[xk-engine] 8:1 or 9:1

What few horsepower you will lose by lowering the compression
won’t be noticable given that todays gas is lower in octane…
With the lower compression you can advance the timing slightly to
compensate for the “slower” burn of the fuel… “Factory” specs for an 8-1
engine should do you nicely.
Charles #677556-----Original Message-----
From: DON DEAN ddean@ket.org
To: saloons@jag-lovers.org saloons@jag-lovers.org;
xk-engine@jag-lovers.org xk-engine@jag-lovers.org
Date: Thursday, October 05, 2000 10:37 AM
Subject: [xk-engine] 8:1 or 9:1

One intriguing suggestion was to

replace the 9:1 pistons with 8:1 to better accomodate lower octane gas and
promote lower engine temperature. Would this result in substantial power
loss? I’m not concerned with top end speed (I rarely exceed 80 mph) but I
do enjoy a lively acceleration. Would 8:1 compression in a MK 10 engine
designed for 9:1 be sluggish? Thanks again to all. The list is a great
source of knowledge and comfort for a neophyte.

Don Dean
'63 MK 10