turbowrenchhead

I see the recesses now.

I have tons of o rings. My noss head doesn't have recesses

I would say anything over 11.5:1 is to much for 93 octane. My last setup had to be in the high 13's and I there was no physical damage to the pistons. I small chuck if metal broke off between the boost and intake but that was because I ported it too thin. The bike pulled really hard when it hit the power band. My experience last year says that a two stroke jetted properly can handle higher then 11.5:1

Stupid question, do the o rings go between the plates or under the acorns

In your opinion is my compression too high?

What is uccr?

These cylinders I have now are at 66mm and they won't have a long life on the bike. I think I'm going to get some bolts today. My Noss head doesn't have seperate o rings for each stud. Just the main o rings for the head to seal it off from the dome and atmosphere. There are only two studs that are outside the main o ring that are not going through the coolant chamber.

So the calculator was really close. Next question isn't 14.2:1 way to high for pump gas? My last combo was pretty much the same setup. The differences were the base gasket was a oem one and that measured .026 thick. The pistons were numara's. They also have a dome that looks identical to the wiseco's. I'm betting that my compression ratio was real close to this new setup. I didn't have any detonation or pinging issues with it last year.

I wonder if steel washers and a bit of silicone work.....

I tried just acorn nuts without washers, they leaked. There are some studs that the o rings don't seal off.

With the noss head that I run I have had some issues with the copper washers. I purchased vittos acorn nut kit. However they squish so much that they compress onto the studs. This makes for a very difficult head removal. Are there any disadvantages to running a head bolt with a flat flange? One can just use a lil silicone to seal the flange to the head to seal the coolant chamber. This would make a head removal much easier.

Base gasket is a .015 thickness

Measured my deck height, its .004. Makes sense because that is what I had shaved off the decks.

No, deck height is the distance the piston is away from the top of the deck. Depending on you base gasket, stroker crank, etc determines where you piston sits at TDC.

I did the liquid test. I can get 14cc's of oil into the chamber when the piston is at TDC. I tried this calculator but I don't know my exact deck height is. When I had the heads off it looked like a 0 deck height. With zero deck height I get a compression ratio of 14:1. My rule of thumb that the most compression you can run on pump gas is around 11.5:1. The combo is 66x54 bore/stroke with a .045 squish http://www.cbperformance.com/v/enginecalc.html

I did the liquid test. I can get 14cc's of oil into the chamber when the piston is at TDC. I have no idea how to convert that into a compression ratio. I looked online and they want a dome cc height and I have no idea what it is. Lil help here please.

I did the liquid test. I can get 14cc's of oil into the chamber when the piston is at TDC. I have no idea how to convert that into a compression ratio. I looked online and they want a dome cc height and I have no idea what it is. Lil help here please.

I can do the liquid test. I'm not sure how to covert that into a compression ratio. I raised the exhaust port 1.6mm. I brought my cylinder down with a thinner base gasket .010. My squish is at .045 with this combination.

66.25 is the max. You can have them sleeved

It's not useless. Over 150psi running 93 or less is risky

The intake is raised to the top of the tunnel.

I don't want to use an impact on the crank. It will over tighten the nut and the hammering can't be good for the crank.

Sqish is .045

How do I get a compression ratio from the measurement?

I sure hope so.