Originally Posted by Dan71 (Post 82282)

Thanks Kev, Ill be looking at getting the 11:1 piston then.

Kenny, could you put me down for a 11:1 piston to suit the standard bore size. I do have a limit of about $200 AUS though but if Ive done my conversion correct I think I will just scrape in there. I will await further instruction from you on where to send money and when.
Thanks
Dan

Originally Posted by Kev (Post 82284)

Sorry to say Dan, 200 Oz money would not even buy you a JE piston never mind one of kenny's

http://cgi.ebay.com/ebaymotors/JE-PI...Q5fAccessories

http://cgi.ebay.com/ebaymotors/Wisec...Q5fAccessories

Originally Posted by Dan71 (Post 82315)

They sure look the goods! I really want to put my xt motor together with one of these, some head work and further tuning. But if they are US$270 I'm out of the game. I'm praying that they are one of the cheapest kits in years.

Thanks heaps for the gasket prices Kev. They are a bit more then I thought, but I can wear the extra even if I have to wait a few pays to get them, but if by some miracle these piston kits are US$150 I CANNOT miss out!

Dan

Originally Posted by Kev (Post 82300)

I think there must be some sort of miss understanding.

Kenny can correct me, I think his Raptor pistons are around US$270.00 mark + postage, I know he sold the first batch for US$200.00 but they were a one off special. Kenny's pistons have gap less rings which offer better sealing, that is something I am very interested in.

You will also need AUD$90 for a XT660 head gasket & AUD$60 for the base gasket.

I will be great if Kenny can sell the XT pistons for US$150 shipped, they would be the cheapest piston kit I have seen for years.

Difference between a 10:1 standard XT piston on the left & a 11:1 Raptor piston on the right. The XT piston is slightly concaved where the 11:1 has a raised dome.

http://i201.photobucket.com/albums/a...stonheight.jpg



http://i201.photobucket.com/albums/a...ptorpiston.jpg

Originally Posted by Kenny (Post 82617)

Here is a perfect example of how aftermarket pistons are incorrectly designed. Notice how the installed height of these 2 pistons is the same. The added compression comes from the addition of a dome. Both of these pistons sit too far down in the cylinder (.050"), when added to a gasket thickness of .028", it comes out to .078" piston to head clearance (we call it quench). My piston is .035" taller, which makes the piston to head clearance .043". This difference in quench makes for more mixture motion in the chamber as the piston reaches top dead center. This makes the engine less octane sensitive and more efficient. Another benefit is the taller deck height allows the same compression with less dome, which improves chamber shape for proper flame propagation, especially on higher compression engines.

Originally Posted by Dan71 (Post 82287)

Seems I better figure out how much the piston will cost me in OZ dollers or the missus will have me sleeping on the couch for ever.