[DeTomaso] Overheating problem

[Larry Stock]

You should have 36 degrees overall at over 3000 RPM, you should have 20 degrees centrifugal advance, 16 degrees initial, with an additional 10 degrees Vacuum advance at cruise. The MSD units need a tach amplifier adaptor for more accurate tach readings.
Larry Stock

On 7/15/24, 11:38 AM, "DeTomaso on behalf of George Sekula" <detomaso-bounces at server.detomasolist.com <mailto:detomaso-bounces at server.detomasolist.com> on behalf of georgesekula at outlook.com <mailto:georgesekula at outlook.com>> wrote:


I was worried about the timing curve. I replaced the entire ignition
system over last winter. I installed the new MSD Ultra 6AL Plus and
pinned the weights in the crab cap distributor. I knew I would never
change springs and weights and I am spoiled by how easy it is to tune
my kid's Hondas. I tried to match the old distributor setup to start.
But I am not sure how close I am to having the correct timing curve for
a Cleveland with SVO heads. I have 14 at idle, 19 at 2000 rpm, and 22
at 2400 rpm (these are the rpm's at highway speed), and very little
vacuum advance. I am not happy about having to remove the head, but at
least I now understand the problem.
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From: John Neal <jrnealjr at aol.com <mailto:jrnealjr at aol.com>>
Sent: Monday, July 15, 2024 1:47 PM
To: georgesekula at outlook.com <mailto:georgesekula at outlook.com> <georgesekula at outlook.com <mailto:georgesekula at outlook.com>>;
mikeldrew at aol.com <mailto:mikeldrew at aol.com> <mikeldrew at aol.com <mailto:mikeldrew at aol.com>>
Cc: detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com> <detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com>>
Subject: Re: [DeTomaso] Overheating problem


Retarded Timing can cause overheating and dieseling when the engine is
turned off.






I adjusted mine so the engine is hard to turn over when hot and then
backed the timing off until the engine cranks freely when hot.






Way less work then pulling the seats and bulkhead to connect a timing
light.


In a message dated 7/15/2024 11:57:44 AM Central Standard Time,
georgesekula at outlook.com <mailto:georgesekula at outlook.com> writes:






Thank you all for your help. Dozens of attempts, three times I could
idle for 30 minutes without an excursion, then 10 minutes on the
highway and the temperature climbs. Drained oil and found no
contamination. No smoke out the tailpipe. No little air bubble,
just
volcano like eruptions. Did a combustion-gas-in-coolant test four
times with no combustion gas detected. When I did a cylinder leak
down
test on cylinder 3, pointer was in the red and coolant was
overflowing
the pressure tank. I have some work to do, hoping it is just the
head
gasket.
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