CRACKD

If you improve on the combustion chambers you are able to run farily decent compression and boost on pump fuel, but I have no idea on the quality of your fuel other there so I can't comment on how much you can run. As far as the psi vs CR, i was told once that every point (0.1) of compression is worth approx 4 psi of boost.

I am looking for a dog box to suit R33 GTR, it should be in good condition I dont mind a used one as long as it is in good condition. I have a new OS Giken 5 Speed for sale PM or [email protected] Cheers

That is called no compression hate to be bearer of bad news

Doesnt sound good, sounds like the engine has seized due to lack of oil, does the engine turn over when you try and crank it and if so does it spin faster or slower than normal when starting

Guys, Im after one SR20 main cap for some R&D. PM me if you have one it must be in good condition and preferably not out of a blow up CRACKD

SOLD Pending Payment

Very nice looking. PM sent

$900 FIRM, I am willing to COD as long as the buyer pays freight and insurance

Okay, well I dont want this to turn into a heated discussion. From the impression I am getting people in Australia dont modify the combustion chambers other than polishing and radiusing the edges. Is it possible to run 9.5:1, 1.5 Bar and Optimax Extreme?

ProEngines: please do post some pics also what do you mean by modifications to the oil squiters?

Proengines: Thanks very much for your input. I have drawn up some other chambers as you mentioned, I didnt quite understand the one about the V8 Wedge engines so I will wait for a clarification. If you can let me know which of the combustion chambers will work the best. My engine specs are RB26, high comp (9.0-10.0:1) running 1.5 bar and pump fuel to make 500awkw which is approx 800bhp. Chamber images: 1. Totally removed squish inlet and exhaust 2. Reduced squish inlet and exhaust allowing flat top piston due to piston entering the chamber where the squish was removed 3. Reduced exhaust squish with a Edyne style piston I greatly appreciate your's and everyon elses opinion

BUMP

Amaru: i was never told that thanks, another tuner in the US Edyne reduces the size of the squish areas by around 150thou on both inlet and exhaust side and makes it up in the pistons

Thats okay, but after speaking to some of the big tuners over in the States and Japan they all state that they remove the squish zones and use a custom piston to suit hence the purpose of this post since they arent reluctant to release what combustion chamber/piston design they use that allows high compression (9.0-9.5:1) with a fair amount of boost (1.5Bar) on pump fuel. And before anyone says Japan has better fuel the US doesnt and they still seem able to do it

Shaun: That was my next questions and you beat me to it LOL.

Here is a rough graphical representation of what I aim to do once the chamber has been modified, another thing that i would like to look into is biasing the crown of the piston towards either the inlet or exhaust valves to increase efficency any comments are welcome.

Was your compression 8.7:1 after the chambers where modified?

BOOSTD: That is sort of what I aim to do but I want my combustion chamber to blen into where the squish/quensh pads are. I assume the reason your lag increased was due to a drop in compression. What was your final compression?

Im willing to offer you $200 where are you located?

Ive been reading alot on the internet about how the guys in the states and japan modify the combustion chambers on the RB26 a company in the US www.theoldone.com has gone one step further and had pistons made to suit the modified chamber. I just wanted to know what people do here in Australia for their HIPO RB26 heads assuming ever other aspect of the head has been addressed I was thinking of having the quench/squish pads removed to allow a circluar combustion chamber and then have a piston made that has the same shape as the chamber the size cronm of the piston would obviously be determined by the piston manafacturer to aquire the determined compression ratio. Am I on the wrong track here? CRACKD

You negotiable? I can get a complete bottom end from a wrecker for much less than that

Located in the city but i can meet you somewhere

Markk: PM recieved would rather sell the lot BUMP

The HKS Twin Power is brand new in the box and never used, recently purchased this from nengun. Reason for sale is that I now changing to a CDI Ignition System, Part Number 43001-AK001 The SplitFire coils are used with only 5000kms on them and purchased from spoolimports, these are to suit RB26 and RB25 series 1. Prices HKS Twin Power $550 SplitFire Coils $550 Will take $900 for the coils and ingiter. Location is Sydney and pickup is prefered. PM or [email protected] for more info