|
Re: That's gotta slow you down a bit
[Re: rebel]
#2367694
09/09/17 12:22 AM
09/09/17 12:22 AM
|
Joined: Sep 2014
Posts: 4,457
Washington
madscientist
master
|
master
Joined: Sep 2014
Posts: 4,457
Washington
|
Well I've been to my machinist, spent near on an hour n a half checking everything. All bearings are good, just a shy under 0.002 clearance. His conclusion is....replace the Damper & Cam. Well I have a new cam so it's only buy a new ATI. Did you ever mention what damper you had?
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
|
|
|
Re: That's gotta slow you down a bit
[Re: madscientist]
#2367770
09/09/17 04:04 AM
09/09/17 04:04 AM
|
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
OP
master
|
OP
master
Joined: Dec 2006
Posts: 4,647
aotearoa
|
Well I've been to my machinist, spent near on an hour n a half checking everything. All bearings are good, just a shy under 0.002 clearance. His conclusion is....replace the Damper & Cam. Well I have a new cam so it's only buy a new ATI. Did you ever mention what damper you had? yeah maybe not but it was an ATI. Both my streetcar & racecar have an ATI, so it guess they have a best before date so its time to change. I did have a Fluid Damper in the early days, don't think i'll revisit them again. Had to cut that one off when it went south.
|
|
|
Re: That's gotta slow you down a bit
[Re: fast68plymouth]
#2367780
09/09/17 08:16 AM
09/09/17 08:16 AM
|
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
OP
master
|
OP
master
Joined: Dec 2006
Posts: 4,647
aotearoa
|
I would see if you could find an 8620 cam core for the replacement, and verify with the cam grinder you absolutely have enough spring load to keep the valvetrain under control.
I would also be trying to figure out what caused that witness mark on the lobe.
I don't know what your combo is, but it's the kind of mark I'd expect to see if there was some minimal contact between an aluminum rod and the cam.
Since you have an aluminum block its also certainly possible that just before/after the cam actually let go it whipped around inside the cam tunnel, and that's just the mark that was left.
If so, there should be a corrosponding mark in the tunnel where the contact was made. when i first started using this cam we found we had valve float. the specs that Bullet told us were just too light. i chewed out the lock area on the valves in the first season. i went for new valves & stiffer springs the next season & the ET dropped 0.1 on average. the valves are now looking good except theres a few bent ones after this happened. the mark on the lobe wiped off with a rag. just milky oil with all the rain we've had lately. i have heavy dew in the mornings on all the steel in the shed. i'm sick of the rain. its winter here The rods are Steel Molnars so no contact. The Cambelt drive actually controlled the cam quiet well when it broke. I was taking a passenger for a ride at the time, had just pulled second gear after the fronts had touched down when pop & we went into coasting mode.
|
|
|
Re: That's gotta slow you down a bit
[Re: rebel]
#2367887
09/09/17 01:18 PM
09/09/17 01:18 PM
|
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
|
Like I said initially...... Go for a cam made from an 8620 core(the copper colored ones).
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: That's gotta slow you down a bit
[Re: rebel]
#2368016
09/09/17 08:38 PM
09/09/17 08:38 PM
|
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
|
Gold/copper.... Yes
For some reason I thought you had a small block.
What heads, springs, pressures, and rocker ratios are you going to run with that cam?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: That's gotta slow you down a bit
[Re: rebel]
#2368135
09/10/17 02:24 AM
09/10/17 02:24 AM
|
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,502
So. Burlington, Vt.
|
I just wanted to see if you had an extreme rocker ratio and possibly not enough spring.
Sounds like you should be okay.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
|
|
|
Re: That's gotta slow you down a bit
[Re: racerhog]
#2368411
09/10/17 06:00 PM
09/10/17 06:00 PM
|
Joined: Dec 2006
Posts: 4,647
aotearoa
rebel
OP
master
|
OP
master
Joined: Dec 2006
Posts: 4,647
aotearoa
|
Better get that block squared up.... ?? not sure i understand.
|
|
|
|
|
