engine question

[buckmasterjr]

hey folks

I got a question for you i just recently had my truck in to the dealer and got two new injectors on a 07 lbz and they say that my #4 has low compression so i probably have a cracked piston from stacked chips and what not.

my question is can you change a piston with out pulling the motor just to get it running while i build another motor to swap into it or do i need to pulll the motor and be down for awhile while i earn and build the other motor

 

[sweetdiesel]

how low is the compreesion?

your far better to pull the motor then even trying to mess around

better get building!

 

[Bryce418]

Like Simon said how bad is the compression. If it's just under 300ish it may be a bent rod. If it's much under 300 it's probably a hole in the piston and I have yet to see one not tear up the cylinder enough to at least need an overbore or sleeve.

 

[buckmasterjr]

they said it was at 25 so its quite a bit under 300 so get to building huh ok so whats a guy to do or put in it any info guys

 

[sweetdiesel]

Tear the motor out and down and go from there

I would order rods asap

 

[buckmasterjr]

ok so you would get rods and what kind of pistons ( cut coated )

this is going to be a daily driver trailer puller but i want it to haul when i want to play tooo esp (with the fords and dodges) just like fast is all i guess

 

[LBZ_Duramax]

What tuner were you running?

 

[buckmasterjr]

I was running a edge evo and a ts pressure box but i think next time its efi and and other goodies as can afford

 

[TeaBagger2006]

if the budgets tight just do rods and stock lly/lb7 pistons and maybe headstuds and key the oil pump and cam pulley

 

[buckmasterjr]

you see thats the thing money comes it just takes time if i build i want to build it right so i dont have to again i would love twin cps and twin turbos some day but i want the truck to last awhile to i dont do sled pulling as of now maybe later and just street drags and playing but i do pull trailers and stuff but im sure the more i do the more i want to dyno and race and stuff just not sure i have money and time right now