Does a vtec head really bump compression?
 

Ok well I've heard soo much of both ways so I finally want to set this straight. Does a vtec head on a non vtec sohc (mini me) raise compression or is this just a myth? And how much are we talking if it does indeed raise it?

Re:Does a vtec head really bump compression?
 

i looked into this a while back....im assuming you mean a vtec head on your y7. there wasnt much info about the y7, but when i compared the heads of that and a z6 online it seemed they had the same volume, so i would assume no difference

Re:Does a vtec head really bump compression?
 

This may help a bit: http://www.knology.net/~jediklc/D.htm

I don't know if you have seen this.
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Re:Does a vtec head really bump compression?
 

dont know about a y7 but it made hella diffierance on my a6.

Re:Does a vtec head really bump compression?
 

Yeah. I cant seem to get accurate info.

Yes I've seen that around. (Fellow soler wrote it). But I never really understood it. :( Im too dislexic to use that calc. lol And yes I'm considering a z6 or y8 on my y7. And isnt the only difference in y7 and y8 the vtec head? So wouldnt it not change much??? ???

Re:Does a vtec head really bump compression?
 

i think theres about a .4 diff between the two heads. y8 will raise it more.

Re:Does a vtec head really bump compression?
 

If that is true would that really affect the ability and ease of tune? .4 seems measley to me if thats the case.

Re:Does a vtec head really bump compression?
 

i doubt it but i dont kno for sure.ill be another minime swapthis weekend but it will be a6/y8 so well see...

Re:Does a vtec head really bump compression?
 

for the power increase cant beat the headswap. :p

Re:Does a vtec head really bump compression?
 

yup ;D