Built Bottom End on Stock Head

[andyjt]

why do companies like Endyne make pistons for bores up to 86.5 then?
http://theoldone.com/components/pistons/index.html

and darton make sleeves with 86mm bores?
http://www.prostreetonline.com/pnsku/ds-400-180.asp
http://www.exospeed.com/category.php?id=301

and Crower makes a stroker kit specifically designed for an 87mm bore?
http://www.inlinefour.com/crowstrokkit.html


granted going that high is a huge stress on the motor, and you would certainly not use it as a daily, but there are options available to push b-series out into the 86 range for use as drag/track cars. I kinda assumed this was all common knowledge tho

wow! thanks for the links steve

[2nrsOfSpringfield]

UMR Racer, like I posed in your last thread, if your head is still good I would do a stock B20 with your head. If you do the B20b you can run your stock OBD2 ECU with no problems and if you get a B20z you just have to add 5psi to your fuel pressure with ether a stock type-R FPR or an after market one. The B20z will make more power than a GSR if you run a GSR head on it. The B20z is 9.6/1cr stock and by adding a GSR head you will bump the cr to around 10/1cr.

PS 86mm is no problem for a B series but not very streetable. It will pop the head gasket ever so often. 85mm is as big as I would go on a street car. Also 13/1cr is to much for pump gas but would be great with E85

[mike93hatch]

Im pretty sure even resleved 86 is too big.

nope...but it is best to start with a smaller bore so you have room to work with if something goes wrong. the little extra displacement is not worth it.