A little update on my truck...

jdgleason · May 23, 2015

So, found out what caused our issue at DPC - a valve in my new pump hung open and the trans lost all pressure. That's why it wouldn't move... If the damn thing would have moved I would have sled pulled it lol.

It welded the OD clutches together, but everything else looked pretty decent. Oh, and the converter took it like a champ lol.

As for the rockers, 6 seemed to effected.

ncollins64 · May 23, 2015

Well atleast it wasn't anything too serious. It still kicked some a$$ so be proud buddy

6 L chevy eater · May 23, 2015

SON OF A BITCH! theyre smoked! LOL

PrecisionEngine · May 24, 2015

Are those lines cracks on the rockers?

drunk on diesel · May 24, 2015

Did some pistons play kissy kiss with some valves?

NathannialD · May 24, 2015

Yes the rockers are all split/cracked. There shouldn't have been contact since the rocker arms deflected and cracked. I feel pretty confident they didn't contact considering I replaced a broken rocker arm on Jareds the day before and he as very large valve reliefs.

ncollins64 · May 24, 2015

I forgot but does jd have reliefs?

NathannialD · May 24, 2015

ncollins64 said:
I forgot but does jd have reliefs?

Unfortunately no, i wanted them even little tiny .020" just for a touch more clearance but it just wasn't able to happen in the time we had.

HOOV3R · May 24, 2015

Nathannial @ Elite said:
Yes the rockers are all split/cracked. There shouldn't have been contact since the rocker arms deflected and cracked. I feel pretty confident they didn't contact considering I replaced a broken rocker arm on Jareds the day before and he as very large valve reliefs.

So when are those HD rockers coming out?

oke:

Dzchey21 · May 24, 2015

how big are the valve springs? Im wondering if that 4600 rpm spurt wasnt a factor :doh:

drunk on diesel · May 24, 2015

that was my thinking... valve float or the valve being slammed into coil bind by inertia possibly

NathannialD · May 24, 2015

We've run the same springs over 5500 with no issue

Dzchey21 · May 24, 2015

something happened... you dont just break 6 rockers crusin down the street lol

Erikclaw · May 24, 2015

Just because they were in one truck before without issues doesn't mean there aren't any. I heard this reasoning before and don't buy it.

jdgleason · May 25, 2015

The rockers that were in it were 80k mile factory rockers and had been floated before on my stock motor...

I doubt it was just the rpm's that took them out, I'm assuming it was the violence of gaining and losing rpm with the pump freaking out.

The springs are some standard stage 1 springs. Nothing special.

Dzchey21 · May 25, 2015

mileage probably had more to do with it than anything.

jdgleason · May 25, 2015

Erikclaw said:
Just because they were in one truck before without issues doesn't mean there aren't any. I heard this reasoning before and don't buy it.

Lol these springs are in hundreds of trucks... With no issues. Idk what you're getting at, but my truck has nothing to do with it.

Dzchey21 said:
mileage probably had more to do with it than anything.

I think you're right. I should have mentioned that a few of the rockers that were effected, the clips were just broken. And the 3 worst rockers were the ones in the picture above ^. They cracked, but didn't break all the way through even, which doesn't seem to be the normal way they break. I replaced both sides because I thought it was time.

Just for a little reference, my truck doesn't run high boost or back pressure. On the Dyno at dpc when it made 1202, boost was 57 psi and back pressure was 69-70psi gauge.

Erikclaw · May 25, 2015

When did I say anything about the springs or anything about your truck? My comment has to do with Nethanial and his comment. I was told the same crap, those...... were in our truck and ran way harder and never had an issue. But when they came out of mine they were junk. The only reason I said anything is because their reasoning is bs. Just because it worked in one truck does not mean it works in all.

Fast-6.0 · May 25, 2015

Erikclaw said:
When did I say anything about the springs or anything about your truck? My comment has to do with Nethanial and his comment. I was told the same crap, those...... were in our truck and ran way harder and never had an issue. But when they came out of mine they were junk. The only reason I said anything is because their reasoning is bs. Just because it worked in one truck does not mean it works in all.

Boost and Backpressure are most likely the cause of failure IMO. The OE rocker just won't handle it. Been there done that. Jared's truck saw over 100 psi of bp, so did Erik's and big surprise they both broke rockers. I'm sure JD's bp was pretty high those last few drag passes.

The springs in JD's truck are the most the OE rocker can take. We've ran springs with greater force and they broke rockers. What Nathannial is referring to, is the springs will control valve float at 5500rpm, as we have tested that on a cam with substantially more lift and duration and faster lobe acceleration than any of the trucks that broke rockers. The spring wasn't the problem, the OE rocker is just junk metal and wasn't intended for the punishment.