Stroking,balancing and Knife edging

[EugeneSentraSTI]

What is your reccomendations???

[180fan]

balancing and polishing are always a good choice. Stroking is good if you've got the cash to blow. Knife edging, I wouldn't recommend for a street driven car.

[dustyk]

What is exactly are you looking for by asking that question? All of the above are good to do if you are looking for more power from your engine but they all come at a cost. Stroking is usually done with an aftermarket crank (usually also with custom rods and pistons =$$$$$) and yes balancing and knife edging will also add some power/smoothness to your motor but also =$$$

So I guess if you have money to burn, go ahead and do all of the above with a complete rebuild. If you dont have money to burn and havent done much to your motor yet, i.e aftermarket turbo, etc etc etc, then you're better off spending your money on other stuff

[EugeneSentraSTI]

The thing is i have a crank thats stroked,knife edged and balanced and i have some bigger pistons, but i havent installed these parts yetAs im scared i might of made a misttake, my crank+flywheel+pressure plate and pulley weights the same as a standard crank.i didnt want them to knife edge it so much i wanted them to keep some meat left on the top!!! but they didnt,,

i already have decently ported head, with a set of 272 cams with a rev limit at 7700Rpm, cold air intake,50mm branch ,63mm exhaust pipe,,

Well im not sure but id really appreciate any tips you guys can give me on my project,

As im from south-africa and there is no real development on the sr20's were the only guys here who' really into the sr20,, everybody is only in golfs,toyotas and hondas!!!!!

[180fan]

Well don't worry about it too much. Personally I wouldn't have gotten the knife edge work done on the crank but since it's been done just go with it. Assembly of the bottom end isn't hard. Just take measurements well. Take very good measurements of the cranks journals and buy bearings accordingly if the machinist you took it to didn't order bearings for you already. Don't sweat it too much though, my first rebuild I had nightmares that the pistons would come flying through the drivetrain and that my project would have come to a fantastic halt but that didn't happen. Take your time with the build and don't let details fall through the cracks and you'll be fine.

[EugeneSentraSTI]

Cool , thats exactly what im worried about!!!,, why wouldnt you of done the knife edging, because of loss of torque?? well my flywheel is a standard cutted unit, so im thinking instead of replacing it with a ligter piece i should rather keep it to make up for the torque i lost on the knife edging,,

what do you think of arias pistons? i got a set and im going to run them on a bout 11-1 or 11.5-1 , id like to run the car with race feul on weekends,,??

[180fan]

Arias are good but I personally went with CP. Only thing I don't like too much is that with the CP's is that if you don't warm them up enough (as with most forged pistons) you can hear slap. Otherwise they're an excellent choice.

[EugeneSentraSTI]

o ok, what would you reccomend would you do on finishing assembly and running in?

[180fan]

define what you feel is finishing assembly. How long do you want this motor to last, etc.

[EugeneSentraSTI]

WELL I WNAT IT TO LAST AS LONG AS POSSIBLE,, THATS WHY IM GOING TO TRY AND ALWAYS RUN ON 100+ OCTANE , ITS STILL GOING TO BE USED DAILY,,

[180fan]

The bottom end can be built as you feel fit for the most part. Just don't lighten the rotating assembly too much if you're building for the street. The head though, I'd recommend sticking as close to oem as possible ie no bronze phosphor guides as they will wear the valves faster, a 3 angle valve job is as far as you should consider and even that will increase the services your motor will need much sooner. ie keep it stock and it'll last a lot longer than with mods. 100+ octane isn't necessary to keep the motor running well. Staying on top of the fluid changes and tune ups and it'll run well for a long time.

[EugeneSentraSTI]

atleast my head is already done, so im not going to go to hectic on the head its already flowed and engineered, thanks with the tip with the bronce guides,, i like to service my car atleast every 2 moths with synthetic oils like shell Plus,, so i do tend to look after it well, but what do you recommend in running in period

[EugeneSentraSTI]

well i truly hope the engine relly lasts long caus eit costed my almost as much as my car!!! so ill be running it with mineral oils for the first while,, about 1000-2000km and after that ill be going to fully syntehtic