SFT cam valve adjustment question
#2424852
12/28/17 01:21 PM
12/28/17 01:21 PM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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This has been discussed many, many times, but, here goes again.. I have tried all the different ways to adjust valves. For the past several years I have been doing one cylinder at a time and rotating the engine to put a valve at max lift( whether it be intake or exhaust), to adjust the other valve for that cylinder. Where am I going wrong????
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: 68LAR]
#2425107
12/28/17 10:52 PM
12/28/17 10:52 PM
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Joined: Jan 2003
Posts: 10,088 Frostbitefalls MN (Rocky&Bullw...
gregsdart
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I went to the trouble of measuring lash at ten degree intervals just to see how much they changed from each position. On a roller cam with 340 on the seat for preasure, they varied .004 to .0045. So with a mild sft cam with only 150 or less on the seat and much less over the nose i would guess the flex would be .002 or less, not enough to worry about. IMHO the one thing that can be gained by very accurate positioning for setting each valve is to find any problems early on.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: SFT cam valve adjustment question
[Re: gregsdart]
#2425279
12/29/17 11:52 AM
12/29/17 11:52 AM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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Ok, thanks for the replies. But just for kicks, why is the way I've been doing it not as good as suggested? Why is one way better than the other. Not trashing any suggestion, just curious why one way is better than the other? My cam, by the way is a smaller SFT. 259*/266* tight lash .014"/.018" .633/.627" with 1.6 rockers.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: fbs63]
#2425489
12/29/17 07:33 PM
12/29/17 07:33 PM
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Joined: May 2008
Posts: 5,399 Aurora, Colorado
451Mopar
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You have to make sure the lifter is on the base circle of the lobe. New lobe designs make it a little more difficult to find that point. I do the exhaust just opening, intake almost closed method and never have an issue. As stated above, once you do it a few times it becomes second nature. Same here. When I checked my newest cam, the lobe closed -0.001 below the base circle, then returned to the base circle setting. If setting exhaust at max intake, it might be in that range?, but at base circle at intake closing.
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Re: SFT cam valve adjustment question
[Re: 451Mopar]
#2425507
12/29/17 07:50 PM
12/29/17 07:50 PM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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You have to make sure the lifter is on the base circle of the lobe. New lobe designs make it a little more difficult to find that point. I do the exhaust just opening, intake almost closed method and never have an issue. As stated above, once you do it a few times it becomes second nature. Same here. When I checked my newest cam, the lobe closed -0.001 below the base circle, then returned to the base circle setting. If setting exhaust at max intake, it might be in that range?, but at base circle at intake closing. I understand the base circle thing. Where I have a question is the replies. When adjusting the intake. Do it when the exhaust is just opening. I guess you have to monitor so there just begins to have "zero" gap. Same for doing the exhaust. Adjust when intake is just closing??? Seems to be not so precise or exact to me. Maybe I'm reading too much into this. Also, will .001" make that big a difference in performance? I'm not trying to be a pain in the butt, just trying to clarify things. in my semi-empty head.. Thanks for understanding.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: @#$%&*!]
#2426103
12/30/17 11:16 PM
12/30/17 11:16 PM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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Interesting, very interesting....
Last edited by 68LAR; 12/30/17 11:17 PM.
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: mopar dave]
#2426678
12/31/17 08:55 PM
12/31/17 08:55 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
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Get a remote start or make one if ya don't have one first thing, then bump engine over til exhaust just starts to open, adjust intake valve on that cylinder. bump again til intake is almost closed, then adjust exhaust on that cylinder. Once done a couple times, you will run right thru them within 15-20 mins. As stated, when done this way with the remote starter switch, it’s pretty quick.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: SFT cam valve adjustment question
[Re: 68LAR]
#2426681
12/31/17 09:06 PM
12/31/17 09:06 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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I use the 180* method with a remote start trigger. Takes me about 3/4 of a beer. Once a year, and after 7 years with this motor I’m yet to find anything alarming.
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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Re: SFT cam valve adjustment question
[Re: StealthWedge67]
#2427226
01/01/18 04:51 PM
01/01/18 04:51 PM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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I use the 180* method with a remote start trigger. Takes me about 3/4 of a beer. Once a year, and after 7 years with this motor I’m yet to find anything alarming. Care to explain? The 180* method, that is, I got got the beer part!
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: 68LAR]
#2427254
01/01/18 05:29 PM
01/01/18 05:29 PM
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Joined: Jan 2003
Posts: 17,928 Akron, Ohio
ProSport
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Larry, It really pays to learn the EOIC method, exhaust open intake closes, as I think some have already mentioned.
I have a starter button on my firewall. I bump the starter button, as soon as the exhaust rocker starts to move(nose of rocker moves down) I check the intake rocker lash.
Bump starter until intake rocker arm nose goes all the way down and bump again til it starts to move upward, set exhaust rocker lash.
I've tested this method against the MP 180 degree method and the lash was the same. It may not work for every single cam but I don't know why it wouldn't. I do this on my purpleshaft solid cams and I did it this way on my 700 lift roller in my '69 Dart.
This is a very quick and easy method of checking lash.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: SFT cam valve adjustment question
[Re: 68LAR]
#2427259
01/01/18 05:37 PM
01/01/18 05:37 PM
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Joined: Jan 2003
Posts: 17,928 Akron, Ohio
ProSport
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I also like to set a small level on my valve cover and jack up the rear of the car until the valve cover is level. Now I can remove my valve covers without oil dripping out of the rear of the heads.
And if you have a decent set of feeler gauges, you can literally leave the feeler gauge under the rocker arm while bumping the motor over, it will give you a good feel for what the cam lobe is doing.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
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Re: SFT cam valve adjustment question
[Re: ProSport]
#2427452
01/01/18 10:56 PM
01/01/18 10:56 PM
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Joined: Oct 2003
Posts: 4,016 South Park, Pa.
68LAR
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I also like to set a small level on my valve cover and jack up the rear of the car until the valve cover is level. Now I can remove my valve covers without oil dripping out of the rear of the heads.
And if you have a decent set of feeler gauges, you can literally leave the feeler gauge under the rocker arm while bumping the motor over, it will give you a good feel for what the cam lobe is doing. Thanks Bob, I do have a remote starter switch. I'm going to try the EOIC method and compare it to the way I have been doing it. Thanks everyone for the input. I appreciate it. ( that level idea is something I never thought of). I'll try that also....
4 speed street legal. Best time 10.99 @ 124 mph on 93 octane pump gas @ 3926# total weight
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Re: SFT cam valve adjustment question
[Re: 68LAR]
#2427457
01/01/18 11:08 PM
01/01/18 11:08 PM
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Joined: Jul 2006
Posts: 4,319 Puyallup, WA
StealthWedge67
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master
Joined: Jul 2006
Posts: 4,319
Puyallup, WA
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I use the 180* method with a remote start trigger. Takes me about 3/4 of a beer. Once a year, and after 7 years with this motor I’m yet to find anything alarming. Care to explain? The 180* method, that is, I got got the beer part!
LemonWedge - Street heavy / Strip ready - 11.07 @ 120
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