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I would be lying if I said I wasn't worried about the crank snout, I have one of Mark Remmel's billet cranks, Hopefully it holds up. I'll be using a distributor for the cam sync with a blank cap and a smart coil setup.
That should be a good crank, but RPM and snout loading for your belt tension will be the deciding factors.
What is your boost target and drive belt length?
The challenge of trying to control belt slip with belt tension vs. the ever-increasing resistance from the head unit will be a fight. It may be just fine if you have good wrap on both drive and driven pulleys with close idlers and a wide 10 rib belt.
There is always a cog or Gilmer setup that requires much less tension and snout loading and has zero slip. You can make them quiet by drilling air escape holes on the pulley tracks.
The cam sync should be fine. I am only seeing a degree or less of variance with a good melonized gear on my dual-sync. I am keeping an eye out for gear wear though, and I will possibly get one of the composite gears to put my mind at ease.
Watch out for rough gear teeth on your dual sync distributor drive gear. I had a few teeth that were really rough on the drive side where they had been dropped and dented in during manufacturing. I dressed those little high spots with a fine stone.
Last edited by Battenrunner; March 22nd, 2024 at 08:52 AM.
Belt length at this time is unknown but, it will be as short as possible. My plan is to mount the driven pulley directly above the crank pulley with only enough room to fit the tensioner. Belt wrap is a non issue as I can design in however much I want when I place the tensioner. I have talked to a couple sources (Brute Speed and Star machine) about the pulley stack prior to purchase and both confirmed that the alternator pulley should be behind the Crankshaft blower pulley....I'm with you though, I do have my doubts. As far as boost goes, The blower is completely maxed out to 62,300 RPM with the 7.8" and 3.85" pulley combo at 7500 RPM which should yield about 32psi. Unfortunately a cog drive is only possible with a F-1 or bigger blower....Bonus is that I can fit up to an F-2 in the bracket I build since it has the same mounting pattern. Thanks for the heads up on the distributor gear.
Last edited by gear head; March 25th, 2024 at 03:29 PM.
Arts and crafts day is done. The templates are set up for a 9.5" distance in crank and blower shaft centerlines, I'll probably add an idler pulley for good measure. Time to cut some wood (make a mess)and see how this all comes together.
First version of the mock up brackets are cut and fit...Final product will be 0.750" thick 6061. I will definitely be adding an Idler pulley opposite of the tensioner...I'm sure things will move around a bit before it's ready to transfer to aluminum. Hopefully I can get into SCL before the end of the week to pick up some 6061 round stock for the standoffs.
Standoffs are made from 1.125" diameter 6061 round stock...They are about 0.080" long to be faced in a lathe. The tensioner needs to be clocked up about 0.200" as it hits the crank pulley ever so slightly at the rest position. I think I may add some material to the top of both brackets to add another standoff.
Last edited by gear head; April 1st, 2024 at 01:29 PM.
Had to take a break and get a few side jobs done. Here is the V 2.0 bracket, running the shortest belt possible will give me a minimum of 260* of belt wrap. I have added another stand off, 2 tensioner locations, idler pulley and trimmed up the front bracket. I believe this is what I'll transfer to aluminum.
March 22nd, 2024, 05:00 AM
