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Author Topic:   Hey Snowman?
Dirt Freak

Total posts: 273
posted January 24, 2002 05:28 PM
First off, let me say how much I appreciate you and Awkward Jeff taking the time to post on this forum. I check thru it almost every day and am nearly to the point of correcting the geometry on the front end of my metric. I'll be using the A. J.'s input for that. My question for you is this:
Last season one of the guys I race with had an overheating problem. He tried dang near everything before he got it solved. He told me that ha had left some foam in his fuel cell so long that it had begun to deteriorate and caused the fuel filter to clog. His theory is thst the clogged filter was restricting the fuel flow to the carb and was subsequently "leaning out" the motor.
I'm not the brightest candle on the cake when it comes to carbs-----but I just don't believe this was happening! Wouldn't the low supply of fuel cause the float bowls to empty out and cause the engine to misfire before it caused the fuel/air mixture to imbalance? He swears this was the problem and I'll never convince him otherwise, but I'd like to know. Would you mind posting a reply? Thanks!

Dirt Maniac

Total posts: 140
posted January 24, 2002 09:24 PM
Eljojo, Thank you for your kind words.I enjoy helping people,I like this forum.It's nice to find a place with so many people willing to help others. I too enjoy the intelligent and well thought out,always helpful posts made by AwkwardJeff. It takes a lot of time and hard work to figure out all the bumpsteer/front end geometry. Alot of guys,even if they had the abillity,tools and time,wouldn't be willing to share the information with others. So, I think that's pretty big of A.J.,and says alot about his character...... As far as your question,bear in mind I'm no carb expert,I'm going to have to go with your friend.(sorry about that) I understand your doubts about your friends explanation,but perhaps you're only thinking about the carb as it sits still. If you think about what is happening to your fuel level as the car accelerates,brakes hard,then turns left, it becomes easy to see how your jets and power valve can be uncovered if there is not enough fuel in the bowl. Granted,they may not be uncovered for long,but it doesn't take long for the damage to be done. Consider this, your engine fires every 90 degrees of crank rotation.Consider your crank speed,it doesn't take long to fire a lot of cylinders (and you sure don't want to be firing them too lean). In general, anything that restricts fuel flow,including improper float adjustment,will cause you to run lean. In your friends case, if he was lean enough to run hot for so long,then he is lucky his engine didn't blow....... The foam wasn't just pluging his filter. It had to be at times pluging or partialy blocking jets,power valve,idle circuts,etc., which would of course cause further leaning and overheating. When you open the throttle,the air is going to come,You gotta have fuel to mix with it..........Hope this helps,if at any time I can help you,please don't hesitate to ask,always glad to help

Dirt Freak

Total posts: 273
posted January 26, 2002 04:53 PM
Thanks! Guess I was wrong. BTY He not only blew the engine----he blew the replacement....and the one after that-----all from overheating!

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