New cam install w/MPI

[coldair]

On a side note comp cam told me I would have coil bind with stock springs I just checked a stock spring they DO NOT have coils bind mine had .070 ish I really didn't check that accurately. (just threw a set of calipers up there to see)

 

[Sasquach]

On a side note comp cam told me I would have coil bind with stock springs I just checked a stock spring they DO NOT have coils bind mine had .070 ish I really didn't check that accurately. (just threw a set of calipers up there to see)

I did a similar check with mine and found the limiting factor to be valve travel with regards to the keeper and guide seal, .550+- and things run out of room.

 

[tarry99]

On a side note comp cam told me I would have coil bind with stock springs I just checked a stock spring they DO NOT have coils bind mine had .070 ish I really didn't check that accurately. (just threw a set of calipers up there to see)

I did a similar check with mine and found the limiting factor to be valve travel with regards to the keeper and guide seal, .550+- and things run out of room.

If you think your that close I am hoping that your checking with the right equipment? (pictures) .060 - .070 is close.
That close to coil bind in a racing application is acceptable because we look at these parts as consumables sometimes changing a few valve springs every pass.
In a street application compressing the spring to near coil bind in every cycle will lead to worn out springs sooner than later.

 

[coldair]

Tarry if you read beginning of the 7th page on the comp cam directions it says .060 minimum http://www.compcams.com/technical/instructions/files/145.pdf

 

[tarry99]

Tarry if you read beginning of the 7th page on the comp cam directions it says .060 minimum http://www.compcams.com/technical/instructions/files/145.pdf

Coldair:
It says that "A minimum of .060" between the coils needs to be maintained" Which is fine..........but how have you checked that?

As I mentioned before running this stuff that close can be hard on your parts and cause premature part failures.

Have you also done any of the other mentioned procedures for checking other clearances?

Not knowing any of the components you are using nor the clearances my only point here is to make sure you do check and understand what you have before you run it.............

 

[tarry99]

If you think your that close I am hoping that your checking with the right equipment? (pictures) .060 - .070 is close.
That close to coil bind in a racing application is acceptable because we look at these parts as consumables sometimes changing a few valve springs every pass.
In a street application compressing the spring to near coil bind in every cycle will lead to worn out springs sooner than later.

Coldair, So to recap , I did check your Cam & Spring selections On-line and although on paper it looks fine, ................ I would still suggest that when checking installed spring height you have a proper spring mic and likewise in order to check coil bind or a relative spring pressure at a given height based on your cam lift and rocker ratio a calibrated Valve spring checker as shown be used.

Perhaps you have access to these tools at a local shop?

Once you have confidence in your measurements on the bench then you should take a pair of test springs (low tension)and install one in your Intake & Exhaust valves on say #1 cylinder , put your lifters and push rods in and attache a large Degree wheel to the crankshaft and with a dial indicator mounted on your block establish (TDC) top dead center Piston height at your timing mark on your front cover and also on the degree wheel. You'll need a piece of wire that can be attached to the block and bent to point to the correct location on the large degree wheel.

Once done ,you can move the indicator to the valve tip and rotate the crank and check clearances and cam timing as shown on the cam card. This will also be the time you can check Piston to Valve clearance as it goes through its cycle..............For more detail check on line.........
Now you can have some confidence that nothing will hit or impact your new parts. Good Luck