- Joined
- Dec 10, 2008
- Messages
- 7,253
Nice job on the head fins Jim, the head looks good on there
One of the first changes Terry P made when pushing his Vincent type cylinders out from the standard 84 MM to 92 was to add about 30% more fin area to the barrel and head. He is in Oz so very aware of heat problems. He said if we are making more power we need more cooling.
It all seems to work.
He also uses an oil pump with double the standard output for increased engine cooling and more lube, especially to the cams and followers. No doubt you have already done mods there.
I'm hoping the Alloy barrel will help with cooling my 920, although there have been problems with Maney alloy barrels & liners getting hot spots, out of round etc after just a few thousand miles.
From what I have read, the interference fit being used between liner and cylinder might be a bit inadequate for thermal transfer.
I'm going with 5 thou interference.
All a bit of an experiment! Glen
Be careful with getting too much interference with the sleeves. The barrel will crack between the bores. I cracked two of them trying to keep the liners in contact with the cylinder when hot.
What you need is austentic iron liners -too bad I have never found anyone who makes them anymore.
I have the set of billet cylinders I built with lots of extra thickness. I installed spun cast 355 aluminum liners with Nickasil plating.
I will probably install them one of these days and see if they stay round. Keeping aluminum cylinders round would be a first for me.