Weber selection and initial jet tuning

[blodi]

Glad others are all getting something out of this! Started this just to educate myself, but happy others can learn with me!

 esmit208, I don't know if my tuner has an altimeter, but I'll look.  It was varying temps when I did various pulls, so I always kept that in mind.  I think we are between the last two setups as far as e tubes and such...then just figuring out the accell circuit.  

Hopefully tuning can resume March/April once the snow here in Michigan clears. In the meantime I have plenty to do: lash pad fix, rear disc conversion, some small electrical fixes...etc. 

[240260280]

Blodi, you need a skidoo!

[esmit208]

12 hours ago, blodi said:

Glad others are all getting something out of this! Started this just to educate myself, but happy others can learn with me!

 esmit208, I don't know if my tuner has an altimeter, but I'll look.  It was varying temps when I did various pulls, so I always kept that in mind.  I think we are between the last two setups as far as e tubes and such...then just figuring out the accell circuit.  

Hopefully tuning can resume March/April once the snow here in Michigan clears. In the meantime I have plenty to do: lash pad fix, rear disc conversion, some small electrical fixes...etc. 

Your local weather channel broadcasts the current barometric pressure (altimeter) during the local weather. They present it in INCHES OF MERCURY.......29.96......29.94....etc...etc. This setting is very important in aviation. Without it a pilot will not know his correct altitude.

[blodi]

Got the 175's machined down to 170.  Popped one in last night...should be all good to go!.....well...in a couple months once I get everything else done on the car and it's warm/dry enough. 

[blodi]

Still haven't driven the car anymore, but the weather is just starting to turn it seems.

I did rig up my chokes finally. Went to the local hobby shop and got about $15 worth of R/C airplane linkage parts and it seems to work pretty good!

IMG_4474 by blodi, on Flickr

IMG_4476 by blodi, on Flickr

 

[esmit208]

Looks GREAT! SK's have an accelerator pump, no choke. Let us know how the choke mechanism works. Fortunately here in Florida, at least central Florida, not too many cold morning starts to evaluate the accelerator pump. STAY ON IT!

[240260280]

Looks great!

[blodi]

60+ degree day here yesterday so I fired her up after work. The new choke setup works great! Started immediately. 

Backed it out the driveway....thought I started hearing that tapping noise again...got a bit down the road and could hear it wasn't hitting on all cylinders.....

Later on I pulled the valve cover and ...son of a.....it happened again!

IMG_4498 by blodi, on Flickr

Found the lash pad...full in tact this time...

IMG_4499 by blodi, on Flickr

 

Really confused what might be causing this. I readjusted the valve to .010 when I installed the new lash pad.  A quick look has me wondering if the lash pad on this particular valve is thinner than the others....

IMG_4501 by blodi, on Flickr

IMG_4500 by blodi, on Flickr

I think I'll pull one of the other lash pads and measure it. Maybe when this engine was built a thinner last pad accidentally was installed on this valve. It would still be a bit odd as I had put 3-4k miles on this engine before it had issues.  And regardless of the thickness the pad still sits down into the retainer the same amount. What else could cause the lash pad to pop out? Sticky valve? The engine has only the 3-4K I've put on it since it was built and has had a generous amount of oil changes.  Maybe I didn't get the spring that holds the rocker valve in place on correctly? I'm just stumped a bit.  Ideas?

 

 

 

 

[siteunseen]

Aftermarket lash pads are flat on bottom, Nissan's have a hole the valve stems fits in.  Is your's flat or does it have the hole?

Another thing I've seen on this forum is the mouse trap springs hooked in the wrong way.  My dementia is iffy today but i think it was one of @240260280 friends, Kammy?

Just some guesses, also some write ups that may be useful.

https://www.google.com/search?rlz=1C1BOFA_enUS494US494&ei=-OCWWqiYCYLisAWuk5PYDw&q=lash+pad+fell+off+classiczcars.com&oq=lash+pad+fell+off+classiczcars.com&gs_l=psy-ab.3...55397.67929.0.69656.49.31.2.0.0.0.126.2114.30j1.31.0....0...1c.1.64.psy-ab..24.1.84...0j0i7i10i30k1j0i7i30k1.0.cwiVEIcihMo 

[esmit208]

Quite worrysome. I would consult a DATSUN/NISSAN professional on this one. Let us know what solution you come up with. Much luck!

[gundee]

This is the same valve as last time? Hmmmm. Interesting. I don't see anything obvious. The wipe pattern on rocker arm looks real good.

[240260280]

Check the wipe pattern as a first step.

If ok then pull plugs and use remote starter to crank while you watch valves move,