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Old 09-13-2017, 11:10 PM   #1
71142volvo
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Default b20 flywheel options/alternatives

Hey Everyone,

My b20 is in the final steps of getting built: double 40's Weber sidedrafts, 279 cam, double springs, headwork, alum/steel timing gears, aluminum radiator, electric fan, header, T9 5spd tranny with a short shift kit.

The question is: who makes an aluminum flywheel or should I get the one I have lightened up? also, how light is too light?

Thanks
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Old 09-13-2017, 11:24 PM   #2
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6 or 8 bolt crank?
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Old 09-13-2017, 11:36 PM   #3
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Weight depends a LOT on intended use. Mine is a street car, went with 17lbs when I had mine lightened, really nice honestly. Has enough weight to be nice on the street, way happier to rev than the stock 24lb flywheel.

Also gotta know if it's 6-bolt or 8-bolt. If it's 8 you can use a B21/23/230 flywheel.
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Old 09-13-2017, 11:44 PM   #4
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Quote:
Originally Posted by gsellstr View Post
Weight depends a LOT on intended use. Mine is a street car, went with 17lbs when I had mine lightened, really nice honestly. Has enough weight to be nice on the street, way happier to rev than the stock 24lb flywheel.

Also gotta know if it's 6-bolt or 8-bolt. If it's 8 you can use a B21/23/230 flywheel.
I'd also like to hear what people are running and how they like it. I've got a spare that needs a surface anyway so I might just take it to work and see about milling some weight off.

Anyone know better places to take the weight from?
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Old 09-13-2017, 11:56 PM   #5
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I have a 15lbs flywheel in my car I like it..
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Old 09-14-2017, 12:12 AM   #6
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IPD used to sell lightened flywheels for B18/B20. The 6 bolt flywheel weighed ~16 lbs (20ish is stock) which is about right for a street driven car.

They took some material off from the outer edge , but left a nice radius. They also removed material from the back side.

Here's some pics for comparison.





This IPD flywheel had some additional holes drilled to lighten it. You can see how much material was removed if you compare it to a stock flywheel.



Aluminum is just too light for the street.

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Old 09-14-2017, 12:38 AM   #7
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Thanks hiperfauto and everyone!

It's an 8 bolt. What's the weight of a 230? Direct bolt on application?

Thanks!!
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Old 09-14-2017, 12:42 AM   #8
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b230 is 20lbs, Should bolt right up, I have notice the b20 flywheels are a bit thicker than the b230 flywheels

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Old 09-14-2017, 01:00 AM   #9
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Ok....so at 20lbs, am I better off putting mine on a diet to bring it down to 17-18lbs to keep it streetable?
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Old 09-14-2017, 01:14 AM   #10
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Depends on the weight. I actually grabbed a flat flywheel from a B23 (had free access), weighed in at 24lbs. I agree with everything hiperfauto mentioned.
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Old 09-14-2017, 01:49 AM   #11
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How about a nice steel flywheel???
About 13-14lbs..But steel not iron.
A deal at twice the price.
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Old 09-14-2017, 02:07 AM   #12
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Quote:
Originally Posted by John V, outside agitator View Post
How about a nice steel flywheel???
About 13-14lbs..But steel not iron.
A deal at twice the price.
The B20 ring gear is a bit wider, might require an additional bit-O-carving.
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Folks on here don't know a good deal when they see it.
how psi a stock can support?

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Old 09-14-2017, 02:27 AM   #13
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^I *think* that's only true of my earlier 6-bolt flywheels.

The 74-75 B20 8-bolt flywheel has a little more material forward of the ring gear and less on the engine side but everything stacks up in the same place (clutch face and starter ring gear) from the rear mounting face of crankshaft if that makes sense when compared to its SOHC cousin.

The dowel pins things used for the volvo multi-tool crank angle pickup can sometimes barely hit the back of the B20 engine when using the SOHC flex plate or flywheel on an 8-bolt crank in a B20. You may need to file//grind/remove them.

Otherwise, they seem to swap back and forth no issues 8-bolt to 8-bolt SOHC or OHV. About the same ~20lb-22lb lump of iron either way.

14-17lbs is drivable for the street. Aluminum probably really isn't for all practical purposes. Even the 911 guys who run really light stuff on the street don't usually go below 10lbs, even in lighter cars with 3.6L motors.
15-17lbs (depending on where you carve it away...I stayed closer to 17lbs and just trimmed the outer edge and re-drilled for a larger clutch that was easy on my foot/didn't beat me up in traffic). Drove nicely and didn't beat me up.
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Old 09-14-2017, 09:22 AM   #14
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You don't want to go too light. A billet steel flywheel is best.

What gearbox are you going to run and any clutch plans?
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Old 09-14-2017, 10:48 AM   #15
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Nothing special on the clutch or gearing....yet!
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Old 09-14-2017, 10:53 AM   #16
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I took my stock heavy 6-bolt flywheel by my favorite machine shop and they did basically what looks like the IPD lightened flywheel up above:



I think they charged me $20. They said they'd have also done it for a 12 pack of half decent beer. Reeeealy easy to toss it on a lathe and take off that low-hanging fruit on the outside edge. You could spend more time and take off more weight, but that is by far the biggest bang for your buck.

The engine feels so much more lively with a lighter flywheel on it. Takes a lot of the tractor out of it.
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Old 09-14-2017, 11:52 AM   #17
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HAH, wish it was that cheap when mine was done John. Only 1 shop in the area at the time that could also balance it, otherwise it was have 1 shop lighten, another balance, and setup charges for both. They did most of mine on the outer, same as yours, with a little on the backside as well.
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Old 09-14-2017, 11:56 AM   #18
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My shop swore that it wouldn't need to be rebalanced, since they didn't hit any of the balancing drill marks. I figured why not try it, it's perfectly fine spinning at 7, 7.5K rpm.
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Old 09-14-2017, 02:06 PM   #19
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TTV Racing and be done with it.
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Old 09-14-2017, 02:31 PM   #20
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Quote:
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TTV Racing and be done with it.
It's 8 bolt, no need to go across the ocean AND pay twice as much...

I have 'em and it can be in today's Priority Mail.
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Old 09-14-2017, 02:32 PM   #21
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Jelly - where'd you get the T9 trans?
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Old 09-14-2017, 04:27 PM   #22
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There were some balance marks on mine that they had to touch a little, plus they did the pressure plate with it. Granted that plate is gone now, but they did the flywheel solo, then bolted the plate, remaining weight adjusted on the plate.
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Old 09-14-2017, 07:08 PM   #23
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Quote:
Originally Posted by John V, outside agitator View Post
It's 8 bolt, no need to go across the ocean AND pay twice as much...

I have 'em and it can be in today's Priority Mail.
Just giving options as per the OP request. Why not post your price?
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Old 09-14-2017, 07:16 PM   #24
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Quote:
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Just giving options as per the OP request. Why not post your price?

He has the price already and is happy..Gonna send his so i can swap over the ring gear since that's so easy for me....

And...You know the price is about half.. and the postage is like 1/10.
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Old 09-18-2017, 12:22 AM   #25
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Curious what the price is John? Is it half of $50? If so, I'm in for one as well! Serious question actually, since I'm in the beginning stages of a build plan for the 140 as well.
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