boring heads??

[browndizzle]

was thinking about performance the other day and boring the heads came into mind...kinda new to dubs and their limits and was wondering if anyone knew if a 2.8L vr6 could be bored to maybe a 3L??? is this possible??

[Ben J]

you bore the block to increase displacement, not the head. But yeah, you can bore the vr6 block to as big as like 3.1L I believe, you then need bigger pistions and such, and unless you have a really heavily built engine the gains arent really worth it from what I've read. Porting the head and getting bigger valves and such to make it flow nicely gets some nice gains on a vr though supposedly, especially when combined with cams and exhaust and all that

[browndizzle]

yeah that one ha ha. do you know or know where i could find info on the gains n stuff of porting etc sortofbigbj? like any links or?

cheers,

simon.

[browndizzle]

dont worry, found some good info. thanks for the help though.

[The_Hawk]

dont worry, found some good info. thanks for the help though.

Got some links for us to have a look at??

[browndizzle]

Got some links for us to have a look at??

well to sum it up for you, a port n polish will get you around 13-16hp...like boring the block, in terms of "worth it", the power/$$$ isnt grreat at all unless you want to squeeze every last hp out of the n/a motor. i guess with everything done e.g. porting, boring, cam n exhaust etc you'll find a good response in power but yeah. ive come to the conclusion im gonna leave it and just go ahead with putting my peloquin in...now THATS a bang for your buck mod!!! haha

[Ben J]

take a search on the vortex in the 12v 2.8L section for porting, boring, head work etc, theres a lot in there. this link is pretty general but amazing if you havent rread it VWVortex.com - How to build a relatively inexpensive, reliable, powerful Vr6..

[browndizzle]

take a search on the vortex in the 12v 2.8L section for porting, boring, head work etc, theres a lot in there. this link is pretty general but amazing if you havent rread it VWVortex.com - How to build a relatively inexpensive, reliable, powerful Vr6..

thats a very good read i must say

[whiteVR6]

Ive had larger pistons fitted and the actually opening up of the bores took a really long time!! No-one really has the jigs here to machine out a 15 degree V6.
As for power gain, spend the money on a 24V conversions, better bang for buck

[whiteVR6]

Ive had larger pistons fitted and the actually opening up of the bores took a really long time!! No-one really has the jigs here to machine out a 15 degree V6.
As for power gain, spend the money on a 24V conversions, better bang for buck

[browndizzle]

in that thread linked above, when the guy talks about the 2.9 manifold and he talks about the problem with the 6th cylinder closest to the driver and slight affect on the 5th with flow and restriction...is that concerning the euro 2.9 or our 2.8's?

[schoona]

I'd say it would be common in both engines.
Unless the 2.9 Corrado throttle body lets in "THAT" much more air flow/velocity to compensate for it?

[browndizzle]

Ive had larger pistons fitted and the actually opening up of the bores took a really long time!! No-one really has the jigs here to machine out a 15 degree V6.
As for power gain, spend the money on a 24V conversions, better bang for buck

this conversion...do you know what exactly has to go into it or? power gains n costs? sounds very interesting

[schoona]

She knows exactly whats involved

[Ben J]

in that thread linked above, when the guy talks about the 2.9 manifold and he talks about the problem with the 6th cylinder closest to the driver and slight affect on the 5th with flow and restriction...is that concerning the euro 2.9 or our 2.8's?

its talking about the 2.9 i think, as the stock 2.8 manifolds dont have the "kink" that is then there when you cut them up. im 90% through making my own 2.9 clone, just need it welded back up now, just been too lazy to call around and find someone to do it. Kinda hard to explain what he means without pics and such, and im feeling lazy, but what he is talking about is the little narrow bit on the side where the oil filling cap thing is flowing into cylinder 6