noisier cam chest after 777 cams
#1
noisier cam chest after 777 cams
So I guess I must have been mistaken with the type of noise that comes from upgrading cams. After installing cams I noticed a sploshing, blubb sound coming from the cam chest area. I thought this was the increase in sound everyone talks about with woods cams. Talked to a tech and he says just an increase in drive train noise (ticking) from upgrading cams and I should just adjust my FM pushrods a few more sides to get rid of the noise going on now.
I though this may be my fuel pump but my light goes off after a second so it should be working just fine.
Is there anything I should be looking into? Anyone experience this noise? I can't think of any other way to describe it.
I though this may be my fuel pump but my light goes off after a second so it should be working just fine.
Is there anything I should be looking into? Anyone experience this noise? I can't think of any other way to describe it.
#2
So I guess I must have been mistaken with the type of noise that comes from upgrading cams. After installing cams I noticed a sploshing, blubb sound coming from the cam chest area. I thought this was the increase in sound everyone talks about with woods cams. Talked to a tech and he says just an increase in drive train noise (ticking) from upgrading cams and I should just adjust my FM pushrods a few more sides to get rid of the noise going on now.
I though this may be my fuel pump but my light goes off after a second so it should be working just fine.
Is there anything I should be looking into? Anyone experience this noise? I can't think of any other way to describe it.
I though this may be my fuel pump but my light goes off after a second so it should be working just fine.
Is there anything I should be looking into? Anyone experience this noise? I can't think of any other way to describe it.
Per Jamie' recommendation I put another 1/2 turn preload (3 flats) on the push rods. Problem largely solved but 777s are high lift cams, you're going to have some noise, especially when the engine is hot.
#5
any higher lift cams will be noisy.
you are asking a mechanical linkage to lift higher and faster ( steeper ramp) than before...and the springs to act faster.
if the install is correct, it'll be noisier--- expect clatter from the cam chest to the valves
too tight pushrods (remember everything has to expand so there are clearance specs) will keep your valves from seating
get to an experienced performance tech- they will have an idea of "normal" sounds.
a guy at work recently thought his pushrods were "funny"...30 seconds in the parking lot ( after the bike cooled) showed normal feel
mike
you are asking a mechanical linkage to lift higher and faster ( steeper ramp) than before...and the springs to act faster.
if the install is correct, it'll be noisier--- expect clatter from the cam chest to the valves
too tight pushrods (remember everything has to expand so there are clearance specs) will keep your valves from seating
get to an experienced performance tech- they will have an idea of "normal" sounds.
a guy at work recently thought his pushrods were "funny"...30 seconds in the parking lot ( after the bike cooled) showed normal feel
mike
Last edited by mkguitar; 09-05-2014 at 04:53 PM.
#7
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#9
got a stethoscope?
even a long screwdriver- put the end against your ear-bone
make sure that you are hearing noise from the cam chest, not the intake or breathers sucking and gurgling
an experienced ear/opinion might be worth getting
For example using a stethoscope I was recently able to change a diagnosis from bottom end bearing or piston slap ( GM 4.8) to fan clutch knocking.
a tear down to a $35 part swap
mike
even a long screwdriver- put the end against your ear-bone
make sure that you are hearing noise from the cam chest, not the intake or breathers sucking and gurgling
an experienced ear/opinion might be worth getting
For example using a stethoscope I was recently able to change a diagnosis from bottom end bearing or piston slap ( GM 4.8) to fan clutch knocking.
a tear down to a $35 part swap
mike
#10
got a stethoscope?
even a long screwdriver- put the end against your ear-bone
make sure that you are hearing noise from the cam chest, not the intake or breathers sucking and gurgling
an experienced ear/opinion might be worth getting
For example using a stethoscope I was recently able to change a diagnosis from bottom end bearing or piston slap ( GM 4.8) to fan clutch knocking.
a tear down to a $35 part swap
mike
even a long screwdriver- put the end against your ear-bone
make sure that you are hearing noise from the cam chest, not the intake or breathers sucking and gurgling
an experienced ear/opinion might be worth getting
For example using a stethoscope I was recently able to change a diagnosis from bottom end bearing or piston slap ( GM 4.8) to fan clutch knocking.
a tear down to a $35 part swap
mike