172 cylinder head

[u63af]

Guys just a quick question, whats the difference between a ph1 head and a ph2 head?
Cheers
Sandy

 

[BenR]

The only real difference is the exhaust ports, phs2/cup/182 heads all have smaller exhaust ports which flow approx 30% less

 

[Sean6545]

I think i am right in thinking that some ph1's didnt have vvt aswell.

 

[u63af]

I just bought a 172 ph 1 as a spare, so I assume if it doesnt have vvt then it wont run on my ph2

 

[BenR]

i've not seen a phs1 without vvt.

If you have a non vvt engine is more likely to have come off a laguna or espace.

 

[u63af]

So if they both have vvt, is it an upgrage to put the ph1 head on a ph2?

 

[Andyman]

The only real difference is the exhaust ports, phs2/cup/182 heads all have smaller exhaust ports which flow approx 30% less

Sounds a lot that - going by Renaults performance data stats, it dosent seem to make much of a difference in terms of figures but would it be a advantage for folk to have a ph1 172 head on their 182 etc or have the exhaust ports opened up a bit?


Always wondered if i did the right thing having a ph2 head ported and put on my ph1

 

[BenR]

The phs2's head is a diff casting and doesnt have the ex ports CNC'd like the phs1's.

Performance is not affected as the engine output is not at a level where the flow ratio becomes a hinderance.

You can have TOO much exhaust flow.

The phs2's ports are also different in their internal geometry so you cant really make a phs2 into a phs1 ex port as ALOT of material needs to be removed.

 

[u63af]

So would my car work with a ph2 head? I got a ph1 head as a spare.

 

[BenR]

yes.

 

[u63af]

Sorry that was meant to say would a ph1 head work on my ph 2 engine?
Cheers for the help

 

[BenR]

yes it will.