Engine, cylinderhead tuning mods...

[tribetype40 0]

I would like to hear from anyone whos done extensive top end tuning to weigh up the effectiveness of the mods.

 

Considering a big valve head, ported polished etc and some cams.

 

There seem to be a few different profiles available so good to hear from people who have or have tried different set ups.

 

cheers,

 

Doug

[junkie 0]

What engine are you doing?

[tribetype40 0]

GOOD POINT! VR6

[Kevin Bacon 5]

I have a VR6 head with 1mm oversize valves, with the exhaust valves being made of inconel. Heavy duty springs, titanium retainers, 3 angle valve cut, port matched intake etc etc.

 

If your engine is naturally aspirated and of the stock capacity, I wouldn't bother personally. It's only really worth doing on the VR6 when bore size is 83mm or larger and / or turbocharged.

 

I haven't fitted it yet, but I've been told by the machinist that both power and torque will increase uniformly.

[Supercharged 2]

Is that from CNC heads Kev? have they released the figures yet?

[Kevin Bacon 5]

Errr....no! Ask Yan, they don't bother responding to queries....but they seem to find the time to get their advert into lots of car mags though :roll:

 

And at £1250+VAT with standard valves, they can keep it.

 

With extrac capacity and/or turbos, it's all about cylinder filling and gasflowing is of no help. Bigger valves are more important than shiney port walls.

[Yandards 0]

Errr....no! Ask Yan, they don't bother responding to queries....but they seem to find the time to get their advert into lots of car mags though :roll:

 

And at £1250+VAT with standard valves, they can keep it.

 

With extrac capacity and/or turbos, it's all about cylinder filling and gasflowing is of no help. Bigger valves are more important than shiney port walls.

 

Still waiting on a reply to an e-mail, tried two different e-mail accounts too just to check their spam filter wasnt causing an issue.

 

Might have to resort to a phone call instead..

 

You got any flowbench figures for your new head Kev?

[Kevin Bacon 5]

I haven't, I'll ask Bill for them..... Any idea what the standard VR head is in terms of CFM, for reference?

[Yandards 0]

I haven't, I'll ask Bill for them..... Any idea what the standard VR head is in terms of CFM, for reference?

 

Nope I don't but the guy that did your head (Bill?) should have before and after ones hopefully.