rev.ronnie
Well-Known Member
Working on this right now. Thought it was kind of cool.
Balancing a Viper crankshaft
- Thread starter rev.ronnie
- Start date
Looks just like my shop....., and monkeys might fly out of my butt.....at any rate, awesome stuff, man.
rev.ronnie
Well-Known Member
Actually, being that the throws are evenly spaced every 72 degrees, the bobweight is still 50% reciprocating and 100% rotating
Meep-Meep
дворянин
That makes it easier. I just remember seeing those 90 deg offset ground V6 cranks and wondered if those had to have a bob weight on every rod journal - then thinking the Viper crank was similar.
rev.ronnie
Well-Known Member
Yes, the V6 cranks vary from 37.5% to 50% reciprocating. They are odd ducks. If you notice, one of the throws on this Viper crank has two V6 bobweights on it
I don't have 5 twin assembly weights, only 4 for V8's. They work the same. I've moved the pair around with no change.
Meep-Meep
дворянин
Yeah, I saw the center looked different.
Since we're taking cranks, have you ever built one of the old American V8's (MoPar, Ford, GM) with a flat plane crank? I was doing a little research and found out that the formula cars use flat plane cranks. The benefit is no counter weights, so lighter. Better firing order to take advantage of exhaust pulses and probably a few other things. Plus you get that very smooth exhaust note.
Since we're taking cranks, have you ever built one of the old American V8's (MoPar, Ford, GM) with a flat plane crank? I was doing a little research and found out that the formula cars use flat plane cranks. The benefit is no counter weights, so lighter. Better firing order to take advantage of exhaust pulses and probably a few other things. Plus you get that very smooth exhaust note.
rev.ronnie
Well-Known Member
I have seen a couple over the years, but never balanced one. Guys used to try them in Comp Eliminator as well. They would get them through GM and they just skipped the "twist" step after forging.
Meep-Meep
дворянин
I'm sort of surprised that technology made it's way to the old American V8's but HP is where you find it. Would be interesting to build a hemi or 440 with a flat plane crank. The sound alone would confuse people at car shows.
rev.ronnie
Well-Known Member
Oh, can you imagine? Put a gear drive in it just to really get people wondering. I'm actually using an old Pete Jackson on my Hemi.
Supershafts
Well-Known Member
Do you think it would make the same power, or just come apart from harmonic issues at those strokes, the issue i always knew was you gave up tq for rpm. ferrari and others use flat cranks but not near the size or stroke.
It would make a dual exhaust system everyone loves to have more efficient.
Ford played with them in the early 60's on some race cars, they left it alone after some time, i don't have any particulars why
It would make a dual exhaust system everyone loves to have more efficient.
Ford played with them in the early 60's on some race cars, they left it alone after some time, i don't have any particulars why
rev.ronnie
Well-Known Member
I think that Warren Johnsona and Smokey Yunick both abandoned the concept for the same reason. Not enough return for the effort.... If any return, at least in their application.
Supershafts
Well-Known Member
In some drag apps where you're playing with 290/320" i'd think that crank style has more to offer than the other since the area of power would be that high in the rpms where there is benefit to that style.
Didn't realize WJ and SY had played with them, though SY seems to have played with every possibility
Didn't realize WJ and SY had played with them, though SY seems to have played with every possibility
Meep-Meep
дворянин
The big advantage is no counterweights, so lighter rotating assy. Also you get a better firing order. Ever wonder why Porsche 911's sound different than other sixes? I never heard of anyone trying a flat plane crank on the typical American V8 but it's not surprising that those big names did. I still think it would be neat to match the visual of a 440 in a B body with a sound of a formula car. I guarantee you there would be some head scratching.
Supershafts
Well-Known Member
The counter weight loss is a plus, the flat layout is like running 2 4cyls, they fire so the true dual exhaust everyone wants would be something worthwhile now, that makes the sound.
I doubt it would sound like a formula 1 car though, a F-1 motor low in garage idle is 4k, and thats the low idle speed , a regular idle speed for F-1 is more around 6k/7k.
Fuel motors idle at 2500/3200
It would probably sound like a Ferrari
But if a exhaust system is done right, you'll get the same sound, i sold my PR and RR otherwise id make a video, but we had tuned the exhaust on both and not ran a true dual. True dual on our cars hurts rather than helps, and is simply added weight to carry around so joining the both banks by merges my PW and RR always had people wondering what they had since it sounded like no other mopar, once off idle they became high pitched and much like indy sounds.
. I wonder if most were abandoned from vibration issues, ford was playing with them in the 60's, but not much of what made them walk. I don't think flat styles are really to far into 3" strokes no sure how they would be beyond that, they do have some better packaging issues.
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I doubt it would sound like a formula 1 car though, a F-1 motor low in garage idle is 4k, and thats the low idle speed , a regular idle speed for F-1 is more around 6k/7k.
Fuel motors idle at 2500/3200
It would probably sound like a Ferrari
But if a exhaust system is done right, you'll get the same sound, i sold my PR and RR otherwise id make a video, but we had tuned the exhaust on both and not ran a true dual. True dual on our cars hurts rather than helps, and is simply added weight to carry around so joining the both banks by merges my PW and RR always had people wondering what they had since it sounded like no other mopar, once off idle they became high pitched and much like indy sounds.
. I wonder if most were abandoned from vibration issues, ford was playing with them in the 60's, but not much of what made them walk. I don't think flat styles are really to far into 3" strokes no sure how they would be beyond that, they do have some better packaging issues.
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rev.ronnie
Well-Known Member
Supershafts
Well-Known Member
5500 that was a steal
mopar12372
Well-Known Member
what would a person do with it ? only smokey knows
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