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SOUNDS LIKE VALVES HITTING

This is a discussion on SOUNDS LIKE VALVES HITTING within the Grizzly Talk forums, part of the Grizzly Forums category; Hello, new to sight and appreciate any help. Just put a hot rod crank, Wiseco 11:1 piston with a stage 1 hot cam. I've aligned ...


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#1
12-25-2011, 11:19 AM
SOUNDS LIKE VALVES HITTING

Hello, new to sight and appreciate any help.

Just put a hot rod crank, Wiseco 11:1 piston with a stage 1 hot cam. I've aligned crank to TDC with the 3 cam gear marks level with the head and the third straight up 90 degrees.

I rotated the crank several rovolutions CCW to tighten the chain on the exhaust side.

Then released the tensioner and rotated clockwise several revolutions.

Acts like the auto compression pin isn't engaging or out of time.

It will start but it sounds like piston hitting valves.

Have had head apart several times to ensure timing alignment of cam marks haven't changed.

Need help

Last edited by DOUGJERRAM; 12-25-2011 at 11:52 AM.. Reason: intro to site
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#2
12-25-2011, 02:56 PM
What motor? 660? 700?
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#3
12-25-2011, 06:20 PM
cause it can be a bit tricky, have to ask, crank to balancer marks aligned as well?

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#4
12-26-2011, 11:15 AM
Yes, the timing marks were aligned according to the manual?
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#5
12-26-2011, 11:19 AM
Sorry, its an 06 660
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#6
12-26-2011, 11:34 AM
Update, using a dial indicator on the intake valve side, with the cam fully depressed, the intake valves can be compressed .075 more until the valve hits the piston.
Aggravated, I took the head off to look for impact marks.

It looks like the center intake valve left a scuff or inprint, not a dent on the piston, even though it had .075 piston clearance.

Couldn't get the dial indicator on the exhaustside, but the valves could be depressed further until it hit the piston. Guessing at least .050.

Going to buy some clay and place it on the recessed piston reliefs and re-assemble.

Maybe that will show something.
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#7
12-26-2011, 03:10 PM
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Originally Posted by DOUGJERRAM View Post
Hello, new to sight and appreciate any help.

Just put a hot rod crank, ...
Hey, welcome.

You lost me right there, way over my head. Hope you figure it out.
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#8
12-26-2011, 04:10 PM
is it a stroker crank? i have no first hand exprieance with the 660 but i have been told that the middle valve spring has to be replaced with a raptor valve spring on the 600 for a cam. im sure there are plenty of people on here with lots of 660 knowledge that will get you fixed up.
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#9
12-26-2011, 05:48 PM
Question

Thanks, you say tricky, other than aligning the timing marks and the woodrift key not wanting to cooperate and stay, is there something else I'm missing
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#10
12-26-2011, 05:58 PM
Cool

Thanks, the Hot Rod crank is stock, no stroker, didn't want any problems LOL. I just removed the valves thinking one of the three was different in lengths and I mixed them up, not.
It appears the Wiseco has a less recessed area in the middle valve compared to the outside valves.
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#11
12-26-2011, 07:46 PM
i recently did the stroker and wiesco 11:1 cp and a mud buster cam i had no problems you do have to change the center intak spring to an 05 raptor spring if you are hitting you set some thing up wrong i would think when you set tdc did you have it on the compresion stroke and make sure you didnt mix up your valves exuast and the intake look the same but are alot diffrent from one another
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#12
12-26-2011, 09:32 PM
Rotate the engine counter clockwise to top dead center and make sure the 2 holes in the cam shaft are pointing straight up. If that's not a problem check the decompression pin to make sure it moves in and out when the weights are activated, if installed wrong it could be stuck open and cause valve problems.
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#13
12-27-2011, 12:51 PM
Yes, it's at TDC using the middle mark of the three. You are right about the valves appearing the same. I did remove the 3 intake valves and measured the overall height, and they were the same. Are the exhaust valves longer than the intake?
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#14
12-27-2011, 01:07 PM
Thanks Bulldog for the information. All of the lobes are down, the oiling holes are up. The manual persist that the three indents on the cam gear is what a should focus on.

The compression release pin does move up and retracts back with the weights.

The Hot Cam Company claims that they cannot ensure that some of their cams may not work with the pin. I guess some type of disclosure crap.
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#15
12-27-2011, 01:41 PM
Talking

I laid a piston sized clay disc about .200 thick on top of the piston and reassembled.

Starting at TDC, I rotated the engine 4 revolution in the CCW direction, that's to keep the back side of the chain tight.

Removed the head and found some interesting results.

There wasn't any piston clearance marks. none.

There wasn't any exhaust valve marks at all, none.

The only mark was the center intake valve, the thickness of the clay left between the valve and the head was .080, almost identical to my dial indicator measurement.

And I thought it was the center valve that left a mark on the piston.

eclipsemsj might be onto something with the Raptor spring.

It almost makes sense that with a weak valve spring, that the Hot Cam is hitting my center intake with enough force to over extend the strength of the spring, thus hitting the piston. Almost sounds feasible.
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