Finally got a chance to pull my seized engine out and as soon as I got the pans off it became clear... oil pump, just like I (and most of us probably) thought.

Check out the pics below... cracked the casing in 4 places and shredded the teeth. In the 2nd pic those loose pieces off by themselves I found in the strainer..

 

 

What were you pushing for rev's? On a side note that engine appears to have low miles or have been well taken care of.

 

Kev I only see 3 cracks on that one...

KRRZ350: the engine had somewhere around 115k miles on it, it had lived on quality synthetic its entire life AFAIK. I was usually revving only to 7300-7500 but did hit higher a few times. It just fatigued I think, because it didn't actually fail at that high of a rev, I was around 4000-5000 during a burnout when it seized.

 

oh wow what a bad one. This is new to me to seea VQ oil pump go out like that (or to go out at all for that matter) nice pictures tho! lol

 

i cant see the pictars!...

 

Sorry.. fixed it (I think)

 

works now.. +1 on the clean engine.. So what is you next enine set up going to be?

 

It has happened before with extended use with a really high rev limiter.

 

I wonder what my beat 233k mile oil pump looks like :-x

 

To get me through this season, a DEK out of an 01 with about 55k on it that I will modify a bit...

 

We better see a 12-second time slip

 

Cams in a DEK will put this guy in the 12s! Once he has set the bar impossibly high for everyone else, hes gonna move on to the 3.5 and do the same thing.

 

Clever Canadians... J/K

 

can you use a reved up oil pump?

 

I think the air in canada is ideal for maximas, for some odd reason.

 

Looks like some one needs a Rev up or HR oil pump?

Krismax blew his pump with a 8000rpm rev limit.

 

Tell me about it! I was so disappointed to be .007 away on that run before it seized...


BWAHAHA... you have discovered my evil master plan!
But I will need my secret weapon - Canadian "20% nitrous" air - to pull it off!

LOL. J/K... but in all seriousness, I am 100% sure I could have hit 12's with that engine on stock internals if it hadn't seized. I just figure now that since I have to swap in another engine I might as well tweak it a bit to increase my chances.

 

Damn. that oil pump exploded. Great to hear your still considering the 3.0 platform. I feel that there's still unchartered HP that can be have from the 3.0.

Are you going aggressive with cams or just dropping in the 3.5 one's?

 

I figured it was your oil pump. Time for a revup one.

 

The standard 3.5 oil pump would be fine.

 

Why do folks suggest the Revup pump over the stock 3.5 pump? I've heard it suggested before but don't know the reasoning.

 

My logic is since revup motors take higher revs easier, then the revup oil pump must be either equal if not superior to the stock VQ35 non-revup pump.

 

The revup oil pump has like 17% efficiency over the standard 3.5 oil pump, but would be overkill for a 3.0. The standard 3.5 oil pump is good for 7500+ RPM and has to provide oil for the VTC sprockets and the piston oil jets. Subtract the VTC's and the jets and it's clear that the standard 3.5 pump would be sufficient.

 

So in other words my logic is correct...stfu n00b lol

 

Want a scooby snack?

 

I haven't decided what I'm doing yet. I need to do some measuring and analysis first... it will depend on $$ also.

 

He went with a revup oil pump shimmed to raise the "pop-off" pressure.


Your dilemma is something I've though for a while now. Do oil pumps fail due to mechanical failures (the internals physically not being able to handle it) or due to insufficient flow at high revs due to design issues, thus starving itself and the rest of the motor? Maybe they cavitate and cause the oil to foam at excessive revs? I wish I knew the answer...

 

I'm voting for mechanical failure of the pump, but that's just my .02 cents.....



Mustang dohc failed oil-pump, on these engines they fail because of a weak powdered metal used in the gears, billet oil-pump gears take care of that. Please don't flame, I just thought that this was at least somewhat relevant to this thread.

 

Oh it was shimmed? Any more details on that (how much etc)? I didn't know that but I did realize he'd used the rev-up pump (which is why I deleted that part of the post).

But yeah, I'm wondering too about what failed. Cavitation could be a possibility, the resulting large pressure differentials behind the impeller teeth... Another thing is that crank torsional vibrations will only get worse with high rpm, resonant frequencies can become an issue and if one has a UDP that's not damped...? Or is it a mechanical issue (ie stresses/metal failure/fatigue simply related to the high speed)?

One thing I will say, that 3L pump casing seems thin/not rigid or reinforced enough to me... I'll be looking forward to comparing a rev-up pump in a few days.

 

No worries, it is.

Unless I'm mistaken though (small pic), it looks like the casing held together even though the innards 'sploded (how's that for a technical description lol), it looks a lot more rigid/reinforced than the VQ30.

 

Bump. Rev-up pump is now here... anybody want pics of it posted up?

 

...sure!

 

While you're at it, update us with your full progress. I know you were going to throw a DE-K in, but I don't know if you ever said whether you were going to put cams in or change anything else from your previous setup. So, fill us in

 

Pics of the guts? Sure...

 

Alrighty, so here's some pics. The casings are nearly identical and the rev up pump should fit right in place of the 3.0 pump (haven't put it in yet though).

The most noticeable difference is the depth of the inner/outer gears (by depth I mean thickness parallel to the axis of rotation - just look at the pics lol). The rev up gears are about 3 mm thicker. However, the tooth patterning is the same on both pumps.

I may shim the regulator yet before I put it in. Have to look up some info on that. BTW, the revup pump part number is 15010-AC700 in case anyone wants it.

 

Not much to update yet, progress has been slow due to other projects on the go with the house, doing work for local guys etc. I can tell you the DEK cams will be getting switched out though.

 

I guess it being thicker means that it can handle more stress at higher revs without with minimal failure. It sounds like there may be some tinkering to get it in and working.

 

Here are some pics of the #2 rod bearing that seized my DE engine (after the oil pump went). Always meant to post these but never got to it. Seeing as Neal posted his funky piston shots up today, I figured why not continue the engine carnage theme..

The other half was so bad I couldn't get the cap off the journal..

 

yyyyyiiiiikes....