Second motor ive messed up!

[rockystar99]

I haven't had this car for a year get and I just started hearing knocking on the 2nd block. I have a genv on it. Am I being to hard on this car? I have proper oil, antifreeze. What can it be? Ive heard these are good motors to have.

[16MustangVet]

tune? mods? umm some more info would be outfvcking standing lol

[SgtMarshal]

maybe it has a smaller pulley than came on the car stock resulting in increased cylinder pressure to a level that made a piston break.

[rockystar99]

I have only the gen v blower, with overkill pcm, n* tb with lq4 maf. It's a stock pulley. 4in air intake.

[Fivefingerdeathpunch]

If you see sparkles on the dipstick, the motor is junk.

They are good engines but with flaws. One major one being spun rod bearings are a common failure.

You won't hear spark knock because the computer will pull timing to prevent it from killing itself. But if you are hearing an actual motor knock at idle or any rpm while just revving the motor, then it's likely the lower end that is bad.

[rockystar99]

Yeah it's the second I spun. The knock is getting louder. Can I just swap the crank or do I need the whole motor?

[SgtMarshal]

Just the bottom end. Don't bother changing the crank

[rockystar99]

So new bearings?

[BrandonHall10]

new/used short block.

[ADrugDealer]

Its a 3800, go to a junkyard and get another one. lol

[rockystar99]

Well I had trouble finding a blown 3800 I can find na ones though. Don't want to really do a top swap?

[SgtMarshal]

what's wrong with a top swap? an L36 bottom end is like half the cost of an actual L67. just put headers on it and you'll be fine.

[ADrugDealer]

It does have more compression which can spell trouble at high HP; however, for this small build, a top swap is just fine.

[rockystar99]

Well I would like to do more mods to it later down the road like built heads and such. But I have the old block still which I also spun so I was thinking having that crank machined and swapped in. And if there is any upgrades I can do them and there as well.

[Scottydoggs]

you got $2500 laying around? thats what a proper rebuild costs, so forget it, im sure 300 or so for a used engine is there tho,,,right?

[JamesIvey24]

such a familiar tune to me. don't waste your money at the machine shop, find another used motor.

[SgtMarshal]

It will be cheaper just to pick up another block. The machine work to properly repair a block is going to run like 2000

[Scottydoggs]

such a familiar tune to me. don't waste your money at the machine shop, find another used motor.

Fck-ing jimmy two times lol


thats two failed rebuilds, by a reputable shop too.

[rockystar99]

Okay got it Well looks like I gotta look for another block then.

[Scottydoggs]

if all you can find is a na engine you can take your heads lim and blower off the blown engine and bolt em on the na engine, add a set of headers and off you go. a tune would be needed too. but will run ok as is as long as you keep it out of deep boost. if you get kr.

my top swap needed a degree of timing removed to be kr free on a stock pulley. gen 5 blower you may need to pull two degrees.