<VV> 140/4 maximum safe RPM?

[Western Canada CORSA]

I'll let the more experienced agree/disagree with my assessment of this.....

With my stock 140 (.60 over on the rebuild) I start to feel the valves float
around 5500 rpm, after that there isn't much point in building the revs.  If
that 280 cam has steeper ramps, and stock valve springs, you'll probably
feel about the same with your engine.  I like to think of it as a built in
rev limiter.

Regards,
Joel

-----Original Message-----
From: virtualvairs-bounces at corvair.org
[mailto:virtualvairs-bounces at corvair.org] On Behalf Of Ray Rodriguez
Sent: Wednesday, May 23, 2007 1:20 PM
To: virtualvairs at corvair.org
Subject: <VV> 140/4 maximum safe RPM?


Greetings all,

     As many of you know I am reassembling my 140 and hoping to have it back
in the car in a few weeks.  The recent posts about exploding flywheels and a
discussion I had with the machinist who is doing my heads has me wondering
about maximum safe RPM for a Corvair.  

     My engine has a  7 year old but very VERY low mile performance rebuild.
This engine has a 280 Isky cam, and is currently getting the heads ported
and valve seats done.  The machinist said this engine (with this cam which
was installed by the PO) will want to rev to about 7200 which worries me.
I'm 27 years old, and while I won't be racing the car or constantly abusing
it you can rest assured I will drive it harder then I should more often then
I should.  I don't know what kind of measures were taken to balance the
engine when it was built since I never spoke to the PO (I bought the car
from a liquidator) but I know the engine was built for autocross and
included a 280 cam and forged .60 over pistons (I think the rods are cast)
so I hope it is fairly well put together.  

     I have no desire to do any more work on this engine, so I will not be
balancing it myself..... (I know a bunch of you want to tell me to balance
it!)

What would you rev this engine to... assuming you were a few years younger
(ggg) and looking for performance!!!  At what RPM does the risk really come
into play?


Ray Rodriguez
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