General Ported and Flowed

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General Ported and Flowed

chegers

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Joined
Oct 9, 2007
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59
Anyone know anywhere in the Milton Keynes area where i can get a head of a cinq ported and flowed.
Also what would a ball park figure for this be?

Regards
 

serin

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Sep 20, 2004
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I dunno of a place, but GSR sell them for about 250 quid ready done. According to them tho, the car needs a remap afterwards
 
Joined
Feb 3, 2006
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Port n flow is ok, but tripple cut valves are the most beneficial mod on a head.
Full head work averages at 550 quid.
 
Joined
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in laymans terms,

It smooths the air flow into the chamber.

smoother air flow = better performance

Tripple cut valve seats increases the amount of fuel/air mix that can enter the chamber by quite alot. It's a bit like having bigger valves in but more efficient.
 

cartledge_uk

F.I.R.E. power
Joined
Aug 26, 2007
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264
Location
Newbury
Tripple cut valve seats increases the amount of fuel/air mix that can enter the chamber by quite alot. It's a bit like having bigger valves in but more efficient.

Cutting the valve seat is different to an angle grind on the valve itself.

But yes, cutting the vlave seat right on the edge of the valve increases performance as you said by increase valve size, but decreases realiability. In one of my race cars, we had to re lap the valves every 3000-4000 miles with this.

The valve angle grid job smooths the transition of the flow of air from the intake to the combustion chamber, by smoothing the transition from the valve stem to the face. imagine it like a slide. the smoother the slide, the more curvature the faster you will go compared to a rough slide.

I have had a 7 angle grind done before, unless you are going for silly hp, then details like this can be overlooked, a 3 angle is a good option.
 
Joined
Feb 3, 2006
Messages
2,660
Location
Nottingham
Cutting the valve seat is different to an angle grind on the valve itself.

But yes, cutting the vlave seat right on the edge of the valve increases performance as you said by increase valve size, but decreases realiability. In one of my race cars, we had to re lap the valves every 3000-4000 miles with this.

The valve angle grid job smooths the transition of the flow of air from the intake to the combustion chamber, by smoothing the transition from the valve stem to the face. imagine it like a slide. the smoother the slide, the more curvature the faster you will go compared to a rough slide.

I have had a 7 angle grind done before, unless you are going for silly hp, then details like this can be overlooked, a 3 angle is a good option.

For longevity you can have wear resistant hard alloy valve inserts fitted.
 
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