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Title: Stroker crank counterweight sizes Post by: modnrod on January 08, 2017, 11:56:15 am I'm plotting and scheming to get a 82mm or 84mm crank, Chev journal. Still (I've been plotting for QUITE a while)....... ::)
Anyway, it occurred to me that since I picked the rods to minimise clearancing in the case I might as well ask if anyone knows which brand/type/machinist/manufacturer has the "smallest" stroker. Eg, do you need more work on the case for a Scat compared to a DPR compared to a generic 4340? Are some counterweights significantly bigger on some brands and so affect piston clearance more than others? Just curious really. I have everything else I need, just the crank to go into the shed for when I have the time. Thank you. Dave Title: Re: Stroker crank counterweight sizes Post by: nicolas on January 14, 2017, 21:01:18 pm interesting question, but can't say for sure.
there are however different 'styles', plain bulky weights, more circular ones, knife edged ones,… interesting to know more about what is needed for what purpose. ;) Title: Re: Stroker crank counterweight sizes Post by: modnrod on January 15, 2017, 12:55:47 pm Hey Nicolas.
I don't need counterweights at all in my opinion really. The engine will mostly sit between 2500 - 4000, a highway car. Our highways last for hours, with only the occasional overtake to relieve the boredom, and it's unlikely to be revved past 6000. Good balancing is more important. But since it is probably impossible to get an 82mm or 84mm crank without counterweights, I thought some may be bigger and heftier than others. Just curious mostly, but where I live I can't just walk into a VW shop and compare, so thought I'd ask. Title: Re: Stroker crank counterweight sizes Post by: richie on January 15, 2017, 13:12:06 pm Hey Nicolas. I don't need counterweights at all in my opinion really. The engine will mostly sit between 2500 - 4000, a highway car. Our highways last for hours, with only the occasional overtake to relieve the boredom, and it's unlikely to be revved past 6000. Good balancing is more important. But since it is probably impossible to get an 82mm or 84mm crank without counterweights, I thought some may be bigger and heftier than others. Just curious mostly, but where I live I can't just walk into a VW shop and compare, so thought I'd ask. I am sure DPR would make you one without counterweights if that's what you wanted cheers Richie Title: Re: Stroker crank counterweight sizes Post by: Joel Mohr on January 15, 2017, 21:29:19 pm I had Jose make me an 84 with what I called "horse shoe" counterweights...I'll try and post a pic tomorrow....
Title: Re: Stroker crank counterweight sizes Post by: Joel Mohr on January 17, 2017, 01:35:43 am I had it in my Pro Gas motor, but bearings showed too much flex for 8,000...Type 4 center main, 11/32 dowels..for sale....300 US
Title: Re: Stroker crank counterweight sizes Post by: modnrod on January 19, 2017, 00:46:19 am Hey look at that! Better opposite piston clearance and lighter weight (I'm guessing? ???).
That's cool man, interesting design. |