turbo

i have read on here guys using hx 35 turbos but there are a bunch of different ones thought maybe someone would know sizes to use

And how much fuel delivery? What pump are you using?

Most any HX35 you find will have the same turbine wheel (70mm in and 60mm out) so that's easy. You are right. There are a few different compressor wheels and covers. I would start with any of them that have a 65mm inlet (2.20 inches). The seven blade version would be optimum, but the eight blade will work fine too. Find the tightest turbine housing you can. I would even use the 12cm waste gate housing with the gate tied shut. The issue there is that you have to make an adapter plate between the exhaust manifold and the Holset turbo to convert from the T4 pattern on the manifold to the T3 pattern on the turbo. They offer these plates on Ebay if needed.

I have heard that an Air Research Turbine housing can be used on the Holset turbo by machining the I.D. of the Air Research housing. That would be a slick installation if it could be done. Use the same exhaust elbow to go through the hood. I haven't tried it, just heard about it.

How big did you make the injector orifices and how much fuel does your pump deliver?

The size of the turbine housing is stamped or cast into the housing. Typically on the outside near the foot where it bolts to the manifold or can be stamped just inside of the inlet. I think the 12cm wasted housing was very common on Dodge trucks with the 5.9 Cummins.

A used turbo will work fine as long as it is in good condition.

My question on the injector orifice size is important. If they are too big it won't run very good no matter what the turbo is. I would say a maximum of 4 holes with .020" orifices. It may have worked just fine with the 7080 injectors depending on the amount of fuel the pump is delivering. Be sure the injection pump timing is no more than 34 degrees if your conn rods are not heat treated.

Edited by O.P.S. Heads - 12 Mar 2014 at 3:12pm

7080 tips factory stock are .0148" I think.

7080-7580-old N6 with AC injectors should all be the same .0148" 4 hole tips. I don't think I ever saw an N5 with AC injectors, but if so, they were smaller holes and the Roosa pump had .290" plungers versus the N6 at .310" plungers and 2850 top rpm's.

If that's what they are you should be OK.

It ran real strong pull but that was it.

Head is still off I had it gone over 30 pound heavier springs heavier keepers,valve job and he cleaned the ports out some

If you have the rods hardened properly you will have no issues. Yes 32 degrees is safer. With hard rods you could run 35 - 36 degrees. Much more than that and it may not lug as well as it would from 32 - 34.

My buddy has a set of six for $165.00 each. You would need to use new bolts when you install them.

Think about it: If you have already folded a rod and you plan on making more power, you will probably fold more rods if you don't change something.

Edited by O.P.S. Heads - 12 Mar 2014 at 6:34pm

I meant the rods your buddy has are harden

I am interested in them and where could I get new bolts. 

In order for my Roosa fueled 426 to run right, I've got to be in the 40* range. Hardened rods are a must.