Valve Tappet Clearence K Motors?

[camerondownunder88]

Hi,

After slowly working out how to get my solid lifter to 5K conversion sorted I decided to set my valve tappet clearence to what the K-B motor had which is 0.010mm intake and 0.023mm exhaust.

 

But tonight I flicked through my 4K manual for a KE70 and it runs 0.020mm intake and 0.030 exhaust clearence.

 

So what would be the better one to go with? the tighter K-B ones or the larger 4K ones?

 

Also what is the possible problems I can expect with a gap that is to small or to large?

 

Cheers

Cameron

[Robert]

To tight, valve will not seat properly (Loss of compression, valve cannot cool down etc.)

 

To large of a gap, lots of ticking, loss of power due to less lift and damage to the top of the valve stem from the rocker bashing on it.

 

Id go with the later model setting.

[Felix]

Depends on your cam specs.

 

My tighe 113 cam clearances (hot) are .010" inlet and .012" exhaust.

[camerondownunder88]

Good point felix. I am running a KE70 4K-C cam so I should us those specs.

 

If i had the K-B cam still with 10 degrees more duration I could run the smaller gap but hey ill run the newer larger limit I think till I get a cam regrind.

 

Thanks

Cameron

[tojo2]

On your figures, it looks like you are getting confused by millimeters and thousands of an inch. :D

 

Any idea how small 0.020 mm is ? And how large 0.020" is ? Just a tip :

 

Make sure you are using the right feeler gauge, and if your given measurement is for hot or cold engine.

Edited May 27, 2007 by tojo2

[Taz_Rx]

I set my tappets in the 4k with camtech 609 to 8 thou on the inlet, 12 thou on the exhaust COLD. Thats what I found in a list of all cars clearance in a mechanics workshop manual.