How much can you shave the Beta 1 and 2 cylinder heads?



Compression gain VS octane needed?



I noticed the Beta 1 has 10.3 to 1 compression. And the Beta 2 has 10.0 to 1 compression. What is the difference? Combustion chamber cc? Block deck height the same?





Also, I hear of people saying to use Beta 2 "NON CVVT" long blocks with Beta 1 ecu, sensors, manifolds swapped on. So wouldn't a CVVT motor drop in exactly the same as a non cvvt? Assuming you are swapping out the cams for Beta 1 cams. Just asking because the cvvt engines are more plentiful, usually have less miles.

 

i could be wrong but i heard it was the other way around, ie put a beta2 non cvvt head on a beta1 block. The head comes with beta cams and apparently the combustion chamber is slightly better designed.

 

Shaving either head shouldn't warrant an increase in octane rating.



As for the swap, the cvvt beta II should drop right in, mounting wise, since it's very similar to the regular beta II.



There are 3 styles of beta II heads that I'm aware of. One that is very similar looking to the beta I. One that has the castings for cvvt but doesn't use it and then the actual cvvt model. If I'm not mistaken, beta I cams won't fit quite right in the beta II cvvt style heads.



I'd suggest getting a motor out of an 01 - 02 elantra to keep things simple.



I've also done the beta II head swap on a beta I block.