rs stamped inlets confusion

[leew88]

from what i cam gather the 182 came with stamped inpets which didnt quite fit 172 head

i have a set of rs stamped inlet from a 172 cup (cups i believe where mostly rs stamped)

so do the cups have a different rs stamped inlet than the 182 or is it the same?

reason i ask is i was going to send my ph1 inets of for matching but the rs stamped inlets are a better match

my cups injects have also covered circa 40k less too and they are still in the inlet

what works involved in fitting this rs stamped inlet on.my ph1 or would be better off whipping off the ph1 inlets for matching?

 

[AlexW]

Its only the upper that differs for 172/182, lowers are the same.

 

[Coops Mk1]

as above, you can fit the RS stamped lower to the phase 1 but you will still need the upper phase 1 with it

 

[Chip-mk1]

Only the 182 had the RS stamped ones, and as above, its just the lower that you need.

 

[-J-]

Only the 182 had the RS stamped ones, and as above, its just the lower that you need.

My cup had RS stamped ones... Sat in my garage currently.

 

[Chip-mk1]

My cup had RS stamped ones... Sat in my garage currently.

Yes sorry mate, was replying to AlexW, and I meant of the non cups.

 

[leew88]

i have everything cor the ph1 its still up and running

so the stamped lower from the cup will bolt straight onto the ph1 head?

any benefit in sending the ph1 uppers off for matching

 

[Coops Mk1]

yes will bolt straight to phase 1 head and upper, like for like replacement.

tbh if I was matching I would send both the phase 1 bits off and just sell the RS stamped one.

 

[Chip-mk1]

If you are matching the only advantage in the RS stamped ones is that less material needs to be taken out as they are better to start with.

 

[leew88]

i was looking at these as a alternative to matching since i had them anyhow

surely the ph1 upper will need to.be matched to the rs lower or theres going to be a hell of a bottle neck

and if im having one matched i might aswell do both

only other option is tying to fit the tb the rs upper

 

[Chip-mk1]

The normal upper generally lines up not too bad on the RS inlet lower, but if yours doesnt then yes you will need both matched.

 

[DaveDreads]

Yes sorry mate, was replying to AlexW, and I meant of the non cups.

My non cup 172 has them, I doubt any previous owners put them on,
everything on it was standard when I bought it.

 

[Chip-mk1]

My non cup 172 has them, I doubt any previous owners put them on,
everything on it was standard when I bought it.

Certainly not standard spec for that car, but it does appear from a few similar things on here that at the factory if they ran out of one thing they just used something else instead, lol.

 

[leew88]

its a 2003 onwards thing i believe so cups non cups then 182s

the rs uppers are a good match for sure but id have to have a spy at the ph1

 

[Chip-mk1]

its a 2003 onwards thing i believe so cups non cups then 182s

the rs uppers are a good match for sure but id have to have a spy at the ph1

They did the same with the bottom arms. Changed the specs on all cars to match cups.
didnt know they did the inlets too though.

 

[Snake182]

I removed my upper and lower inlets this evening, the lower inlet is RS stamped, and after measuring the port on the head and then the corresponding port on the manifold using a internal vernier caliper, I concluded that the ports on the lower inlet were around 1-2mm smaller all the way around the port than on the head and the casting is w**k, so there are gains to be had. I will be matching them tomorrow, obviously leaving the lower inlet ports ever so slightly smaller to avoid any steps facing the airflow

 

[Tigger]

My 2003 172 had the lower inlet RS stamped - doubt it was modified in any way it had 17k miles on it when I bought it in 2007