve gear
>would be unaffected because the pressure in the oil gallery is constant
>and I have not changed the cross sectional area for the passage to the
>valve gear.
>
>Do I have this correct, or am I all oily?
>
>Thanks,
>
>Greg
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