Overheating / Timing advance
09-25-2003, 09:06 AM
#1
Member
Thread Starter
Join Date: Nov 2001
Location: Billerica, MA
Posts: 208
Likes: 0
Received 0 Likes
on
0 Posts
Car: 85 T/A
Engine: 350 TPI
Transmission: T5
Overheating / Timing advance
If the timing is advanced could or will the motor over heat?
How far advanced does the timing need to be to cause overheating? This is for a non-computer/carb motor.
Thanks for any reply.
How far advanced does the timing need to be to cause overheating? This is for a non-computer/carb motor.
Thanks for any reply.
09-25-2003, 09:30 AM
#2
Supreme Member
Join Date: Jul 1999
Location: Loveland, OH, US
Posts: 18,457
Likes: 0
Received 15 Likes
on
15 Posts
Car: 4
Engine: 6
Transmission: 5
The opposite.
If the advance is anywhere near right (i.e. set for max power and doesn't cause pinging), the engine will run cooler than it will with it retarded; more of the fuel energy released as heat by burning, will be converted into mechanical energy. The farther retarded the timing is below that optimum point, the hotter the engine will run. The reason for advance is to make the combustion process release its energy at the exact point in the engine's cycle that extracts the most power, which is to say, the point of least loss and greatest thermal efficiency.
If the advance is anywhere near right (i.e. set for max power and doesn't cause pinging), the engine will run cooler than it will with it retarded; more of the fuel energy released as heat by burning, will be converted into mechanical energy. The farther retarded the timing is below that optimum point, the hotter the engine will run. The reason for advance is to make the combustion process release its energy at the exact point in the engine's cycle that extracts the most power, which is to say, the point of least loss and greatest thermal efficiency.
09-25-2003, 10:25 AM
#3
Supreme Member
Join Date: Nov 1999
Location: NE
Posts: 2,860
Likes: 0
Received 2 Likes
on
2 Posts
Car: 82 camaro SC
Engine: 350
Transmission: 700r4
If it's advanced enough that it's pinging, that will add heat to the engine. To overheat, well that depends on the cooling system. If the cooling system is really good, it will take care of the extra heat from bad timing (advanced/retarded too far). Just set the timing right and don't worry about it.
09-25-2003, 12:19 PM
#4
As long as we all have our "thinking caps" on, anyone want to guess why a lean mixture will make a liquid cooled engine run hotter, but an air cooled engine run cooler?
Yes, it's relevant, and may help you understand why retard/lean creates more heat in your car.
Yes, it's relevant, and may help you understand why retard/lean creates more heat in your car.
09-25-2003, 12:34 PM
#5
Supreme Member
Join Date: Jun 2001
Location: Charleston, SC
Posts: 9,550
Likes: 0
Received 2 Likes
on
2 Posts
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Originally posted by Vader
As long as we all have our "thinking caps" on, anyone want to guess why a lean mixture will make a liquid cooled engine run hotter, but an air cooled engine run cooler?
Yes, it's relevant, and may help you understand why retard/lean creates more heat in your car.
As long as we all have our "thinking caps" on, anyone want to guess why a lean mixture will make a liquid cooled engine run hotter, but an air cooled engine run cooler?
Yes, it's relevant, and may help you understand why retard/lean creates more heat in your car.
then again, the only air cooled motors i work with are alcohol/nitro fuel based RC cars that have oil mixed into the fuel... so that might make a diff....
09-25-2003, 12:56 PM
#6
Member
Join Date: Mar 2003
Location: Houston
Posts: 170
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88camaro
Engine: 355
Transmission: th350
Originally posted by MrDude_1
then again, the only air cooled motors i work with are alcohol/nitro fuel based RC cars that have oil mixed into the fuel... so that might make a diff....
then again, the only air cooled motors i work with are alcohol/nitro fuel based RC cars that have oil mixed into the fuel... so that might make a diff....
09-25-2003, 01:18 PM
#7
Supreme Member
Join Date: Jun 2001
Location: Charleston, SC
Posts: 9,550
Likes: 0
Received 2 Likes
on
2 Posts
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Originally posted by 88Spinner
My old dirtbike!
My old dirtbike!
athough i doubt your dirtbike ran nitro
Trending Topics
09-25-2003, 11:28 PM
#10
Supreme Member
Join Date: Jun 2001
Location: Charleston, SC
Posts: 9,550
Likes: 0
Received 2 Likes
on
2 Posts
Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
Originally posted by Vader
I'm not sure about a two-stroke, but four-stroke aircooled (like old VWs. Lycomings, etc.) tend to run hot when rich.
I'm not sure about a two-stroke, but four-stroke aircooled (like old VWs. Lycomings, etc.) tend to run hot when rich.
care to explain why? is it because the head design makes it so the rich exhaust burns in the head or somthing like that?
Thread
Thread Starter
Forum
Replies
Last Post
