220 Cummins, Backdrop Exhaust Manifold

[doubleclutchinweasel]

Love it...

[1961H67]

The Jake project is done! Started engine  , powered them up , all working. Back to Body work on the Cab 

[mattb73lt]

Sweet, I just saw your video on FB. Nice work!!

[mechohaulic]

there are those who look at the mona lisa and see something nice ; looking at these pictures i see perfection. great job . the sound is something never to be duplicated by the new electronic junk of today. like the '60's muscle cars the engine sounds of the old truck engines can't be beat.

[1961H67]

Thank You! I can’t wait to get it all done and hear the Jake with the Backdrop Manifold ! 

[mrsmackpaul]

Thats a fantastic job your doing 

 

 

Paul 

[1961H67]

I was worried about finding Gaskets for the Jake Brake,, I got in touch with Tom Mahoney at Mahoney & Sons , he is very knowledgeable on the old Cummins, he got me a complete set of gaskets. I wanted the exact Jacobs's Green, ( Just to show them off ) Tom got in touch with Dave Pearman  of Jacobs ,, He gave us the Original color code ( Pantone 348 Green,which my local DuPont store mixed) ,, Many thanks to Both these guys for their interest  in my project ! 

[mattb73lt]

I dealt with Mahoney and Son almost twenty years ago when I put my Jake on. Tom was fantastic to deal with. He was able to get all the parts I needed to get it done, gaskets and a few internal parts I needed to swap out. What blew me a way, was that he loaned me the fixture to grind the rocker arms to accept the Jake. He didn't know me from Adam and mailed it to me!! Then, I got talking to him about adding a T590 turbo to it that came with it. He gave me his retired father's number in Florida to call about the details of doing it. I called him and had a lengthy conversation about adding the "Smoke Kit" to a 220, as he called it. I was fairly new to the hobby, then, and was so amazed they would help a total stranger out so willingly!

I did notice a slight difference in the castings of out two Model 20's, in the recess area between the two cylinders. Yours has a cast flange, where mine does not in that area and the electrical pickups are in different spots. They'll still do the same thing, though. 

[1961H67]

Yes ! Tom also offered me the fixture to grind my rockers! ( I didn’t need it because I used the rocker housing’s from my donor engine) He is a great Guy,, I had only talked to him once before. His Dad is still able to give advice! ( He’s 92 ) He told me the Model 20s were the same color as the engine when they came out new, like you have yours ,, I just like the Jake Green look. I see the difference in the housings . David Strickland has a set with “1963” on them,, I’m going to visit him tomorrow, I’ll look at the casting on them. I was Blessed too grow up around Old trucks , mostly Mack’s , and I’ve got to know Many Good people! 

[1961H67]

Matt , These were on Davids B73 ,, Dated 1963 ,, they look like yours , I can’t find a ser number or date on mine,, I have no idea when the first Model 20 was made. 

[mattb73lt]

Mine had that green paint on them, almost like Detroit Diesel color, but were painted over in what was close to a Cummins old gold color. When I did some test spots, I ended up with the color I painted it. It should probably be more of a hue like yours. But, it’s done now.

Did you get any more pictures of his trucks? I love that L cab B77 he has.

[1961H67]

Jakes are all on and working,,, back to work on body parts ! 

[mrsmackpaul]

Full steam ahead now, no more getting side tracked, we're all waiting on the edge of our seats chewing our finger nails 🤪

 

Paul

[1961H67]

Thanks for the encouragement! I have started it and  popped the jakes on after reving  it , definitely a different sound with the backdrop. I’ll try to stay focused on finishing the cab this summer. 

[mattb73lt]

Catching up to you with my exhaust system build. A few sections of pre-made exhaust pipe from Fleetpride should do it and one piece of flex pipe to make up an angle I can't get. Started it off with a stub I cut from the pipe that came with the engine, then an extended 45* bend to clear the transmission mount. The rest is pretty easy. I'll wrap about 2' in header wrap where it runs under the floor boards. Shouldn't be any interference with the cab floor or mounts from what I can see. This, some air lines and battery cables, then I'll be able to drop the cab and radiator on in about two weeks!!

[1961H67]

Looking really good, I think you will be good on clearance, I looks like the same angle I had mine when I set the cab to make sure it would clear.  I haven’t worked on mine in about 2 weeks. Hopefully I can get some time this week. I Can’t wait to hear the Backdrop in a pull , it’s been a long since I have heard one. 

[mattb73lt]

I posted this pic on someone else’s post. Oops! But any way, there’s tons of room and really no chance of interference with the cab. The cab sits a lot higher that I recall. I put a seat in it today and when I raise and lower it, the gearshift’s are a lot lower than a standard B cab. Almost as if I need extensions on them. 
Moving right along, though, and so much to hook up yet!!

[1961H67]

Yes it looks 3 or 4 inch’s higher then my LJ , But I think the wrap is a good idea anyway because it’s still closer to the floor then the routing of a center drop . A lot to hook up, but a Lot behind you also ! 

[mattb73lt]

It is about 4”s it seems. I never really thought there was such a difference between the two models.

[1961H67]

I may have set the cab on with no rubber mounts, thinking if it clears without, it should be even better with mounts,, but I still think the frame mounts are higher on the B73 , I’ve never compared a LT , but looking at the pictures I think they are higher also. I’ve found a lot of changes over the years in what I thought would be the same on L Cabs .