SOHC.co.uk Forums > CB350/400

Engine design - is it an 'interference' or 'non-interference'

(1/2) > >>

Sprocket:
As above really, I can see there are cutouts on the top of the pistons which initially led me to believe the pistons could never touch the valves if you put it together wrong (asking for a friend!). However, the shape of the cutouts isn't valve shaped, it's heart shaped and that makes me think it could be there to help combustion and gas flow.

Anyone know the truth? Can the valves hit the pistons?

K2-K6:
Yes,  definitely "interference" type engines.
 
You've probably got 2 teeth out either way on camshaft sprocket and they'll be touching the pistons.  Not much room for error and most bikes are the same.

ka-ja:
You don't need to be two teeth out with a "sports" cam fitted, one tooth out will make the exhaust valves kiss the pistons.

Sprocket:
I see, thanks all!  :)

Trigger:
Even if the valves just kiss the piston this, can result in bent valves. Even if the tappet clearance is too tight they can touch.

Navigation

[0] Message Index

[#] Next page