renbo

yes that is the problem

i have enjoyed this discusion on the jabiru engines. although some confusion on detonation , preignition ect

i am not an engineer, but engines are a hobby , from what i have read there seems to be a problem with mixture distrubution,

and from this detonation , but know one has mentioned doing a plug check which would tell you what is going on.

having a certain octane rating the easiest fix would be retard the timing a couple of degrees , water methinol injection set to

work at wot is a good if a bit over the top,but easy to rig up, valve failure is a sign of overheating,faliure to dissipate the heat to the seat/

head.the silicone cylinder base seal shouldnt bother it its still metal to metal with silicone filling the gaps ,its all held together

by the bolts stretched in tension,of course this is just my two bobs worth,but i know that detonation destroys engines

through heat and mechanical shock the black or silver balls on the plug centre electrode porceline is a giveaway

though knowone has mentioned it, i am only going on what is being said, i havent looked at a failed jab engine

but would like to as its a tricky problem they seem to have, i think the plugs would show whats going on ,

at least thats how i did it when i had a harley drag bike, something is set to close to the edge on these engines and some at least

thats over the edge , they need more head cooling , higher octane , less timing, richer mixture, better distribution, especially

if its only certain cylinders

yeh ,mine is nothing like the snipe its the real m'coy mines just a small as it can be UL i will put some pics up ,but have to work out how to shrink them

cause it wont upload any,i have tried

no a tripe hound -triplane the first military triplane ,i think

g'day all. renbo from qld ,

i am building a radial powered scaled sopwith

hope to have it flying in about a year,depending on work ,money,

anyone like this sort of thing ?