This has probably been discussed before but when Isearched I didnt get a good answer. Everyone always talks about how it isnt safe and **** like that? I guess my ? is, if its done correctly, what are the chances of the engine blowing?

 

It is probably not very safe.......the doctors say LSVT's are ten times more likely to cause rectal cancer.


It is safe considering it is properly done. The details of properly building a LSVT can easily be found via the search button. Good luck with your project if you decide to do so...


[Modified by SLPR, 9:50 AM 8/22/2002]

 

B20vtec.com is a great site for info. Basically, your rod/stroke ratio with all B18s is in the 1.5 to 1 range, which isn't good. 1.75 to 1 is considered perfect, but higher than that works well too. The B16's r/s ratio is 1.74 to 1 and the 4g63's (2.0 Eclipse turbo engine) is 1.7 to 1, meaning that it"s no coincidence that they are such great motors. A high r/s ratio means you'll have more power on the top end but not as much torque as a lower r/s ratio engine, which has more torque down low, but it won't be safe to rev high without stronger components. Even you you do build a lower r/s ratio engine, it will not be as durable as a engine with better geometry. A good example of this is the **** load of POS 347 strokers people throw into their daily driven mustangs. They get pissed when they burn oil like saddam hussein and blow in 25,000 miles. The r/s ratio is so bad and the oil control goes to hell. The only reason the B18C1 and B18C5 can rev as high as they do in stock form is that with have cooling oil squirters, a block girdle, and stronger internals. Search for every variation of ls/vtec (b20vtec, b20/vtec, lsvtec, frankenstein, all that ****) and you'll probably find something good. Try searching archives posts also. Damn, I didn't mean to write this much....

 

Research and a good engine builder (and some $$) will get you a good, reliable LSVT.... what you have heard is mostly due to half-asses jobs or people that think they can slap it together themselves because they read it in a magazine.

The LS's R/S ratio is not exactly horrible... it's just not perfect like a B16 (almost) is. The LS r/s ratio is actually pretty close to a GSR... which is why the GSR has a crank girdle to stabalize it at high rpm.

Major downfalls of most LSVTs.... No crank girdle installed, stock rod bolts, bad machine work to the head, improperly sized oil lines, incorrectly chosen parts (non vtec oil/water pump) and using low compression pistons (LS pistons)

Do more research... you'll find info... search LSVT, LS/vtec, B20/vtec, CRVT, CR/vtec, lsvtec and crvtec.. and other possible combos.