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Tech: At wits end with an overheating motor, long post
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<blockquote data-quote="customcj7" data-source="post: 660136" data-attributes="member: 3103"><p>Okay, progress, small, but progress. Looks like GRCthird was onto something. So I found TDC on my setup and it's still TDC on my harmonic balancer, so I was dialed in correctly.</p><p></p><p>No play in the timing chain, nice and tight and moved at the slightest turn of the crank. So I had my timing at 10 BTDC. Well I pushed it out to 20 degrees BTDC and it ran like that for quite some time maxing out at 180 degrees. Only when I started backing it down closer to 10 degrees BTDC did it start to creep up. I was running into some stumbles and rough running which in my opinion is just the carb being way out of whack. I've tweaked and turned the damn thing so much there is no telling what I've got it set at. But the motor ran well. </p><p></p><p>When I was tweaking the carb I had the air cleaner off and could notice the difference on the sound from the bowls when I backed it back down to 10 degrees BTDC. It was much louder noise coming from the carb, honestly like exhaust noise. I'd adjust the timing back up to 20 degrees BTDC and the sound went away. I'd rev the motor and I got no pings or knocks. If I gassed it, it would jump right up no issue, if I slow rolled it up it stumbled and hesitated, which again, leads me to carb.</p><p></p><p>But it ran much cooler initially. So based on the stuff today, it sounds like first i need to get my carb better dialed in just for smooth consistency, and then I'm going to have to play with my timing to get the best run without pre-ignition and see how that holds up on the street. </p><p></p><p>Making major progress to not have it hit 200 today just idling. Plus my IR Thermometer was getting much cooler readings across the engine, and the exhaust manifolds. So it sounds like I was WAY retarded on my timing. By about 10-15 degrees depending on how it finally shapes out.</p></blockquote><p></p>
[QUOTE="customcj7, post: 660136, member: 3103"] Okay, progress, small, but progress. Looks like GRCthird was onto something. So I found TDC on my setup and it's still TDC on my harmonic balancer, so I was dialed in correctly. No play in the timing chain, nice and tight and moved at the slightest turn of the crank. So I had my timing at 10 BTDC. Well I pushed it out to 20 degrees BTDC and it ran like that for quite some time maxing out at 180 degrees. Only when I started backing it down closer to 10 degrees BTDC did it start to creep up. I was running into some stumbles and rough running which in my opinion is just the carb being way out of whack. I've tweaked and turned the damn thing so much there is no telling what I've got it set at. But the motor ran well. When I was tweaking the carb I had the air cleaner off and could notice the difference on the sound from the bowls when I backed it back down to 10 degrees BTDC. It was much louder noise coming from the carb, honestly like exhaust noise. I'd adjust the timing back up to 20 degrees BTDC and the sound went away. I'd rev the motor and I got no pings or knocks. If I gassed it, it would jump right up no issue, if I slow rolled it up it stumbled and hesitated, which again, leads me to carb. But it ran much cooler initially. So based on the stuff today, it sounds like first i need to get my carb better dialed in just for smooth consistency, and then I'm going to have to play with my timing to get the best run without pre-ignition and see how that holds up on the street. Making major progress to not have it hit 200 today just idling. Plus my IR Thermometer was getting much cooler readings across the engine, and the exhaust manifolds. So it sounds like I was WAY retarded on my timing. By about 10-15 degrees depending on how it finally shapes out. [/QUOTE]
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