b20b vtec Compression Height?

kevin7200

New Member
First I would like to apologize for my bad English. I come from Denmark.
And i really need some help.

I am having big problems finding out what my compression is going to be on my Engien.. :/ I have tryed most of the Honda B-sereis Calulators on the internet. And they can not help me.
It is because i think i have gotten the wrong pistons from "cp"

My enginen is a b20b3 whit b16a Cyllinder head whit Oem head gasket.
And i have baught an Brian Crower 92mm Lw stroker kit
And i have ordered the Cp pistons so the compression should be 12.5,
if my head og blok is like stock and not milled

But there is certainly something wrong whit the pistons.
Because i had 12.5 i compreesion when it was 87mm stock stroke and running whit the old Cp pistons in my old setup. And over the deck the old pistons is 3-4mm taller then the new pistons.

So now i have to calulate how much compression the new pistons will give me so i can be 100% sure that the dealer i baugt the Pistons from can change them to the right pistons.


The Data sheet is:
Crank 92mm
Bore Diameter: 3.347
Clearance 0.0040
Piston gauge point 3.343
Compreesion height: 1.024
Intake valve Relief: -0.21
Exhaust valve Relief: -.150
Dome Height 0.063
And the rod size is 1.7710
and Main size: 2.1646
Ans Something called Rod C-to-c: 5.512
And Oem Head gasket.

And that is all the data i have from the sheet.

I really hope there is someone who will help me whit the calulations
 

Esotericimage

Taking an H-T break
Registered VIP
5+ Year Member
Well, since you have longer crank at 92mm, you cant use a stroker crank in a stock block. You need to get a block designed for that stroke.

The OEM 89mm crank is needed to use for your OEM block.

Theres nothing wrong with your pistons, You just didnt research the parts you needed correctly.

So now you need to return the 92mm crank and use an 89mm crank. The pistons will then be correct and give you your correct DECK HEIGHT


Youll need to find the CC on the pistons to use the calculator to come up with your ball park compression.




EDIT: 87mm stroke is for vtec engines.. 89mm stroke is for B18A/B and B20B/Z
 




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