Quote:
Originally Posted by MANDALAY
Puretone , was told our blocks are plenty strong  So as the crankshaft.
But to balance and knife edge . I just remembered i have a Ferrari video showing them making an engine and shows it really well.
See if the bottom end is all forged , trimetallic bearings ACL why lower the compression, more boost , but thats not what im after.
Why not have 11:1 and only 13 psi
Also if we only talk about rods given all Hbeam the price can varry as much as $1,000.
Yes the eagles are at the bottom end , made in china, but why the difference , marketing or really there is a difference
Also some builders say to rebore the new block to 86.5
and get appropriate pistons , why , does it really beed to be done ?
Thats why im asking so many questions |
I don't get why they would rebore a brand new block....if anything match up pistons to the new block, especially if it's right from the factory. I suppose maybe because they don't like the finish of the factory, and would rather hone the new block for reassurance & then match the pistons...I guess it's a bunch of honing they would do to go to 86.5mm.
I would watch out with 11:1 compression ratio & 13psi. Unless you have some seriously good rods & pistons. A seriously good tune would be required to keep things safe at that pressure. I know I know I know, diesels run at 20:1 or more....gasoline's a bit more volatile. I think you wanna watch what pistons you use, especially the ring lands tend to give up at higher boost.
Now if we have those under-piston oil sprayers to keep things cool it might be a lot safer. I know the Honda engines with those under-piston sprayers tend to do alot better with big turbos.
Just make for damn sure you get a really good tune on that compression ratio, knock can kill!
A lot of the time the knifing is also done to lighten things up and get quicker spin. Quicker rev ups etc....I am not so sure you would want this. Getting off the line from traffic light might get tougher especially with light flywheel. Engine will tend to stall easier.