|
Re: Hemi oil consumption
[Re: fast68plymouth]
#2571831
10/30/18 10:12 PM
10/30/18 10:12 PM
|
Joined: Mar 2010
Posts: 984
Tennessee
Hemi ragtop
OP
super stock
|
OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
|
Fundamentally I agree with Chip.
It’s probably an oil control issue with the rings....... for one reason or another.
That being said, I’d swap out the intake seals first to rule that out before pulling the motor.
But honestly, I wouldn’t expect it to use a qt in 125 miles even if it had no valve seals.
As for worn guides....... I freshened and ported a set of iron hemi heads off a MP crate motor that had 70,000 miles on it........ the guides were still perfect. I was shocked...... but miracles happen every now and then.
Of course, I also went through a set that only had the dyno time on them...... that had a few ex guides with .009 clearance, and the tightest intake was about .005. Hey thanks. This is the type of info that I needed! Two days of struggling to just get the header bolts loose on the passenger side. I think I will pull the engine just to check out the lower end. I would hate to go through this again!
|
|
|
Re: Hemi oil consumption
[Re: Hemi ragtop]
#2571833
10/30/18 10:13 PM
10/30/18 10:13 PM
|
Joined: Mar 2010
Posts: 984
Tennessee
Hemi ragtop
OP
super stock
|
OP
super stock
Joined: Mar 2010
Posts: 984
Tennessee
|
Fundamentally I agree with Chip.
It’s probably an oil control issue with the rings....... for one reason or another.
That being said, I’d swap out the intake seals first to rule that out before pulling the motor.
But honestly, I wouldn’t expect it to use a qt in 125 miles even if it had no valve seals.
As for worn guides....... I freshened and ported a set of iron hemi heads off a MP crate motor that had 70,000 miles on it........ the guides were still perfect. I was shocked...... but miracles happen every now and then.
Of course, I also went through a set that only had the dyno time on them...... that had a few ex guides with .009 clearance, and the tightest intake was about .005. Hey thanks. This is the type of info that I needed! Two days of struggling to just get the header bolts loose on the passenger side. I think I will pull the engine just to check out the lower end. I would hate to go through this again! So, what should I shoot for in valve guide clearance!
|
|
|
Re: Hemi oil consumption
[Re: Lee446]
#2571890
10/30/18 11:42 PM
10/30/18 11:42 PM
|
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
|
Dwayne, whar guide clearance do you usually go for? And what seals do you recommend? I don’t have tons of hemi experience to draw upon....... but the trend seems to be that they run more clearance than what would be typical for that stem diameter..... at least for a street duty motor. I don’t think the ex guides get lubed very well because of the angle they’re on. The valve stems themselves are quite small too for “5/16” ...... typically .307 ex, .308 int. If the guides were small enough to get there, I’d run .0015 int, .0025 ex clearance. Steel jacketed viton seals, and I’d leave the chimney spring off on the ex side.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: Hemi oil consumption
[Re: fast68plymouth]
#2571940
10/31/18 01:59 AM
10/31/18 01:59 AM
|
Joined: Aug 2003
Posts: 43,219
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,219
Bend,OR USA
|
[quote=Lee446]
The valve stems themselves are quite small too for “5/16” ...... typically .307 ex, .308 int.
If the guides were small enough to get there, I’d run .0015 int, .0025 ex clearance.
Steel jacketed viton seals, and I’d leave the chimney spring off on the ex side. I was told years ago by several different 426 Hemi motor SO CA really good machine shops to run the intake to guide clearances tighter than normal, .0015 or less and on the exhaust to use .0017 to .0022 max on new guides and valves for street use, less on a drag race motor  Both Larry Shepard and Tom Hoover verified those number as good to use in one of the old Mopar drag race seminars I attended several years later
Last edited by Cab_Burge; 10/31/18 02:00 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
Re: Hemi oil consumption
[Re: Hemi ragtop]
#2572434
10/31/18 11:53 PM
10/31/18 11:53 PM
|
Joined: Aug 2003
Posts: 43,219
Bend,OR USA
Cab_Burge
I Win
|
I Win
Joined: Aug 2003
Posts: 43,219
Bend,OR USA
|
Last edited by Cab_Burge; 10/31/18 11:53 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
|
|
|
|
|
