Je pistons

[Chris Wilson]

Just 2 quick thoughts. 5/16 rod bolts are inadequate for a long stroke engine, so those rods with the thin bolts should be avoided. 3/8 minimum!

Running a thick gasket to change compression is bad news, you lose the ultra important squish band. The piston bowl is where compression ratio changs should occur, or in the head chamber volume. With decent rods you should be able to run a good piston protruding into the gasket itself. Squish makes vast difference to det avoidance on biggish bore cylinders.

[Klaus]

Originally Posted by [b

Quote[/b] (Nathan @ Jan. 14 2004,14:09)]

I am very surprised to hear that Chris. I would lay money down that they were, as are the TODA's. In fact, they look like every other forged piston I have seen, including Cosworth and Accralite. TODA and HKS shown...



As for Cosworth being honourable, yes, they are. Very. Shame more companies don't take the same trading policies ?

Hi Natan
What is the part# of the HKS piston shown ?
It does NOT seem to be the 2103-RT028 - or ?
The 2103-RT028 has a flat top vs the one shown having a "bed shape like" top !
To my knowledge only the pistons for the new 3,4L Stroker Kit has theese kind of pistons (Piston p#: 21003-AT001)
Thanks, Klaus

[Nathan]

I have cleared this up with Klaus via phone- Martin- the HKS pistons above are from their 2.2 kit for the SW20 so scrap that data as well. This whole stroker thing we are working on has thrown all the data out that I posted. Sorry chaps.

Chris; thanks for your concerns on the bolts. As for the gasket, I agree, losing squish is NOT the best option but at only 0.4mm over standard it's a decision we took and we're sure will be the right one considering the options. If you are concerned about squish maybe you had better inform everyone who is using HKS pistons on the stock stroke 2JZ. They have a flat top and run down the bore with no bowl whatsoever...

Mind you HKS are also the ones running 5/16 rod bolts aren't they....? Maybe they need some direction on their piston and rod design...

[Martin F]

Just come across some pics of the HKS 3.4L stroker kit.

HKS 3.4L Stroker

Wonder how long till we see one of these in the UK

[Martin F]

Thread back from the dead.

I've noticed that Crower are starting to supply Titanium rods for the 2JZ (INFO).
Obviously this will have a profound affect to the rotational mass but would there be any down side to using these rods ? (apart from the light wallet of course )

[Martin F]

So nobody has an opinion on Titanium rods ?

[wez]

Originally Posted by [b

Quote[/b] (Martin F @ Aug. 29 2004,22:37)]Thread back from the dead.

I've noticed that Crower are starting to supply Titanium rods for the 2JZ (INFO).
Obviously this will have a profound affect to the rotational mass but would there be any down side to using these rods ? (apart from the light wallet of course )

They sound pretty good

[Syed Shah]

That Fabio bloke is using them for his ultra-HP 2JZ app, so they must be good. Just over half the weight of stockers. Wonder how they will hold up with so much power though?

[Nathan]

Sounds good to me- the NSX had titanium rods as OE so there doesn't seem to be a long-term reliability issue with the material either.

Edit: I might add that the NSX engine wasn't exactly pushing the boundaries of power output though...

[Chris Wilson]

Originally Posted by [b

Quote[/b] (Martin F @ Sep. 01 2004,12:06)]So nobody has an opinion on Titanium rods ?

Total overkill on a long stroke, slow revving road car engine. NSX used them to seem trick, IMO, but it does turn a fair amount of revs. Really high revving race engine stuff, much better things to spend money on. F3 engines sometimes run tit rods, and they are very long stroke, but it's so competive with different makes of engine within a couple of BHP of one another that savings in roational inertia become one of the few ways of trying to eek out an advantage. But we are talking 40K engines here.