<VV> Corvair tuning

[Dennis Pleau]

The '61 is a 145 CID engine. '64 engines are 164 CDI.  Off the top of my
head without doing some research and math, I'm guessing you didn't change
the compression ratio much by switching those heads.  What you need to do is
find the individual cylinder head volume for each head and see how they
match up.

dp 

-----Original Message-----
From: VirtualVairs [mailto:virtualvairs-bounces at corvair.org] On Behalf Of
djtcz--- via VirtualVairs
Sent: Sunday, November 08, 2015 6:58 AM
To: corvair
Subject: Re: <VV> Corvair tuning

Original message -
I recently rebuilt the engine in my '61 Rampside due to several dropped
valve seats. The engine is (as best I can tell) the original 80hp, 4 spd
that came in the truck. I installed new 30 over pistons and jugs, new
lifters, new head studs and remanufactured '64 110hp heads. I did not split
the block so it has the original camshaft installed. If I set the timing to
12 degrees BTDC it runs great but overheats after driving any distance and
will not restart. If I set it to factory recommendation 4 degrees BTDC then
as soon as I hit about 30mph it just lays down and has no power, but will
restart no matter how long it runs. I'm guessing the advance curve needs to
be adjusted but I'm not sure what I should do. Any suggestions? 

Thanks, 

Scott Ford
======================= 


Do you have a timing light? 
First, with vacuum advance disconnected and plugged on the engine side I'd
be checking for a smooth advance increase when the engine is revved up. 

Dan T