[DeTomaso] Overheating problem

Mon Jul 15 17:47:10 EDT 2024

I missed the SVO part, so my recommendations are for stock Cast Iron heads. Aluminum heads might be a little less if I could check the engine we have on my Dyno for better specs but the aluminum heads also differ between makes but I would ask Dan Jones specifically about different head types
Larry

On 7/15/24, 1:33 PM, "Mike Drew" <mikeldrew at aol.com <mailto:mikeldrew at aol.com>> wrote:

Larry,

SVO heads are far more efficient and probably need no more than 28-32 degrees total advance (not including vacuum advance). 

At least that’s what I’ve been told by people who actually know this stuff. I don’t pretend to myself, I just remember what I’ve been taught. 

And admit I could be wrong…but I don’t think I am!

Mike

Sent from my iPhone

> On Jul 15, 2024, at 14:41, Larry Stock <larrys at panteraparts.com <mailto:larrys at panteraparts.com>> wrote:
> 
> 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> <mailto: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> <mailto: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.
> __________________________________________________________________
> 
> 
> From: John Neal <jrnealjr at aol.com <mailto:jrnealjr at aol.com> <mailto: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> <mailto:georgesekula at outlook.com <mailto:georgesekula at outlook.com>> <georgesekula at outlook.com <mailto:georgesekula at outlook.com> <mailto:georgesekula at outlook.com <mailto:georgesekula at outlook.com>>>;
> mikeldrew at aol.com <mailto:mikeldrew at aol.com> <mailto:mikeldrew at aol.com <mailto:mikeldrew at aol.com>> <mikeldrew at aol.com <mailto:mikeldrew at aol.com> <mailto:mikeldrew at aol.com <mailto:mikeldrew at aol.com>>>
> Cc: detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com> <mailto:detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com>> <detomaso at server.detomasolist.com <mailto:detomaso at server.detomasolist.com> <mailto: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> <mailto: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.
> __________________________________________________________________
> _______________________________________________
> 
> 
> 
> 
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
> DeTomaso mailing list
> DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com> <mailto:DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com>>
> http://server.detomasolist.com/mailman/listinfo/detomaso <http://server.detomasolist.com/mailman/listinfo/detomaso> <http://server.detomasolist.com/mailman/listinfo/detomaso> <http://server.detomasolist.com/mailman/listinfo/detomaso>>
> 
> 
> To manage your subscription (change email address, unsubscribe, etc.) use the links above.
> 
> 
> Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.
> 
> 
> _______________________________________________
> 
> 
> Detomaso Email List is not managed by POCA
> Posted emails must not exceed 1.5 Megabytes
> DeTomaso mailing list
> DeTomaso at server.detomasolist.com <mailto:DeTomaso at server.detomasolist.com>
> http://server.detomasolist.com/mailman/listinfo/detomaso <http://server.detomasolist.com/mailman/listinfo/detomaso>
> 
> To manage your subscription (change email address, unsubscribe, etc.) use the links above.
> 
> Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.