Cummins exhaust manifold cut to fit

**dzljon** · 11-03-2014, 10:59 PM

Cut this down to fit my 4bt cummins and tig welded with my 210ext

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**DaveO** · 11-04-2014, 12:38 AM

Just curious, how did you cut it, and did you have flush mating surfaces or did you have a gap? I've always heard that for cast iron you have to preheat and post heat carefully to avoid cracking. Same deal for you?

**dzljon** · 11-04-2014, 01:54 AM

I left a small gap chamfered both sides, cut it with a band saw and I did pre heat it and clamped it to the table till cooled to ambient temps

**zoama** · 11-04-2014, 03:10 AM

Very nice work. May we see the whole project ? I'm thinking about putting a 4bt in a ranger.

**dzljon** · 11-04-2014, 09:59 PM

Originally Posted by zoama

Very nice work. May we see the whole project ? I'm thinking about putting a 4bt in a ranger.

Yes sir! As it unfolds:-) the 4bt will be going in a 2000 jeep tj sport all parts (minus trans adapter) will be built in house and documented. Stay tuned for more.

also being built in house will be a long arm susension using ballistic fabrication coil over shocks

**zoama** · 11-04-2014, 10:48 PM

What filler metal did you use on the exhaust manifold ?

**dzljon** · 11-05-2014, 12:51 AM

Originally Posted by zoama

What filler metal did you use on the exhaust manifold ?

Er70s-2 seemed to work fine, no cracking occured

**dzljon** · 11-05-2014, 12:58 AM

A little more progress, reshaping the ports

**zoama** · 11-05-2014, 02:57 AM

Why did you choose this exhaust manifold and how much power do you plan to make ?

**everlastsupport** · 11-05-2014, 03:52 PM

Originally Posted by dzljon

Er70s-2 seemed to work fine, no cracking occured

We use it a lot without any issues. We have 316 (TIG) and 308 (MIG), but rarely use it.

**dzljon** · 11-05-2014, 08:36 PM

Originally Posted by zoama

Why did you choose this exhaust manifold and how much power do you plan to make ?

I chose this manifold because I already had it and no body I know if has tried it so it made for an easy choice I am looking to get 175 hp 370 tq that should be plenty but I an going to compound this with a hx30 in the future

**TheGary** · 11-06-2014, 05:05 PM

Originally Posted by dzljon

I chose this manifold because I already had it and no body I know if has tried it so it made for an easy choice I am looking to get 175 hp 370 tq that should be plenty but I an going to compound this with a hx30 in the future

That amount of power should be fairly easy to get with a 4 BT. If you have an inline pump it will be very easy, with a rotary pump it will be a little harder but not much. a 3000 rpm ask a set of 4 215 injectors from a 6 BT , a larger exhaust ,an BHAF and you would be there.