Hypereutectic pistons

[Lyle's GTP]

Does any body know if their are hypereutectic pistons and total seal rings available for the 94' DOHC. If so, who makes them and how much "bling-bling" am I looking at?

Lyle

[Juglenaut]

Here ya go>>>

http://www.beckracing.com/

Add to end for direct specs page>>>/slvpg24.htm

They should be able to custom make Hyper pistions for the 3.4L otherwise a standard but better than stock pistons are in stock I believe

[sd_iconoclast]

I just bought speed pro hypereutectic pistons. I bought six H684cp pistons and one H813cp pistons just so I can CC then and tell everyone what they are really like. It does appear to me that they are identical except for compression height. This would make the H684cp the higher compression piston.
They were $26 each (I think) from Summit. That was a lot less than anyone else wanted for them. Someone had told me that they had ordered them from Summit and had to cancel because Summit was taking so long. Mine took about two weeks to get here.

[Lyle's GTP]

Do you know what the compression will be?

Lyle

[sd_iconoclast]

Actually, I do not know what the compression will be. Speed Pro's tech support is absolutely no help. I bought one of each so that I can CC both of them and let everyone know exactly what theri effect on compression is. Now I just need to find a burette. I have called around and cannot find one.

[Lyle's GTP]

A burette?

Lyle

[sd_iconoclast]

A burette is la big glass tube with markings on the side (usually in CCs). It has a a valve on the bottom to let out fluid. The volume of cylinder heads, valve reliefs etc. can be measured by draining fluid from the burette into the volume to be measured until it is full. The volume is then the difference in measurements on the burette. Burettes are generally used for making precise measurements of liquid chemicals.

[RidgeRunner]

No scientific supply places in your phone book?

[Lyle's GTP]

Got ya, Just wasn't framiliar with the term. Thanks for clarifying.

Lyle

[GPXSS]

I can either rent you mine, or sell you mine and I'll buy another one. I paid $30 for it at the local science hobby store. You can also find them on Ebay.


OR... you could send me 1 of each piston and I'll cc it for free.

[4spdz34]

so your just gunna cc the vavle reliefs?

[Ross96GTP]

Nah, you use a burrette to measure your deck height. You put the piston at top dead center. Then you fill the burrette with water to a certain volume. Then you open the nozzle and let the water drain into the cylinder. When the cylinder is full of water, you close the valve, not the level of the water. The difference can be converted into Cubic Centimeters and this gives you the air volume between the piston at TDC and the top of the block. Add that to your gasket height, and CC volume of your cylinder heads and along with your bore diameter and stroke length you calculate your compression ratio using a formula.
You also CC your head volume with a burette in the same way with both valves closed if needed.

[Guest]

you dont' even need to put water down in it. You can measure the piston to deck height and with a little geometry you can figure out how much volume is in the cylinder with the piston at the top.

Take into account the valve reliefs and how much they displace and bammo, instant compression ratio.

shaun