tsr pack A???

[paultownsend]

the tsr 'pack a' is a generic head. a good head  for the price. but a huge mark up. for those in the know. not alot of flow bench figures around for them.
jmr and jnl racing are both expert engineers that will provide flow figures. they are around the same price as tsr's units. yet with alot more hours gone into them. as well as the flow bench time. im going with jmr as this man really knows his stuff. and publically quotes his cfm figures

[VeeDubGTI16v]

the best head if you are looking for cfm figures is the cnc head, but its expensive!

[Horney]

F*ck me. Just looked up their big vlave head for mine and it's £1200 exchange and that doesn't even include the big valves themselves.

Add one of their custom camshafts and a final hand polish finish and the bill comes to £2070 incl VAT plus still needing the valves to go in the head.

nick

[VeeDubGTI16v]

actually we can use that site for the 8v 16v argument 


Std 16v inlet 117 cfm
Std 16v exh 91
ported inlet 142
ported exh 104
std 8v inlet 81
std 8v exh 60
ported inlet106
ported exh 77
ported big valve inlet 118
ported big valve exh 79

so the 16v inlet ports flow 44% better as standard, 34% better ported, and 20% better vs big valve 8v
and the 16v exhaust ports flow 51% better as standard, 35% better ported and 31% better vs big valve 8v

 

[Len]

No argument then! 

[Horney]

No argument then! 

Except when fitted in an oil tanker

nick

[Paul86S2]

the best head if you are looking for cfm figures is the cnc head, but its expensive!

Be careful with cnc's flow figures. They don't quote them in the same way as some other engineers.

Paul

[VeeDubGTI16v]

really? how so?

the 8v 16v comparison should be pretty acurate though as all that data was from the same flow bench, so even of its inaccurate, its proportionally inaccurate!

[Paul86S2]

really? how so?

the 8v 16v comparison should be pretty acurate though as all that data was from the same flow bench, so even of its inaccurate, its proportionally inaccurate!

Yes their figures should be ok as a comparison to other figures of their own.

They have used the wrong size bore adaptor in their tests (3.9 inches approx 100mm). You will find their max flow will go down when they use the correct sized bore adaptor.

Paul

[Len]

So Paul86S2 where is the best place to buy a flowed/big valve head from?