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ST170 exhaust manifold on a Blacktop
Rena - 22/3/16 at 07:22 PM

Hi,

On my blacktop I have an exhaust manifold and silencer the previous owner built. I donīt really think he did a good job cause the pipes diameter are very thick and the silencer is 3", too much sound from it.
So, I need a new exhaust manifold which works better om my Blacktop. I donīt want to put too much money in this, so I have read itīs possible to use the exhaust manifold from a ST170 with some modifications.

My engines as standard, running R1 carbs and standard cams, but I will change cams next year. I will use the car on the road, not on a track.

Will the St170 and 2-2,5" silencer be good for my setup?

Thanks!

big_wasa - 22/3/16 at 08:07 PM

They are a 4-2-1 design so are tuned more for torque than top end. I havnt checked but I think they are equal length runners as well. My opinion is once modified they are as good as anything else a bloke in a shed can make and chirpy chirpy cheap cheap.

Got one sat here if your local for Ģ30. That's not much more than a laser cut flange.

Rena - 23/3/16 at 04:23 AM

quote:
Originally posted by big_wasa
They are a 4-2-1 design so are tuned more for torque than top end. I havnt checked but I think they are equal length runners as well. My opinion is once modified they are as good as anything else a bloke in a shed can make and chirpy chirpy cheap cheap.

Got one sat here if your local for Ģ30. That's not much more than a laser cut flange.


Sounds like it would be good for road use. I will give it a try and see if it fits in my car.

I live in Sweden

Rena - 29/3/16 at 03:56 PM

quote:
Originally posted by big_wasa
They are a 4-2-1 design so are tuned more for torque than top end. I havnt checked but I think they are equal length runners as well. My opinion is once modified they are as good as anything else a bloke in a shed can make and chirpy chirpy cheap cheap.

Got one sat here if your local for Ģ30. That's not much more than a laser cut flange.


Got it today but didn't fit as my engine mounts are just behind the manifold.
Could you maybe show a picture how you did with engine mounts in a seven with the st170 manifold?

Thanks!

Rena - 29/3/16 at 06:20 PM

quote:
Originally posted by big_wasa
They are a 4-2-1 design so are tuned more for torque than top end. I havnt checked but I think they are equal length runners as well. My opinion is once modified they are as good as anything else a bloke in a shed can make and chirpy chirpy cheap cheap.

Got one sat here if your local for Ģ30. That's not much more than a laser cut flange.


Got it today but didn't fit as my engine mounts are just behind the manifold.
Could you maybe show a picture how you did with engine mounts in a seven with the st170 manifold?

Thanks!

big_wasa - 3/4/16 at 06:27 PM

I can't find any pictures of mine.

But some one else's. You get the idea.

Rena - 4/4/16 at 06:54 AM

Thanks!

Rena - 12/4/16 at 07:47 AM

Changed plans - I tried to mount me manifold in my car yesterday. Before I fitted it I knew I have to make a new engine mount, no problems to do.
But, even with a new mount, the manifold was to close to the frame - no space for engine to move.
So, therefore, it will be a winterproject to fix this.

Now I have to fix my old exhaust and re-use the exhaust manifold but change from the big 3" silencer to a smaller one. Thatīs why I have a questions.
I got to 2" pipes coming from the exhaust manifold. I must connect them to a Y-pipe. Will it work to have both A and B pipe as 2" or is B-pipe to small?

I have found a Y-pipe with A & B 2" but also a version with A as 2" and B as 2,5".

Which will work best? I know itīs not the perfect solution but as always, no time before season starts.