ls vtec vs b20 vtec?
08-01-2008, 02:31 AM
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Re: ls vtec vs b20 vtec?
Okay - from the standpoint of basic motor design -
The B20 has a more favorable bore/stroke combination for high RPM engines. It also has more displacement, which = more power, all else considered equal.
As for the bottom end, an LS crank, an Eagle crank, and basically any B-series crank will fit. No matter which crank you use, for N/A, it should be fully lightened, knifed, and balanced.
Further, because of the bore size, less dome is needed to get the same displacment on the B20. Not to mention the valves can be deshrouded much further with 3 mm more bore, so the airflow on the head becomes better....
How many more advantages would you like me to list?
The B20 has a more favorable bore/stroke combination for high RPM engines. It also has more displacement, which = more power, all else considered equal.
As for the bottom end, an LS crank, an Eagle crank, and basically any B-series crank will fit. No matter which crank you use, for N/A, it should be fully lightened, knifed, and balanced.
Further, because of the bore size, less dome is needed to get the same displacment on the B20. Not to mention the valves can be deshrouded much further with 3 mm more bore, so the airflow on the head becomes better....
How many more advantages would you like me to list?
well put good sir.....but yes.....B20vtec FTW
08-01-2008, 09:16 AM
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Re: ls vtec vs b20 vtec?
I had some older guy in a stingray vette say that same thing to me....until i told him that my TURBO is plenty of replacement for displacement....then he said he would just supercharge his and blah blah blah , so i told him wait, i thought you just said there is no replacement for displacement....now your talking about power adders..?? needless to say, he was flabbergasted, studdering words to have a comeback 
08-01-2008, 09:48 PM
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Re: ls vtec vs b20 vtec?
I had a stock-sleeved B20/VTEC (only a block guard) with a HX40 turbo handle 400 on ~18 psi @ 6800 RPM (pump gas)
only problem is boost kept climbing due to too small of a wastegate, so boost cut kept killing it at 6800...
Its like everyone sais... its all in the tune... My timing on race gas is usually about the same as some of the other tuners pump gas timing...
only problem is boost kept climbing due to too small of a wastegate, so boost cut kept killing it at 6800...
Its like everyone sais... its all in the tune... My timing on race gas is usually about the same as some of the other tuners pump gas timing...
