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PostPosted: Sat Jul 30, 2005 9:21 am 
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Location: Texas
had a timing belt fail while out driving, the engine stopped running but i got it to start back up again. turns out the belt didnt break it just started to. basically it lost half of about 15-18 teeth and developed a 2 inch long hole. after it started up again it ran fine with minor ticking at higher rpm. got it home and took it apart and found the cam sprocket was about 8 teeth advanced. fixed the belt and now theres a very loud ticking noise at idle, i cant really pinpoint where its coming from nor can i feel a corespoding vibration.

my guess is some valves are bent but the engine still has decent compression. what do you guys think?

on the plus side the timing belt was replaced under warranty, only had like 50 miles on it :roll:


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PostPosted: Sat Jul 30, 2005 8:44 pm 
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my guess is some valves are bent but the engine still has decent compression. what do you guys think?

Its not likely that you bent any valves. The motor is a non-interference motor, and there is a ton of clearance. It sounds like it could be a noisey lifter, but I'm not sure why it would start acting up after the belt went on you.

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PostPosted: Sat Jul 30, 2005 9:16 pm 
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A quick FYI for all, someone that knows for a FACT, please post.

At MAX valve lift (valve is MAX into pistion area), will the valves contact the piston at TDC? With a cam "at rest", are any of the valves sticking far into the cylinders?

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PostPosted: Sat Jul 30, 2005 9:27 pm 
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Quote:
will the valves contact the piston at TDC?


Quote:
The motor is a non-interference motor


i think that means no, for stock engines. i am running a higher lift cam but were talking fractions of an inch increase over stock, however i am not an engine builder so mike would have to chime back in to say if that would cause interference.

how do i tell if one of the lifters has taken a dump? and just for fun, if one of the valves met one of the pistons would i be able to tell with just taking the valve cover off?


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PostPosted: Sat Jul 30, 2005 10:10 pm 
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Nowhere wrote:
A quick FYI for all, someone that knows for a FACT, please post.

At MAX valve lift (valve is MAX into pistion area), will the valves contact the piston at TDC? With a cam "at rest", are any of the valves sticking far into the cylinders?


I think I already answered that question, or you don't think I know, for a FACT.
Is your name Jomo?
I have had the same thing happen with more lift (.375"), the head machined .040., and at 7000RPM. No problems. You can't tell by looking under the valve cover, but a compression test will tell you. You will have low, or no compression in the cyl. with a bent valve.

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PostPosted: Sun Jul 31, 2005 12:01 am 
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ran compression test, took the valve cover off, played with all of the lifters, saw nothing obviously wrong, put it back together, noise is gone....

i think im going to have to comit myself. i probably didnt tighten something down well enough the last time in. who the hell knows :?: :?


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PostPosted: Sun Jul 31, 2005 5:10 pm 
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Location: Altamonte Springs, FL
suprf1y wrote:
Nowhere wrote:
A quick FYI for all, someone that knows for a FACT, please post.

At MAX valve lift (valve is MAX into pistion area), will the valves contact the piston at TDC? With a cam "at rest", are any of the valves sticking far into the cylinders?


I think I already answered that question, or you don't think I know, for a FACT.
Is your name Jomo?
I have had the same thing happen with more lift (.375"), the head machined .040., and at 7000RPM. No problems. You can't tell by looking under the valve cover, but a compression test will tell you. You will have low, or no compression in the cyl. with a bent valve.


Does the "interferance" reference mean NO POSSIBLE valve to piston contact, ever? By definition, would a either an intake or an exhaust valve at MAX protrusion make contact with a NON interferance engine (that's what the valve cutouts/reliefs are for correct)?

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PostPosted: Sun Jul 31, 2005 5:58 pm 
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an interferance engine is an engine where if the valve stays at maximum lift long enough the piston will eventually come up and hit it. obviously this requires the cam to stop moving or the timing belt to jump quite a number of teeth or something else to go horribly wrong.

and then a non-interferance engine is just what it sounds like, one where even if the cam stops moving the piston doesnt come far enough up the cylinder to touch the valves. basically the valves cant interfere with the pistons and visa versa.


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PostPosted: Sun Jul 31, 2005 7:14 pm 
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agental wrote:
an interferance engine is an engine where if the valve stays at maximum lift long enough the piston will eventually come up and hit it. obviously this requires the cam to stop moving or the timing belt to jump quite a number of teeth or something else to go horribly wrong.

and then a non-interferance engine is just what it sounds like, one where even if the cam stops moving the piston doesnt come far enough up the cylinder to touch the valves. basically the valves cant interfere with the pistons and visa versa.


Thanks for clarifying that for me

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