ET: Engine (Twin) Cylinder / head gap
- Thread starter Nastydad
- Start date
Hi Paul, I´d be allright with 2 thou max., alternatively you could aim for 0.05mm gap. I did 0.03mm on my engines, cannot tell yet, if this will work safely. Not a big deal to have more, at least no deformation likely with 2 thou. My cylinder studs are all stainless, so heat growth will not be as bad on extra bolt stress like with standard ht steel. I think most head bolts on all engines with alu heads get torqued way too much for sealing. Lots of stripped threads from this.
Vic
Vic
The riders handbook does not specify the size of the gap but says to use a little fine grinding paste on the flange and course on the the broad face. Too much clearance can cause distortion. I think I did mine to around 0.002" and have had no blowing joint problems when torqued to 30 ft/lbs.
Yes 2 or 3 thou with a feeler. My limit (the only time I talk Tourqe) is 32ft lbs for the nuts but its dependant on the state and lubrication of the threads so 30 may not be too low. Any small dings in the faces a smear of silicone sealent (smoothed into depression)
Normally........yes but the oil can creep up the hold down studs or between the liner and barrel muff......The height of the top hat on the liner should be carefully measured and checked against the head recess.......once this gets below 0.125" then it can be difficult to get the correct seal between the 2 faces.