Street Hemi rattles when running

[RustyRatRod]

Hmmm, cold piston slap and thicker oil...sounds familiar..did someone mention that?

...yeah. GARLITS.




LOL

 

[rev.ronnie]

...yeah. GARLITS.




LOL

Haha!

Did you see that Don is trying to get a new, huge museum built? He's looking for investors he is going for the huge, "tourist attraction" approach...

Personally, I like it the way it is, burnouts in the driveway and all.

 

[RustyRatRod]

Haha!

Did you see that Don is trying to get a new, huge museum built? He's looking for investors he is going for the huge, "tourist attraction" approach...

Personally, I like it the way it is, burnouts in the driveway and all.

Yeah, but it would be cool.......I think in our lifetime, that's all that will be left of motorsports. Museums.

 

[super-bee_ski]

It's a Hemi, they ALL make noises

 

[RustyRatRod]

It's a Hemi, they ALL make noises

Purdy much.

 

[skyman51]

I have now spoken with three of the best known Hemi builders in the country, one of which built my motor. They all said the noise I hear is normal and the only oil to use in the motor is 20w50 with additive or Pennzoil 25w50 racing oil which alreday has over 2800 ppm zinc in it. I definitely learned something I did not know.

 

[court9155]

I have now spoken with three of the best known Hemi builders in the country, one of which built my motor. They all said the noise I hear is normal and the only oil to use in the motor is 20w50 with additive or Pennzoil 25w50 racing oil which alreday has over 2800 ppm zinc in it. I definitely learned something I did not know.

Im not a hemi owner, but that seems like a pretty thick oil for a street motor.

Good info on oil:

http://www.turbodieselregister.com/TDR57_Oil.pdf

 

[skyman51]

Im not a hemi owner, but that seems like a pretty thick oil for a street motor.

Good info on oil:

http://www.turbodieselregister.com/TDR57_Oil.pdf

I have been driving for 45 years. In the day multi grade oils did not exist. We used a straight 30W. I have always been a Chevy guy and knew nothing about the Hemi. Yes this is the street version of the Hemi, but I have been told it has been basically detuned from the race version, otherwise it is the same motor in most respects. I spoke with the owner of the car for 30 years I just bought. He said he used nothing but Castrol 20w50 in it the whole time he owned it. I will take the advice of the experts and not relate it to my knowledge of Chevy. The Hemi is a different animal. All of these engine builders put out a maintenance sheet with all their rebuilds. Each one specifys 20w50 oil. They must know what they are talking about.

 

[RustyRatRod]

Yeah. If Shepard says 20/50, then 20/50 it is. LOL Hemis already have some loose tolerances and I'm sure he didn't stray from that. It's a good call.

 

[rev.ronnie]

I run 20/50 in my charger for the same reason. It has .004" piston clearance and slaps like hell when it's cold.

When I hone Hemi blocks, I leave a deeper Rmax depth so the bore actually retains more oil. I still leave a final surface RA finish of 7 or finer, but having the deeper Rmax does not allow the oil scraper ring to wipe the bore dry. this helps prevent head-land scuffing on top heavy pistons. I do this on 348-409 engines as well.
Now, this procedure will allow you to run thinner oil because it is retained where it needs to be through proper machining protocol BUT, they still rattle when they are cold, so sometimes heavy oil is still the choice.

A Superstock hemi, on a record run, will be turning 9000+ rpm through the traps with 3 qts of 00 wt oil in the whole system...and no oil pressure! Now, that's one extreme to another!

These Hemis are not rocket science. It just takes quality machinery, experience and dedication to detail to build one right. But, then, doesn't every engine?

 

[snakeoil24]

Using 20-50 is fine in the Hemi just remember in the Cold months to use a heater dipstick in the oil the night before then you wont have any issues.. also for you guys new to Hemis think about using oil thru pushrods for the mechanical roller motors and a good set of crane Rollers, these do not require bushing the lifter bores and the same goes for the Comp cams Roller lifters.. Makes these top ends a lot happier at low revs.

 

[rev.ronnie]

Using 20-50 is fine in the Hemi just remember in the Cold months to use a heater dipstick in the oil the night before then you wont have any issues.. also for you guys new to Hemis think about using oil thru pushrods for the mechanical roller motors and a good set of crane Rollers, these do not require bushing the lifter bores and the same goes for the Comp cams Roller lifters.. Makes these top ends a lot happier at low revs.

I agree...thru oiling pushrods is a great plan, especially with the later engines using Hyd. cams. The solid lifter engines, that have clearance in the valve train, take to the splash oiling better, but the hyd. engines are always metal to metal in the rocker, pushrod, lifter area.

I always use a grooved cam in the Hemis too. Full time oiling on street engines is a must. Sometimes you need to make sure the cam manufacturer does this, or do it yourself.

 

[court9155]

I have been driving for 45 years. In the day multi grade oils did not exist. We used a straight 30W. I have always been a Chevy guy and knew nothing about the Hemi. Yes this is the street version of the Hemi, but I have been told it has been basically detuned from the race version, otherwise it is the same motor in most respects. I spoke with the owner of the car for 30 years I just bought. He said he used nothing but Castrol 20w50 in it the whole time he owned it. I will take the advice of the experts and not relate it to my knowledge of Chevy. The Hemi is a different animal. All of these engine builders put out a maintenance sheet with all their rebuilds. Each one specifys 20w50 oil. They must know what they are talking about.

Im not saying they dont know what they are talking about at all. Run what the bearing clearances are set up for, just let that sucker warm up and get the oil nice and warm before you romp on her lol!