GIVE UP T&D
#1519444
10/18/13 01:32 PM
10/18/13 01:32 PM
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Joined: Jan 2003
Posts: 1,606
westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,606
westerly, ri. usa
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 well i now give up, broke another T&D rocker, i am at my wits end, each time right at 2/3 shift, last time i dropped shift rpm from 7000 to 6800 hoping to help, about 10/12 rockers last five years, maybe 30/50 runs on replacements, ex/int any clyinder does not matter, i guess i need to have a "expert" look at my valve train 540 cu stage IV heads .660 roller on the good side went 8.92 151mph before 1st round and got my entry fee back
all parts are sold as is, all parts are considered used no warranties or returns
paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred
site is not monitored 24/7 there might be a delay in response
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Re: GIVE UP T&D
[Re: 440lebaron]
#1519445
10/18/13 01:52 PM
10/18/13 01:52 PM
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Joined: Jul 2004
Posts: 19,317
State of confusion
Thumperdart
I Live Here
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I Live Here
Joined: Jul 2004
Posts: 19,317
State of confusion
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Something`s going into bind and or clearance issues come to mind.  Valve float maybe? Not set up correctly?
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: GIVE UP T&D
[Re: Sammy]
#1519449
10/18/13 07:30 PM
10/18/13 07:30 PM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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I have the single shaft T&D on my 440-1's. .830 lift 325lbs on the seat and boost on top of that. never had a failure driving it on the street or racing it. Something is wrong in your valve train.
are they hitting the retainer on the inside of the rocker? How much valve clearance? hows the geometry? coil bind? Valve float?
BB, TT5,Procharged 3300lb Street Car 4.79/154
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Re: GIVE UP T&D
[Re: bigtimeauto]
#1519450
10/18/13 09:31 PM
10/18/13 09:31 PM
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Joined: Mar 2006
Posts: 9,835
MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,835
MI, usa
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My T&D are used, how old???? .800"@7000 , no issues. Lash stays dead on. My buddy just rebodied his after aprox 700 passes. BB Chevy +1.00" cam lift@1000 psi open Doug
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Re: GIVE UP T&D
[Re: dvw]
#1519451
10/18/13 10:00 PM
10/18/13 10:00 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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I broke one early this year. No telling how many runs they had on them as they came from a NASCAR team form the early 2000's. I had to buy seven used from Ritter because some were mismatched. One of the seven "Dyno time only" broke. LOL
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: GIVE UP T&D
[Re: Leon441]
#1519452
10/18/13 10:17 PM
10/18/13 10:17 PM
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Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
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master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
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not to sound redundant but you have issues that are breaking the rockers. spring surge, insufficient spring pressure, interference of some type. no way you should have that many failures. do you know what your spring pressures are, part number, retainers, spring rate, installed height, open coil clearance?
you need to fill in the blanks and post pics of the failed parts and their installation. unless it's something bizarre it shouldn't take an expert to figure it out, roller valve trains will not live with weak springs.
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Re: GIVE UP T&D
[Re: 440lebaron]
#1519453
10/18/13 11:03 PM
10/18/13 11:03 PM
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Joined: Jan 2003
Posts: 1,606
westerly, ri. usa
440lebaron
OP
top fuel
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OP
top fuel
Joined: Jan 2003
Posts: 1,606
westerly, ri. usa
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i have checked every thing 6/7 times, i know i must be missing something, 2/3 sets of springs 2 valve jobs, .663 comp cam (new) open 1.90 680 lbs closed 1.40 270 lbs 1.55 dia spring for clearance issues, no coil bind .100+ clearance custom pushrods adjuster screw right on t&d spec,lash .022/.024 always right on never loose or tight, season over now have all winter
have posted a few times
all parts are sold as is, all parts are considered used no warranties or returns
paypal/check/money order, shipping is from zip 02891, buyer pays paypal fees 24% IRS 1099A plus 3% of part price, check/money order preferred
site is not monitored 24/7 there might be a delay in response
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Re: GIVE UP T&D
[Re: BIGSPEED]
#1519457
10/20/13 10:58 AM
10/20/13 10:58 AM
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Joined: May 2005
Posts: 1,980
Apollo, PA.
B1MAXX
top fuel
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top fuel
Joined: May 2005
Posts: 1,980
Apollo, PA.
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Quote:
.100 plus clearance may be the problem coil bind should be set off of net lift at between .060 and .100.Bill C.
I agree.I learned this the hard way. You have to use "all" the spring as stated above. All I did was changge installed height never broke another rocker. I bet if you look at the face of the valve stem that they will have x patterens or shiny all the way around. This evidence of valve float and the "jack hamer effect". When the valve stem and rocker tip crash together the stress on the rocker is multiplied. Like a hammer hitting steel. 
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Now get to work finding out why your breaking them 
How close are your valve springs to coil bind? How much seat and open pressures are you running now? Which type of T&D rockers are you using, single shafts or paired rockers per shaft? Lots of gremlins out there 
