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T&D roller rocker, how long will they last ?

Posted By: brads70

T&D roller rocker, how long will they last ? - 11/28/14 03:39 PM

I have T&D roller rockers custom built on my 451" Mopar stage 6 heads. Just wondering how long they will last on a street motor? Anyone have experience with them durability wise?
Thanks Brad
Posted By: dvw

Re: T&D roller rocker, how long will they last ? - 11/28/14 03:55 PM

My friend runs them on his BB Chevy S/G car. Over 1" lift, over 1000lb's on the nose. They replaced the body's at 700 passes. Never had a failure. 185 passes on mine since I got them used with ?? passes.Spring pressure 320/810.
Doug
Posted By: Quicktree

Re: T&D roller rocker, how long will they last ? - 11/28/14 04:11 PM

my opinion on any valve train parts is how stable/correct is the entire system. wrong springs not enough pressure or to much pressure will kill any parts. when things are right parts will last a long time. just think about it, how many miles is 500 1/8 mile pasees. answer not many.
Posted By: Cab_Burge

Re: T&D roller rocker, how long will they last ? - 11/28/14 08:37 PM

Quote:

I have T&D roller rockers custom built on my 451" Mopar stage 6 heads. Just wondering how long they will last on a street motor? Anyone have experience with them durability wise?
Thanks Brad


It depends on how many RPM and what lift the valves have and type of lifter, flat tappet shifted at or below 7000 RPM should last a long time. I'm sure your crusing RPM will make a difference also, if ran at 4500 RPM for 10,000 miles will be a lot more cycles than the same milegae driven at 2700 RPM I put a set of harland Sharps on my old pump gas street Duster motor, I raced it more than I drove it on the street, I shifted it at 7000 RPM in each gear. I reshimmed the valve springs once and replace those springs after several years and never had a issue after replacing the adjusters with those rockers, they where the 1.6 ratio also . My motor had 250 lbs on the seats and 630 lbs opened on the solid roller cam. I stiffen the pressures up an the second set of valve springs(different brand) to 275 lbs on the seats and 680 lbs opened. Let us know the answers so we can hep you better with more information. I bought a set of the T&D for my bracket motor, I wasn't really impressed with them compared to the Harland sharps, they both had lift differences at the valves on the same cam About .030 differences checking with light springs between the most lif and least lift on the same lobes, probally worst with the good race valve springs
Posted By: brads70

Re: T&D roller rocker, how long will they last ? - 11/28/14 09:27 PM

It's a 90% street motor, valve lift .550, hyd roller cam , spends most of the time at 3000 or lower. Rev limiter set at 6000 I bounce it off the rev limiter now and then when playing.
This cam... http://www.lunatipower.com/CamSpecCard.aspx?partNumber=60312
Posted By: MR_P_BODY

Re: T&D roller rocker, how long will they last ? - 11/28/14 09:30 PM

Quote:

I have T&D roller rockers custom built on my 451" Mopar stage 6 heads. Just wondering how long they will last on a street motor? Anyone have experience with them durability wise?
Thanks Brad




I have them on all of my engines.. on the race stuff
I have at least 4 years on them turning 8200 rpm with
320# on seat and over 800 open.. I have them on my
street rod but I only have about 500 miles on it so
far.. thats with 260# on seat and 600# open(all solid
roller cams).. if you have to change the valve lash
you have problem parts... after the first recheck I
havent had to change lash at all(no more than .001
variance)
Posted By: Quicktree

Re: T&D roller rocker, how long will they last ? - 11/28/14 09:31 PM

I doubt you could ever wear them out at that level. my stock stroke 360 has a mild roller with indy rockers and i think it would run forever
Posted By: rickraw

Re: T&D roller rocker, how long will they last ? - 11/28/14 11:38 PM

I had one brake. 245-625. Guessing they were around 11 yrs old. I'd say age has a lot to do with breakage.
Posted By: Cab_Burge

Re: T&D roller rocker, how long will they last ? - 11/29/14 02:18 AM

You got them, use them and don't worry about them at all I forgot to point out the set of T&Ds I bought and used was the single shaft stock Mopar OEM replacement type, not the all out high dollar high RPM race two rockers to a single shaft set up. Sorry for not making that clear to start with
Posted By: BradH

Re: T&D roller rocker, how long will they last ? - 11/29/14 06:54 PM

There was a post on here not that long ago that had a link to some T&Ds w/ serious shaft wear. I think the assumption was that there were improperly heat-treated shafts supplied at one point, but nobody ever responded to the OP's question about whether this was an isolated case.
Posted By: brads70

Re: T&D roller rocker, how long will they last ? - 11/30/14 01:27 AM

Thanks for all the replies guys! I had read that aluminum rockers don't last very well and was a little concerned but figuring what they cost they better last awhile!

Posted By: 440Jim

Re: T&D roller rocker, how long will they last ? - 11/30/14 04:06 AM

IMO, those T&D individual paired rocker setup is one of the best available. Just as good as the similar Jesel, and perhaps oil better.

The single shaft T&D are not the same, but are still pretty good. But the shafts are totally different.

Attached picture 8346077-T&D_installed_a.jpg
Posted By: Al_Alguire

Re: T&D roller rocker, how long will they last ? - 11/30/14 06:23 PM

After using them for a number of years in a whole lot of engines we finally broke one this weekend.



Of course it took this to do it..

Posted By: Quicktree

Re: T&D roller rocker, how long will they last ? - 11/30/14 08:02 PM

thats not good, sorry to see that
Posted By: dvw

Re: T&D roller rocker, how long will they last ? - 11/30/14 09:05 PM

Al does this mean you exceeded the number of runs possible on your GRP's?
Doug
Posted By: Cab_Burge

Re: T&D roller rocker, how long will they last ? - 11/30/14 09:44 PM

Dang it Al, I'm really sorry to see that damage, hopefully no one or the car got hurt from that part failure
Posted By: Al_Alguire

Re: T&D roller rocker, how long will they last ? - 12/01/14 12:29 AM

Quote:

Al does this mean you exceeded the number of runs possible on your GRP's?
Doug




No those are steel rods out of the dragster. Just another reason I am not a steel rod fan. That engine is a complete write off. Well the water pump an intake survived...

This stuff came out of the motor


This stuff fell out with in pan
Posted By: Jerry Kathe

Re: T&D roller rocker, how long will they last ? - 12/01/14 01:54 AM

Sincerely sorry to see that, absolutely sucks……but wasn’t the following two quotes made by you in a “Charlies Oil Pan” thread earlier this year?

QUOTE “IMO it is a good pan for the money. We have used them in the past and they are WAY better than the Milodon stuff.”

QUOTE “Chris I ran that pan for years and NEVER ha d a leak. Also in reply to the no HP gain with the kickout I will call BS as well. We ran mine on the dyno when I first bought one. We made 23 more HP with the side kickout than we did with the milodon dragster style pan. So my experience is quit e a bit different than posted here. We have since moved on to a different pan builder. But I still feel this is one area many Mopar guys are missing the boat.”

I’m guessing by the silicone art, this was the bullet that came with your pipe rack, and not one of your pieces? Hopefully the frame wasn't damaged – one huge reason I wont run steel rods in mine – losing the engine would be bad enough, having to also back half the car would be catastrophic.

To the OP on the original topic - IMO, you cant really assign a timeline to these types of components, too many variables. Just keep up on the valve springs and perform good inspections, check for resistance with turning the adjuster screw and for any noticeable roughness in the bearing, in addition to discoloration of the main body (stress evidence).

FWIW, my pipe rack has a 17 year old 572 w/-13 heads, 1.7 ratio, 340 on the seat and 1100 on the nose, many laps on these T&D's and no failures. They very well may have been some of the first T&Ds that were ever produced for those heads. I think you will be happy.
Posted By: Al_Alguire

Re: T&D roller rocker, how long will they last ? - 12/01/14 02:46 AM

FWIW the bearings look new, almost to new honestly. Yes this motor came with the car. We had numerous issues with the the car from day one. Looking back we should have pulled it apart but figured it would last two races. Looked at log book today and it made 21 runs from the day we got it. Plan was to pull it apart after this race and freshen it up. Now it is total loss.

The damage did take out one body panel. Luckily it missed the frame rails. It will NOT have steel rods in it again IF we keep it. For now we need a complete motor and the kid is on a tight budget as this was to be his car.

Oh yeah don't have to worry about using that pan as it was destroyed along with everything else
Posted By: RT540

Re: T&D roller rocker, how long will they last ? - 12/01/14 10:43 AM

A friend of mine had a stock 440 block crack a cylinder that filled up with water and broke a rod. This was in third gear 727TF high rpm in the water box. Kicked out a piece of the block that got under one of the tires(16x32") which added speed to the piece of cast iron that hit one person standing some distance behind.
Lucky it was only a flesh wound and he did not break the arm.

I am in favor of alum. rods and use them myself in my motor, but this was a alum. rod that broke the side of the block just like Al´s block.
Really sorry and feel your pain Al.

Regarding this thread, as you have the 5/8 shafts, those rockers have much more meat in the right places, so if you don´t get in any bad harmonics, or use to soft springs, those rockers should stay in place for some time.
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