Is it 12:0:1, 12:5:1 etc? Need to know.
On my current pistons I have a 19.5 dome volume and with the stroke of the K24 I will be using this season...I would be at 16.7:1 with a 50cc chamber and an .030 gasket. I will be modifying the piston to get around somewhere betweeen 15 and 15.511248c said:Is it 12:0:1, 12:5:1 etc? Need to know.
Yeah, its kind of funny you mention all of that...you should contact the company that originally put my car together and explain it to their "tuner" cause he as no clue.jtuner77 said:19.5cc Dome Volume???I would hate to know how much that cylinder head has been reworked to get that kind of dome to fit in that head. It is pretty hard to get anymore then 14/1 static compression on a Stock K20a or k20a2 with a stock rod length, stock combustion chamber. You can have 16/1 is you want and I would love to be able to see inside your cylinder head so I could watch the flame front fizzle away and not burn any fuel, unless of course your running Methanol. Take a look at the piston I posted and take a good look at the Dome and see how sharp the peak is on it and then figure that by making more compression you have to widen that dome or peak so it will force the fuel to run away from the top of that peak and pool up in the exhaust and Intake reliefs and you will have one hell of a crappy fuel burn.....but hey that's just a theory that everyone that has any clue about physics would know.
With the same piston I mentioned earlier the compression ratio in the K20 was only 14:1...you can almost get that with shelf pistons. The head was reworked for airflow, not compression. It flowed 308 cfm @ 28 inches of H20. From what I understand that is a pretty decent number.jtuner77 said:So you have done some chamber work then?? How far is the piston in the hole at tdc??? .030 Compressed thickness???Because the stock k20a2 head is 50.7cc's and the type R is the same. The k20a3 and the k24 had a 53.5cc combustion chamber.
You also have to remember just because there has been modifications done to the head that allows you to make more compression doesn't mean the car is going to be able to make more horsepower. I have seen some heads in my day then have been reworked like mad and allowed some mad compression that ran piss poor do to fuel burn problems. Sometimes simplicity is the key to making power. I love to see people over-engineer stuff and it make as much as the guy next to him that has half of the money invested in his build.