ORIGINAL: Steve108
ORIGINAL: Frost_
1. Nobody uses boring to find performance, they do it to get the scratches out of the walls... The improvements are MINISCULE. A 350 at .030" only yields an extra 5 ci, just over a 1% increase in displacement.
2. Again, it isn't "because everyone else is doing it"
3. Your sleeve has a chrome or nickle coating, the sleeve itself is only made of brass... This coating gives the sleeve it's life; brass is entirely too soft... How do you guys intend to do this and leave the sleeve's layer of protection intact??
Look Frost, in number 1 and 2, your wrong. In formula racing
everything counts.
As far as porting and engine goes yes, go ahead. I have done it to all my RC engines and it can make a
noticable difference. This is when you match the size of all the openings to all thier counterparts. Notice I said match.
You want to be as exact as possible. Use calipers! Even if the exhaust manifold opening is bigger than that of the block there will be losses.
I doubt he confused the two but porting is a great and simple performance job. You can use a dremel for roughing and then use a small, fine file to finish is up.
Boring the engine block for a larger sleeve and piston is a good idea too - if you have some machining experience. You can't just do it with a twist bit and hand drill. You need access to a machine shop and some understanding of machining. Be very careful to let the block cool before measuring. It will expand slightly during the machining. Take frequent and presice measurements.
Good luck!
Wow I'm sorry, was this thread, "Engine
porting question ?" NO IT WASN'T.
In "formular" racing, why the hell would they bore their engines? Why not cast the cylinder to the RIGHT SIZE?? I can't speak for what's done over-the-pond, but here in the US if you are running a bored block it was to clean up scratches...
PROFESSIONAL racers don't recycle blocks and as such, they buy their stuff the right spec... WHY ON EARTH WOULD YOU BORE A $20,000 BLOCK that can be made WHATEVER SIZE YOU ASK FOR???? WHY would you ask for a precision piece to be made too small so you can bore it yourself??? ...especially considering the precision of your equipment VS. the OEMs...