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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
Well… no matter what’s been said in here the fortune decided otherwise.
started pulling the rockerboxes and to my great relief found the culprits.
look how deep and consumed this is - the front right exhaust got elongated or something as it was almost finger tight.
there is no play anywhere - the rockers are rock solid radially. Axial play is 0.3mm - will shim it anyway.
so onto the lathe and will make shaft locker bushings. Then it is just a question of getting it all buttoned up. The oil brass glitter must be the nose cone then.
I heard about rocker lockers btw but never in my life would I have thought spinning rocker shafts could make this kind of pronounced noise. I use very good ear plugs and this ticking could be heard with the plugs at 50mph!!!!
I said to myself - this is the nature of the best. In fact I couldn’t have been closer to the truth.
seems like the previous oem cam with its sedate ramps and lift could not rotate the shaft that much although I heard this ticking before although not that pronounced.
The higher lift and more aggressive ramps of the new cam simply started to wiggle the cam around.
all in all - sigh - what a relief
attaching two clips: the shaft moving with the rocker on cold engine and high idle hot engine oil pressure - you will hear the distinctive high pitched clatter. 3bar of pressure should be more than sufficient to feed the lifters and the top easy.
Front intake Two of a perfect pair - shaft and front exhaust bolt.
Been riding but it keeps the rattle and now it rattles even when cold. Installed rockerlockers - no change. today i decided to pull the front head and jug and found NOTHING. Engine clean inside, still some hone crosshatch remaining, no scuff marks, piston still has the machining marks on it all around. Will measure piston and bore in the afternoon. rockers to shafts measure .05mm in worst place. Side to side clearance is .25-.3mm. Valves have no play in guides. Lateral play at the conrod head 2-3mm not more. Radial play at big end and piston non distinguishable. To me this is a case of maybe new hone, new set of nominal rings and the engine is good to go. Still it rackets like crazy. I can hear it wit ear plugs…
tried the original lifters, same noise.
it simply sounds like there is toooooo much valve lash. Just that.
Been riding but it keeps the rattle and now it rattles even when cold. Installed rockerlockers - no change.
today i decided to pull the front head and jug and found NOTHING.
Engine clean inside, still some hone crosshatch remaining, no scuff marks, piston still has the machining marks on it all around. Will measure piston and bore in the afternoon.
rockers to shafts measure .05mm in worst place. Side to side clearance is .25-.3mm.
Valves have no play in guides.
Lateral play at the conrod head 2-3mm not more. Radial play at big end and piston non distinguishable.
To me this is a case of maybe new hone, new set of nominal rings and the engine is good to go. Still it rackets like crazy. I can hear it wit ear plugs…
tried the original lifters, same noise.
it simply sounds like there is toooooo much valve lash. Just that.
Pull the cam cover and check if the pinion sprocket and gear are loose.
hi - just to update on the thread. been riding other bikes in the meantime but pulled the top off of the lump to find... nothing. no play, no scoring, no problems... just the nature of the beast with the bloody EV13 cam.
I will use this occasion and give the cylinders new hone and OEM piston rings + gaskets and will slap it all tohether.
I micced the cylinders, rocker arms, valve springs and all is well within the factory spec at 50k.
So clean, put it all back together and use the OEM cam.
Speaking of which - I started a topic for looking for an OEM cam for my evo - got a private message I could get one here: 62cobraturbs@gmail.com - does anyone know this vendor or it is another ubiquitous scam?
I have very good news - contrary to the general disbelief I have taken apart the top end to see what was inside. The cylinders were glazed and no honing almost - but they kept their nominal sizing within 0.02mm from top to bottom. Decided to throw new hone on them /myself/ and fitted new OEM rings - the gap was tighter only by 0.01mm BUT the rings themselves were much harder.
Ground and lapped valves, new seals and slapped it all together - the only difference between this and the LOUD state is the original Ngrind camshaft with the original gear - taken off of the EV13.
The bike runs like never before and is DEAD quiet. #$%^&*( Andrews cam did that all the way and almost caused me to loose my mind.
Been riding but it keeps the rattle and now it rattles even when cold. Installed rockerlockers - no change. today i decided to pull the front head and jug and found NOTHING. Engine clean inside, still some hone crosshatch remaining, no scuff marks, piston still has the machining marks on it all around. Will measure piston and bore in the afternoon. rockers to shafts measure .05mm in worst place. Side to side clearance is .25-.3mm. Valves have no play in guides. Lateral play at the conrod head 2-3mm not more. Radial play at big end and piston non distinguishable. To me this is a case of maybe new hone, new set of nominal rings and the engine is good to go. Still it rackets like crazy. I can hear it wit ear plugs…
tried the original lifters, same noise.
it simply sounds like there is toooooo much valve lash. Just that.
oh how I wish you were my neighbor id have you at my garage with your hand and help withith both my evo and twin cam bikes
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after some break.
