Hi John, I believe that the CR of my MkII engine is 8.7, which runs OK on 87
octane when timing is max at 30 degrees. It will knock audibly at 2500 rpm
under full throttle though. Distributor is #40384 which, though shown in the
Lucas listings, does not have any advance curves listed. It's not shown in the
MG literature, but was delivered with the car. I use 30 degrees because that
is what the later TDs used. 8.7 is assumed, not measured, because head was
dressed .010 when engine was rebuilt, and original CR was said to have been
8.5. I did not do volume measurements at time of rebuild. Is Regular
Unleaded the same brew across the country? Are there altitude
considerations?BobTDC 21934
---------- Original Message ----------
From: JohnD <johnsfolly@gmail.com>
To: MG T List <mg-t@autox.team.net>
Subject: [Mg-t] Compression ration
Date: Tue, 22 Feb 2011 15:40:44 -0500
Good afternoon.
Just got off the phone with the machine shop doing the work on my XPAG to
increase the likelihood I make it across the country next June. I need
advice on static CR for a street-going TD with Mark 2 valves, some
porting, 1 1/2 carbs, and 4.3 rear end. I'd like to run pump gas...regular
unleaded would be nice. Probably E+something pretty soonas we are already at
E 85 in Michigan.
Suggestions? Thanks.
John Deikis
Rallye for CURE <http://www.tinyurl.com/kidsCURE>
--
www.johnsfolly.webs.com
*Racing in the Past Lane!*
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