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TD42 Pistons
Posted: Fri Dec 22, 2006 4:35 pm
by mickyd555
does anyone know what the difference in the pistons are between the turbo TD42 out of a GU and the N/A TD42. Pics of the two would be great but any info is appreciated.
Is there any other difference to the internals of these two engines?
Is there a better set of pistons to put in to get better performance?
Im replaceing a bent rod in mine and was wondering if i should change all the pistons at the same time.
Posted: Fri Dec 22, 2006 11:12 pm
by Woop
Not sure exactly what the differences are, but apparently early GQ TD42 pistons are the ones to use for Turbo'ing applications...
Nick
Re: TD42 Pistons
Posted: Fri Dec 22, 2006 11:13 pm
by bogged
mickyd555 wrote:Im replaceing a bent rod in mine and was wondering if i should change all the pistons at the same time.
while its apart you may as well replace the lot. rings, pistons, bearings, but not sure on diesels if you have to do the Sleeves when you do this shizzle.
how many klms on the donk now?
Re: TD42 Pistons
Posted: Sat Dec 23, 2006 6:52 am
by mickyd555
bogged wrote:mickyd555 wrote:Im replaceing a bent rod in mine and was wondering if i should change all the pistons at the same time.
while its apart you may as well replace the lot. rings, pistons, bearings, but not sure on diesels if you have to do the Sleeves when you do this shizzle.
how many klms on the donk now?
Why would i replace them if there is nothing wrong with them??
There is nothing wrong with the pistions in there at the moment so the only change will be if i can upgrade them. It wont be getting resleeved as the inside of the bore looks excellent. Im sort of on a budget too so i dont think i will be able to afford forged gear even though it would be nice.
175 000 on it now
Posted: Sat Dec 23, 2006 8:02 am
by badger
may i ask what sort of power you are chasing and what sort of setup to need stronger pistons in a td42.
aslong as the egt's dont get over 550 id highly doubt you would destroy a piston.
also what year motor is it. im lead to beleive the pistons are all relatively the same. but the is other differences in the later motors, like no oil squirters in the top end and lighter crank n rods
Posted: Sat Dec 23, 2006 9:04 am
by mickyd555
badger wrote:may i ask what sort of power you are chasing and what sort of setup to need stronger pistons in a td42.
aslong as the egt's dont get over 550 id highly doubt you would destroy a piston.
also what year motor is it. im lead to beleive the pistons are all relatively the same. but the is other differences in the later motors, like no oil squirters in the top end and lighter crank n rods
do you mean the later model engine as in post 93 model or later model as in turbo GU engine?
Posted: Sat Dec 23, 2006 10:07 am
by bogged
mickyd555 wrote:badger wrote:may i ask what sort of power you are chasing and what sort of setup to need stronger pistons in a td42.
aslong as the egt's dont get over 550 id highly doubt you would destroy a piston.
also what year motor is it. im lead to beleive the pistons are all relatively the same. but the is other differences in the later motors, like no oil squirters in the top end and lighter crank n rods
do you mean the later model engine as in post 93 model or later model as in turbo GU engine?
the pre 93 mods had the better pistons.
Posted: Sat Dec 23, 2006 2:06 pm
by Zac Zec
yeah there is a difference. turbo pistons have a bigger gungeon pin hence different rods as well
Posted: Sat Dec 23, 2006 3:02 pm
by GutSquisher Media
Posted: Sat Dec 23, 2006 3:30 pm
by mickyd555
thanks for that, in your last post there you list a few different rod no.'s. would you recomend changing all the rods to the 28mm pin? I assume its the early model part no.
im still unclear as to weather i need to try and track down pistons from an old engine or i can use the new ones from a turbo GU engine? or for that matter maybe an aftermarket set?
Posted: Sat Dec 23, 2006 3:36 pm
by mickyd555
bogged wrote:mickyd555 wrote:badger wrote:may i ask what sort of power you are chasing and what sort of setup to need stronger pistons in a td42.
aslong as the egt's dont get over 550 id highly doubt you would destroy a piston.
also what year motor is it. im lead to beleive the pistons are all relatively the same. but the is other differences in the later motors, like no oil squirters in the top end and lighter crank n rods
do you mean the later model engine as in post 93 model or later model as in turbo GU engine?
the pre 93 mods had the better pistons.
yep i know that, do i need to get these pistons, and do nissan still make them? or can i use a new set of pistons from a turbo GU engine?
keep the info coming guys, im not building this my self as i dont have the skills or knowlege (as if you didnt already know that), but i have a GU locked up in a workshop over the christmas break untill i can get the job finished which i need to make some decisions on. i also need it back before the australia day weekend for competition so i cant waste any time.
Posted: Sat Dec 23, 2006 4:39 pm
by marko
Ive run 25psi plus into a 95 gq. no probs. And they have the supposeably weaker pistons. And I thouhgt the gu had the 30mm gudgeon because I was going to but them into my engine but found out the gudgeon was bigger and you needed to change rods aswel. $250 a pop. So didn't end up doing it.Change one rod/piston and be done with it.