Anyone have an idea on how much compression a jdm ITR bottom end and a Gsr head that has been decked 2 times(no idea how much) will net?Also are Toda spec b's adequate for this setup??????

 

Not acounting for the head being decked, it will make about a 11.3:1 compression ratio (got that # from c-speedracing.com). Unless decking it will give you at least a 12:1 cr, than it will not be enough for Toda B's.

 

11.3 is fine for toda b's.

Will they like more? Of course.

I think your compresion will be more like 11.5:1 with a GSR head.

 

i'd say its appx. 11.7:1

block: 11.1
p72 head: add .2
mill: add .2 for every .010 milled

 

Lol, no offense, but why ask us? Do a compression test.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by H22A-AllMotor &raquo;</TD></TR><TR><TD CLASS="quote">Lol, no offense, but why ask us? Do a compression test.</TD></TR></TABLE>


compression test?? uhhh...you've got alot to learn. and you are "LOL" at him.......

(shaking head)

 

If you go to http://www.c-speedracing.com they have a compression ratio calculator thats really easy to use. The only thing is it doesn't account for milling, but if you can figure that out yourself than you are ahead of the game in that department. As far as the Toda B's, yes 11.3:1-11.5:-1 will be "fine", but those cams like a 12:1+ compression ratio. **** they have 11 mm of lift on the non-vtec lobes. With the compression you intend on running, I think Spec A's would be a little better or Skunk2 Stage 2's. You will definitely have a stronger powerband. In addition, I would much rather have too mild of a cam over too aggressive of a cam. I would also advise you to get a stronger timing belt if you do decide to go with the Spec B's.