240D Turbo conversion build - Page 2 - PeachParts Mercedes-Benz Forum

ROLLGUY · #16 07-05-2011, 03:47 PM

Quote:

Originally Posted by panZZer

You could use the 621 intake and a rajay turbo like the kit from the 70's throw away the air door (throttle body) and weld in a aluminum elbow pointed at the compressor outlet.

It will be so much easier to lob off the end of a 617 manifold set (I already have).

DeliveryValve · #17 07-05-2011, 03:58 PM

Quote:

Originally Posted by ROLLGUY

It will be so much easier to lob off the end of a 617 manifold set (I already have).

I think panZZer is suggesting to use the long runner intake for better bottom end velocity and help with the turbo lag. I think those also can be found in w115 om615 engines.

The other thing to consider is the turbo size. I don't think the 617 turbo would be a good match. To large for the engine, although dropnosky is planning on using one, so he will know for sure. Perhaps if your going to the stock route, a KKK K26 would be better suited for it. Other then that, you'll need to look for a smaller turbo to match the 240 size.

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panZZer · #18 07-05-2011, 04:01 PM

Quote:

Originally Posted by DeliveryValve

I think panZZer is suggesting to use the long runner intake for better bottom end velocity and help with the turbo lag. I think those also can be found in w115 om615 engines.

The other thing to consider is the turbo size. I don't think the 617 turbo would be a good match. To large for the engine, although dropnosky is planning on using one, so he will know for sure. Perhaps if your going to the stock route, a KKK K26 would be better suited for it. Other then that, you'll need to look for a smaller turbo to match the 240 size.

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Exactly--the one pictured is the 621 intakes and the 240d ones are approx 3" shorter. Im still trying to get a aluminum welder to finish my 617 intake but dont know if a spool gun is worth the trouble, I know a Brit who says it will do but I cant weld like him.

47dodge · #19 07-05-2011, 07:06 PM

If you already have a mig welder, then try using harder al wire. I have done this without the spool gun. Teflon liner helps too. I do not have a teflon liner but it still works without it.

panZZer · #20 07-05-2011, 07:50 PM

Quote:

Originally Posted by 47dodge

If you already have a mig welder, then try using harder al wire. I have done this without the spool gun. Teflon liner helps too. I do not have a teflon liner but it still works without it.

Does it leave little splatter balls around the weld? so what shielding gas is required just running this harder wire--do you have a wire # that would swap out with 0.35 size? Thanks.

47dodge · #21 07-05-2011, 08:04 PM

er5356 .035, argon gas. I do get some splatter balls. There is a 4000 or so series wire that is to soft to push through, this will turn to spegetti in side. The 5356 is much stiffer. I must say my harbor freight welder just makes a mess with either wire, my hobart does fine with 5356. The other thing that helps is to wirebrush with a stainlees steel wirebrush about a half inch back on both sides of the area to be welded.

panZZer · #22 07-06-2011, 02:04 PM

Quote:

Originally Posted by 47dodge

er5356 .035, argon gas. I do get some splatter balls. There is a 4000 or so series wire that is to soft to push through, this will turn to spegetti in side. The 5356 is much stiffer. I must say my harbor freight welder just makes a mess with either wire, my hobart does fine with 5356. The other thing that helps is to wirebrush with a stainlees steel wirebrush about a half inch back on both sides of the area to be welded.

Thank you 47dodge, Im a 37GMC guy --wish fenders were as easy to find for mine as yours. You might have saved me a bunch of money, so you run straight argon ? damn i wish the 70# oxygen 30 argon would work, wouldn't have to get a different bottle. Yup them harbor freight wire welders aren't worth the trouble, i got a lincoln 110 that works good as long as the tip is swapped out and the liner is blown out regularly.

47dodge · #23 07-06-2011, 05:58 PM

Yes straight argon. Not sure what would happen with the co2/argon mix. By the way your wire feed speed is about double for al verses steel.

The Mercedes manifolds seem to be good metal, I used the existing runners and made a new plenum for my 240, and it welded nicely.

panZZer · #24 07-07-2011, 02:06 PM

Yes i have been keeping my eye out at a few metal scrapyards for just the right piece of 3.5" aluminum tube.
Rollguy--you could rig up a supplimental propane fuel supply a good bit cheaper that reworking an injection pump.

greazzer · #25 03-10-2016, 01:26 PM

Quote:

Originally Posted by panZZer

You could use the 621 intake and a rajay turbo like the kit from the 70's throw away the air door (throttle body) and weld in a aluminum elbow pointed at the compressor outlet.

This is an oldie, but not a goodie.

I can say to a 100% degree of certainty that you CANNOT USE a 621 intake in a W123. Period. It will sit way too high for the hood to close. How I know? I tried it as I initially found an intake on the cheaps. What a costly mistake. You will need a 615 intake to work with mod'd air inlet to max out the air.