Honda Knocking Noise While Cruising

HONDA
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00HONDACIVIC
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  • 16 POSTS
I took my car to the track yesterday and ran the car bout three times. I was having problems launching the car all day. On the third run I missed second and kinda grinded it a little. after the run i noticed a knocking noise coming from what sounded like the cylinder head right above first piston closes to the distributor. when the car idles it does not make the noise. when i push the gas n a good amount while driving in a high gear it doesnt really make the the noise, but when i am maintaing a constant speed it makes the knocking. There are no leaks and never sound as if some blew car finished run fine. The head is stock b16 besides ctr cam shafts. the bottom end is built with eagle rods, je pistons 11:1 copression, and a eagle block guard. with like a ls girdle or something for protection on high reving. the motor has about 35,000 miles. What seems to be the problem?
Apr 23, 2006 at 9:04 PM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Pull the valve cover, it sounds like you might have an cracked cam tower or a piston shirt. A rod would knock loudest on feathered acceleration under load. The cam tensioner and water pump aren't far from that area. Don't pop a cam belt of you won't be missing gears for a long time. Good luck
Apr 24, 2006 at 1:00 PM

Suggested Repair

Pull the valve cover and inspect for a cracked cam tower or damaged piston skirt. Also check the nearby cam-belt tensioner and water pump. A rod knock would typically be loudest under light acceleration and load. Do not allow the timing belt to jump or come off.

Conversation Summary

A Honda owner with a built B16 engine noticed a knock near the cylinder head above the first piston after track runs and a missed shift. The noise is absent at idle and under hard acceleration in a high gear, but present while maintaining a constant speed; there are no leaks. The expert advised pulling the valve cover to check for a cracked cam tower or piston skirt and also considering the cam tensioner and water pump, noting that a rod knock is usually loudest under light load. They also warned not to let the cam belt come off.

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