318 Poly Vibration
Ordered a tach and a comp tester.
Had some time today located some great valve adjustment info on fbbo and an online manual.
I adjusted the valves, all were correct or needed a minimal adjustment. One exhaust valve, #7, had zero lash.
Checked pcv, in working order.
Checked oil drains on heads, read that could be an issue with polys, although the passenger side head has slightly smaller openings, nothing clogged, engine clean.
Started engine, fired right up as usual, idled well, as usual, felt that slight vibration as usual.
Checked vacuum to pcv from carb, non-existent, put a vacuum gauge on the carb port, zero at any rpm.
Unhooked power brake booster at manifold, hooked pcv to it. In my mind it seemed to run better, but really no difference, just felt better knowing the engine was 'ventilated.' No oil pushing out the dipstick or valve cover breather. I think I'll run it more like that just to clear any and all moisture out of it.
Can, or should, you run a pcv right from manifold vacuum?
Need to correct that carb vacuum port issue, might have selected the wrong base gasket from the kit, there were 3, I know it was clear when I rebuilt it. Not the main issue though.
I cannot wait to do a comp test and hook up a tach to see what the heck is going on. This engine runs so well, starts no problem, sounds awesome, but something is up.
A friend heard it run a while back and remarked that it is one of the smoothest running engines he's ever heard, but he never heard it before this vibration surfaced.
I also thought I should recheck the flywheel bolts, again, just to make sure I did it as I noted it.
Ranting to myself here, never had an issue appear under such strange circumstances, never get worse, and be the same, doesn't increase or decrease, at all rpms.
Ordered a tach and a comp tester.
Had some time today located some great valve adjustment info on fbbo and an online manual.
I adjusted the valves, all were correct or needed a minimal adjustment. One exhaust valve, #7, had zero lash.
Checked pcv, in working order.
Checked oil drains on heads, read that could be an issue with polys, although the passenger side head has slightly smaller openings, nothing clogged, engine clean.
Started engine, fired right up as usual, idled well, as usual, felt that slight vibration as usual.
Checked vacuum to pcv from carb, non-existent, put a vacuum gauge on the carb port, zero at any rpm.
Unhooked power brake booster at manifold, hooked pcv to it. In my mind it seemed to run better, but really no difference, just felt better knowing the engine was 'ventilated.' No oil pushing out the dipstick or valve cover breather. I think I'll run it more like that just to clear any and all moisture out of it.
Can, or should, you run a pcv right from manifold vacuum?
Need to correct that carb vacuum port issue, might have selected the wrong base gasket from the kit, there were 3, I know it was clear when I rebuilt it. Not the main issue though.
I cannot wait to do a comp test and hook up a tach to see what the heck is going on. This engine runs so well, starts no problem, sounds awesome, but something is up.
A friend heard it run a while back and remarked that it is one of the smoothest running engines he's ever heard, but he never heard it before this vibration surfaced.
I also thought I should recheck the flywheel bolts, again, just to make sure I did it as I noted it.
Ranting to myself here, never had an issue appear under such strange circumstances, never get worse, and be the same, doesn't increase or decrease, at all rpms.
