I am rebuilding a D15B7. Would there be any benefit of running a D16Z6 crank pulley (for reliability)? Or should I stay with the B7 pulley. From what I can tell my B7 pulley in not dampened.
D15B7 Crank Pulley
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Woah, really? I found a rare single belt crank pulley off of an import D series the other month similar to bellow (but three rib):
My DOHC ZC is damped from factory but also has the AC and PS provisions, and this one is obviously not damped but a lot lighter without the extra sections.
Are you saying this is a big no no? I've searched before and never really gotten a solid conclusion.
'93 / '95 Del Sol Si - '95 DX Coupe - '98 Civic Hatch - '00 Accord EX F23 Manual
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If there isn't a specific reason to run another crank pulley, I would just run what was originally on the motor.
It was just an example pic. It's just a solid single belt crank pulley with no dampening. I'll take some pictures next time i get a chance.
'93 / '95 Del Sol Si - '95 DX Coupe - '98 Civic Hatch - '00 Accord EX F23 Manual
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2,280 Posts
I had a similar pulley to what you are describing. Came off a B2 I have here. Definitely toss a pic up when you get a chance. I'd like to check it out.
Supposedly it’s a big no-no to run an undampened pulley because of the premature wear that it can cause on the main bearings. However, from what I recall, some earlier D16A6’s didn’t come with a dampened crank pulley so I’m not sure how much truth there is to this. I know Bone said he trashed some bearings after 5-600 miles and I certainly believe that.
I’m just wondering if it has to do with how much load there is on the crank pulley? In other words, do accessories like AC and PS increase the amount of wear on the main bearings? Is it ok to use an undampened pulley if you’re only running the alternator?
The JRSC crank pulleys for the Y7 and Y8 were undampened...
I’m just wondering if it has to do with how much load there is on the crank pulley? In other words, do accessories like AC and PS increase the amount of wear on the main bearings? Is it ok to use an undampened pulley if you’re only running the alternator?
The JRSC crank pulleys for the Y7 and Y8 were undampened...
Yeah this is my train of thought...
Still keen to hear peoples experiences though.
Here's some pictures:
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Came off a single carb D13. Appears to be the same OD as the DOHC ZC, still need to check the ID and offset.
Considering the environment these D engines were originally intended to run in (commuter car type scenarios, and not racing environments) then if the OEM determined a solid pulley design coupled with the provided internal engine components for the engine was good enough for the intended purpose, then I don't think anyone can knock that thought process. Honda puts a lot of thought into their engines for this kind of stuff. I can see the lack of a dampener being a thing for engines that don't run PS or AC in stock conditions, where simply having an alternator in place would place a smaller harmonic distortion load needing to be absorbed by the crankshaft. All powered belt driven accessories provide their own harmonic distortions to the crankshaft in their own way that clash with the engine harmonics. The belt may absorb some of it, but belts were never intended to be harmonic dampeners.
Now, for modded engines that will see redline frequently and/or higher than stock changes in rate of speed, then it would be wise to provide some source of harmonic dampening, for the sake of the crankshaft and main/rod bearings, especially if there are going to be multiple belt driven loads along with the increase in power. Your crank and bearings will thank you for it.
Without something to dampen those sudden and frequent onset vibrations in beyond-stock conditions, the consequences of no dampening will tend to show themselves sooner than later (fractured crankshafts, shattered bearings, etc.). The crank can only deal with so much harmonic energy before it breaks, and most of what it can handle is being forced upon it by the engine internals themselves, and bearings already have enough stress to deal with by themselves as it is. Let alone having to absorb more frequent and rapid blows in the form of harmonics from multiple powered accessories.
My $0.02
Now, for modded engines that will see redline frequently and/or higher than stock changes in rate of speed, then it would be wise to provide some source of harmonic dampening, for the sake of the crankshaft and main/rod bearings, especially if there are going to be multiple belt driven loads along with the increase in power. Your crank and bearings will thank you for it.
Without something to dampen those sudden and frequent onset vibrations in beyond-stock conditions, the consequences of no dampening will tend to show themselves sooner than later (fractured crankshafts, shattered bearings, etc.). The crank can only deal with so much harmonic energy before it breaks, and most of what it can handle is being forced upon it by the engine internals themselves, and bearings already have enough stress to deal with by themselves as it is. Let alone having to absorb more frequent and rapid blows in the form of harmonics from multiple powered accessories.
My $0.02
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