Billet Head

[NINJA]

@calum So correct me if I've got this wrong, but after reading the reviews from the PJME link, by swapping the head it will change the compression ratio's, alter the squish band and give better heat transfer over the stock head? Which equates to a higher compression ratio, thus giving more torque, more power and hopefully less detonation by reducing the heat build-up ???

[declan]

@ninja wouldn’t mind one for the dt

[Calum]

@ninja No it's not going to be a straight swap no mods.

My advice is, if you don't want to fannying around with jetting, I would stay well clear. But if you want to maximise the power band, then yeah, this is a treat!

Go for flat domed piston to close down the squishband, narrowing the powerband.

[NINJA]

@calum So head swap, re-jet and are there any others mods required on top of those ???

[Calum]

@ninja Base gasket. You'll need to get the squish to the desired dimensons

[NINJA]

@calum The thickness of head gasket will determine the correct height for the squish band I take it ???

[Calum]

@ninja since you will be using a flat top piston, you will be changing where tdc is in relation to the port tomings. You can use a thicker base gasket to alter this.

[NINJA]

@calum said in Billet Head:

@ninja No it's not going to be a straight swap no mods.

My advice is, if you don't want to fannying around with jetting, I would stay well clear. But if you want to maximise the power band, then yeah, this is a treat!

Go for flat domed piston to close down the squishband, narrowing the powerband.

Just to clarify should I go for a flat top or domed top piston/head set-up???

[Calum]

@ninja What are you after?

If you raise the compression, you potentially increase the horsepower, but over a narrower band.

You do lose torque mind you.

[NINJA]

@calum My preference would be for more pulling power in the low to mid range for faster acceleration, (Quicker 0-60 & 1/4 mile times), over more top end speed. I would not want to loose any torque, as I would guess that I would need more torque to achieve my goal above.

[Calum]

@ninja As a general rule of thumb, the greater the compression ratio the lower torque spread but the greater the peak power. I don't know the figures, but I'd look to go with a domed head.