Need Hemi Advice

[Fran Blacker]

I've read some MP springs tend to break. Maybe someone can verify this.

 

[not so famous bob]

pretty sure factory mechanical lash is .028"/.032". may have some straight pin pistons in it; they're noisey when cold. looks like milodon plug tube seals. unfortunately unknown engines are like a box of cracker jacks; the surprise is inside.

I go w/ this post. , .028 and .032 for a stocker and a lot of older cam designs. We use to tighten the lash down to .024 and .028 w/ no noticeable diff. MY PISTON PINS WEREN`T NOIST THO, I DID HAVE ONE W/ LOOSE CYL WAL TO PISTON CLEARANDCE THAT WAS NOISY till it heated up.

 

[Hemirunner]

Coil bind or the wrong spring for the cam.

I get the common sense to do that, but would it account for the louder ticking in the area where the badly broken spring was?
Fyi there is no misfire, runs very strong.

bent valve can sound like a tick. Could be the wrong spring for the application.

 

[Johnpat]

Remember in the 1st post you weren't for sure
about the lash to set,then you found a receipt for
cam install.
What was the lash settings to start with??
I would start with those settings,& cold maybe
a little tighter
Just because you found a receipt doesn't mean
that is what it ended with.
You may be binding the springs???

 

[dan juhasz]

One last question. How much oil does the hemi pump up to the valve train when running. Is it possible to check adjustment when running?
I remember in the old days when ever other car had a slant 6, I used to adjust those vales running all the time. They hardly sprayed any oil around.

 

[HEMI-ITIS]

NO adjustment running!! What a mess that would be.You really need to verify what cam is in there so you have the proper springs.If 2 springs broke IMO it's time for a new set.
All I will say,,better to be safe or You will be sorry.It Might be a good time for a cam change with the right springs!

 

[wyrmrider]

yep- check how much free clearance at valve open and check your valve lift peek at retainer to seal clearance- are the bottoms of the springs located?

 

[dan juhasz]

yep- check how much free clearance at valve open and check your valve lift peek at retainer to seal clearance- are the bottoms of the springs located?

I'm sorry I don't follow could you phrase it differently? Are you referring to coil bind when fully open? Not sure what you mean by the bottom of the springs located

 

[wyrmrider]

yes clearance between the coils at open or distance left to coil bind
The springs should fit in a cup cast in the head or be located on the inside with a piece that goes over the valve guide
I do not think this is the problem but you really do not want the spring bottoms waltzing around- retainers must match the springs also- tight is good
you can look up spring locators on any camgrinders website but stock works for stock diamante springs

 

[dan juhasz]

yes clearance between the coils at open or distance left to coil bind
The springs should fit in a cup cast in the head or be located on the inside with a piece that goes over the valve guide
I do not think this is the problem but you really do not want the spring bottoms waltzing around- retainers must match the springs also- tight is good
you can look up spring locators on any camgrinders website but stock works for stock diamante springs

What is the minimum clearance that should exist at full open? Nothing locates the bottom of the valve springs.

 

[wyrmrider]

Google is your friend
depends on the spring
too much is almost as bad as too little- spring surge (you do not need to worry about this with a hyd cam)
I say .060 or a (heavy) paperclip

 

[HEMI-ITIS]

Me thinks your pissin in the wind without knowing exactly what cam is there and the spring requirements.