I was wondering about doing the waterpump/alternator only belt routing without adding tons of idlers to the front of the Vortech junkyard engine so when I woke up in the dark this morning I looked up where the pulleys are on the engine as it sits in the truck. Run a straightedge from the idler at about 2 o’clock from the waterpump to the AC pulley and everything clears.
I’m not enraptured by the long unsupported run from the idler to the alternator mounted where the AC compressor is on the diagram, and I’m sure there might be some slippage when things get hot, but this is doable! As in things won’t get in the way of the belt and there is some wrap on the waterpump.
I looked this up on my phone and used the “optical straightedge” of holding my phone up to sight where the belt would run from the tensioner sitting above and to the right of the waterpump in this diagram. From how I looked there was clear space from the AC compressor pulley to the idler. I was so excited I got out of bed at 0600 and started downloading the image and composing this post. I then verified with a straightedge made from a folded piece of paper held against the image on my computer that there was clearance (but I’m still unhappy about that long unsupported belt run to my alternator placement). The good thing is I can move the alternator up and tight to the block to reduce the amount of unsupported run and still use the alternator as a tensioner in the system, or use the tensioner that’s already on the engine in the truck to do the same thing. I’m also not thrilled with using the tensioner from the idler, because that puts the most belt wrap on the idler and tensioner and the least on the drive and driven pulleys on the crank, waterpump, and alternator.
I’m still thinking about it, but at this point the routing is crank, waterpump, idler, and alternator doubling as the tensioner in the system. If I find something else out when I get an engine I’ll have something else to write a post about. Also, doing it like this also allows just using the alternator on its own tensioning a 2 pulley system, crank and alternator, should I get the fundage to install an electric waterpump.