NoRice4u2Day said:
i saw a vid of a 91 civic hatchback lsvtec 2.0 and it ran a 12.6... thats hella fast for a non turboed civic... anyone know anytihng about what he did? at hdmmotorsports.com his name is hector. what whp do you think hes putting at the wheels?
91 hatches are LIGHT. You know how a lot of drag racers like to use EG's because they are substantially lighter than EK's? Well, the 91's are in that realm.
2.0 Liter LS VTEC would equal a bored out LS block, which is the same as a CRV block. 84 mm both. So the LS got overbored by 3 mm.
Why didn't they just use a B20 block to begin with? Well...they probably had the LS block sitting around, and or they wanted people to read the plate on there and see B18B, so they would get hustled.
Now as for "What could be so expensive about a frankenstien motor?!!!"
Ok...The B20 is basically a B18B with 3 mm larger bore, which means there are thinner cylinder walls. What's wrong with that? Well, take an engine making anywhere from 230-250 whp in order to produce your 12.6 timeslip, that is a lot of extra stress on the cylinder walls. Most likely, they are running something along the lines of s2s2 cams (aggressive cams). That means it's rev'ed out to 9000+ RPM. That's where the problem comes in. 8000 RPM vs 9000 RPM = 10X more stress on the cylinder walls. That's basically daring the motor to break on you. Soooo...to remedy that, one would look into SLEEVING. That alone will cost you around a grand.
A stock VTEC head will bottle neck at about 8500 RPM. Port work. Upgraded valve train. Expect another 1500 right there. Oh ya, the cams. 500.
We still haven't even talked about the connecting rods and pistons yet. Labor associated with the build. FUEL MANAGEMENT! Don't expect to get far using the stock 240 cc fuel injectors. Sooo much more good stuff to consider. Tuning?
