EOI Group buy for forged pistons to suit VN-VP V6's

[MACE]

wow how many cc is that dish looks huge in them pics

Make for a good ashtray or a bit of boost

Beggars can't be choosers though, it least there is a cost effective option out there.

Hopefully they'll be more in.

 

[MACE]

Hi,
my forged pistons arrived today.. they are awesome value. strength in the right places etc. serious connecting pins. etc. etc. a couple of pictures attached. sorry that I got the only set precision had in stock. you snooze you lose lol.

cheers

torture,

Do you have a part number for those pistons handy?

Cheers,
Steve

 

[Immortality]

wow how many cc is that dish looks huge in them pics

Hey mate,

I think they are a 23cc dish so with the standard VN heads they give about a 9.5:1 CR (assuming they are the same pistons I enquired about).

 

[torture]

Hi,
Sorry about the slow response. The dish is 23.6cc but the pin height is 36.3 up from stock (35.5?) this makes for a pretty high c/r. with a deck height of .0 a head gasket of .050" bore of 3.840 and vn/r chamber of ~37cc these come in at ~10.2:1 good for the N/A race guys.

I have cut up a head to check the meat and have done a quick rework of the combustion chamber to gain 8cc's from it and turn it into a more open hemi chamber. In the morning I will cut this chamber also to check for remaining meat. I'm looking for a min of .200" remaining material in the chamber for strength. I will then make a jig to cut the chambers spot on with a hss cutter for the outline and hand blending and polishing to complete. Preliminary results give cr of 9.2:1 as I will be running a largish cam (cut from billet) and alky (metho/water) spray it's not to far off the mark.

The crown on these pistons also could be further machined in the dish, however I wouldn't advise removing any material from the squish area above the ring lands as the first ring is not *that* far down.

Steve, I'm guessing your looking for the mahle part number? The pistons are at the workshop so I'll have a look and get back to you on that.

cheers
Jay

 

[MACE]

Very impressive Jay!

I kind of figured that these pistons were brought in the country, for speedway/NA applications.

Mahle part number would be tops!

I suppose, for people on a budget, they still could be used in boosted apps if tweaked accordingly.

On another note, for people who want these pistons modded (smaller diameter) a local company below can do the work. Not sure on the price though

Special Piston Services » High performance Forged Pistons

They can also make forged pistons from scratch to suit, however they're around the $1400 mark.

Cheers,
Steve

 

[torture]

Hi,
Steve the part number on the box seems to be PHO38006040MMS there's a picture of the box tag in the below link, including the reworked head cut up. There's plenty of meat left in the chamber. I've made the chamber cutting tool and seems to work pretty good. Some pictures here. oh and "budget" is my middle name

cheers
Jay

 

[MACE]

After looking at those pics all I can say is top marks for the resourcefulness!!!

The only constructive feedback I can suggest is to blend the edge that they cutter has made as it's cut the chamber to reduce any hot spots

Oh and thanks for the part number too

Best Regards,
Steve