172 or 182 manifold....Forged engine + ITB's

[Barron]

According to myth....

172 - Better for top end
182 - Better for mid-range

How reliable is this?

Looking at either manifold for a full forged itb'd engine with very peaky cams (should peak at 7800-8000rpm)

which would you go for? why?

Personally im thinking 182 manifold but would like some other opinions.

Carl

 

[mini-valver]

I'll be running a 172 on mine. Identical engine spec from what it sounds.

 

[Gray]

172 manifold all the way

If your budget can stretch to it... Ceramic coat the manifold while its off the car?!

 

[sideways danny]

182 simply because of the huge heat concentration the 172 manifold gets at the collector

 

[172Ben]

182, especially if you have the engine out anyone. Only reason i didnt fit one to mine is it wasnt worth the cost of fitting really.

 

[Jonny1*2]

According to myth....

172 - Better for top end
182 - Better for mid-range

Carl

Isn't that purely to so with the exhaust system and final drive?

Presume you're talking about exhaust Mani?

 

[Fred@BTM]

either, not a huge issue

 

[LouisQ]

A 4-1 is generally more suited to a high revving engine which is why they are generally used on motorcycles.

A 4-2-1 will marginally increased low end power

 

[Andyman]

The difference is there but very subtle. I thought it pulled better mid and top end in my experience

Worth it if you can get it all done cheap. Very handy for cat messing too

 

[.GAZ.]

182 mani for me mate.

 

[the_prophet]

Very handy for cat messing too

good point

 

[en035]

for MOT time, 182 is a lot easier to handle

for the low-down torque again 182.