im looking at a set of used pistons and cylinders for my 73t with s 2.4 mfi. im told the pistons and cyld.s are within specs. the place wants $350.00 for the set. is that a good price. i also found a site that has a set of new mahle pistons and cyl.s set for $1200.00 that sounds like a really good. any feedback on these options. im not rich, but if the piston/cyl. kit is a real deal, well id go for it.

 

Just an opinion, but if I were investing the total $$$ in a major engine rebuild, I'd spring for the brand new factory pistions/cylinders..... also if you are cracking the case, swallow hard and replace the oil pump....

$350 sounds like a steal for a complete P-C set... if they are perfect.

 

yeah, theres nothing like new. but im leaning towards the used ones for $350.00, i want the shop to give me a price on re-ring and honing the set, then ill see what the total comes to. im not planning on splitting the cases. i read an ariticle on replacing the cam tower oil feed fitting with a later year that restricts the oil, yet gives the cams more than enough oil, and suppose to boost the oil pressure at idle by at least 10psi. id like to get away with just doing the pistons/cyl/s and valve job. figured id replace the rod bearings. looks like it shouldnt be to hard to get to the bearings with the barrels off. it would be nice to have about $5000.00 to spend on doing the whole motor, but thats not going to happen.

 

I'm no expert, but I doubt whether you can do bottom end bearings of either type properly without splitting the case

 

In Europe even at porsche part discounters (www.mittelmotor.de) an original mahle 2.4S set is more than 2000 Euro (2400USD).
In the US a good alternative is to use the 85mm www.jepistons.com
pistons (new ca. 850USD a set) and to hone the cyl. to 85 mm.

Check the "specs" of the used piston/cyl. carefully!

I recently replaced my used 2.4S pist/cyl. The engine was running very well, lots of power...
but the pist/cyl. were completely out of specs (with up tp 0.2mm tolerance, ring gap 2mm)
Be careful to measure exactly there where the rings grind a groove in the cyl . walls.

Andreas

 

the place that i bought them from is called partwerks, they sell on ebay. the asure me the setup is in tolorances, but i wil check when i get them. there installing new rings on the pistons for me. all together the cost, with shipping, will be $500.00 that sounds like a good deal. when i get them ill mic the pistons and inside the barrels.

 

55-w..."in tolerance" could mean 95% worn.... suspicious me.... with all the money you end up putting into a good rebuild, it is not a good idea to cut corners.... good luck

 

the told me the original honing marks are still in the cyld.s ofcourse that doesnt mean anything, could of already been re-ringed once. but i have a dial bore gauge and mic.s so ill mic. everything. i also noticed a few posts on replacing the head studs. guess ill have to do that also. seems like good insurance. i dont really want to split the cases, but may, i thought that i could replace the rod bearings once the barrels were off. i know on a vw you can. guess it depends on how the rod journals look on if i split the cases. ive done alot of engines, outboard, jetski, and automotive, also a 924 engine, and never had any problems. im just alittle neverous about the 911. ofcourse ill do has much reshearch as i can. i understand theres a good to have for this.