The Stovebolt Site Forums The Shop Area The HiPo Shop 6V71 super, on a 235?

Hey all! I was just wondering, I may be thinking way over my head but I found 2 6v71 superchargers on a V12 Detroit diesel engine. I was wondering what would be involved in, and would it be worth installing on my 235? I have always been astounded with making something I've never seen and something that would be as bada** as a big ol' blown 235. I know I would have to get the bearing kit for gas engines, and make up my own intake manifold/bracket and carb mounts, but what else? Will it just blow the whole front end off my truck?

thanks!

Wouldn't it be easier to hang a turbo off the 235?

Why not swap it out with a Detroit like I did =D!!

Love the thought of that actually! lots of work I'd imagine

There would be a lot of fab work involved. Depending on how your engine is built, you may want to underdrive the blower a lot so that you're not building much power (so you don't blow the engine if it is stock), but then it would be just for looks.

If you want something with a lot of power, you'll need to get the motor built to withstand boost.

I don't think the hassle is worth it.

You'll twist the nose off the crankshaft trying to drive it, and a 6V71 blower will be WAAAYYY too big (too much air volume) to work right on a stovebolt engine. A blower for a 4-53 might be better suited to the engine size and the power output you're likely to need so the engine has half a chance of surviving. The physical size of a 4-53 will also be proportional to the stovebolt engine so the finished product won't look so grotesque.
Jerry

Do they make forged bottom ends for a 235? I like the idea, but I'm also an idiot.

Yes, the crankshaft is forged, at least on a 235, but it's also got only four main bearings, with the smallest one in the front. The intake ports are siamesed, and the breathing sucks like a Hoover upright vacuum cleaner, so forcing air through them under pressure probably makes some sense, but the connecting rods are long and spindly and subject to bending under the stress a blower engine would put on them. Does the phrase "lipstick on a pig" come to mind? It's sort of like cramming 10 pounds of "fertilizer" (to be forum friendly) in a 5-pound sack- - - -something's going to split, and the result will be a stinky mess!
Jerry

Good analogy. Yeah long rods and boost = boooooom! I vote for it!

As HotRod Lincoln pointed out, the Stovebolt rods are not what are ideal for this type of mod, but the GMC rods are, and can be swapped into the Stovebolt with little effort. Even though they do have just 4 mains, they have excellent bearing overlap between the journals and are a lot more rigid than people give them credit to be. A newer M90 Eaton blower might be a better alternative as they are much newer technology and less rotating mass and effort to spin. Unless your going after the nostalgia look.

Besides. 6-71 blowers were a bad design and never worked well for GM. Send them to me and I'll dispose of them for you. I'll even pay shipping to help you out like a fellow bolter should!