Oil squirters. Required, or dead weight?

[jdbubb@ix.netcom.com (Dan Bubb)]

Josh:
As Larry pointed out the purpose of the oil squirters is to cool the
pistons, NOT lubrication.
A cooler piston allows higher compression without detonation.
So, depending on what compression ratio you're running or if you're running
with a turbo or supercharger the oil squirters could be a big help.
If you're running stock compression with no boost and can always get good
gas then they may not be necessary.
Also, note that the need to suppress detonation is greatest around the
torque peak (where cylinder pressures are highest), not at super high RPM,
so it's a CR related issue, not RPM related.
Recent article in RaceTech magazine about the Audi R8 engine mentions that
they improved the water circulation in the cylinder head and as a result the
combustion chamber ran cooler and they were able to delete one of the oil
squirters under each piston.
Just a little info so you all know it's not just opinion.
Dan


----- Original Message -----
From: <joshhignight@techography.net>
To: Scirocco List <scirocco-l@scirocco.org>
Sent: Saturday, July 20, 2002 9:49 PM
Subject: Oil squirters. Required, or dead weight?


   I am in the middle of a dilemna. My beasty block has been cursed with
problem after problem. First, I find the pistons are facing the wrong
direction (it's a 16v, relief cuts for intake valves were installed facing
the exhuast valves). Open bottom end, rods are on backwards too (bumps on
rods are not facing cambelt side of block, going against Bentley note). Pull
rod caps, crank, rotate pistons and rods, reassemble. Turn crank... thunk
(contact). Searching reveals that the oil squirts are contacting the now
correctly installed rods.

So, do I pull the oil squirters and just live with it? Do I go through the
hassle of not having my car for how many more weeks to have things corrected
(the shop is not local, by 900 miles)? If the block will have no adverse
effects from not having the squirters installed, I'll run it like that. I
plan to hit 8K rpm with it and it's running 83mm forged pistons and 2L crank
and rods (was a stock 1.8 16v block).

Any and all input are welcome.

Joshua


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